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Hiraishi N, Gondo T, Shimada Y, Hayashi F. Effect of borate, fluoride and strontium ions on biomimetic nucleation of calcium phosphate studied using solid-state nuclear magnetic resonance and X-ray diffraction. Dent Mater 2024; 40:210-218. [PMID: 37977993 DOI: 10.1016/j.dental.2023.11.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2023] [Revised: 10/31/2023] [Accepted: 11/04/2023] [Indexed: 11/19/2023]
Abstract
OBJECTIVES Apatite minerals can have various anions and cations in their crystal structure in addition to phosphate ion (PO₄³⁻) and calcium ion (Ca2+). The aim of this study is to investigate effects of the borate, fluoride and strontium ions on biomimetic nucleation of calcium phosphate. METHODS Nano-crystalline hydroxyapatite (H-Ap) was obtained from a supersaturated buffered solution containing 4.12 mM HPO42- and 5.88 mM Ca2+ (H-Ap). Four additives were used in solid solution methods: (i) 0.588 mM F- (F-Ap), (ii) 5.88 mM Sr2+ (Sr-Ap), (iii) 4.12 mM BO33- (BO3-Ap), and (iv) a surface pre-reacted glass ionomer (S-PRG) filler eluate that contained 0.17 mM Sr2+, 0.588 mM F-, 11.1 mM BO33-- (SPRG-Ap). Apatite crystallization was investigated using a solid-state magic-angle spinning NMR spectroscopy and X-ray diffraction (XRD) with the Rietveld analysis. RESULTS A 2D 1H-31P heteronuclear-correlation NMR showed F- ion incorporation in the apatite structure of the F-Ap and SPRG-Ap. The peaks on the 31P axis of the F-Ap, Sr-Ap, and BO3-Ap were different from that of the H-Ap, and the full width at half maximum increased in the following order: H-Ap∼F-Ap∼BO3-Ap< SPRG-Ap< Sr-Ap, suggesting the incorporation of the F-, Sr2+ and BO33-. The incorporation of F and BO3 was further confirmed by 19F and 11B NMR. The XRD revealed that Sr2+ was preferentially incorporated into the CaII site. SIGNIFICANCE The F-, Sr2+ and BO33-ions might be involved in modifying the crystallization of apatite precipitation, producing a variety of apatite. S-PRG filler that release these ions may have an effect on remineralization, i.e., the reformation of apatite lost due to caries.
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Affiliation(s)
- Noriko Hiraishi
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan.
| | - Tadamu Gondo
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Yasushi Shimada
- Department of Cariology and Operative Dentistry, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Fumiaki Hayashi
- NMR Operation Team, Laboratory for Advanced NMR Application and Development, RIKEN Center for Biosystems Dynamics Research, Yokohama, Japan
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Timpel J, Klinghammer S, Riemenschneider L, Ibarlucea B, Cuniberti G, Hannig C, Sterzenbach T. Sensors for in situ monitoring of oral and dental health parameters in saliva. Clin Oral Investig 2023; 27:5719-5736. [PMID: 37698630 PMCID: PMC10560166 DOI: 10.1007/s00784-023-05206-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Accepted: 08/11/2023] [Indexed: 09/13/2023]
Abstract
OBJECTIVES The oral cavity is an easily accessible unique environment and open system which is influenced by the oral fluids, microbiota, and nutrition. Little is known about the kinetics and dynamics of metabolic processes at the intraoral surfaces. Real-time monitoring of salivary biomarkers, e.g., glucose, lactate, fluoride, calcium, phosphate, and pH with intraoral sensors is therefore of major interest. The aim of this review is to overview the existing literature for intraoral saliva sensors. MATERIALS AND METHODS A comprehensive literature search was performed to review the most relevant studies on intraoral saliva sensor technology. RESULTS There is limited literature about the in situ saliva monitoring of salivary biomarkers. Bioadhesion and biofouling processes at the intraoral surfaces limit the performances of the sensors. Real-time, long-term, and continuous intraoral measurement of salivary metabolites remains challenging and needs further investigation as only few well-functioning sensors have been developed until today. Until now, there is no sensor that measures reliably beyond hours for any analyte other than glucose. CONCLUSIONS Saliva's complex and dynamic structure as well as bioadhesion are key challenges and should be addressed in the future developments. Consequently, more studies that focus particularly on biofouling processes and interferential effects of the salivary matrix components on sensor surfaces are required. CLINICAL RELEVANCE By monitoring fluids in the oral cavity, as the entrance to the digestive system, extensive information can be obtained regarding the effects of foods and preventive agents on the oral microbiota and the tooth surfaces. This may lead to a better understanding of strategies to modulate oral and general health.
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Affiliation(s)
- Julia Timpel
- Clinic of Operative and Pediatric Dentistry, Medical Faculty Carl Gustav Carus, Dresden University of Technology, Fetscherstraße 74, 01307, Dresden, Germany.
- Else Kröner-Fresenius Center for Digital Health (EKFZ), Dresden University of Technology, 01309, Dresden, Germany.
| | - Stephanie Klinghammer
- Else Kröner-Fresenius Center for Digital Health (EKFZ), Dresden University of Technology, 01309, Dresden, Germany
- Institute for Materials Science and Max Bergmann Center for Biomaterials, Dresden University of Technology, 01069, Dresden, Germany
| | - Leif Riemenschneider
- Else Kröner-Fresenius Center for Digital Health (EKFZ), Dresden University of Technology, 01309, Dresden, Germany
- Institute for Materials Science and Max Bergmann Center for Biomaterials, Dresden University of Technology, 01069, Dresden, Germany
| | - Bergoi Ibarlucea
- Else Kröner-Fresenius Center for Digital Health (EKFZ), Dresden University of Technology, 01309, Dresden, Germany
- Institute for Materials Science and Max Bergmann Center for Biomaterials, Dresden University of Technology, 01069, Dresden, Germany
| | - Gianaurelio Cuniberti
- Else Kröner-Fresenius Center for Digital Health (EKFZ), Dresden University of Technology, 01309, Dresden, Germany
- Institute for Materials Science and Max Bergmann Center for Biomaterials, Dresden University of Technology, 01069, Dresden, Germany
| | - Christian Hannig
- Clinic of Operative and Pediatric Dentistry, Medical Faculty Carl Gustav Carus, Dresden University of Technology, Fetscherstraße 74, 01307, Dresden, Germany
- Else Kröner-Fresenius Center for Digital Health (EKFZ), Dresden University of Technology, 01309, Dresden, Germany
| | - Torsten Sterzenbach
- Clinic of Operative and Pediatric Dentistry, Medical Faculty Carl Gustav Carus, Dresden University of Technology, Fetscherstraße 74, 01307, Dresden, Germany
- Else Kröner-Fresenius Center for Digital Health (EKFZ), Dresden University of Technology, 01309, Dresden, Germany
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Hihara H, Izumita K, Kawata T, Akatsuka R, Tagaino R, Kitaoka A, Kayaba C, Ikeda K, Sasaki K. A novel treatment based on powder jet deposition technique for dentin hypersensitivity: a randomized controlled trial. BMC Oral Health 2023; 23:695. [PMID: 37759198 PMCID: PMC10537872 DOI: 10.1186/s12903-023-03431-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 09/20/2023] [Indexed: 09/29/2023] Open
Abstract
BACKGROUND This study aimed to evaluate the efficacy and safety of dentin hypersensitivity (DH) treatment using a newly developed device based on a powder jet deposition (PJD) technique that creates a hydroxyapatite (HAP) layer on the dentin surface, thereby alleviating the hypersensitivity. The effect of the PJD treatment was compared with that of conventional treatment using Teethmate Desensitizer (TMD; calcium-phosphate containing material with TTCP (Ca4(PO4)2O) and DCPA (CaHPO4)), which has been used clinically in Japan with well-confirmed effectiveness. MATERIALS AND METHODS A randomized controlled trial was conducted including 35 patients who had symptoms of DH in two or more quadrants. Two test teeth were selected per patient (70 teeth in total) and randomly assigned to PJD or TMD treatment. The efficacy was evaluated using the improvement rate for air and scratch pain according to the scores obtained via visual analog scale 12 weeks after treatment. The safety assessment was performed focusing on gingival index (GI) and spontaneous pain. The t-test was used to analyze the non-inferiority of PJD treatment compared to TMD treatment. RESULTS The improvement rate of air pain was 69.0% for PJD and 69.7% for TMD. The improvement rate of scratch pain was 80.8% for PJD and 81.7% for TMD. Non-inferiority with a margin of 10% was not observed for both air and scratch pain. No change was observed in GI from baseline and the improvement rate of spontaneous pain for PJD was higher than that for TMD. CONCLUSION Non-inferiority of PJD to TMD treatment was not observed in this study; however, it was not statistically demonstrated, and the results were thus interpreted as inconclusive. PJD did improve the DH symptoms, as did TMD. PJD's therapeutic effect was most likely attributable to the deposition of a HAP layer on the tooth surface, which would alleviate hypersensitivity for at least 12 weeks without causing severe adverse events. TRIAL REGISTRATION UMIN-CTR. ID: UMIN000025022. date: 02/12/2016.
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Affiliation(s)
- Hiroki Hihara
- Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo- machi, Aoba-ku, Sendai, Miyagi, 980-8575, Japan.
| | - Kuniyuki Izumita
- Perioperative Oral Care Support, Tohoku University Hospital, 4-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8575, Japan
| | - Tetsuo Kawata
- Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo- machi, Aoba-ku, Sendai, Miyagi, 980-8575, Japan
- Otemachi Kawata Dental Clinic, 6-19 Otemachi, Aoba-ku, Sendai, Miyagi, 980-0805, Japan
| | - Ryo Akatsuka
- Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo- machi, Aoba-ku, Sendai, Miyagi, 980-8575, Japan
- Akatsuka Dental Clinic, 2838-1 Mawatari, Hitachinaka, Ibaraki, 312-0012, Japan
| | - Ryo Tagaino
- Division of Molecular and Regenerative Prosthodontics, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aobaku, Sendai, Miyagi, 980-8575, Japan
| | - Aki Kitaoka
- Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo- machi, Aoba-ku, Sendai, Miyagi, 980-8575, Japan
| | - Chie Kayaba
- Department of Development Promotion, Clinical Research, Innovation and Education Center, Tohoku University Hospital, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan
| | - Koji Ikeda
- Department of Development Promotion, Clinical Research, Innovation and Education Center, Tohoku University Hospital, 1-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8574, Japan
| | - Keiichi Sasaki
- Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi, 980-8575, Japan
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Carey CM. Remineralization of Early Enamel Lesions with Apatite-Forming Salt. Dent J (Basel) 2023; 11:182. [PMID: 37623278 PMCID: PMC10453125 DOI: 10.3390/dj11080182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 07/04/2023] [Accepted: 07/25/2023] [Indexed: 08/26/2023] Open
Abstract
OBJECTIVES This study sought to evaluate the remineralization of ex vivo human teeth using commercially available artificial saliva, SalivaMAX®, a supersaturated calcium phosphate rinse (SSCPR). METHODS early enamel lesions were artificially induced on ex vivo human teeth by chemical means. The teeth were exposed to the SSCPR for two minutes (experimental) or dH2O (control) four times per day for a total of 35 days. At time points of 0, 2.5, 21, and 35 days, micro-CT was utilized to determine the mineral density profile across the lesion and evaluate lesion depth. The relative percent remineralization was calculated from the initial lesion depth (Time 0) at each evaluation time. Student's t-test was used to compare the extent of remineralization between the SSCPR and control groups for statistical significance at each time. To evaluate the changes in percent remineralization over time, a two-way ANOVA was used. RESULTS At Time 0 and 2.5 days, there was no difference in the percent remineralization between the SSCPR and control groups (p > 0.05). After 21 days, the teeth exposed to the SSCPR remineralized 56.7 ± 3.7%, while the control only remineralized 10.7 ± 11.0% (p < 0.0001). At day 35, the remineralization was 73.7 ± 5.4% and 18.2 ± 10.8% (p < 0.0001) for the SSCPR and control groups, respectively. CONCLUSIONS A marked increase in remineralization occurred with the use of the SSCPR. Notably, the remineralization of the SSCPR occurred deep within the tooth and progressed toward the surface over time.
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Affiliation(s)
- Clifton M Carey
- School of Dental Medicine, University of Colorado, Aurora, CO 80045, USA
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Riboni N, Bianchi F, Mattarozzi M, Peracchia M, Meleti M, Careri M. Ultra-high performance liquid chromatography high-resolution mass spectrometry for metabolomic analysis of dental calculus from Duke Alessandro Farnese and Maria D'Aviz. Sci Rep 2023; 13:8967. [PMID: 37268814 DOI: 10.1038/s41598-023-36177-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Accepted: 05/30/2023] [Indexed: 06/04/2023] Open
Abstract
Dental calculus is a valuable resource for the reconstruction of dietary habits and oral microbiome of past populations. In 2020 the remains of Duke Alessandro Farnese and his wife Maria D'Aviz were exhumed to get novel insights into the causes of death. This study aimed to investigate the dental calculus metabolome of the noble couple by untargeted metabolomics. The pulverized samples were decalcified in a water-formic acid mixture, extracted using methanol/acetonitrile and analyzed by ultra-high performance liquid chromatography coupled to high-resolution mass spectrometry (UHPLC-HRMS) using a reversed-phase separation followed by electrospray ionization and full scan in positive and negative ion mode. Waters Synapt-G2-Si High-Definition hybrid quadrupole time-of-flight mass spectrometer was used. Significant features were then identified using MSE acquisition mode, recording information on exact mass precursor and fragment ions within the same run. This approach, together with data pre-treatment and multivariate statistical analysis allowed for the identification of compounds able to differentiate between the investigated samples. More than 200 metabolites were identified, being fatty acids, alcohols, aldehydes, phosphatidylcholines, phosphatidylglycerols, ceramides and phosphatidylserines the most abundant classes. Metabolites deriving from food, bacteria and fungi were also determined, providing information on the habits and oral health status of the couple.
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Affiliation(s)
- Nicolo' Riboni
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area Delle Scienze 17/A, 43124, Parma, Italy.
| | - Federica Bianchi
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area Delle Scienze 17/A, 43124, Parma, Italy.
| | - Monica Mattarozzi
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area Delle Scienze 17/A, 43124, Parma, Italy
| | - Marianna Peracchia
- Department of Medicine and Surgery, Centro Universitario di Odontoiatria, University of Parma, Via Gramsci 14, 43126, Parma, Italy
| | - Marco Meleti
- Department of Medicine and Surgery, Centro Universitario di Odontoiatria, University of Parma, Via Gramsci 14, 43126, Parma, Italy
| | - Maria Careri
- Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parco Area Delle Scienze 17/A, 43124, Parma, Italy
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Yoshikuni Y, Iijima M, Takahashi G, Okumura T, Kogure T, Suzuki M. Effect of phosphoproteins on intracellular calcification of bacteria. Eur J Oral Sci 2023; 131:e12929. [PMID: 36929523 DOI: 10.1111/eos.12929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Accepted: 02/22/2023] [Indexed: 03/18/2023]
Abstract
This study aimed to evaluate the effects of phosphoproteins on bacterial mineralization. Dental calculus formation is attributed to bacterial mineralization in the oral cavity; however, the influence of phosphoproteins (which are abundant in saliva) is not clear. The model bacterium Escherichia coli was suspended in a calcification solution containing casein as a model phosphoprotein. To evaluate mineralization independent of bacterial metabolism, bacteria killed by heat treatment at 70°C were compared with viable bacteria. After incubation at 37°C for 24 h, the mode of calcification was observed using electron microscopy and energy dispersive x-ray spectroscopy. Solutions without casein produced precipitation in solution, which was identical to that in experiments without bacteria. In contrast, calcification solutions with 200 ppm casein only produced calcium phosphate deposition intracellularly. Without heat treatment, intracellular calcification rarely occurred, even when casein was added. Thus, phosphoproteins promoted intracellular calcification of dead bacteria; this is similar to the calcification of insoluble matrices, such as collagen fibrils, promoted by acidic polymers. We concluded that intracellular calcification is caused by the collagen fibril-like behavior of dead bacteria. The promotion of intracellular calcification of dead bacteria by phosphoproteins suggested a basic principle of dental calculus formation.
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Affiliation(s)
- Yukihisa Yoshikuni
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Mayumi Iijima
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Gen Takahashi
- Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Taiga Okumura
- Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Toshihiro Kogure
- Department of Earth and Planetary Science, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo, Japan
| | - Michio Suzuki
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences, University of Tokyo, Bunkyo-ku, Tokyo, Japan
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PERTEK HATİPOĞLU F, HATİPOĞLU Ö. Association Between Etiological Factors and Dentin Hypersensitivity: A Cross-Sectional Study in Turkey. Clinical and Experimental Health Sciences 2022. [DOI: 10.33808/clinexphealthsci.1071585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/22/2023]
Abstract
Objective: This study purposed to estimate the prevalence of DH and how effective the etiological factors are in the development of DH in Turkey.
Methods: Demographic features, hygiene habits, bruxism, beverage habits, parafunctional habits, smoking, and other medical problems were asked. Air was blasted to the teeth via the air-water syringe for 3 seconds. The Visual Analogue Scale was used to measure DH sensitivity, and data were recorded in the 0-100 mm range, and 5 mm and higher were considered DH. The attrition, abrasion, erosion, abfraction per dental type (Incisal OR Canine OR Premolar OR Molar) were recorded. The same procedure was applied for abnormal tooth position and gingival recession.
Results: A total of 4476 teeth and 236 individuals were evaluated. Significantly higher DH frequency was observed in females (p= .034), the 40- 55 age range (p= .009), and non-smokers (p= .016). Those who brushed their teeth three times a day or more (p< .001), preferred horizontal technique (p= .017), used toothbrushes with a hard bristle (p< .001) exhibited higher DH frequency. There was no significant difference in DH regarding bruxism, acidic beverage consumption, vomiting, and reflux (p> .05).
Conclusion: DH is a multi-etiological symptom affected by demographic attributes, hygiene, and other habits. Clinicians should painstakingly distinguish the source of DH to gain the long-term success of DH treatment, which depends on many etiological factors.
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Affiliation(s)
- Fatma PERTEK HATİPOĞLU
- NIGDE OMER HALISDEMIR UNIVERSITY, FACULTY OF DENTISTRY, DEPARTMENT OF CLINICAL SCIENCES (FACULTY OF DENTISTRY), DEPARTMENT OF ENDODONTICS
| | - Ömer HATİPOĞLU
- NIGDE OMER HALISDEMIR UNIVERSITY, FACULTY OF DENTISTRY, DEPARTMENT OF CLINICAL SCIENCES (FACULTY OF DENTISTRY), DEPARTMENT OF RESTORATIVE DENTISTRY
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Arafa A, Filfilan SS, Fansa HA. Erosive effect of beverages on surface hardness and ultra-structure of deciduous teeth enamel. Pediatric Dental Journal 2022. [DOI: 10.1016/j.pdj.2022.08.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Baik A, Alamoudi N, El-Housseiny A, Altuwirqi A. Fluoride Varnishes for Preventing Occlusal Dental Caries: A Review. Dent J (Basel) 2021; 9:64. [PMID: 34204978 PMCID: PMC8229232 DOI: 10.3390/dj9060064] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 05/19/2021] [Accepted: 05/28/2021] [Indexed: 11/16/2022] Open
Abstract
Dental caries are most likely to occur on occlusal surfaces from the early eruptive stages of the tooth. In children, about 80% to 90% of dental caries are occlusal caries. Different preventive modalities are used to prevent occlusal caries. One of the methods used for occlusal caries prevention is fluoride varnish. A vast number of clinical trials have evaluated several types of sealant material and fluoride varnish to assess their ability to prevent occlusal caries in both primary and permanent dentition. The purpose of the current study was to provide an updated overview of the development, composition, mechanism of action, application, and safety of fluoride varnish, as well as its effect on occlusal caries prevention. This review of recently published studies on fluoride varnish and its effect on occlusal caries prevention shows that in children at moderate to high risk of caries, fluoride varnishes prevent occlusal caries. Both resin-based fissure sealants and fluoride varnish are effective for occlusal caries prevention for first-permanent molars. However, it was not possible to identify which one has the best effect. It is recommend that fluoride varnish is applied for children at high risk of caries two to four times per year.
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Affiliation(s)
- Alaa Baik
- Pediatric Dentistry Department, King Abdulaziz University Dental Hospital, Jeddah 21589, Saudi Arabia;
| | - Najlaa Alamoudi
- Pediatric Dentistry Department, Faculty of Dentistry, King Abdulaziz University, Jeddah 21589, Saudi Arabia;
| | - Azza El-Housseiny
- Pediatric Dentistry Department, Faculty of Dentistry, Alexandria University, Alexandria 21526, Egypt;
| | - Amani Altuwirqi
- Pediatric Dentistry Department, Faculty of Dentistry, King Abdulaziz University, Jeddah 21589, Saudi Arabia;
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Abstract
Food industries are challenged to reformulate foods and beverages with higher protein contents to lower fat and sugar content. However, increasing protein concentration can reduce sensory acceptability due to astringency perception. Since the properties of food-saliva mixtures govern mouthfeel perception, understanding how saliva and protein interact is key to guide development of future protein-rich reformulations with optimal sensory attributes. Hence, this systematic review investigated protein-saliva interaction using both model and real human saliva, including a quality assessment. A literature search of five databases (Medline, Pubmed, Embase, Scopus and Web of Science) was undertaken covering the last 20 years, yielding 36 604 articles. Using pre-defined criteria, this was reduced to a set of 33 articles with bulk protein solutions (n = 17), protein-stabilized emulsions (n = 13) and protein-rich food systems (n = 4). Interaction of dairy proteins, lysozyme and gelatine with model or human saliva dominated the literature. The pH was shown to have a strong effect on electrostatic interaction of proteins with negatively-charged salivary mucins, with greater interactions occurring below the isoelectric point of proteins. The effect of protein concentration was unclear due to the limited range of concentrations being studied. Most studies employed a 1 : 1 w/w protein : saliva ratio, which is not representative of true oral conditions. The interaction between protein and saliva appears to affect mouthfeel through aggregation and increased friction. The searches identified a gap in research on plant proteins. Accurate simulation of in vivo oral conditions should clarify understanding of protein-saliva interaction and its influence on sensory perception.
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Affiliation(s)
- Frances N Brown
- Food Colloids and Bioprocessing Group, School of Food Science and Nutrition, University of Leeds, Leeds, UK.
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Karlinsey R. Fluoride Plus Calcium Phosphate Varnishes: A Possible Link between Mineral Phase Formations and Observed Clinical Outcomes. Dent Hypotheses 2021. [DOI: 10.4103/denthyp.denthyp_117_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Sørensen LK, Hasselstrøm JB, Larsen LS, Bindslev DA. Entrapment of drugs in dental calculus - Detection validation based on test results from post-mortem investigations. Forensic Sci Int 2020; 319:110647. [PMID: 33341470 DOI: 10.1016/j.forsciint.2020.110647] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2020] [Revised: 11/30/2020] [Accepted: 12/03/2020] [Indexed: 11/26/2022]
Abstract
For prospective investigation of drugs and metabolites in archaeological and contemporary dental calculus, a sensitive, broadly applicable ultra-high-performance liquid chromatography-tandem mass spectrometry method using pneumatically assisted electrospray ionisation (UHPLC-ESI-MS/MS) was developed. The dental calculus was treated with citric acid and the dissolution extracts were cleaned using weak and strong polymeric cation-exchange sorbents. The method was validated on hydroxyapatite for the analysis of 67 drugs and metabolites. Typically, the lower limits of quantification were in the range of 0.01-0.05ng for the sample mass extracted. The general applicability of the method was tested using dental calculus material sampled from 10 corpses undergoing forensic autopsy. The calculus material was washed several times before dissolution to remove residual substances originating from saliva, gingival crevicular fluid and blood. The wash extracts and the calculus samples (cleaned calculus material) were analysed using the same instrumental conditions. The dry mass of the calculus samples ranged from 1 to 10mg. The total number of drug detections was 131 in the dental calculus samples and 117 in the whole blood samples. From the analyses of the wash extracts and calculus samples, it was proven that drug residues were trapped in the interior of the calculus material. In 82 of the drug detections, the drug concentrations were higher in the dental calculus than in the blood. Among substances detected in the dental calculus but not in the blood were cocaine, heroin, 6-MAM and THCA-A.
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Affiliation(s)
- Lambert K Sørensen
- Section for Forensic Chemistry, Department of Forensic Medicine, Aarhus University, Palle Juul-Jensens Boulevard 99, 8200, Aarhus N, Denmark.
| | - Jørgen B Hasselstrøm
- Section for Forensic Chemistry, Department of Forensic Medicine, Aarhus University, Palle Juul-Jensens Boulevard 99, 8200, Aarhus N, Denmark
| | - Line S Larsen
- Section of Dental Pathology, Operative Dentistry and Endodontics, Health, Aarhus University, Vennelyst Boulevard 9, 8000, Aarhus C, Denmark
| | - Dorthe A Bindslev
- Section for Forensic Pathology, Department of Forensic Medicine, Aarhus University, Palle Juul-Jensens Boulevard 99, 8200, Aarhus N, Denmark
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Abstract
CLINICAL RELEVANCE Teethmate Desensitizer, Clinpro White Varnish, Shield Force Plus, and Gluma could be recommended for treating dentin hypersensitivity in terms of clinical efficacy. SUMMARY Objective: The aim of this study was to evaluate the clinical efficacy of widely used dentindesensitizing agents (DDAs) (Teethmate Desensitizer, Clinpro White Varnish, Shield Force Plus, and Gluma) in the treatment of dentin hypersensitivity (DH) according to different evaluation parameters over a four-week follow-up period.Methods and Materials: This study was a randomized, single-center, controlled, parallel group study involving 144 teeth in 40 subjects. The baseline DH levels of the subjects were determined using different evaluation parameters. Daily life hypersensitivity and evaporative air stimulus hypersensitivity scores were recorded using a visual analog scale (VAS), and tactile hypersensitivity scores were recorded using a Yeaple probe and measured in grams and on the VAS. Subjects who experienced evaporative air stimulus DH (30-80 mm on the VAS) and tactile hypersensitivity (10-50 g with the Yeaple probe) were included in the study. After application of the DDAs, these evaluation parameters were recorded throughout the follow-up period (immediately after application and at one day and two and four weeks post-application).Results: All four DDAs demonstrated clinical dentin-desensitizing effects throughout the follow-up period according to evaporative air hypersensitivity, tactile sensitivity (g-VAS), and daily life hypersensitivity scores (p<0.05). Only Clinpro White Varnish had tactile sensitivity (g) scores that were similar at baseline and the one-day follow-up (p>0.05). A comparison of DH-reducing effects among the DDAs revealed that they yielded different results immediately after application and at the one-day follow-up time point, depending on which evaluation parameter was used. However, all DDAs showed similar DH-reducing effects at the two- and four-week follow-up time points.Conclusions: Teethmate Desensitizer, Clinpro White Varnish, Shield Force Plus, and Gluma DH showed clinical efficacy for four weeks. DDAs may produce inconsistent clinical evaluation scores not only across different evaluation parameters but also between early and later follow-up time points.
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Pires PM, Neves AA, Makeeva IM, Schwendicke F, Faus-Matoses V, Yoshihara K, Banerjee A, Sauro S. Contemporary restorative ion-releasing materials: current status, interfacial properties and operative approaches. Br Dent J 2020; 229:450-8. [PMID: 33037365 DOI: 10.1038/s41415-020-2169-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2020] [Accepted: 05/06/2020] [Indexed: 02/08/2023]
Abstract
Minimally invasive (MI) concepts in restorative dentistry in the year 2020 request from the practitioner not only a scientifically supported rationale for carious tissue removal/excavation and defect-oriented, biological cavity preparation, but also a deep understanding of how to ensure a biomechanically stable and durable restoration in different clinical situations by applying different restorative options. Bio-interactive materials play an increasingly relevant role, as they not only replace diseased or lost tissue, but also optimise tissue mineral recovery (among other properties) when used in restorative and preventive dentistry. Indeed, this is of certain interest in MI restorative dentistry, especially in those cases where gap formation jeopardises the integrity of the margins along resin composite restorations, causing penetration of bacteria and eventually promoting the formation of secondary caries. Recently, the interest in whether ion-releasing materials may reduce such biofilm penetration into margin gaps and reduce such a risk for development and propagation of secondary caries is growing significantly among clinicians and scientists. The aim of this article was to explore mechanisms involved in the process that allow mineral deposition at the interface between such materials and dentine, and to describe how conventional 'bioactive' restorative materials currently available on the market may benefit treatments in MI dentistry.
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Lenton S, Wang Q, Nylander T, Teixeira S, Holt C. Structural Biology of Calcium Phosphate Nanoclusters Sequestered by Phosphoproteins. Crystals 2020; 10:755. [DOI: 10.3390/cryst10090755] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Biofluids that contain stable calcium phosphate nanoclusters sequestered by phosphopeptides make it possible for soft and hard tissues to co-exist in the same organism with relative ease. The stability diagram of a solution of nanocluster complexes shows how the minimum concentration of phosphopeptide needed for stability increases with pH. In the stable region, amorphous calcium phosphate cannot precipitate. Nevertheless, if the solution is brought into contact with hydroxyapatite, the crystalline phase will grow at the expense of the nanocluster complexes. The physico-chemical principles governing the formation, composition, size, structure, and stability of the complexes are described. Examples are given of complexes formed by casein, osteopontin, and recombinant phosphopeptides. Application of these principles and properties to blood serum, milk, urine, and resting saliva is described to show that under physiological conditions they are in the stable region of their stability diagram and so cannot cause soft tissue calcification. Stimulated saliva, however, is in the metastable region, consistent with its role in tooth remineralization. Destabilization of biofluids, with consequential ill-effects, can occur when there is a failure of homeostasis, such as an increase in pH without a balancing increase in the concentration of sequestering phosphopeptides.
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Luong MN, Huang L, Chan DCN, Sadr A. In Vitro Study on the Effect of a New Bioactive Desensitizer on Dentin Tubule Sealing and Bonding. J Funct Biomater 2020; 11:E38. [PMID: 32498468 DOI: 10.3390/jfb11020038] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2020] [Revised: 05/24/2020] [Accepted: 05/25/2020] [Indexed: 11/16/2022] Open
Abstract
Bioactive mineral-based dentin desensitizers that can quickly and effectively seal dentinal tubules and promote dentin mineralization are desired. This in vitro study evaluated a novel nanohydroxyapatite-based desensitizer, Predicta (PBD, Parkell), and its effect on bond strength of dental adhesives. Human dentin discs (2-mm thick) were subjected to 0.5 M EDTA to remove the smear layer and expose tubules, treated with PBD, and processed for surface and cross-sectional SEM examination before and after immersion in simulated body fluid (SBF) for four weeks (ISO 23317-2014). The effects of two dental desensitizers on the microshear bond strength of a universal adhesive and a two-step self-etch system were compared. SEM showed coverage and penetration of nanoparticles in wide tubules on the PBD-treated dentin at the baseline. After four weeks in SBF, untreated dentin showed amorphous mineral deposits while PBD-treated dentin disclosed a highly mineralized structure integrated with dentin. Desensitizers significantly reduced microshear bond strength test (MSBS) of adhesives by 15-20% on average, depending on the bonding protocol. In conclusion, PBD demonstrated effective immediate tubules sealing capability and promoted mineral crystal growth over dentin and into the tubules during SBF-storage. For bonding to desensitizer-treated dentin, a two-step self-etching adhesive or universal bond with phosphoric acid pretreatment are recommended.
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Cardoso AA, de Sousa ET, Steiner-Oliveira C, Parisotto TM, Nobre-Dos-Santos M. A high salivary calcium concentration is a protective factor for caries development during orthodontic treatment. J Clin Exp Dent 2020; 12:e209-e214. [PMID: 32190189 PMCID: PMC7071533 DOI: 10.4317/jced.56331] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2019] [Accepted: 01/08/2020] [Indexed: 11/24/2022] Open
Abstract
Background This research aimed to evaluate the salivary concentrations of fluoride (F-), calcium (Ca2+), and phosphate (Pi) after brackets bonding, and to identify the role of [F-], [Ca2+], and [Pi] on the development of active caries lesion (ACL) in individuals under fixed orthodontic treatment.
Material and Methods A longitudinal investigation with twenty-two individuals from 11 to 22 years of age was performed in four phases (baseline and after 1, 3, and 6 months). Analyses were carried out considering the salivary concentration of [F-], [Ca2+], and [Pi], as well as the caries index. Data were analyzed using the Friedman test, followed by the Wilcoxon test and the multivariate Cox model (p≤0.05).
Results 1 and 3 months after appliance bonding, the [Ca2+] was statistically lower than after 6 months (p<0.0083). On the other hand, salivary [F-] and [Pi] did not show any significant difference during the follow-up. The Cox model demonstrated that the increase of 1 µg/mL in Ca2+ decreased the risk of ACL development by 27%. In conclusion, the levels of Ca2+ changed during orthodontic treatment.
Conclusions A high Ca2+ level in the saliva is a protective factor for ACL development over time. Key words:Adolescents, bioinorganic chemistry, dental caries, orthodontic appliances.
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Affiliation(s)
- Andreia-Alves Cardoso
- Department of Pediatric Dentistry, Piracicaba Dental School, University of Campinas-UNICAMP, Limeira Avenue 901, Piracicaba-SP, Brazil
| | - Emerson-Tavares de Sousa
- Department of Pediatric Dentistry, Piracicaba Dental School, University of Campinas-UNICAMP, Limeira Avenue 901, Piracicaba-SP, Brazil
| | - Carolina Steiner-Oliveira
- Department of Pediatric Dentistry, Piracicaba Dental School, University of Campinas-UNICAMP, Limeira Avenue 901, Piracicaba-SP, Brazil
| | - Thaís-Manzano Parisotto
- Laboratory of Microbiology and Molecular Biology, Dental School, São Francisco University, Bragança Paulista - SP, Brazil
| | - Marinês Nobre-Dos-Santos
- Department of Pediatric Dentistry, Piracicaba Dental School, University of Campinas-UNICAMP, Limeira Avenue 901, Piracicaba-SP, Brazil
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Brandão E, Silva MS, García-Estévez I, Williams P, Mateus N, Doco T, de Freitas V, Soares S. Inhibition Mechanisms of Wine Polysaccharides on Salivary Protein Precipitation. J Agric Food Chem 2020; 68:2955-2963. [PMID: 31690078 DOI: 10.1021/acs.jafc.9b06184] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
In this work, high-performance liquid chromatography, fluorescence quenching, nephelometry, and sodium dodecyl sulfate polyacrylamide gel electrophoresis were used to study the effect of polysaccharides naturally present in wine [rhamnogalacturonan II (RG II) and arabinogalactan proteins (AGPs)] on the interaction between salivary proteins (SP) together present in saliva and tannins (punicalagin (PNG) and procyanidin B2). In general, the RG II fraction was more efficient to inhibit SP precipitation by tannins, especially for acidic proline-rich proteins (aPRPs) and statherin/P-B peptide, than AGPs. The RG II fraction can act mainly by a competition mechanism in which polysaccharides compete by tannin binding. However, in the presence of Na+ ions in solution, no RG II effect was observed on SP-tannin interactions. On the other hand, dependent upon the saliva sample as well as the tannin studied, AGPs can act by both mechanisms, competition and ternary (formation of a ternary complex with SP-tannin aggregates enhancing their solubility).
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Affiliation(s)
- Elsa Brandão
- REQUIMTE, LAQV, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
| | - Mafalda Santos Silva
- REQUIMTE, LAQV, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
| | - Ignacio García-Estévez
- REQUIMTE, LAQV, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
| | - Pascale Williams
- Joint Research Unit 1083, Sciences for Enology, Institut National de la Recherche Agronomique (INRA), 2 Place Pierre Viala, F-34060 Montpellier, France
| | - Nuno Mateus
- REQUIMTE, LAQV, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
| | - Thierry Doco
- Joint Research Unit 1083, Sciences for Enology, Institut National de la Recherche Agronomique (INRA), 2 Place Pierre Viala, F-34060 Montpellier, France
| | - Victor de Freitas
- REQUIMTE, LAQV, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
| | - Susana Soares
- REQUIMTE, LAQV, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Rua do Campo Alegre, s/n, 4169-007 Porto, Portugal
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de Sousa ET, Lima-Holanda AT, Nobre-Dos-Santos M. Changes in the salivary electrolytic dynamic after sucrose exposure in children with Early Childhood Caries. Sci Rep 2020; 10:4146. [PMID: 32139791 PMCID: PMC7057989 DOI: 10.1038/s41598-020-61128-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Accepted: 02/18/2020] [Indexed: 01/01/2023] Open
Abstract
This study sought to explore if the effect of 20% sucrose rinse (SR) on the salivary electrolytic concentration of calcium (Ca2+), phosphate (Pi) and fluoride (F-) in children with Early Childhood Caries (ECC) is different from healthy children. Here, fifty-eight preschoolers aged 3 to 5 years were divided into 2 groups: caries-free (CF) and with ECC. Changes in saliva flow rate, pH and buffering capacity (BC), as well as in concentrations of Ca2+, Pi, and F-, and the degree of saturation in relation to hydroxyapatite (DSS HAp) and fluorapatite (DSS FAp) were evaluated. The pre-rinse [Ca2+] was higher in the ECC group in the CF group. A significant increase in [Ca2+] was demonstrated after SR in the CF group (p = 0.05). The [Pi] was reduced by 18% after SR in the ECC group (p = 0.007). The [F-] reduced in both groups after SR (p < 0.000). There was a moderate positive correlation between [Ca2+] and the DSS HAp and DSS FAp. Multivariate analysis showed that children with a higher [Ca2+] in pre-rinse saliva are more likely to have ECC. In conclusion, the effect of a 20% sucrose rinse on the electrolytic concentration of Ca2+, Pi and F- was different when children with ECC were compared with CF children.
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Affiliation(s)
- Emerson Tavares de Sousa
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, University of Campinas-UNICAMP, Av. Limeira 901, Piracicaba, SP, CEP 13414-903, Brazil
| | - Aline Tavares Lima-Holanda
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, University of Campinas-UNICAMP, Av. Limeira 901, Piracicaba, SP, CEP 13414-903, Brazil
| | - Marinês Nobre-Dos-Santos
- Department of Health Sciences and Pediatric Dentistry, Piracicaba Dental School, University of Campinas-UNICAMP, Av. Limeira 901, Piracicaba, SP, CEP 13414-903, Brazil.
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Rovera A, Rovera G, Alzahrani A, Hector M, Anderson P. Correlation between parotid saliva composition and dental caries using 31P-NMR and ICDAS score. Arch Oral Biol 2020; 111:104651. [DOI: 10.1016/j.archoralbio.2020.104651] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 01/02/2020] [Accepted: 01/04/2020] [Indexed: 11/18/2022]
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21
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Denucci GC, Mantilla TF, Amaral F, Basting RT, França F, Turssi CP. Saliva with reduced calcium and phosphorous concentrations: Effect on erosion dental lesions. Oral Dis 2018; 24:957-963. [PMID: 29423930 DOI: 10.1111/odi.12843] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2017] [Revised: 12/27/2017] [Accepted: 01/31/2018] [Indexed: 11/26/2022]
Abstract
OBJECTIVES To investigate whether saliva formulations with reduced calcium (Ca) and inorganic phosphorous (Pi) concentration would affect dental erosion caused by hydrochloric acid (HCl). METHODS Enamel and root dentine bovine slabs were embedded, polished, and measured for surface Knoop microhardness (SMH). After reference areas were created, specimens were exposed to HCl solution (0.01 M; pH 2; 120 s) and immersed in artificial salivas (6 hr) containing three different Ca/Pi concentrations (n = 15), which simulate serum conditions of normo-, mild, or severe hypocalcemia. The control group was immersed in Ca/Pi-free saliva. The study protocol was carried out 2×/day for 5 days. Surface loss of enamel and root dentine was assessed using an optical profilometer, and SMH was remeasured for enamel. RESULTS One-way analysis of variance (p < .001) and Tukey's test showed that enamel loss in groups subjected to artificial salivas that simulated mild or severe hypocalcemia did not differ from that resembling normocalcemia. %SMH was lower when saliva was mildly and normally concentrated in Ca/Pi (p < .001). Root dentine loss was higher in saliva simulating severe hypocalcemia than in those referring to mild, hypo-, and normocalcemia. CONCLUSIONS Depending on the dental substrate, salivary formulations resembling serum hypocalcemia affected surface loss due to erosion and rehardening thereof.
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Affiliation(s)
- G C Denucci
- São Leopoldo Mandic School of Dentistry, Campinas, Brazil
| | - T F Mantilla
- Department of Restorative Dentistry, School of Dentistry, University of São Paulo, São Paulo, Brazil
| | - Flb Amaral
- Division of Cariology and Restorative Dentistry, São Leopoldo Mandic Institute and Dental Research Center, Campinas, Brazil
| | - R T Basting
- Division of Cariology and Restorative Dentistry, São Leopoldo Mandic Institute and Dental Research Center, Campinas, Brazil
| | - Fmg França
- Division of Cariology and Restorative Dentistry, São Leopoldo Mandic Institute and Dental Research Center, Campinas, Brazil
| | - C P Turssi
- Division of Cariology and Restorative Dentistry, São Leopoldo Mandic Institute and Dental Research Center, Campinas, Brazil
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Zhang J, Lynch RJ, Watson TF, Banerjee A. Remineralisation of enamel white spot lesions pre-treated with chitosan in the presence of salivary pellicle. J Dent 2018; 72:21-8. [DOI: 10.1016/j.jdent.2018.02.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 02/16/2018] [Accepted: 02/19/2018] [Indexed: 11/23/2022] Open
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Shahmoradi M, Hunter N, Swain M. Efficacy of Fluoride Varnishes with Added Calcium Phosphate in the Protection of the Structural and Mechanical Properties of Enamel. Biomed Res Int 2017; 2017:7834905. [PMID: 29362716 DOI: 10.1155/2017/7834905] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 10/29/2017] [Indexed: 11/17/2022]
Abstract
The aim of this study was to investigate the efficacy of various fluoride varnishes in the protection of the structural and nanomechanical properties of dental enamel. Demineralized enamel specimens were imaged using a high-resolution micro-CT system and lesion parameters including mineral density and lesion depth were extracted from mineral density profiles. Nanoindentation elastic modulus and hardness were calculated as a function of penetration depth from the load-displacement curves. The average depth of the lesion in specimens with no prior fluoride varnish treatment was 86 ± 7.19 μm whereas the varnish treated specimens had an average depth of 67 ± 7.03 μm (P < 0.05). The mineral density of enamel lesions with no fluoride varnish treatment had an average of 1.85 gr/cm3 which was 25% lower than the corresponding value in varnish treated enamel and 37% lower than sound enamel. While, in the varnish treated group, elastic modulus and hardness values had decreased by 18% and 23%, respectively, the corresponding values in the non-varnish treated specimens had a reduction of 43% and 54% compared to the sound enamel. The findings from this study highlight the preventive role of fluoride varnishes. Addition of calcium and phosphate does not seem to enhance or inhibit the prevention or remineralization performance of fluoride varnishes.
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Müller WE, Neufurth M, Ackermann M, Tolba E, Korzhev M, Wang S, Feng Q, Schröder HC, Wang X. Bifunctional dentifrice: Amorphous polyphosphate a regeneratively active sealant with potent anti- Streptococcus mutans activity. Dent Mater 2017; 33:753-64. [DOI: 10.1016/j.dental.2017.04.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 03/17/2017] [Accepted: 04/11/2017] [Indexed: 02/06/2023]
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Bel'skaya LV, Kosenok VK, Sarf EA. Chronophysiological features of the normal mineral composition of human saliva. Arch Oral Biol 2017; 82:286-292. [PMID: 28686983 DOI: 10.1016/j.archoralbio.2017.06.024] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2017] [Revised: 06/15/2017] [Accepted: 06/16/2017] [Indexed: 12/18/2022]
Abstract
BACKGROUND The high rate of changes in the composition of saliva can be used for the monitoring of various biorhythms in order to study the physiological characteristics of the human body. RESEARCH OBJECTIVE The study of the dynamics of the near-24-h mineral composition of saliva in men and women. METHODS The study involved 20 men and 20 women, age 23.1±0.9years. Saliva samples were collected every 3h during the day within 10min. The mineral composition of saliva was defined by the capillary electrophoresis technique. The cross-group differences were evaluated using the non-parametric criterion. RESULTS It was shown that the maximum values of the mineralizing capacity fall to 7-8 a.m. and 18-19p.m., which is due to the change in the rate of saliva secretion. The near-24-h dynamics of the saliva pH practically coincides with the dynamics of the Ca/P ratio; there are evident maxima at 9:00 am and 15-18p.m. The values of the Na/K ratio are out of phase with the Ca/P ratio. There is one maximum, corresponding to 3 am in the night, and one minimum at 12-13p.m., which is due to a decreased level of sodium and increased potassium concentration. Statistically valid differences between men and women in pH (p<0.001), concentrations of inorganic phosphorus (p<0.001), as well as Ca/P coefficient (p=0.011) were identified. CONCLUSION The dynamics of the studied parameters during 24h is characterized by pronounced intervals.
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Affiliation(s)
- Lyudmila V Bel'skaya
- KhimServis LLC, 4/2, Lugovaya str., Skolkovo Innovation Center, Moscow, 143026, Russia; Chair of Chemical Technology and Biotechnology, Omsk State Technical University, 11, Prospect Mira, Omsk, 644050, Russia.
| | - Victor K Kosenok
- KhimServis LLC, 4/2, Lugovaya str., Skolkovo Innovation Center, Moscow, 143026, Russia; Chair of Oncology with Radiotherapy, Omsk State Medical Academy, 12, Lenina str., Omsk, 644099, Russia
| | - Elena A Sarf
- KhimServis LLC, 4/2, Lugovaya str., Skolkovo Innovation Center, Moscow, 143026, Russia
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Küchler EC, Pecharki GD, Castro ML, Ramos J, Barbosa F, Brancher JA, Vieira AR, Gerlach RF, Trevilatto PC. Genes Involved in the Enamel Development Are Associated with Calcium and Phosphorus Level in Saliva. Caries Res 2017; 51:225-230. [PMID: 28395292 DOI: 10.1159/000450764] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2016] [Accepted: 09/09/2016] [Indexed: 01/24/2023] Open
Abstract
Saliva components play a crucial role in the integrity of the dental enamel and in caries susceptibility. The saliva characteristics are controlled by many factors, including genetic factors. Therefore, this study aimed to evaluate the association between the genetic variations in genes expressed in enamel development with calcium and phosphorus levels in saliva. We collected 276 unrelated 12-year-old children from private and public schools. Saliva was collected for DNA extraction from oral cells and for measurement of calcium and phosphorus. Inductively coupled plasma-mass spectrometry determined calcium and phosphorus levels in whole saliva. Fifteen genetic variations in 9 genes were analyzed. The genotype was determined by real-time polymerase chain reactions. Data were analyzed using Plink with an alpha of 5%. Genetic variations in AMELX, AMNB and ESRRB were associated with the calcium level in saliva (p < 0.05). A borderline association was observed in ENAM allele distribution shown with phosphate level in saliva (p = 0.049). In conclusion, our results are the first to report that genetic variations contribute to calcium and phosphorus levels in saliva.
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Affiliation(s)
- Erika Calvano Küchler
- Department of Pediatric Dentistry, Ribeirao Preto Dental School, Faculty of Pharmacy of Ribeirao Preto, USP - University of Sao Paulo, Ribeirao Preto, Brazil
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Ishihata H, Kanehira M, Finger WJ, Takahashi H, Tomita M, Sasaki K. Effect of two desensitizing agents on dentin permeability in vitro. J Appl Oral Sci 2017; 25:34-41. [PMID: 28198974 PMCID: PMC5289398 DOI: 10.1590/1678-77572016-0228] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Accepted: 09/15/2016] [Indexed: 11/24/2022] Open
Abstract
Objective The aim of this in vitro study was to investigate the effect of two desensitizing agents and water on hydraulic conductance in human dentin. Material and Methods GLUMA Desensitizer PowerGel (GLU) contains glutaraldehyde (GA) and 2-hydroxyethyl methacrylate (HEMA), and Teethmate Desensitizer (TD) is a powder comprising tetracalcium phosphate (TTCP) and dicalcium phosphate anhydrous (DCPA) that is mixed with water. Deionized water was used as a negative control (CTR). Thirty discs with a thickness of 1.2 mm were cut from the coronal dentin of the third molars and cleaned with 0.5 M EDTA (pH 7.4). After being mounted in a split-chamber device, the discs were pressurized with water at 1 kPa and 3 kPa in order to measure flow rates with a highly sensitive micro-flow sensor and to calculate hydraulic conductance as a baseline value (BL). Following the application of GLU, TD, and CTR (n=10), hydraulic conductance was remeasured with intermittent storage in water after 15 min, 1 d, 1 w, and 1 m. Reduction in permeability (PR%) was calculated from hydraulic conductance. Data were statistically analyzed using nonparametric methods (α<0.05). Representative discs were inspected by SEM. Results PR% for GLU and TD were 30-50% 15 min and 1 m after their application. Post hoc tests indicated that PR% of CTR was significantly greater than those of GLU and TD at all time points tested. The PR% of GLU and TD were not significantly different. SEM examinations showed noncollapsed collagen meshes at the tubular entrances after GLU, and crystalline precipitates occluding the tubular orifices after TD, whereas CTR specimens showed typical patterns of etched dentin. Conclusions The present study on hydraulic conductance in dentin discs treated with two chemically different desensitizing agents and water as a control demonstrated that both products may be characterized as effective.
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Affiliation(s)
- Hiroshi Ishihata
- Tohoku University, Graduate School of Dentistry, Division of Periodontology and Endodontology, Department of Oral Biology, Sendai, Japan
| | - Masafumi Kanehira
- Tohoku University, Graduate School of Dentistry, Division of Operative Dentistry, Department of Restorative Dentistry, Sendai, Japan
| | - Werner J Finger
- Tohoku University, Graduate School of Dentistry, Liaison Center for Innovative Dentistry, Sendai, Japan
| | - Hidekazu Takahashi
- Tokyo Medical and Dental University, Graduate School of Medical and Dental Sciences, Oral Biomaterials Engineering, Tokyo, Japan
| | - Makoto Tomita
- Tokyo Medical and Dental University, Clinical Research Center, Tokyo, Japan
| | - Keiichi Sasaki
- Tohoku University, Graduate School of Dentistry, Division of Advanced Prosthetic Dentistry, Department of Oral Function and Morphology, Sendai, Japan
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Arafa A. Synergetic remineralization effectiveness of calcium, phosphate and fluoride based systems in primary teeth. Pediatric Dental Journal 2017; 27:65-71. [DOI: 10.1016/j.pdj.2016.12.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Bradna P, Vrbova R, Fialova V, Housova D, Gojisova E. Formation of protective deposits by anti-erosive toothpastes-A microscopic study on enamel with artificial defects. Scanning 2016; 38:380-388. [PMID: 26492940 DOI: 10.1002/sca.21281] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Accepted: 10/12/2015] [Indexed: 06/05/2023]
Abstract
This study investigated formation of protective deposits on the enamel surface after application of several anti-erosive toothpastes with different active ingredients. NaF-containing Sensodyne Pronamel, SnCl2 /F-based Elmex Erosion Protection and calcium phosphate-based BioRepair Plus Sensitivity Control, SensiShield and Enamel Care toothpastes with claimed anti-erosive properties were tested. Artificial saliva and Elmex Erosion Protection mouth rinse served as control groups. The toothpastes were applied 30 times by a toothbrush for 2 min per day, mouth rinse for 30 s on polished enamel of thirty five human molars (n = 5) with series of five rhomboid-shaped indents of various length prepared by a Knoop indentor. After 15 and 30 applications, the shape of the indents and surface morphology was characterised using light and scanning electron microscopy. At the end of treatment, the samples were exposed to 0.2 wt. % citric acid (pH 3.30) to test resistance of the treated enamel to erosion. Pronounced differences were observed between protective properties of the toothpastes. While Sensodyne Pronamel and BioRepair Plus Sensitivity Control did not produce any protective deposits, Enamel Care formed a compact layer of deposits which protected the enamel surface against erosion. With Elmex Erosion Protection and SensiShield fractured indent edges and scratches on the treated enamel suggested that their abrasive properties prevailed over ability of active ingredients to form deposits. These results revealed that toothpastes with strong potential to form acid-resistant deposits on the enamel surface and of low abrasivity should be used for effective prevention of enamel erosion. SCANNING 38:380-388, 2016. © 2015 Wiley Periodicals, Inc.
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Affiliation(s)
- Pavel Bradna
- School of Dental Medicine, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague, Czech Republic.
- Department of Stomatology, Third Faculty of Medicine, Charles University in Prague, Prague, Czech Republic.
| | - Radka Vrbova
- School of Dental Medicine, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague, Czech Republic
| | - Vlasta Fialova
- School of Dental Medicine, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague, Czech Republic
| | - Devana Housova
- School of Dental Medicine, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague, Czech Republic
| | - Eva Gojisova
- Department of Stomatology, Third Faculty of Medicine, Charles University in Prague, Prague, Czech Republic
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Ferrazzano GF, Cantile T, Coda M, Alcidi B, Sangianantoni G, Ingenito A, Di Stasio M, Volpe MG. In Vivo Release Kinetics and Antibacterial Activity of Novel Polyphenols-Enriched Chewing Gums. Molecules 2016; 21:E1008. [PMID: 27490529 DOI: 10.3390/molecules21081008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 07/27/2016] [Accepted: 07/29/2016] [Indexed: 11/17/2022] Open
Abstract
Chewing gums may be particularly effective means for delivering and maintaining bioactive molecules, included in the gum formulation, able to have an anti-cariogenic effect. The purposes of this study were: to develop novel chewing gums containing quercetin (Qt); to evaluate their release using in vivo trial; finally, to test their in vivo antibacterial effect against oral Streptococcus mutans strains. A preliminary study was performed to produce new gums, enriched with the polyphenol quercetin. Then, a first in vivo experimental study was assessed to test the percentages of Qt released in the saliva of young volunteers. Moreover, a second clinical trial was performed to analyze the antibacterial capability of these enriched chewing gums against S. mutans strains after 14 days of daily consumption. The release analysis showed that a more effective release of Qt occurs in the first minutes of chewing, and it does not change saliva pH values. Moreover, Qt included in gums demonstrates an effective antibacterial activity, showing a reduction of the concentration of S. mutans strains in saliva samples, especially after 7 days. Qt included in experimental chewing gums could be efficiently released into the oral cavity and could promote an effective anti-caries concentration in volunteer's saliva, without changing salivary pH values.
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Mehta D, Gowda V, Finger WJ, Sasaki K. Randomized, placebo-controlled study of the efficacy of a calcium phosphate containing paste on dentin hypersensitivity. Dent Mater 2015; 31:1298-303. [PMID: 26361810 DOI: 10.1016/j.dental.2015.08.162] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Revised: 07/24/2015] [Accepted: 08/17/2015] [Indexed: 11/28/2022]
Abstract
OBJECTIVE Hypersensitivity of non-carious cervical lesions (DH) is a frequently encountered disease. This randomized, controlled, single-blind crossover study evaluated the effectiveness of a calcium phosphate containing desensitizer paste (TAP) on DH in comparison to water as placebo (PLA). METHODS In this clinical trial 35 patients were randomly assigned to the test and the negative control group. Using a 10cm long VAS (visual analog scale) patients should respond with DH score >6 on one tooth in each of two quadrants for allocation. Pain stimuli were a 2-seconds air blast (AB) and probe scratching (PS) of the exposed dentin. VAS scores were determined pre-operatively (PRE), immediately after treatment (POST), at 1 week, 1, 3 and finally after 6 months. RESULTS Both TAP and PLA applications decreased DH significantly at POST and throughout the 6-months recalls (p<0.001). Pain reductions upon AB stimulation of TAP treated teeth, assessed at POST and 6 months were 35 and 55%, upon PS stimuli 21 and 54%, respectively. PLA treated lesions responded to AB at POST and after 6 months with 20 and 36% pain reduction, to PS with 11 and 30% pain reduction, respectively. Differences between TAP and PLA pain scores were statistically significant at all recalls (p<0.05). SIGNIFICANCE TAP paste reduced DH successfully during this 6-months trial. The calcium phosphate crystallites included in the paste and the presumed hydroxyapatite precipitates upon exposure to saliva were hypothetically able to occlude open dentinal tubules, at least to some extent. TAP is considered a biocompatible desensitizer paste.
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Affiliation(s)
- Deepak Mehta
- Department of Conservative Dentistry and Endodontics, Vokkaligara Sangha Dental College and Hospital, K.R. Road, V.V. Puram, Bangalore 560004, India.
| | - Vishwas Gowda
- Department of Conservative Dentistry and Endodontics, Vokkaligara Sangha Dental College and Hospital, K.R. Road, V.V. Puram, Bangalore 560004, India.
| | - Werner J Finger
- Liaison Center for Innovative Dentistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
| | - Keiichi Sasaki
- Liaison Center for Innovative Dentistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan; Department of Oral Function and Morphology, Division of Advanced Prosthetic Dentistry, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai 980-8575, Japan.
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Schrøder S, Homøe P, Wagner N, Vataire AL, Lundager Madsen HE, Bardow A. Does drinking water influence hospital-admitted sialolithiasis on an epidemiological level in Denmark? BMJ Open 2015; 5:e007385. [PMID: 25941183 PMCID: PMC4420976 DOI: 10.1136/bmjopen-2014-007385] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/05/2014] [Revised: 03/10/2015] [Accepted: 03/20/2015] [Indexed: 11/23/2022] Open
Abstract
OBJECTIVES Sialolithiasis, or salivary stones, is not a rare disease of the major salivary glands. However, the aetiology and incidence remain largely unknown. Since sialoliths are comprised mainly of calcium phosphate salts, we hypothesise that drinking water calcium levels and other elements in drinking water could play a role in sialolithiasis. Owing to substantial intermunicipality differences in drinking water composition, Denmark constitutes a unique environment for testing such relations. DESIGN An epidemiological study based on patient data extracted from the National Patient Registry and drinking water data from the Geological Survey of Denmark and Greenland retrieved as weighted data on all major drinking water constituents for each of the 3364 waterworks in Denmark. All patient cases with International Statistical Classification of Diseases 10th Revision (ICD-10) codes for sialolithiasis registered between the years 2000 and 2010 were included in the study (n=3014) and related to the drinking water composition on a municipality level (n=98). PRIMARY AND SECONDARY OUTCOME MEASURES Multiple regression analysis using iterative search and testing among all demographic and drinking water variables with sialolithiasis incidence as the outcome in search of possible relations among the variables tested. RESULTS The nationwide incidence of hospital-admitted sialolithiasis was 5.5 cases per 100,000 citizens per year in Denmark. Strong relations were found between the incidence of sialolithiasis and the drinking water concentration of calcium, magnesium and hydrogen carbonate, however, in separate models (p<0.001). Analyses also confirmed correlations between drinking water calcium and magnesium and their concentration in saliva whereas this was not the case for hydrogen carbonate. CONCLUSIONS Differences in drinking water calcium and magnesium may play a role in the incidence of sialolithiasis. These findings are of interest because many countries have started large-scale desalination programmes of drinking water.
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Affiliation(s)
- Stine Schrøder
- Department of Otorhinolaryngology, University Hospital of Northern Zealand, Hillerød, Denmark
| | - Preben Homøe
- Department of Otorhinolaryngology and Maxillofacial Surgery, Køge University Hospital, Køge, Denmark
| | - Niels Wagner
- Department of Otorhinolaryngology, University Hospital of Northern Zealand, Hillerød, Denmark
| | | | | | - Allan Bardow
- Department of Oral Medicine, Dental School of Copenhagen, University of Copenhagen, Copenhagen, Denmark
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Thanatvarakorn O, Nakashima S, Sadr A, Prasansuttiporn T, Thitthaweerat S, Tagami J. Effect of a calcium-phosphate based desensitizer on dentin surface characteristics. Dent Mater J 2015; 32:615-21. [PMID: 23903644 DOI: 10.4012/dmj.2013-073] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
This study aimed to evaluate the ability of a newly developed calcium-phosphate desensitizer in dentin permeability reduction and its integration with dentin surface before and after immersion in artificial saliva (AS) under two different dentin surface characteristics; with or without the collagen exposure.Humandentin discs treated by EDTA to expose collagen fibrils or EDTA/NaOCl to expose plain dentin surface were subjected to a calcium-phosphate desensitizer (Teethmate Desensitizer; TMD), while non-desensitizer treatment served as control. TMD application showed the occlusion in dentinal tubules and reduction in dentin permeability up to 92%, regardless of dentin surface characteristics. After AS immersion, permeability reduction percent (PR%) significantly increased in EDTA/NaOCl pretreatment (p<0.05). Newly-formed crystallites were observed on desensitizer treated dentin and EDTA/NaOCl pretreatment control group, whereas the crystallites did not exist on EDTA pretreatment control group. Ultrasonication revealed the integration of the calcium-phosphate rich layer of desensitizer on dentin surface after AS immersion.
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Affiliation(s)
- Ornnicha Thanatvarakorn
- Cariology and Operative Dentistry, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45, Yushima, Bunkyo-ku, Tokyo 113-8549, Japan
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Rodrigues MC, Natale LC, Arana-Chaves VE, Braga RR. Calcium and phosphate release from resin-based materials containing different calcium orthophosphate nanoparticles. J Biomed Mater Res B Appl Biomater 2015; 103:1670-8. [PMID: 25611488 DOI: 10.1002/jbm.b.33327] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2014] [Revised: 10/06/2014] [Accepted: 10/26/2014] [Indexed: 11/07/2022]
Abstract
The study compared ion release from resin-based materials containing calcium orthophosphates. Amorphous calcium phosphate (ACP), dicalcium phosphate anhydrous (DCPA), dicalcium phosphate dihydrate (DCPD), and tricalcium phosphate (β-TCP) nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), dynamic light scattering (DLS), and surface area (nitrogen adsorption isotherms, BET method). Nanoparticles were added to a dimethacrylate-based resin and materials were tested for degree of conversion (DC) and calcium/phosphate release up to 28 days under pH 5.5 and 7.0. Data were analyzed by ANOVA/Tukey test (alpha: 0.05).The crystallinity of DCPA, DCPD, and β-TCP were confirmed, as well as the ACP amorphous nature. DCPD and β-TCP presented larger agglomerates than DCPA and ACP. The surface area of ACP was 5-11 times higher than those of the other nanoparticles. Materials showed similar DC. The material containing ACP released significantly more ions than the others, which released similar amounts of calcium and, in most cases, phosphate. Ion release was not affected by pH. Calcium release decreased between 7 and 21 days, while phosphate levels remained constant after 14 days. In conclusion, ACP higher ion release can be ascribed to its high surface area. DCPA, DCPD, and β-TCP had similar performances as ion-releasing fillers.
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Affiliation(s)
- Marcela C Rodrigues
- Department of Biomaterials and Oral Biology, University of São Paulo, School of Dentistry, São Paulo, São Paulo, Brazil
| | - Livia C Natale
- Department of Biomaterials and Oral Biology, University of São Paulo, School of Dentistry, São Paulo, São Paulo, Brazil
| | - Victor E Arana-Chaves
- Department of Biomaterials and Oral Biology, University of São Paulo, School of Dentistry, São Paulo, São Paulo, Brazil
| | - Roberto R Braga
- Department of Biomaterials and Oral Biology, University of São Paulo, School of Dentistry, São Paulo, São Paulo, Brazil
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Abstract
OBJECTIVE To investigate the effects of four dentin desensitizers on pain reduction in hypersensitive cervical dentin lesions. MATERIALS AND METHODS The trial was designed as a randomized, controlled, four-arm, single-masked study. Fifty subjects with at least one hypersensitive lesion in each of the four quadrants were allocated. The requested pre-operative pain, determined as a response to 2-s air-blast (AB) and probe scratching (PS), was ≥5 on a VAS scale, 0 = no through to 10 = worst pain. Randomly each subject received each of the four treatments: MS Coat One F (MSC, Sun Medical, Japan), Nanoseal (NAN, Nishin, Japan), Teethmate Desensitizer (TMD, Kuraray Noritake, Japan) and Gluma Desensitizer PowerGel (GLU, HeraeusKulzer, Germany). The investigator assessed blindly the pain response using the two stimuli and recorded the patients' VAS scores before and immediately after application, after 1 week and after 1, 3 and 6 months. STATISTICAL DATA TREATMENT: ANOVA and post-hoc testing (p ≤ 0.05). RESULTS Forty-nine subjects completed the trial. Pre-operative dentin hypersensitivity (DH) for the groups was not significantly different. All desensitizers reduced DH significantly throughout the 6-months observation. ANOVA revealed significant differences among VAS scores, obtained with the desensitizing agents (p < 0.001). Ranking by post-hoc testing was: MSC > NAN > TMD > GLU (p < 0.05). Upon PS NAN and TMD showed slight but significant regain of sensitivity after 6 months. For GLU PS scores immediately after application and after 6 months were not significantly different, whereas recalls after 1 week, 1 month and 3 months revealed significantly lower scores. CONCLUSION The calcium phosphate-based TMD and GLU proved highly effective in reducing sensitivity.
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Affiliation(s)
- Deepak Mehta
- Department of Conservative Dentistry and Endodontics, VokkaligaraSangha Dental College and Hospital , Bangalore , India
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Malon RSP, Sadir S, Balakrishnan M, Córcoles EP. Saliva-based biosensors: noninvasive monitoring tool for clinical diagnostics. Biomed Res Int 2014; 2014:962903. [PMID: 25276835 PMCID: PMC4172994 DOI: 10.1155/2014/962903] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Revised: 07/16/2014] [Accepted: 08/11/2014] [Indexed: 02/08/2023]
Abstract
Saliva is increasingly recognised as an attractive diagnostic fluid. The presence of various disease signalling salivary biomarkers that accurately reflect normal and disease states in humans and the sampling benefits compared to blood sampling are some of the reasons for this recognition. This explains the burgeoning research field in assay developments and technological advancements for the detection of various salivary biomarkers to improve clinical diagnosis, management, and treatment. This paper reviews the significance of salivary biomarkers for clinical diagnosis and therapeutic applications, with focus on the technologies and biosensing platforms that have been reported for screening these biomarkers.
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Affiliation(s)
- Radha S. P. Malon
- Faculty of Biosciences and Medical Engineering (FBME), Universiti Teknologi Malaysia, Building VO1, Block A, Level 5, Room 27, 81310 Skudai, Johor, Malaysia
| | - Sahba Sadir
- Faculty of Mechanical Engineering (FKM), Universiti Teknologi Malaysia, 81310 Skudai, Johor, Malaysia
| | - Malarvili Balakrishnan
- Faculty of Biosciences and Medical Engineering (FBME), Universiti Teknologi Malaysia, Building VO1, Block A, Level 5, Room 27, 81310 Skudai, Johor, Malaysia
| | - Emma P. Córcoles
- Faculty of Biosciences and Medical Engineering (FBME), Universiti Teknologi Malaysia, Building VO1, Block A, Level 5, Room 27, 81310 Skudai, Johor, Malaysia
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Zandim-Barcelos DL, Kielbassa AM, Sampaio JE, Tschoppe P. Saliva substitutes in combination with high-fluoride gel on dentin remineralization. Clin Oral Investig 2015; 19:289-97. [PMID: 24872322 DOI: 10.1007/s00784-014-1264-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2013] [Accepted: 05/16/2014] [Indexed: 01/22/2023]
Abstract
OBJECTIVE This study aimed to determine whether the application of a high-fluoride gel could increase the remineralization of subsurface dentin lesions stored in saliva substitutes. MATERIALS AND METHODS Demineralized bovine dentin specimens were stored in mineral water (W), Glandosane (G), or modified Saliva natura (SN). Different treatments were applied twice daily: no treatment, Elmex sensitive mouth rinse (E), ProSchmelz gel (P), Duraphat toothpaste (D), ED, PD, and EPD. Differences in mineral loss were evaluated by transversal microradiography after 2 and 5 weeks. RESULTS The treatments with E, D, and ED inhibited the mineral loss induced by G and enabled some mineral gain. ProSchmelz was not able to inhibit the demineralizing effect of G. This high-fluoride gel induced an erosive mineral loss in combination with G. The use of ProSchmelz in combination or not with other fluoride products did not increase remineralization of specimens stored in SN or W (p > 0.05). ProSchmelz resulted in an erosion of the specimens stored in W and revealed a lower mineralized surface layer of specimens stored in SN. CONCLUSION Topical application of high-fluoride gel reduced the mineral loss induced by G but resulted in an erosion of specimens' surface. In addition, ProSchmelz did not demonstrate beneficial effects in combination with SN on subsurface dentin lesion remineralization. CLINICAL RELEVANCE Within the limitations of an in vitro study, it was concluded that the application of a high-fluoride gel did not promote additional effects on remineralization of subsurface dentin lesions in combination with saliva substitutes when compared to products with lower fluoride concentration.
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Borah BM, Halter TJ, Xie B, Henneman ZJ, Siudzinski TR, Harris S, Elliott M, Nancollas GH. Kinetics of canine dental calculus crystallization: an in vitro study on the influence of inorganic components of canine saliva. J Colloid Interface Sci 2014; 425:20-6. [PMID: 24776659 DOI: 10.1016/j.jcis.2014.03.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2013] [Revised: 03/10/2014] [Accepted: 03/13/2014] [Indexed: 01/09/2023]
Abstract
This work identifies carbonated hydroxyapatite (CAP) as the primary component of canine dental calculus, and corrects the long held belief that canine dental calculus is primarily CaCO3 (calcite). CAP is known to be the principal crystalline component of human dental calculus, suggesting that there are previously unknown similarities in the calcification that occurs in these two unique oral environments. In vitro kinetic experiments mimicking the inorganic components of canine saliva have examined the mechanisms of dental calculus formation. The solutions were prepared so as to mimic the inorganic components of canine saliva; phosphate, carbonate, and magnesium ion concentrations were varied individually to investigate the roll of these ions in controlling the nature of the phases that is nucleated. To date, the inorganic components of the canine oral systems have not been investigated at concentrations that mimic those in vivo. The mineral composition of the synthetic calculi grown under these conditions closely resembled samples excised from canines. This finding adds new information about calculus formation in humans and canines, and their sensitivity to chemicals used to treat these conditions.
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Affiliation(s)
- Ballav M Borah
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Timothy J Halter
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Baoquan Xie
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Zachary J Henneman
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Thomas R Siudzinski
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA
| | - Stephen Harris
- Waltham Centre for Pet Nutrition, Leicestershire LE14 4RT, UK
| | - Matthew Elliott
- Mars Care & Treats Europe, Oakwell Way, Birstall WF17 9LU, UK
| | - George H Nancollas
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA.
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Holt C, Lenton S, Nylander T, Sørensen ES, Teixeira SC. Mineralisation of soft and hard tissues and the stability of biofluids. J Struct Biol 2014; 185:383-96. [DOI: 10.1016/j.jsb.2013.11.009] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 11/29/2013] [Accepted: 11/30/2013] [Indexed: 02/04/2023]
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Sotres J, Barrantes A, Lindh L, Arnebrant T. Strategies for a direct characterization of phosphoproteins on hydroxyapatite surfaces. Caries Res 2013; 48:98-110. [PMID: 24296726 DOI: 10.1159/000351871] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Accepted: 05/08/2013] [Indexed: 11/19/2022] Open
Abstract
We show in this work how systems formed by phosphoproteins on calcium phosphate surfaces can be directly characterized, in real time, in liquid medium, without the need for elution or labeling. Specifically, we show how this is possible by applying three different techniques: ellipsometry, quartz crystal microbalance with dissipation, and atomic force microscopy-based friction force spectroscopy. We apply these techniques to study two different model systems, i.e. those formed upon the adsorption of two model phosphoproteins (κ- and β-casein) on hydroxyapatite (HA) surfaces. Information on the kinetics of adsorption, surface excess, viscoelasticity, water content, thickness of the layers, and protein-surface interaction is provided. Results indicate that both phosphoproteins form homogeneous elastic highly hydrated monolayers on the HA surfaces, the strength of β-casein layers being higher by approximately a factor of 4. Based on the experimental results, models for the conformation of κ- and β-casein molecules adsorbed on HA surfaces are proposed.
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Affiliation(s)
- J Sotres
- Biomedical Sciences, Faculty of Health and Society, Malmö University, Malmö, Sweden
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Brevik S, Lussi A, Rakhmatullina E. A new optical detection method to assess the erosion inhibition by in vitro salivary pellicle layer. J Dent 2013; 41:428-35. [DOI: 10.1016/j.jdent.2013.02.011] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Revised: 02/15/2013] [Accepted: 02/16/2013] [Indexed: 11/18/2022] Open
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West NX, Lussi A, Seong J, Hellwig E. Scaffold-free microtissues: differences from monolayer cultures and their potential in bone tissue engineering. Clin Oral Investig 2013; 17:9-17. [PMID: 22695872 PMCID: PMC3585766 DOI: 10.1007/s00784-012-0763-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2011] [Accepted: 05/23/2012] [Indexed: 12/16/2022]
Abstract
OBJECTIVES Cell-based therapies for bone augmentation after tooth loss and for the treatment of periodontal defects improve healing defects. Usually, osteogenic cells or stem cells are cultivated in 2D primary cultures, before they are combined with scaffold materials, even though this means a loss of the endogenous 3D microenvironment for the cells. Moreover, the use of single-cell suspensions for the inoculation of scaffolds or for the direct application into an area of interest has the disadvantages of low initial cell numbers and susceptibility to unwanted cellular distribution, respectively. MATERIALS AND METHODS We addressed the question whether an alternative to monolayer cultures, namely 3D microtissues, has the potential to improve osteogenic tissue engineering and its clinical outcome. RESULTS By contrast, to monolayer cultures, osteogenic differentiation of 3D microtissues is enhanced by mimicking in vivo conditions. It seems that the osteogenic differentiation in microtissues is enhanced by strong integrin-extracellular matrix interaction and by stronger autocrine BMP2 signaling. Moreover, microtissues are less prone to wash out by body fluids and allow the precise administration of large cell numbers. CONCLUSION Microtissue cultures have closer characteristics with cells in vivo and their enhanced osteogenic differentiation makes scaffold-free microtissues a promising concept in osteogenic tissue engineering. CLINICAL RELEVANCE Microtissues are particularly suitable for tissue engineering because they improve seeding efficiency of biomaterials by increasing the cell load of a scaffold. This results in accelerated osteogenic tissue formation and could contribute to earlier implant stability in mandibular bone augmentation.
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Affiliation(s)
- N. X. West
- />Clinical Trials Unit, Department of Oral and Dental Sciences, Bristol Dental Hospital, Lower Maudlin Street, Bristol, BS1 2LY UK
| | - A. Lussi
- />Department of Operative Dentistry, Preventive and Pediatric Dentistry, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - J. Seong
- />Clinical Trials Unit, Department of Oral and Dental Sciences, Bristol Dental Hospital, Lower Maudlin Street, Bristol, BS1 2LY UK
| | - E. Hellwig
- />Department of Operative Dentistry and Periodontology, Dental School and Hospital Dentistry, University Medical Center Freiburg, Freiburg im Breisgau, Germany
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Thanatvarakorn O, Nakashima S, Sadr A, Prasansuttiporn T, Ikeda M, Tagami J. In vitroevaluation of dentinal hydraulic conductance and tubule sealing by a novel calcium-phosphate desensitizer. J Biomed Mater Res B Appl Biomater 2012; 101:303-9. [DOI: 10.1002/jbm.b.32840] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Revised: 07/27/2012] [Accepted: 09/25/2012] [Indexed: 11/10/2022]
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Kapusetti G, Misra N, Singh V, Kushwaha RK, Maiti P. Bone cement/layered double hydroxide nanocomposites as potential biomaterials for joint implant. J Biomed Mater Res A 2012; 100:3363-73. [DOI: 10.1002/jbm.a.34296] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Revised: 05/15/2012] [Accepted: 05/22/2012] [Indexed: 11/06/2022]
Affiliation(s)
- Govinda Kapusetti
- School of Biomedical Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221 005, India
| | - Nira Misra
- School of Biomedical Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221 005, India
| | - Vakil Singh
- Department of Metallurgical Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221 005, India
| | - R. K. Kushwaha
- School of Biomedical Engineering, Institute of Technology, Banaras Hindu University, Varanasi 221 005, India
| | - Pralay Maiti
- School of Materials Science and Technology, Institute of Technology, Banaras Hindu University, Varanasi 221 005, India
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West NX, Lussi A, Seong J, Hellwig E. Scaffold-free microtissues: differences from monolayer cultures and their potential in bone tissue engineering. Clin Oral Investig 2012; 17 Suppl 1:S9-19. [PMID: 22695872 PMCID: PMC3585766 DOI: 10.1007/s00784-012-0887-x] [Citation(s) in RCA: 126] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2012] [Accepted: 11/21/2012] [Indexed: 12/13/2022]
Abstract
Objectives The paper’s aim is to review dentin hypersensitivity (DHS), discussing pain mechanisms and aetiology. Materials and methods Literature was reviewed using search engines with MESH terms, DH pain mechanisms and aetiology (including abrasion, erosion and periodontal disease). Results The many hypotheses proposed for DHS attest to our lack of knowledge in understanding neurophysiologic mechanisms, the most widely accepted being the hydrodynamic theory. Dentin tubules must be patent from the oral environment to the pulp. Dentin exposure, usually at the cervical margin, is due to a variety of processes involving gingival recession or loss of enamel, predisposing factors being periodontal disease and treatment, limited alveolar bone, thin biotype, erosion and abrasion. Conclusions The current pain mechanism of DHS is thought to be the hydrodynamic theory. The initiation and progression of DHS are influenced by characteristics of the teeth and periodontium as well as the oral environment and external influences. Risk factors are numerous often acting synergistically and always influenced by individual susceptibility. Clinical relevance Whilst the pain mechanism of DHS is not well understood, clinicians need to be mindful of the aetiology and risk factors in order to manage patients’ pain and expectations and prevent further dentin exposure with subsequent sensitivity.
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Affiliation(s)
- N. X. West
- />Clinical Trials Unit, Department of Oral and Dental Sciences, Bristol Dental Hospital, Lower Maudlin Street, Bristol, BS1 2LY UK
| | - A. Lussi
- />Department of Operative Dentistry, Preventive and Pediatric Dentistry, School of Dental Medicine, University of Bern, Bern, Switzerland
| | - J. Seong
- />Clinical Trials Unit, Department of Oral and Dental Sciences, Bristol Dental Hospital, Lower Maudlin Street, Bristol, BS1 2LY UK
| | - E. Hellwig
- />Department of Operative Dentistry and Periodontology, Dental School and Hospital Dentistry, University Medical Center Freiburg, Freiburg im Breisgau, Germany
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Praxedes-Neto OJ, Borges BCD, Florêncio-Filho C, Farias ACR, Drennan J, De Lima KC. In vivo remineralization of acid-etched enamel in non-brushing areas as influenced by fluoridated orthodontic adhesive and toothpaste. Microsc Res Tech 2012; 75:910-6. [PMID: 22298375 DOI: 10.1002/jemt.22012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Accepted: 12/18/2011] [Indexed: 11/08/2022]
Abstract
This study aimed to evaluate the in vivo remineralization of acid-etched enamel in non-brushing areas as influenced by fluoridated orthodontic adhesive and toothpaste. One hundred and twenty teeth from 30 volunteers were selected. The teeth were assigned to four treatments: no treatment (negative control); 37% phosphoric acid-etching (PAE) (positive control); PAE + resin-modified glass ionomer cement (RMGIC); and, PAE + composite resin. Patients brushed teeth with fluoridated (n = 15) or non-fluoridated (n = 15) toothpastes, so that etched enamel was protected with screens and it was not in contact with the brush bristles. Remineralization was evaluated by means of laser fluorescence (LF), environmental scanning electronic microscopy, and energy dispersive spectrometry after extraction. The LF means were compared by means of Wilcoxon and Mann Whitney tests. Environmental scanning electron microscopy scores were compared among the groups using a Kruskal Wallis test, whereas the Ca/P ratio was evaluated by means of an Analysis of Variance with subparcels (treatments) and Tukey's post-hoc test. There were no statistically significant differences between the tooth pastes and between the orthodontic adhesives evaluated. Most teeth presented only partial enamel remineralization. Therefore, the fluoride released by the RMGIC was not enough to cause increased crystal regrowth in the acid-etched enamel. The use of fluoridated toothpaste did not provide positive additional effect.
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Affiliation(s)
- Otávio José Praxedes-Neto
- Department of Dentistry, School of Dentistry, Potiguar University, Laureate International Universities, Natal, Brazil
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Abstract
The polysaccharide capsule of Streptococcus pneumoniae is a hallmark for virulence in humans. In its close relative Streptococcus mitis, a common human commensal, analysis of the sequenced genomes of six strains revealed the presence of a putative capsule locus in four of them. We constructed an isogenic S. mitis mutant from the type strain that lacked the 19 open reading frames in the capsule locus (Δcps mutant), using a deletion strategy similar to previous capsule functional studies in S. pneumoniae. Transmission electron microscopy and atomic force microscopy revealed a capsule-like structure in the S. mitis type strain that was absent or reduced in the Δcps mutant. Since S. mitis are predominant oral colonizers of tooth surfaces, we addressed the relevance of the capsule locus for the S. mitis overall surface properties, autoaggregation and biofilm formation. The capsule deletion resulted in a mutant with approximately two-fold increase in hydrophobicity. Binding to the Stains-all cationic dye was reduced by 40%, suggesting a reduction in the overall negative surface charge of the mutant. The mutant exhibited also increased autoaggregation in coaggregation buffer, and up to six-fold increase in biofilm levels. The results suggested that the capsule locus is associated with production of a capsule-like structure in S. mitis and indicated that the S. mitis capsule-like structure may confer surface attributes similar to those associated with the capsule in S. pneumoniae.
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Affiliation(s)
- H V Rukke
- Department of Oral Biology, Faculty of Dentistry, University of Oslo, Oslo, Norway.
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