1
|
Fathy Abo-Elmahasen MM, Shaaban AM, Elsaharty M, Mohamed AAS, Assadawy MI, El Sayed IS. Evaluation of the remineralizing effect of the chicken eggshell paste after removal of the fixed orthodontic appliance: An in vitro study. J Orthod Sci 2024; 13:7. [PMID: 38516108 PMCID: PMC10953725 DOI: 10.4103/jos.jos_194_23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2023] [Revised: 01/08/2024] [Accepted: 01/15/2024] [Indexed: 03/23/2024] Open
Abstract
BACKGROUND Demineralization of the enamel surface, which appears as white spot lesions during and after removal of the fixed orthodontic appliance, is the most common disadvantage of the orthodontic treatment course. Using the remineralizing agents during and after orthodontic treatment helps to avoid those enamel defects. OBJECTIVE The present study aims to assess the remineralizing effect of the chicken eggshell powder on the demineralized enamel surfaces after debonding the orthodontic bracket system. MATERIALS AND METHODS The current study was performed on 80 prepared premolar crowns embedded into acrylic molds. The samples were prepared to receive routine steps of the bonding process for the bracket system. The paste of the chicken eggshell powder was added to the samples after the debonding process. Scanning electron microscopy (SEM) and energy-dispersive X-ray (EDX) were used to evaluate the remineralization effect of the chicken eggshell powder. Also, the Vickers microhardness tester was used to assess the enamel surface microhardness. RESULTS It was found that the mean value of the Ca/P ratio for the samples before bonding of the orthodontic bracket system was (4.17 ± 2.2). This value significantly decreased to (2 ± 1.3) after debonding of the orthodontic bracket system and then showed a significant increase to (4.79 ± 2.65) after remineralization. These results were assured by the values of the Vickers microhardness tester. CONCLUSION The chicken eggshell powder has an excellent remineralization effect for the demineralized enamel surface after debonding the orthodontic enamel surface.
Collapse
Affiliation(s)
| | - Adel M. Shaaban
- Department of Dental Biomaterials, Faculty of Dental Medicine, (Cairo, Boys), Al-Azhar University, Cairo, Egypt
| | - Mohamed Elsaharty
- Department of Orthodontics, Faculty of Dentistry, Tanta University, Tanta, Gharbia Governorate, Egypt
| | - Ahmed A. S. Mohamed
- Department of Orthodontics, Faculty of Dentistry, Menofia University, Shibin el Kom, Menofia Governorate, Egypt
| | - Mohamed I. Assadawy
- Department of Oral Medicine, Periodontology, Oral Diagnosis and Oral Radiology, Faculty of Dental Medicine, (Cairo, Boys), Al-Azhar University, Cairo, Egypt
| | - Ibrahim Sabry El Sayed
- Department of Oral Medicine, Periodontology, Oral Diagnosis and Oral Radiology, Faculty of Dental Medicine, (Cairo, Boys), Al-Azhar University, Cairo, Egypt
| |
Collapse
|
2
|
Nishna T, Adyanthaya A, Johnson AM, Venugopal J, Venugopal M, Anju RV. Estimation of the Efficacy of Remineralizing Agents on the Microhardness of Deciduous Teeth Demineralized Using Pediatric Formulations. J Contemp Dent Pract 2023; 24:325-336. [PMID: 38149811 DOI: 10.5005/jp-journals-10024-3505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2023]
Abstract
AIM This study aimed to evaluate the demineralizing effect of commonly used pediatric syrup formulations on primary teeth and the efficacy of two readily available remineralizing agents in treating this effect. MATERIALS AND METHODS Ninety primary teeth were used for sample preparation and divided into three groups: antibiotic syrup (group A), cough syrup (group B), and control (group C) groups. These groups were further categorized into intragroups according to the treatment with remineralizing agents: groups A1, B1, and C1 received GC Tooth Mousse (casein phosphopeptide-amorphous calcium phosphate, CPP-ACP paste) and groups A2, B2, and C2 received Clinpro Tooth Crème. The samples were subjected to a series of demineralization cycles for 14 days, and remineralization cycles until 30 days were performed using two remineralizing agents, that is, GC Tooth Mousse (CPP-ACP paste) and Clinpro Tooth Crème and were evaluated using Vicker's microhardness test. RESULTS Antibiotic syrup (group A) and cough syrup (group B) showed a significant decrease in surface microhardness compared with control (group C). All intragroups showed an increase in surface microhardness after treatment with remineralizing agents, which was significantly higher in intragroups A1, B1, and C1 treated with GC Tooth Mousse (CPP-ACP paste). CONCLUSIONS Oral liquid medications showed definite demineralization potential. CPP-ACP paste was found to be better than Clinpro Tooth Crème for demineralized teeth. CLINICAL SIGNIFICANCE The use of over-the-counter drugs has increased among the average Indian population, especially for the treatment of fever, cold, and cough. Unwise use of medications by the present population without proper medical guidance will lead to irreparable changes in future generations.
Collapse
Affiliation(s)
- T Nishna
- Department of Pediatric and Preventive Dentistry, Amrita School Dentistry, Amrita Vishwa Vidyapeetham, Kochi, Kerala, India, Phone: +91 8606853358, e-mail: , Orcid: https://orcid.org/0000-0003-1264-501X
| | - Amith Adyanthaya
- Department of Pediatric and Preventive Dentistry, KMCT Dental College, Kozhikode, Kerala, India
| | - Ann Meera Johnson
- Department of Pediatric and Preventive Dentistry, Educare Institute of Dental Sciences, Malappuram, Kerala, India
| | - Jipsa Venugopal
- Department of Pediatric and Preventive Dentistry, Sree Anjaneya Institute of Dental Sciences, Calicut, Kerala, India
| | - Malini Venugopal
- Department of Pediatric and Preventive Dentistry, Amrita School of Dentistry, Amrita Vishwa Vidyapeetham, Kochi, Kerala, India, Orcid: https://orcid.org/0000-0002-2485-1809
| | - R V Anju
- Department of Pediatric and Preventive Dentistry, KMCT Dental College, Kozhikode, Kerala, India, Orcid: https://orcid.org/0000-0002-1768-3413
| |
Collapse
|
3
|
Kakkar M, Kapoor V, Singla SK, Jethi RK. Fluoride and Biological Mineralization II: Mechanism of Action of Fluoride to Influence the Collagen-Induced In Vitro Mineralization and Demineralization Reactions. Biol Trace Elem Res 2021; 199:4145-4153. [PMID: 33660200 DOI: 10.1007/s12011-020-02544-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 12/13/2020] [Indexed: 11/29/2022]
Abstract
Fluoride had been shown to inhibit collagen-induced in vitro mineralization without affecting demineralization at its lower concentrations (> 1X10-5 and < 1X10-4 M) and stimulate mineralization in addition to inhibiting demineralization at its concentration > 1X10-4 M. The present studies were designed to investigate the mechanism by which fluoride acts to produce these concentration-dependent effects. The inhibition of mineralization occurring at the lower concentrations of fluoride was found to be due to the inactivation of the specific calcium binding sites of collagen involved in initiating the process of mineralization. Stimulation of mineralization obtained at the higher concentrations of fluoride was found to be due to the activation of the specific phosphate-binding sites of the collagen and the formation of a relatively less soluble and highly stable fluorapatite instead of hydroxyapatite. At its higher concentrations, fluoride was also found to inhibit demineralization by binding to the mineral phase associated with collagen. A model has been presented to explain the mechanisms whereby fluoride may act to produce the above observed effects.
Collapse
Affiliation(s)
- Monica Kakkar
- Department of Biochemistry, NRI Medical College and General Hospital, Chinakakani, Mangalagiri Mandal, Guntur District, Andhra Pradesh, 522503, India.
| | - Vivek Kapoor
- Dr Harvansh Singh Judge Institute of Dental Sciences & Hospital, Panjab University, Chandigarh, 160014, India
| | | | - Raj Kumar Jethi
- Department of Biochemistry, Panjab University, Chandigarh, 160014, India
| |
Collapse
|
4
|
Kao YH, Igarashi N, Abduweli Uyghurturk D, Li Z, Zhang Y, Ohshima H, MacDougall M, Takano Y, Den Besten P, Nakano Y. Fluoride Alters Signaling Pathways Associated with the Initiation of Dentin Mineralization in Enamel Fluorosis Susceptible Mice. Biol Trace Elem Res 2021; 199:3021-3034. [PMID: 33113116 DOI: 10.1007/s12011-020-02434-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 10/11/2020] [Indexed: 12/21/2022]
Abstract
Fluoride can alter the formation of mineralized tissues, including enamel, dentin, and bone. Dentin fluorosis occurs in tandem with enamel fluorosis. However, the pathogenesis of dentin fluorosis and its mechanisms are poorly understood. In this study, we report the effects of fluoride on the initiation of dentin matrix formation and odontoblast function. Mice from two enamel fluorosis susceptible strains (A/J and C57BL/6J) were given either 0 or 50 ppm fluoride in drinking water for 4 weeks. In both mouse strains, there was no overall change in dentin thickness, but fluoride treatment resulted in a significant increase in the thickness of the predentin layer. The lightly mineralized layer (LL), which lies at the border between predentin and fully mineralized dentin and is associated with dentin phosphoprotein (DPP), was absent in fluoride exposed mice. Consistent with a possible reduction of DPP, fluoride-treated mice showed reduced immunostaining for dentin sialoprotein (DSP). Fluoride reduced RUNX2, the transcription regulator of dentin sialophosphoprotein (DSPP), that is cleaved to form both DPP and DSP. In fluoride-treated mouse odontoblasts, the effect of fluoride was further seen in the upstream of RUNX2 as the reduced nuclear translocation of β-catenin and phosphorylated p65/NFκB. In vitro, MD10-F2 pre-odontoblast cells showed inhibition of the Dspp mRNA level in the presence of 10 μM fluoride, and qPCR analysis showed a significantly downregulated level of mRNAs for RUNX2, β-catenin, and Wnt10b. These findings indicate that in mice, systemic exposure to excess fluoride resulted in reduced Wnt/β-catenin signaling in differentiating odontoblasts to downregulate DSPP production via RUNX2.
Collapse
Affiliation(s)
- Yu-Hsing Kao
- Department of Orofacial Sciences, School of Dentistry, University of California San Francisco, San Francisco, USA
| | - Nanase Igarashi
- Department of Orofacial Sciences, School of Dentistry, University of California San Francisco, San Francisco, USA
| | - Dawud Abduweli Uyghurturk
- Division of Anatomy and Cell Biology of the Hard Tissue, Department of Tissue Regeneration and Reconstruction, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Zhu Li
- Department of Orofacial Sciences, School of Dentistry, University of California San Francisco, San Francisco, USA
| | - Yan Zhang
- Department of Orofacial Sciences, School of Dentistry, University of California San Francisco, San Francisco, USA
- Center for Children's Oral Health Research, School of Dentistry, University of California San Francisco, San Francisco, USA
| | - Hayato Ohshima
- Division of Anatomy and Cell Biology of the Hard Tissue, Department of Tissue Regeneration and Reconstruction, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Japan
| | - Mary MacDougall
- Faculty of Dentistry, The University of British Columbia, Vancouver, Canada
| | - Yoshiro Takano
- Biostructural Science, Graduate School of Tokyo Medical and Dental University, Tokyo, Japan
| | - Pamela Den Besten
- Department of Orofacial Sciences, School of Dentistry, University of California San Francisco, San Francisco, USA
- Center for Children's Oral Health Research, School of Dentistry, University of California San Francisco, San Francisco, USA
| | - Yukiko Nakano
- Department of Orofacial Sciences, School of Dentistry, University of California San Francisco, San Francisco, USA.
- Center for Children's Oral Health Research, School of Dentistry, University of California San Francisco, San Francisco, USA.
| |
Collapse
|
5
|
Comprehensive Management of Severe Dental Fluorosis with Adhesively Bonded All-Ceramic Restorations. PROSTHESIS 2021. [DOI: 10.3390/prosthesis3030020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Dental fluorosis is a common disorder caused by excessive fluoride intake during tooth development. The esthetic consequences of dental fluorosis can negatively affect oral health-related quality of life and have lasting psychosocial effects. In severe cases, where the fluorosed enamel is prone to chipping, flaking, and developing caries, minimally invasive procedures are ineffectual and a more substantial restorative approach is required to restore optimal function and esthetics. However, no definitive guidelines exist for the management and treatment of severe dental fluorosis due to the limited evidence available in the literature. This case report describes the full-mouth rehabilitation of a patient with severe dental fluorosis utilizing adhesively bonded all-ceramic crowns, veneers, and overlays. The successful follow-up on this case indicates that adhesively bonded restorations may provide a viable option in the functional and esthetic management of severely fluorosed dentition.
Collapse
|
6
|
Kakkar M, Kapoor V, Singla SK, Jethi RK. Fluoride and Biological Calcification I: Effect of Fluoride on Collagen-Induced In Vitro Mineralization and Demineralization Reactions. Biol Trace Elem Res 2021; 199:2208-2214. [PMID: 32856250 DOI: 10.1007/s12011-020-02340-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2020] [Accepted: 08/09/2020] [Indexed: 11/28/2022]
Abstract
An in vitro system employing collagen isolated from the sheep tendons to induce mineralization and demineralization reactions was used not only to study the effect of various concentrations of fluoride on the collagen-induced mineralization and demineralization reactions but also to compare their action with the inhibitors of mineralization and/or demineralization. Studies demonstrated that under physiological conditions, at lower concentrations (5 × 10-6 to 5 × 10-5 M) fluoride inhibited while at higher concentrations (> 10-4 M), it stimulated the collagen-induced in vitro mineralization. At higher concentrations, fluoride was also found to inhibit the demineralization of the collagen bound preformed mineral phase. At low concentrations, fluoride acted like Mg2+ to inhibit mineralization while at higher concentration, it acted like crystal poisons (e.g., pyrophosphate phosphonates, citrate) to inhibit demineralization. However, unlike magnesium and pyrophosphate, fluoride at its higher concentrations was found to stimulate rather than inhibit the process of mineralization.
Collapse
Affiliation(s)
- Monica Kakkar
- Department of Biochemistry, NRI Medical College and General Hospital, Mangalagiri Mandal, Guntur District, Chinakakani, Andhra Pradesh, 522503, India.
| | - Vivek Kapoor
- Dr. Harvansh Singh Judge Institute of Dental Sciences & Hospital, Panjab University, Chandigarh, 160014, India
| | - S K Singla
- Department of Biochemistry, Panjab University, Chandigarh, 160014, India
| | - R K Jethi
- Department of Biochemistry, Panjab University, Chandigarh, 160014, India
| |
Collapse
|
7
|
Kulkarni S, Mustafa M, Ghatole K, AlQahtani AR, I Asiri FY, Alghomlas ZI, Alothman TA, Alhajri FF. Evaluation of 2% Chlorhexidine and 2% Sodium Fluoride as Endodontic Irrigating Solutions on Root Dentine Microhardness: An In Vitro Study. Eur J Dent 2020; 15:253-258. [PMID: 33032334 PMCID: PMC8184278 DOI: 10.1055/s-0040-1717053] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
Objectives
The aim of this study was to evaluate the effects of 2% chlorhexidine gluconate (CHG) and 2% sodium fluoride (NaF) as endodontic irrigants on microhardness of root dentin.
Materials and Methods
In this
in vitro
study, access cavity and root canal preparations were done on 24 freshly extracted anterior teeth. After sectioning into 24 dentin discs using hard tissue microtome in 2 mm thickness, all samples were immersed in solutions of 17% ethylenediamine tetra-acetic acid (EDTA) (2 minutes) followed by 2.5% of sodium hypochlorite (NaOCl) (10 minutes). Then samples were randomly divided into three groups based on the irrigant used: Group I: saline (control group); Group II: 2% NaF; Group III: 2% CHG for two minutes each. Dentin microhardness was measured before (pretreatment), during (after treatment with 17% EDTA and 2.5% NaOCl), and after the experimental period (after treatment with saline, 2% NaF, and 2% CHG) using a Vickers indenter. Statistical evaluation of the data was done using one-way analysis of variance (ANOVA) and the Student’s
t
-test, and the values are tabulated.
Results
Specimens rinsed in 2% CHG showed a significant increase in Vickers hardness number (VHN) values (
p
< 0.05), as compared with EDTA and NaOCl groups, whereas saline and 2% NaF groups showed no significant difference.
Conclusions
NaF did not show any significant effect on microhardness of the root dentin. CHG as an irrigant was seen to have a strengthening effect on dentin microhardness in comparison to NaOCl and EDTA, which has decreased the strength of root dentin.
Collapse
Affiliation(s)
- Sangeeta Kulkarni
- Department of Conservative Dentistry and Endodontics, Al-Badar Dental College and Hospital, Kalaburagi, Karnataka, India
| | - Mohammed Mustafa
- Department of Conservative Dental Sciences, College of Dentistry, Prince Sattam bin Abdulaziz University, Al-Kharj, Saudi Arabia
| | - Kiran Ghatole
- Department of Conservative Dentistry and Endodontics, Al-Badar Dental College and Hospital, Kalaburagi, Karnataka, India
| | - Ali Robaian AlQahtani
- Department of Conservative Dental Sciences, College of Dentistry, Prince Sattam bin Abdulaziz University, Al-Kharj, Saudi Arabia
| | - Faris Yahya I Asiri
- Department of Preventive Dental Sciences, College of Dentistry, King Faisal University, Al-Ahsa, Saudi Arabia
| | | | | | | |
Collapse
|
8
|
Shear Bond Strength of Three Composite Resins to Fluorosed and Sound Dentine: In Vitro Study. Int J Dent 2020; 2020:4568568. [PMID: 32351568 PMCID: PMC7171611 DOI: 10.1155/2020/4568568] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 03/09/2020] [Accepted: 03/23/2020] [Indexed: 11/18/2022] Open
Abstract
Introduction This in vitro study compared the shear strength of three composite resin systems to fluorosed and normal dentin. Methods Silorane FiltekTM P90, FiltekTMZ250 XT in combination with the adhesive system AdperTM Single bond 2, and Amelogen® Plus in association with Peak Universal Bond® were tested. Fifteen normal and 15 fluorosed dentine disks were prepared per material. The shear bond strength test was performed using a universal machine. Results One-way ANOVA revealed significant differences in bond strength between the tested composite resins. All tested materials had significantly different adhesion at the fluorosed and the nonfluorosed interface. FiltekTM Z250 XT and Silorane had lower adhesion values to fluorosed than to normal dentin. In contrast, Amelogen® Plus presented a better average resistance at the fluorosed interface. Conclusion Amelogen® Plus presented a better average shear bond strength on the fluorosed dentine. FiltekTMZ250 XT showed the best adhesion forces and shear bond strength with sound dentine. Further studies are needed to better understand the sealing of these systems.
Collapse
|
9
|
Malentacca A, Lajolo C. A new technique to make transparent teeth without decalcifying: description of the methodology and micro-hardness assessment. Ann Anat 2014; 197:11-5. [PMID: 25466932 DOI: 10.1016/j.aanat.2014.10.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 09/25/2014] [Accepted: 10/20/2014] [Indexed: 11/17/2022]
Abstract
Diaphanisation and other in vitro endodontic models (i.e., plastic blocks, micro-CT reconstruction, computerised models) do not recreate real root canal working conditions: a more realistic endodontic model is essential for testing endodontic devices and teaching purposes. The aim of this study was to describe a new technique to construct transparent teeth without decalcifying and evaluate the micro-hardness of so treated teeth. Thirty freshly extracted teeth were randomly divided into three groups as follows: 10 non-treated teeth (4 molars, 3 premolars, 3 incisors; control group - G1), 10 teeth were diaphanised (4 molars, 4 premolars, 2 incisors - G2) and 10 teeth were treated with the new proposed technique (2 molars, 6 premolars, 2 incisors - G3). Vickers hardness tester (MHT-4 and AxioVision microscope, Carl Zeiss, 37030 Gottingen, Germany - load=50 g, dwell time=20s, slope=5, 50× magnification) was used to determine microhardness (Vickers Hardness Number - VHN). Statistical analysis was performed using the Intercooled Stata 8.0 software (Stata Corporation, College Station, TX, USA). Only groups 1 and 3 could be tested for hardness because diaphanised teeth were too tender and elastic. Differences in enamel VHN were observed between G1 (mean 304.29; DS=10.44; range 283-321) and G3 (mean 318.51; DS=14.36; range 295.5-339.2) - (p<0.05); differences in dentine VHN were observed between G1 (mean 74.73; DS=6.62; range 63.9-88.1) and G3 (mean 64.54; DS=5.55; range 51.2-72.3) - (p<0.05). G3 teeth presented a slightly lower VHN compared to G1, probably due to some little structural differences among groups, and were dramatically harder than the diaphanised teeth. The described technique, thus, can be considered ideal for testing endodontic instruments and for teaching purposes.
Collapse
Affiliation(s)
| | - Carlo Lajolo
- Oral Pathology and Medicine, Catholic University, Largo F. Vito, 1, I-00168 Rome, Italy.
| |
Collapse
|
10
|
FAN HONGYI, GAO SHANSHAN, LIU YANG, ZHU ZHUOLI, YU HAIYANG. THE MICROMECHANICAL AND TRIBOLOGICAL FEATURE OF MILD MOTTLED ENAMEL. J MECH MED BIOL 2014. [DOI: 10.1142/s021951941450050x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The relationships between the basic mechanical and wear properties of mottled enamel, especially during the mastication process, are important factors and must be explored. This study evaluated mottled enamel's micro-tribological behavior under artificial saliva conditions in vitro. The basic mechanical properties were determined by nanoindentiation testing. A conical diamond nanoindenter tip was used to scratch mottled enamel and normal enamel. The scratches were sliding with a constant normal load of 2 mN, with different cycles during the tests. The hardness, elastic modulus and friction coefficient were obtained to analyze the mechanical properties. The results showed that the hardness and elastic modulus of mottled enamel were 10% and 14.6% less, respectively, than those of normal enamel. Mottled enamel showed a lower friction coefficient and a higher wear rate, compared to normal enamel. The friction coefficient did not appear to be related to the wear rate for either type of enamel. The wear mechanism for normal enamel was plastic deformation for early wear, while the combination of plastic deformation and delamination was the main damage feature of mottled enamel.
Collapse
Affiliation(s)
- HONGYI FAN
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, NO. 14, 3rd Section of Ren Min Nan Road, Chengdu, P. R. China
| | - SHANSHAN GAO
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, NO. 14, 3rd Section of Ren Min Nan Road, Chengdu, P. R. China
| | - YANG LIU
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, NO. 14, 3rd Section of Ren Min Nan Road, Chengdu, P. R. China
| | - ZHUOLI ZHU
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, NO. 14, 3rd Section of Ren Min Nan Road, Chengdu, P. R. China
| | - HAIYANG YU
- State Key Laboratory of Oral Diseases, West China Hospital of Stomatology, Sichuan University, NO. 14, 3rd Section of Ren Min Nan Road, Chengdu, P. R. China
| |
Collapse
|
11
|
Effect of open-sandwich vs. adhesive restorative techniques on enamel and dentine demineralization: An in situ study. J Dent 2013; 41:872-80. [DOI: 10.1016/j.jdent.2013.07.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2013] [Revised: 07/03/2013] [Accepted: 07/05/2013] [Indexed: 11/17/2022] Open
|
12
|
Russo L, Gloria A, Russo T, D'Amora U, Taraballi F, De Santis R, Ambrosio L, Nicotra F, Cipolla L. Glucosamine grafting on poly(ε-caprolactone): a novel glycated polyester as a substrate for tissue engineering. RSC Adv 2013. [DOI: 10.1039/c3ra40408k] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
|
13
|
MacKenzie CSK, Clough MJ, Broders HG, Tubrett M. Chemical and structural composition of Atlantic Canadian moose (Alces alces) incisors with patterns of high breakage. THE SCIENCE OF THE TOTAL ENVIRONMENT 2011; 409:5483-5492. [PMID: 21945187 DOI: 10.1016/j.scitotenv.2011.08.066] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2011] [Revised: 08/24/2011] [Accepted: 08/25/2011] [Indexed: 05/31/2023]
Abstract
Analysis of mammalian teeth can provide information regarding local environmental conditions. For example, a high incidence of breakage and wear within a population may indicate poor food quality. Individuals consuming a diet causing high mechanical stress on their teeth, and/or lacking the appropriate minerals for proper development, could experience degradation of tooth condition. Previously, we documented a high rate of incisor tooth breakage, with age, in two genetically distinct moose populations in Atlantic Canada. In this study, multi-element (11B, 63Cu, 64Zn, 75As, 85Rb, 88Sr, 111Cd, 118Sn, 137Ba, 208Pb, 232Th, and 238U) analyses using laser ablation ICP-MS were performed on moose incisors from multiple North American regions. The purpose was to determine whether the elemental composition of moose incisors varies among regions, and whether that variation is related to tooth degradation among Atlantic Canadian populations. A principal components analysis revealed that nearly 50% of the elemental variation in the inner enamel matrix of moose teeth was explained by three groupings of elements. The element groupings revealed differences among geographic regions, but did not explain the variation between incisors that were broken and those that were not. Regression models indicate that the elemental group which includes Cu, Pb, and Zn is related to decreases in incisal integrity. It is likely that other environmental factors contribute to the occurrence of increased incisor breakage in affected populations. The relationship between food resource quantity and quality, as a function of moose density, is hypothesized to explain loss of tooth integrity.
Collapse
|
14
|
Dorozhkin SV. Calcium orthophosphates: occurrence, properties, biomineralization, pathological calcification and biomimetic applications. BIOMATTER 2011; 1:121-64. [PMID: 23507744 PMCID: PMC3549886 DOI: 10.4161/biom.18790] [Citation(s) in RCA: 145] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The present overview is intended to point the readers' attention to the important subject of calcium orthophosphates. This type of materials is of special significance for human beings, because they represent the inorganic part of major normal (bones, teeth and antlers) and pathological (i.e., those appearing due to various diseases) calcified tissues of mammals. For example, atherosclerosis results in blood vessel blockage caused by a solid composite of cholesterol with calcium orthophosphates, while dental caries and osteoporosis mean a partial decalcification of teeth and bones, respectively, that results in replacement of a less soluble and harder biological apatite by more soluble and softer calcium hydrogenphosphates. Therefore, the processes of both normal and pathological calcifications are just an in vivo crystallization of calcium orthophosphates. Similarly, dental caries and osteoporosis might be considered an in vivo dissolution of calcium orthophosphates. Thus, calcium orthophosphates hold a great significance for humankind, and in this paper, an overview on the current knowledge on this subject is provided.
Collapse
|
15
|
Richter H, Kierdorf U, Richards A, Melcher F, Kierdorf H. Fluoride concentration in dentine as a biomarker of fluoride intake in European roe deer (Capreolus capreolus) – An electron-microprobe study. Arch Oral Biol 2011; 56:785-92. [DOI: 10.1016/j.archoralbio.2011.01.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2010] [Revised: 01/05/2011] [Accepted: 01/11/2011] [Indexed: 10/18/2022]
|
16
|
Naumova E, Gaengler P, Zimmer S, Arnold W. Influence of individual saliva secretion on fluoride bioavailability. Open Dent J 2010; 4:185-90. [PMID: 21221176 PMCID: PMC3018097 DOI: 10.2174/1874210601004010185] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2010] [Revised: 07/09/2010] [Accepted: 07/13/2010] [Indexed: 11/22/2022] Open
Abstract
UNLABELLED The aim of this preliminary investigation was to compare the individual saliva secretion rate with the fluoride bioavailability in saliva after using sodium fluoride and amine fluoride. METHODS To assess oral fluoride kinetics 10 highly trained volunteers brushed their teeth with one of the formulations and saliva was collected. The amount of saliva was measured, and the fluoride content was determined. Data underwent statistical analysis using the Mann-Whitney-U test and Pearson correlation. The ex vivo experiment I included individual saliva collection of the same volunteers. Then the oral hygiene products were solved in equal amounts of whole saliva (ex-vivo experiment II), and the fluoride content was measured. Finally, both products were dispersed in distilled water (ex-vivo experiment III) to calculate the dissociation of both products in water. RESULTS In vivo results of fluoride content after 3 min. tooth brushing demonstrated a negative correlation with saliva secretion: for NaF r = -0.695 (p<0.01) and for amine fluoride r = -0.446 (p<0.01). The in-vitro experiment I resulted for NaF in 251.7±22.4 µg/g fluoride and for amine fluoride in 171.7±14.4 µg/g. CONCLUSIONS Fluoride bioavailability of saliva after exposure to NaF was higher compared to amine fluoride. The individual secretion rate changes the fluoride content and normal secretors keep the fluoride availability longer.
Collapse
Affiliation(s)
| | | | | | - W.H Arnold
- Department für Zahn-, Mund- und Kieferheilkunde, Universität Witten/Herdecke, Alfred Herrhausen Strasse 50, 58448 Witten, Germany
| |
Collapse
|
17
|
Kirsten GA, Takahashi MK, Rached RN, Giannini M, Souza EM. Microhardness of dentin underneath fluoride-releasing adhesive systems subjected to cariogenic challenge and fluoride therapy. J Dent 2010; 38:460-8. [DOI: 10.1016/j.jdent.2010.02.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2009] [Revised: 02/19/2010] [Accepted: 02/22/2010] [Indexed: 11/17/2022] Open
|
18
|
Abstract
The present overview is intended to point the readers’ attention to the important subject of calcium orthophosphates. These materials are of the special significance because they represent the inorganic part of major normal (bones, teeth and dear antlers) and pathological (i.e. those appearing due to various diseases) calcified tissues of mammals. Due to a great chemical similarity with the biological calcified tissues, many calcium orthophosphates possess remarkable biocompatibility and bioactivity. Materials scientists use this property extensively to construct artificial bone grafts that are either entirely made of or only surface-coated with the biologically relevant calcium ortho-phosphates. For example, self-setting hydraulic cements made of calcium orthophosphates are helpful in bone repair, while titanium substitutes covered by a surface layer of calcium orthophosphates are used for hip joint endoprostheses and as tooth substitutes. Porous scaffolds made of calcium orthophosphates are very promising tools for tissue engineering applications. In addition, technical grade calcium orthophosphates are very popular mineral fertilizers. Thus ere calcium orthophosphates are of great significance for humankind and, in this paper, an overview on the current knowledge on this subject is provided.
Collapse
|
19
|
Boivin G, Bala Y, Doublier A, Farlay D, Ste-Marie LG, Meunier PJ, Delmas PD. The role of mineralization and organic matrix in the microhardness of bone tissue from controls and osteoporotic patients. Bone 2008; 43:532-8. [PMID: 18599391 DOI: 10.1016/j.bone.2008.05.024] [Citation(s) in RCA: 122] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2008] [Revised: 05/27/2008] [Accepted: 05/28/2008] [Indexed: 11/24/2022]
Abstract
Degree of mineralization of bone (DMB) is a major intrinsic determinant of bone strength at the tissue level but its contribution to the microhardness (Vickers indentation) at the intermediary level of organization of bone tissue, i.e., Bone Structural Units (BSUs), has never been assessed. The purpose of this study was to analyze the relationship between the microhardness, the DMB and the organic matrix, measured in BSUs from human iliac bone biopsies. Iliac bone samples from controls and osteoporotic patients (men and women), embedded in methyl methacrylate, were used. Using a Vickers indenter, microhardness (kg/mm2) was measured, either globally on surfaced blocks or focally on 100 microm-thick sections from bone samples (load of 25 g applied during 10 sec; CV=5%). The Vickers indenter was more suited than the Knoop indenter for a tissue like bone in which components are diversely oriented. Quantitative microradiography performed on 100 microm-thick sections, allowed measurement of parameters reflecting the DMB (g/cm3). Assessed on the whole bone sample, both microhardness and DMB were significantly lower (-10% and -7%, respectively) in osteoporotic patients versus controls (p<0.001). When measured separately at the BSU level, there were significant positive correlations between microhardness and DMB in controls (r2=0.36, p<0.0001) and osteoporotic patients (r2=0.43, p<0.0001). Mineralization is an important determinant of the microhardness, but did not explain all of its variance. To highlight the role of the organic matrix in bone quality, microhardness of both osteoid and adjacent calcified matrix were measured in iliac samples from subjects with osteomalacia. Microhardness of organic matrix is 3-fold lower than the microhardness of calcified tissue. In human calcanei, microhardness was significantly correlated with DMB (r2=0.33, p=0.02) and apparent Young's modulus (r2=0.26, p=0.03). In conclusion, bone microhardness measured by Vickers indentation is an interesting methodology for the evaluation of bone strength and its determinants at the BSU level. Bone microhardness is linked to Young's modulus of bone and is strongly correlated to mineralization, but the organic matrix accounts for about one third of its variance.
Collapse
Affiliation(s)
- G Boivin
- INSERM Unité 831, Université de Lyon, Faculté de Médecine R. Laennec, Lyon, France.
| | | | | | | | | | | | | |
Collapse
|
20
|
Suárez P, Quintana MC, Hernández L. Determination of bioavailable fluoride from sepiolite by “in vivo” digestibility assays. Food Chem Toxicol 2008; 46:490-3. [PMID: 17905503 DOI: 10.1016/j.fct.2007.08.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2006] [Revised: 06/12/2007] [Accepted: 08/13/2007] [Indexed: 10/22/2022]
Abstract
This work presents a study of the bioavailability and distribution of fluoride in tissues of animals (Wistar rats) which were fed with a poultry feeding that contains sepiolite as an additive. The determination of fluoride concentration was carried out by potentiometric measurements using a fluoride selective electrode. The quantification was done using the standard addition method with enough accuracy and precision in all the assays. The results demonstrate that fluoride present in sepiolite is not bioavailable. The digestion process does not extract all the fluoride from sepiolite, so sepiolite can be use in poultry feedings without any risk. These studies have contributed to the discussions at EU level about extraction procedures and F(-) determination in feed material of mineral origin.
Collapse
Affiliation(s)
- P Suárez
- Departamento de Química Analítica y Análisis Instrumental, Facultad de Ciencias, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, España, Spain
| | | | | |
Collapse
|
21
|
QUINTANA C, SUÁREZ P, HERNÁNDEZ L. An Electrochemical Method for Fluoride Analysis Based on a Naphthalene Urea Derivative as a Selective Receptor. ANAL SCI 2008; 24:1081-5. [DOI: 10.2116/analsci.24.1081] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Carmen QUINTANA
- Departamento de Química Analitica y Análisis Instrumental, Facultad de Ciencias, Universidad Autónoma de Madrid
| | - Patricia SUÁREZ
- Departamento de Química Analitica y Análisis Instrumental, Facultad de Ciencias, Universidad Autónoma de Madrid
| | - Lucas HERNÁNDEZ
- Departamento de Química Analitica y Análisis Instrumental, Facultad de Ciencias, Universidad Autónoma de Madrid
| |
Collapse
|
22
|
Rojas-Sánchez F, Alaminos M, Campos A, Rivera H, Sánchez-Quevedo MC. Dentin in severe fluorosis: a quantitative histochemical study. J Dent Res 2007; 86:857-61. [PMID: 17720855 DOI: 10.1177/154405910708600910] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Dentin responds to different alterations in the enamel with hypermineralization, and is a biomarker of fluoride exposure. We hypothesized that severe fluorosis would lead to hypermineralization of the dentin when the enamel was severely affected. We used scanning electron microscopy and quantitative electron-probe microanalysis to compare dentin and enamel from healthy and fluorotic teeth. The dentin in fluorotic teeth was characterized by a highly mineralized sclerotic pattern, in comparison with control teeth (p < 0.001) and fluorotic enamel lesions (p < 0.001). Enamel near the lesions showed hypercalcification in comparison with dentin (p < 0.001). In response to the effects of severe fluorosis in the enamel, the dentin showed hypermineralization, as found in other enamel disorders. The hypermineralization response of the dentin in our samples suggests that the mechanism of the response should be taken into account in dental caries and other dental disorders associated with severe fluorosis.
Collapse
Affiliation(s)
- F Rojas-Sánchez
- Instituto de Investigaciones Odontológicas Raúl Vincentelli, Facultad de Odontología, Universidad Central de Venezuela, Caracas, Venezuela
| | | | | | | | | |
Collapse
|
23
|
Li H, Watson TF, Sherriff M, Curtis R, Bartlett DW. The Influence of Fluoride Varnish on the Attrition of Dentine. Caries Res 2007; 41:219-22. [PMID: 17426403 DOI: 10.1159/000099322] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2006] [Accepted: 11/24/2006] [Indexed: 11/19/2022] Open
Abstract
Previous investigations have shown the potential for fluoride to be protective in an abrasion/erosion laboratory model. The aim of this study was to investigate the effect of high concentrations of fluoride delivered in a varnish on attrition of dentine. Fifteen caries-free, intact lower third molar teeth were sectioned and the enamel removed by a water-cooled diamond disc. Polished dentine surfaces were divided into 8 areas, 4 of which were randomly covered with a high-concentration fluoride varnish for 24 h. The samples were subjected to 5,000 cycles of attrition bathed under artificial saliva. Microhardness testing adjacent to the wear scars showed no statistical difference between the fluoride-treated (71.42 KHN, SD 10.52) and control surfaces (72.66 KHN, SD 9.69). The volume of the wear scar was statistically greater for the fluoride-treated surface at 9.6 microm(3) (SD 4.92) and 8.13 microm(3) (SD 5.54) for the control areas (p = 0.029). The low pH of the fluoride varnish appears to have increased the amount of wear from attrition in this laboratory study.
Collapse
Affiliation(s)
- H Li
- Department of TMJ (Orthodontics), West China College of Stomatology, Sichuan University, Chengdu, China
| | | | | | | | | |
Collapse
|
24
|
Limeback H, Vieira APGF, Lawrence H. Improving esthetically objectionable human enamel fluorosis with a simple microabrasion technique. Eur J Oral Sci 2006; 114 Suppl 1:123-6; discussion 127-9, 380. [PMID: 16674673 DOI: 10.1111/j.1600-0722.2006.00317.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Mild-to-moderately severe enamel fluorosis (EF) is an unsightly maturation-phase dental disorder. Despite extensive epidemiological studies on EF, little is known about individual treatment options. This study was carried out to determine whether a simple microabrasion technique is effective in improving the esthetics of EF. Patients with a variety of severities were treated using a water-cooled fine diamond polishing bur at high speed to remove the surface enamel layers. Photographs of the affected teeth before and after treatment were shown by computer to a panel of three judges (two lay and one experienced), who rated the appearance of the teeth using a newly developed visual analog scale. The severity of EF was rated randomly and blind for 52 individual teeth (26 before and 26 after treatment). Reteated-measures analysis of variance was used to analyze the results. The lay judges rated the appearance of the teeth with EF as significantly more objectionable before treatment. All judges found a significant improvement in the severity of EF after treatment. Using a newly developed visual analog scale, our study indicates that EF of an objectionable nature can be significantly improved with a simple microabrasion technique, thus conserving tooth structure and minimizing the cost of treating EF.
Collapse
Affiliation(s)
- Hardy Limeback
- Faculty of Dentistry, University of Toronto, Toronto, Canada.
| | | | | |
Collapse
|