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Palhari FTL, Almeida LDM, Liporoni PCS, Hilgert LA, Zanatta RF. Influence of the combined effect of desensitizing dentifrices and universal adhesives on dentin bond strength under erosive conditions. J Appl Oral Sci 2023; 31:e20230224. [PMID: 37909528 PMCID: PMC10609650 DOI: 10.1590/1678-7757-2023-0224] [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: 07/01/2023] [Revised: 09/05/2023] [Accepted: 09/18/2023] [Indexed: 11/03/2023] Open
Abstract
OBJECTIVE This study aimed to evaluate whether the use of desensitizing dentifrices containing obliterating agents can affect bond strength of eroded/abraded dentin. METHODOLOGY A total of 100 dentin samples were obtained from human molars. The teeth were cut into 3 mm-thickness discs and allocated in five groups (n=20), according to the toothpaste used: WoF - abrasion with fluoride-free toothpaste (Cocoricó); Arg - toothpaste containing arginine (Colgate Sensitive Pro-Relief); Nov - calcium sodium phosphosilicate toothpaste (Sensodyne Repair and Protect); SnF - fluoride-containing toothpaste (AmF/SnCl2/SnF2 - Elmex Erosion); and Control (no erosive/abrasive process). The erosive/abrasive cycle consisted of immersion in citric acid (1%, pH 2.6, 5 min, 4×/day) and abrasion (2×/day, 120-20 sec abrasion, 100 sec immersion) with each toothpaste. During intervals, samples were immersed in artificial saliva. This cycle was performed for five days. Two resin cylinders (2 mm in diameter) were constructed on each sample for the shear bond strength test using a universal adhesive system. The self-etch and etch-and-rinse (Scotchbond Universal) strategies were employed, each in half of the total sample (n=10). Bond strength (MPa) was measured in a shear test and failure modes were assessed with a stereomicroscope. Statistical analysis was performed using the two-way analysis of variance (ANOVA) and Tukey tests (p<0.05). RESULTS A statistically significant difference was found between the adhesive strategies tested (p<0.001), with the self-etching form showing higher values than the etch-and-rinse. Moreover, no significant differences were observed between the tested toothpastes (p=0.750) and interactions (p=0.438). CONCLUSION The use of toothpaste containing obliterating agents does not affect bond strength to dentin subjected to erosive/abrasive conditions when a universal adhesive is used. However, the self-etch strategy might be preferred for eroded/abraded dentin.
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Affiliation(s)
| | - Laís da Mata Almeida
- Universidade de Brasília (UnB), Faculdade de Ciências da Saúde , Departamento de Odontologia , Brasilia , DF , Brasil
| | | | - Leandro Augusto Hilgert
- Universidade de Brasília (UnB), Faculdade de Ciências da Saúde , Departamento de Odontologia , Brasilia , DF , Brasil
| | - Rayssa Ferreira Zanatta
- Universidade de Brasília (UnB), Faculdade de Ciências da Saúde , Departamento de Odontologia , Brasilia , DF , Brasil
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2
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Machado-Santos L, Baroudi K, Silikas N, Tribst JPM, Coelho Sinhoreti MA, Brandt WC, Liporoni PCS. Physical analysis of an acrylic resin modified by metal and ceramic nanoparticles. Dent Med Probl 2023; 60:657-664. [PMID: 37966919 DOI: 10.17219/dmp/171844] [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: 07/21/2023] [Revised: 08/29/2023] [Accepted: 09/04/2023] [Indexed: 11/17/2023] Open
Abstract
BACKGROUND Nanoparticles (NPs) have gained significant attention in various fields due to their unique properties and potential applications. Polymethyl methacrylate (PMMA) is an acrylic resin widely used in dentistry and medicine. However, the effect of different types of NP fillers on the physical properties of PMMA-based resins has not been thoroughly explored in the literature. OBJECTIVES The present study aimed to evaluate the effects of 3 different types of NP fillers on the physical properties of an experimental PMMA-based resin as a function of the NP content and concentration. MATERIAL AND METHODS Ten groups (n = 10) were designed. The specimens were composed of an acrylic resin, silicon dioxide (SiO2), cerium dioxide (CeO2), and titanium dioxide (TiO2) at the following ratios (wt%): group 1 (G1) - control; group 2 (G2) - 0.5% SiO2; group 3 (G3) - 1% SiO2; group 4 (G4) - 3% SiO2; group 5 (G5) - 0.5% CeO2; group 6 (G6) - 1% CeO2; group 7 (G7) - 3% CeO2; group 8 (G8) - 0.5% TiO2; group 9 (G9) - 1% TiO2; and group 10 (G10) - 3% TiO2. Transmission electron microscopy (TEM) was used to assess the quality of NP dispersion. Thermal stability was assessed with thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). The effects of the abovementioned NPs on the properties of the resin were evaluated using the Archimedes principle for density, the Vickers hardness (VH) test and the impact strength (IS) test. Data analysis employed the oneand two-way analysis of variance (ANOVA), followed by Duncan's post hoc test at a significance level of 0.05. RESULTS Transmission electron microscopy showed partial NP dispersion. All types of NPs enhanced the mechanical properties of the acrylic resin except for IS, which was similar to that of the control group. Among the types of NPs, irrespective of the weight percentage, CeO2 showed higher thermal stability and higher IS for 0.5 wt% and 1 wt% as compared to other groups, as well as the highest values of density at 0.5 wt%, 1 wt% and 3 wt%. Titanium oxide at 1 wt% presented a higher VH as compared to other groups. The fracture pattern was the same for all groups. CONCLUSIONS Incorporating the tested NPs into the acrylic resin resulted in enhanced physical properties, primarily attributed to a lower NP content.
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Affiliation(s)
| | - Kusai Baroudi
- Department of Restorative Dentistry, School of Dentistry, University of Taubaté, Brazil
- RAK College of Dental Sciences, RAK Medical and Health Sciences University, Ras Al Khaimah, UAE
| | - Nikolaos Silikas
- Department of Dentistry, School of Medical Sciences, University of Manchester, UK
| | - João Paulo Mendes Tribst
- Department of Reconstructive Oral Care, Academic Centre for Dentistry Amsterdam (ACTA), Universiteit van Amsterdam and Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
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Andreucci AC, Tavares AC, Palhari FTL, Liporoni PCS, Freitas MR, Aguiar FHB, Zanatta RF. Restoration of teeth with customized CAD/CAM glass fiber posts: report of 2 cases. Gen Dent 2022; 70:74-77. [PMID: 35993938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
This article presents 2 cases in which computer-aided design/computer-aided manufacturing (CAD/CAM) was used to fabricate glass fiber posts to restore an anterior tooth and a posterior tooth with severe coronal destruction. In the past decade, CAD/CAM technology has improved, allowing high-precision milling of customized glass fiber posts. This can enhance the biomechanical behavior of the restoration, as the post and core are milled in a single unit, decreasing the risk of failure near the core junction or in the body of the core. The customized post also provides better adaptation and requires a thinner layer of cement, thus minimizing voids. In case 1, the patient had a severely damaged maxillary right canine with a ferrule from a previous restoration. In case 2, the patient presented with a mandibular left first molar exhibiting severe coronal destruction. In both cases, impressions of the root canal were scanned with a bench scanner, and the posts were fabricated using a glass fiber material designed for CAD/CAM technology. A self-adhesive resin cement was used to cement the posts in the root canals, and a metal-free crown (case 1) and overlay (case 2) were fabricated and placed. Satisfactory retention and esthetics were achieved, and both patients was pleased by the final results. These cases demonstrate the viability of CAD/CAM to restore endodontically treated teeth, and this technology can be an option for dentists interested in using a digital workflow. The longevity of the posts produced via this technique needs to be evaluated in clinical trials.
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Strini BS, Marques JFDL, Pereira R, Sobral-Souza DF, Pecorari VGA, Liporoni PCS, Aguiar FHB. Comparative Evaluation of Bulk-Fill Composite Resins: Knoop Microhardness, Diametral Tensile Strength and Degree of Conversion. Clin Cosmet Investig Dent 2022; 14:225-233. [PMID: 35957701 PMCID: PMC9359371 DOI: 10.2147/ccide.s376195] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Accepted: 07/21/2022] [Indexed: 12/04/2022] Open
Abstract
Purpose Bulk-fill composite resins were developed to reduce time and facilitate the restorative procedure. However, considering their recent introduction on the market and the new formulations, their performance still requires evaluation. This study aimed to evaluate Knoop microhardness (KHN), diametral tensile strength (DTS) and degree of conversion (DC) of three Bulk-Fill composite resins and a conventional one. Materials and Methods Sixty samples (n = 15; 8 mm ø x 4 mm height) were confectioned using a mold. Filtek Bulk-Fill (FBF), Tetric N-Ceram Bulk-Fill (TNC) and SonicFill 2 (SF2) were placed in 4 mm increments, and Filtek Z350 (FZ350) was placed in 2 mm increments. The KHN of top and bottom surfaces were tested using Knoop Hardness tester at 10 gf/10s. The DTS was tested under compressive load at 1.0 mm/min. The DC was measured by Fourier Transform Infrared (FTIR) spectroscopy. Differences in DTS and DC were analyzed by ANOVA and Tukey post hoc test. For KHN, Kruskal–Wallis and Wilcoxon tests were performed at α = 0.05. Results Top surfaces of all composite resins had higher KHN than bottom surfaces. At top and bottom surfaces, FZ350 showed higher KHN than TNC and SF2. The highest DTS was obtained by FBF, followed by FZ350 and SF2. The highest DC was obtained by SF2, the lowest one was obtained by FBF. Conclusion From Bulk-Fill composite resins, FBF presented the best KHN and DTS results. The SF2 showed the best DC. Further studies are required to ensure whether these differences can negatively influence the behavior of in vivo restorations.
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Affiliation(s)
- Bruna Scarcello Strini
- Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil
| | - Joyce Figueiredo de Lima Marques
- Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil
- Correspondence: Joyce Figueiredo de Lima Marques, Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Av. Limeira, 901, Piracicaba, SP, 13414-903, Brazil, Tel +55 19 2106-5337; +55 84 99966-8539, Fax +55 19 3421-0144, Email
| | - Renata Pereira
- Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil
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de Resende LFM, Catelan A, Baroudi K, Palialol ARM, de Resende AM, Andreucci AC, Zanatta RF, Liporoni PCS. Mechanical Properties of Experimental Composites with Different Photoinitiator. Eur J Dent 2021; 16:167-172. [PMID: 34428844 PMCID: PMC8890916 DOI: 10.1055/s-0041-1731929] [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: 11/17/2022] Open
Abstract
Objective
The effect of different photoinitiators on mechanical properties of experimental composites was evaluated.
Materials and Methods
Resin composites were formulated by using a blend of bisphenol A-glycidyl and triethylene glycol (50/50 wt%) dimethacrylate monomers, and 65 wt% of barium aluminium silicate and silica filler particles. Photoinitiators used were 0.2% camphorquinone (CQ) and 0.8% co-initiator (DMAEMA); 0.2% phenyl-propanedione and 0.8% DMAEMA; 0.1% CQ + 0.1% phenyl propanedione and 0.8% DMAEMA; 0.42% mono(acyl)phosphine oxide (MAPO); and 0.5% bis(acyl)phosphine oxide (BAPO). Specimens (
n
= 10) were light cured by using a multiple-emission peak light-emitting diode for 20 seconds at 1,200 mW/cm
2
of irradiance and Knoop hardness and plasticization, depth of cure, flexural strength, and elastic modulus were evaluated. Data were statiscally analyzed at significance level of α = 5%.
Results
Experimental composites containing MAPO and BAPO photoinitiators showed the highest values of flexural strength, elastic modulus, top surface hardness, and lower hardness reduction caused by alcohol compared with CQ. Composites containing CQ and PPD showed similar results, except for depth of cure and hardness of bottom surface.
Conclusion
BAPO and MAPO showed higher flexural strength, elastic modulus, hardness on top surface, and lower polymer plasticization to CQ.
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Affiliation(s)
| | - Anderson Catelan
- Department of Dentistry, Faculty of Health Sciences, University of Western São Paulo, Presidente Prudente, São Paulo, Brazil
| | - Kusai Baroudi
- School of Dentistry, University of Taubaté, Taubaté, São Paulo, Brazil
| | - Alan Rodrigo Muniz Palialol
- Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil
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de Freitas MR, de Carvalho MM, Liporoni PCS, Fort ACB, Moura RDME, Zanatta RF. Effectiveness and Adverse Effects of Over-the-Counter Whitening Products on Dental Tissues. Front Dent Med 2021. [DOI: 10.3389/fdmed.2021.687507] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The role of bleaching agents (e.g., hydrogen peroxide) in tooth bleaching is quite well-described in a few literature studies and considered as the option choice for those desiring brighter teeth, but alternative methods have emerged to fulfill the desire of patients in a faster, easier, and cheaper way. In this context, whitening over-the-counter (OTC) products are available in several vehicles, such as toothpaste, rinses, gums, paint-on varnishes, and strips, but their effectiveness in terms of bleaching is questioned. This review aimed to describe their mode of action, whitening effectiveness, and harmful effects associated with the indiscriminate use of these products. Dentifrices usually present a combination of abrasives that can induce damage to the tooth surface without evidence of promoting real bleaching. The same was found for rinses, which might present a low pH, with an erosive potential. Charcoal has been included in the composition of these products to improve their whitening effect but there is no evidence supporting it. Regarding strips, they present hydrogen peroxide in a variety of concentrations and are the only OTC products able to promote bleaching. Despite the vehicle, an indication for the use of these products should be made after a careful individual diagnosis of the etiology of the dental staining, considering that most of them seem to be effective only in removing extrinsic stains or preventing their formation over enamel. Also, their indiscriminate use might induce damage and deleterious effects over tooth tissues or gingival tissues. The dentist should be aware of the composition and mode of action of each individual product as they change according to the composition and the vehicle used to recommend the best mode of usage. Still, there is no sound evidence that any of the described OTC products promote a better bleaching effect than the products indicated for a professional.
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Liporoni PCS, Wan Bakar WZ, Zanatta RF, Ambrosano GM, Aguiar FHB, Amaechi BT. Influence of Erosion/Abrasion and the Dentifrice Abrasiveness Concomitant with Bleaching Procedures. Clin Cosmet Investig Dent 2020; 12:101-109. [PMID: 32280280 PMCID: PMC7132029 DOI: 10.2147/ccide.s234716] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Accepted: 02/04/2020] [Indexed: 11/23/2022] Open
Abstract
Purpose The aim of this study was to evaluate the effect of erosive/abrasive cycles and two different levels of abrasiveness of dentifrices over enamel and dentin subjected to bleaching. Methods Enamel and dentin bovine specimens were prepared and submitted to an at-home bleaching treatment using 9.5% hydrogen peroxide gel, which was applied daily (30 min/14 days). Concomitant with bleaching, an erosive cycle was performed using citric acid (0.3%, pH 3.8, 5 mins, 3×/day), followed by immersions in artificial saliva for remineralization (30 mins). Abrasion was done with two (high and low abrasiveness) dentifrices (2×/day, 120 seconds) after the first and third erosive immersion each day. Enamel and dentin softening were assessed by microhardness and erosive tooth wear by optical profilometry. Data were submitted to repeated measures ANOVA, followed by the Tukey’s test with a significance level of 5%. Results For the enamel and considering the erosive-abrasive cycle, significant differences were found between the groups tested, the bleaching, and the abrasiveness of the dentifrice tested; however, the final microhardness values were significantly lower than the initial ones. For dentin, differences were found between the eroded/abrasion and the non-eroded/abrasion groups, with the former presenting lower microhardness values compared with the latter. In addition, bleaching decreased the microhardness values only for the highly abrasive dentifrice, and the final values were lower than for the initial ones for all tested groups. Conclusion The use of high and low abrasiveness dentifrices during bleaching and concomitant with erosion/abrasion cycles is more harmful to dentin than to enamel. Clinical Relevance Although bleaching is considered a conservative treatment, it can cause deleterious effects to dental hard tissue. The association of an at-home bleaching technique with erosion and high- or low- abrasive dentifrices harms dentin more than enamel.
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Affiliation(s)
- Priscila Christiane Suzy Liporoni
- Department of Restorative Dentistry, University of Taubaté, Taubaté, SP, Brazil.,Department of Comprehensive Dentistry, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
| | - Wan Zaripah Wan Bakar
- School of Dental Sciences, Universiti Sains Malaysia Health Campus, 16150 Kubang Kerian, Kelantan, Malaysia
| | | | - Glaucia Maria Ambrosano
- Department of Community Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, SP, Brazil
| | | | - Bennett T Amaechi
- Department of Comprehensive Dentistry, University of Texas Health Science Center at San Antonio, San Antonio, TX, USA
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Figueiredo Macedo de Lima J, Aguiar Jordão Mainardi MDC, Puppin-Rontani RM, Pereira Rodrigues-Filho U, Suzy Liporoni PC, Calegaro ML, Rischka K, Baggio Aguiar FH. Bioinspired catechol chemistry for dentin remineralization: A new approach for the treatment of dentin hypersensitivity. Dent Mater 2020; 36:501-511. [DOI: 10.1016/j.dental.2020.01.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2019] [Revised: 12/20/2019] [Accepted: 01/14/2020] [Indexed: 11/25/2022]
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Eskelsen E, Catelan A, Hernades NMAP, Soares LES, Cavalcanti AN, Aguiar FHB, Liporoni PCS. Physicochemical changes in enamel submitted to pH cycling and bleaching treatment. Clin Cosmet Investig Dent 2018; 10:281-286. [PMID: 30588123 PMCID: PMC6296191 DOI: 10.2147/ccide.s184683] [Citation(s) in RCA: 10] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Objective The purpose of this study was to assess the hardness, mineral content, surface roughness, and micromorphology of sound and slightly demineralized enamels, before and after bleaching procedure using 10% carbamide peroxide. Methods Sixty bovine dental blocks were randomly divided into the following two groups: 30 slabs were submitted to three cycles of pH and 30 slabs were noncycled. Hardness (n=10) was measured using the microhardness tester with Knoop indenter under a 50 g load for 5 seconds. The calcium/phosphate (Ca/P) ratio (n=10) was obtained using a micro-energy-dispersive X-ray fluorescence (μ-EDXRF) spectrometer. The measurement of roughness average (n=10) was performed using a surface roughness tester. Specimens were bleached 6 hours/day during 21 days, and then, physicochemical properties were re-evaluated. Two additional specimens were carried out to evaluate surface micromorphology using the scanning electron microscopy. Data were statistically analyzed by ANOVA and Tukey's test (α=0.05). Results Sound and slightly demineralized enamels showed no difference in Ca/P ratio after dental bleaching according to the μ-EDXRF analysis, but the Ca/P ratio decreased after bleaching for slightly demineralized enamel. Bleaching treatment decreased the hardness and increased the surface roughness, causing micromorphology alterations. Conclusion Therefore, bleaching procedure promoted change in bovine enamel surface and increased the demineralization of slightly demineralized enamel but not affected the mineral content of sound enamel.
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Affiliation(s)
- Evania Eskelsen
- Department of Dentistry, University of Taubaté, Taubaté, São Paulo, Brazil,
| | - Anderson Catelan
- Department of Dentistry, University of Taubaté, Taubaté, São Paulo, Brazil,
| | | | - Luís Eduardo Silva Soares
- Laboratory of Biomedical Vibrational Spectroscopy, Research and Development Institute, University of Vale do Paraíba, São José dos Campos, São Paulo, Brazil
| | - Andrea Nóbrega Cavalcanti
- Department of Restorative Dentistry, School of Medicine and Public Health of Bahia and Federal University of Bahia, Salvador, Bahia, Brazil
| | - Flávio Henrique Baggio Aguiar
- Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba, São Paulo, Brazil,
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Theobaldo JD, Aguiar FHB, Pini NIP, Lima DANL, Liporoni PCS, Catelan A. Effect of preheating and light-curing unit on physicochemical properties of a bulk fill composite. Clin Cosmet Investig Dent 2017; 9:39-43. [PMID: 28652817 PMCID: PMC5477166 DOI: 10.2147/ccide.s130803] [Citation(s) in RCA: 11] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
Abstract
Objective The aim of this study is to evaluate the effect of composite preheating and polymerization mode on degree of conversion (DC), microhardness (KHN), plasticization (P), and depth of polymerization (DP) of a bulk fill composite. Methods Forty disc-shaped samples (n = 5) of a bulk fill composite were prepared (5 × 4 mm thick) and randomly divided into 4 groups according to light-curing unit (quartz–tungsten–halogen [QTH] or light-emitting diode [LED]) and preheating temperature (23 or 54 °C). A control group was prepared with a flowable composite at room temperature. DC was determined using a Fourier transform infrared spectrometer, KHN was measured with a Knoop indenter, P was evaluated by percentage reduction of hardness after 24 h of ethanol storage, and DP was obtained by bottom/top ratio. Data were statistically analyzed by analysis of variance and Tukey’s test (α = 0.05). Results Regardless of light-curing, the highest preheating temperature increased DC compared to room temperature on bottom surface. LED showed a higher DC compared to QTH. Overall, DC was higher on top surface than bottom. KHN, P, and DP were not affected by curing mode and temperature, and flowable composite showed similar KHN, and lower DC and P, compared to bulk fill. Conclusion Composite preheating increased the polymerization degree of 4-mm-increment bulk fill, but it led to a higher plasticization compared to the conventional flowable composite evaluated.
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Affiliation(s)
- Jéssica Dias Theobaldo
- Department of Restorative Dentistry, Piracicaba Dental School, University of Campinas, Piracicaba
| | | | | | | | | | - Anderson Catelan
- Departament of Dentistry, University of Taubaté, Taubaté, Brazil
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Gazola EA, Rego MA, Brandt WC, D'Arce MBF, Liporoni PCS. Microhardness evaluation of silorane and methacrylate composites submitted to erosion and abrasion processes. Acta Biomater Odontol Scand 2015. [PMID: 28642903 PMCID: PMC5433213 DOI: 10.3109/23337931.2015.1084884] [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] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Objective: The aim of this study was to evaluate the Knoop hardness number (KHN) of methacrylate (MC) and silorane (SC) composites after being submitted to erosion and abrasion processes. Material and methods: Forty samples were made with each composite: MC and SC. The samples were divided into eight groups (n = 10) according to the type of composite (G1-G4, MC; G5-G8, SC) and the beverages involved in the erosion process (G1 and G5 - Control (C), without erosion, with abrasion; G2 and G6 - Orange Juice (OJ), abrasion; G3 and G7 - Smirnoff Ice® (SI), abrasion; G4 and G8 - Gatorade® (GA), abrasion). The KHN test was performed 24 h after the last cycle of erosion/abrasion. Results: The MC groups showed smaller KHN values for the SI group (p < 0.05) when compared to the Control and OJ groups; however, for the SC groups, no differences were found (p > 0.05). Conclusion: Methacrylate composite when submitted to acidic beverages erosive challenge combined with abrasive process might alter its surface microhardness. However, the beverages used in the present study were not able to interfere in silorane composite surface microhardness.
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Affiliation(s)
- Eloá Aguiar Gazola
- Department of Restorative Dentistry, University of TaubatéTaubatéSão PauloBrazil
| | - Marcos Augusto Rego
- Department of Restorative Dentistry, University of TaubatéTaubatéSão PauloBrazil
| | | | | | - Priscila Christiane Suzy Liporoni
- Department of Restorative Dentistry, University of TaubatéTaubatéSão PauloBrazil.,Department of Restorative Dentistry, Piracicaba Dental School, UNICAMPPiracicabaSão PauloBrazil
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Attia ML, Cavalli V, Espírito Santo AMD, Martin AA, D'Arce MBF, Aguiar FHB, Lovadino JR, Rego MAD, Cavalcanti AN, Liporoni PCS. Effects of Bleaching Agents Combined with Regular and Whitening Toothpastes on Surface Roughness and Mineral Content of Enamel. Photomed Laser Surg 2015; 33:378-83. [DOI: 10.1089/pho.2014.3835] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
| | - Vanessa Cavalli
- Department of Restorative Dentistry, University of Taubaté, Taubaté, SP, Brazil
| | | | - Airton Abrahão Martin
- Research and Development Institute (IP&D), University of Paraiba Valley, São José dos Campos, SP, Brazil
| | | | | | - José Roberto Lovadino
- Department of Restorative Dentistry, Piracicaba Dental School/ University of Campinas, Piracicaba, SP, Brazil
| | | | - Andréa Nóbrega Cavalcanti
- Area of Restorative Dentistry, School of Dentistry, School of Medicine and Public Health of Bahia and School of Dentistry, Federal University of Bahia, Salvador, BA, Brazil
| | - Priscila Christiane Suzy Liporoni
- Department of Restorative Dentistry, University of Taubaté, Taubaté, SP, Brazil
- Department of Restorative Dentistry, Piracicaba Dental School/ University of Campinas, Piracicaba, SP, Brazil
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Lima DANL, Aguiar FHB, Pini NIP, Soares LES, Martin AA, Liporoni PCS, Ambrosano GMB, Lovadino JR. In vitro effects of hydrogen peroxide combined with different activators for the in-office bleaching technique on enamel. Acta Odontol Scand 2015; 73:516-21. [PMID: 25626117 DOI: 10.3109/00016357.2014.997793] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE The aim of this study was to evaluate the alteration of human enamel bleached with high concentrations of hydrogen peroxide associated with different activators. MATERIALS AND METHODS Fifty enamel/dentin blocks (4 × 4 mm) were obtained from human third molars and randomized divided according to the bleaching procedure (n = 10): G1 = 35% hydrogen peroxide (HP - Whiteness HP Maxx); G2 = HP + Halogen lamp (HL); G3 = HP + 7% sodium bicarbonate (SB); G4 = HP + 20% sodium hydroxide (SH); and G5 = 38% hydrogen peroxide (OXB - Opalescence Xtra Boost). The bleaching treatments were performed in three sessions with a 7-day interval between them. The enamel content, before (baseline) and after bleaching, was determined using an FT-Raman spectrometer and was based on the concentration of phosphate, carbonate, and organic matrix. Statistical analysis was performed using two-way ANOVA for repeated measures and Tukey's test. RESULTS The results showed no significant differences between time of analysis (p = 0.5175) for most treatments and peak areas analyzed; and among bleaching treatments (p = 0.4184). The comparisons during and after bleaching revealed a significant difference in the HP group for the peak areas of carbonate and organic matrix, and for the organic matrix in OXB and HP+SH groups. Tukey's analysis determined that the difference, peak areas, and the interaction among treatment, time and peak was statistically significant (p < 0.05). CONCLUSION The association of activators with hydrogen peroxide was effective in the alteration of enamel, mainly with regards to the organic matrix.
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Affiliation(s)
- Débora Alves Nunes Leite Lima
- Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas - FOP/Unicamp , Piracicaba, SP , Brazil
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Giorgi MCC, Aguiar FHB, Soares LL, Martin AA, Liporoni PCS, Paulillo LAMS. Does an additional UV LED improve the degree of conversion and Knoop Hardness of light-shade composite resins? Eur J Dent 2012. [DOI: 10.1055/s-0039-1698978] [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: 10/24/2022] Open
Abstract
ABSTRACTObjective: The purpose of this study was to evaluate the degree of conversion (DC) using FTRaman spectroscopy and the Knoop hardness (KHN) of composites cured by second and third-generation LED light curing-units (LCU), Radii Cal and Ultralume 5.Methods: Three composites (Filtek Supreme XT, Filtek Z350, and Esthet X) were selected for this study. KHN testing (n=10) was performed with 10 indentations for the top (T) and bottom (B) surfaces. For DC (n=10), both the T and B surfaces were analyzed.Results: For KHN, the three composites differed in hardens. There was a “LCU-surface” interaction, in which Radii Cal showed significantly greater hardens in the B surface. For DC, there was a “composite-surface-LCU” interaction. For the “composite” factor, there was no significant difference between the groups, except for Supreme XT-Radii Cal (T or B surfaces). For the “LCU” factor there was a significant difference for Supreme XT T surface, Ultralume 5 obtained a higher DC. For the Z350 T surface, a significant difference in the DC in which Radii Cal obtained better results. For the “surface” factor, all groups presented T surfaces with a higher DC than the B surfaces, the sole exceptions involved Esthet X-Radii Cal and Z350-Ultralume 5.Conclusion: Knowledge regarding composite composition and the characteristics of LCUs are important for effective polymerization. (Eur J Dent 2012;6:396-401)
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Giorgi MCC, Aguiar FHB, Soares LES, Martin AA, Liporoni PCS, Paulillo LAMS. Does an additional UV LED improve the degree of conversion and Knoop Hardness of light-shade composite resins? Eur J Dent 2012; 6:396-401. [PMID: 23077419 PMCID: PMC3474554] [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] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022] Open
Abstract
OBJECTIVE The purpose of this study was to evaluate the degree of conversion (DC) using FT-Raman spectroscopy and the Knoop hardness (KHN) of composites cured by second and third-generation LED light curing-units (LCU), Radii Cal and Ultralume 5. METHODS Three composites (Filtek Supreme XT, Filtek Z350, and Esthet X) were selected for this study. KHN testing (n=10) was performed with 10 indentations for the top (T) and bottom (B) surfaces. For DC (n=10), both the T and B surfaces were analyzed. RESULTS For KHN, the three composites differed in hardens. There was a "LCU-surface" interaction, in which Radii Cal showed significantly greater hardens in the B surface. For DC, there was a "composite-surface-LCU" interaction. For the "composite" factor, there was no significant difference between the groups, except for Supreme XT-Radii Cal (T or B surfaces). For the "LCU" factor there was a significant difference for Supreme XT T surface, Ultralume 5 obtained a higher DC. For the Z350 T surface, a significant difference in the DC in which Radii Cal obtained better results. For the "surface" factor, all groups presented T surfaces with a higher DC than the B surfaces, the sole exceptions involved Esthet X-Radii Cal and Z350-Ultralume 5. CONCLUSION Knowledge regarding composite composition and the characteristics of LCUs are important for effective polymerization.
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Affiliation(s)
- Maria Cecília Caldas Giorgi
- Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas (UNICAMP), Piracicaba (SP), BRAZIL
| | - Flávio Henrique Baggio Aguiar
- Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas (UNICAMP), Piracicaba (SP), BRAZIL,Corresponding author: Dr. Flávio Henrique Baggio Aguiar, Department of Restorative Dentistry, Piracicaba Dental School, State University of Campinas (UNICAMP), Piracicaba (SP), BRAZIL, Tel: +55 19 21065337
| | - Luís Eduardo Silva Soares
- Laboratory of Biomedical Vibrational Spectroscopy (LEVB), Research and Development Institute (IPD), Vale do Paraíba University (UNIVAP), São José dos Campos (SP), BRAZIL
| | - Airton Abrahão Martin
- Laboratory of Biomedical Vibrational Spectroscopy (LEVB), Research and Development Institute (IPD), Vale do Paraíba University (UNIVAP), São José dos Campos (SP), BRAZIL
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Cavalli V, Cardoso CDA, Zandonadi FDA, Liporoni PCS, Berger SB, Giannini M. Secondary caries inhibition promoted by adhesive systems and bleaching agents with fluoride. Am J Dent 2012; 25:141-145. [PMID: 22988683] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
PURPOSE To evaluate the initial caries development at adhesive/enamel interface after 10% carbamide peroxide bleaching (CP) with or without fluoride (F) under dynamic pH-cycling. METHODS Standard cavities were prepared on the bucal surface of 60 bovine incisors, which were restored with two fluoride-containing adhesives: Optibond FL (FL) and Optibond Solo Plus (SP). The restored teeth were submitted to thermal cycling process in order to age the adhesive/enamel interface. Both SP and FL adhesive-restored teeth were divided into groups (n= 10) and bleached with 10% CP (CP) and 10% CP + F (CPF) or remained unbleached (Control). Bleaching was performed for 14 days simultaneously with pH-cycling. The specimens were prepared for cross-section microhardness evaluation and polarized light microscopy analysis to evaluate caries lesions at different depths around the bonded interface. RESULTS Group FL (not bleached) presented the lowest mineral loss rate among groups, but secondary caries formation was observed for all groups around the bonded interface. An inhibition zone was observed for all groups, with caries lesion detected at 5 microm from the cavity wall.
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Affiliation(s)
- Vanessa Cavalli
- Department of Dentistry, University of Taubaté, R. Expedicionário Ernesto Pereira, 110, Taubaté - SP 12020-330 Brazil.
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Pereira CA, Eskelson E, Cavalli V, Liporoni PCS, Jorge AOC, do Rego MA. Streptococcus mutans biofilm adhesion on composite resin surfaces after different finishing and polishing techniques. Oper Dent 2011; 36:311-7. [PMID: 21740238 DOI: 10.2341/10-285-l] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [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 evaluated Streptococcus mutans biofilm adhesion on the surface of three composite resins (nanofilled, Filtek Z350, 3M ESPE, Salt Lake City, UT, USA; nanohybrid, Vit-1-escence, Ultradent Products, South Jordan, UT, USA; and microhybrid, Esthet X, Dentsply, Milford, DE, USA) following different finishing and polishing techniques. Sixty standardized samples (6 × 3 mm) of each composite were produced and randomly divided into three finishing and polishing treatments (n=20): 1) control group: composite resin surface in contact with Mylar matrix strips with no finishing or polishing performed, 2) Sof-Lex aluminum oxide disc technique (3M ESPE, and 3) carbide bur finishing and Astrobrush polishing technique (Ultradent). Half the samples of each group were incubated in human saliva for 1 hour, and all the samples were subjected to S mutans (ATCC 35688) biofilm development. The mean log of CFU/mL present in the S mutans biofilm was calculated, and data were statistically analyzed by three-way analysis of variance and the Tukey test (p<0.05). Human saliva incubation promoted a significant increase of bacterial adherence on all three of the composites' surfaces, regardless of the polishing treatment performed (p<0.05). Of the three, the nanofilled composite (Filtek Z350) had the lowest bacterial adherence with each of the finishing and polishing techniques despite the presence or absence of human saliva (p<0.05). Mylar matrix strips (control group) promoted the lowest bacterial adhesion on the surface of the microhybrid and nanofilled composites in the absence of human saliva.
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Affiliation(s)
- C A Pereira
- Department of Biosciences and Oral Diagnosis, Univ. Estadual Paulista, Sao Jose dos Campos, Brazil
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Porto ICCDM, Soares LES, Martin AA, Cavalli V, Liporoni PCS. Influence of the photoinitiator system and light photoactivation units on the degree of conversion of dental composites. Braz Oral Res 2010; 24:475-81. [DOI: 10.1590/s1806-83242010000400017] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2010] [Accepted: 08/03/2010] [Indexed: 11/21/2022] Open
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Penteado RAPM, Tonholo J, Júnior JG, Silva MFDA, Queiroz CDS, Cavalli V, Rego MAD, Liporoni PCS. Evaluation of surface roughness of microhybrid and nanofilled composites after pH-cycling and simulated toothbrushing. J Contemp Dent Pract 2010; 11:E017-E24. [PMID: 21203733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
AIM This study evaluated the surface roughness patterns of two resin-based composite restorative materials, a microhybrid (Filtek Z250, 3M ESPE) and a nanofilled (Filtek Supreme, 3M ESPE), subjected to a regimen that simulated dynamic pH-cycling and toothbrushing. METHODS AND MATERIALS Twelve standardized cylindrical specimens of each resin-based composite material were prepared, finished, and mechanically polished. The experimental units were submitted to a pH-cycling regimen followed by 50,000 toothbrushing cycles, after which the surface roughness was measured using an atomic force microscope (AFM). AFM surface roughness was evaluated at three intervals: (1) immediately after specimen preparation (baseline), (2) after pH-cycling, and (3) after simulated toothbrushing. The results were then analyzed using a split-plot design and followed by linear regression and a Tukey's test at a significance level of p<0.05. RESULTS The results obtained indicated that simulated toothbrushing provoked a remarkable increase in surface roughness for both types of composite resins tested (p=0.0031). However, pH-cycling did not alter the surface of the composite under the conditions of this experiment. CONCLUSION Based on the results obtained, it was concluded that simulated toothbrushing was capable of increasing the surface roughness of the microhybrid (Filtek Z250) and the nanofilled (Filtek Supreme) composites tested. CLINICAL SIGNIFICANCE Surface roughness of nanofilled and microhybrid composites is significantly increased after toothbrushing, although pH-cycling, as tested in this study, does not appear to affect the morphology of either composite material.
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Liporoni PCS, Souto CMC, Pazinatto RB, Cesar ICR, de Rego MA, Mathias P, Cavalli V. Enamel Susceptibility to Coffee and Red Wine Staining at Different Intervals Elapsed from Bleaching: A Photoreflectance Spectrophotometry Analysis. Photomed Laser Surg 2010; 28 Suppl 2:S105-9. [DOI: 10.1089/pho.2009.2627] [Citation(s) in RCA: 33] [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] [Indexed: 11/12/2022] Open
Affiliation(s)
| | | | | | | | | | - Paula Mathias
- Federal University of Bahia, Department of Dentistry, Salvador-BA, Brazil
| | - Vanessa Cavalli
- University of Taubaté, Department of Dentistry, Taubaté, SP, Brazil
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Paula SDS, Soares LES, do Espírito Santo AM, Martin AA, Cavalli V, Liporoni PCS. FT-Raman and energy dispersive X-ray fluorescence spectrometric analyses of enamel submitted to 38% hydrogen peroxide bleaching, an acidic beverage, and simulated brushing. Photomed Laser Surg 2010; 28:391-6. [PMID: 19860554 DOI: 10.1089/pho.2008.2426] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVE This study aimed to investigate the effects on enamel surface treated with hydrogen peroxide bleaching and acidic soft drink immersion and/or brushing with whitening dentifrices. MATERIALS AND METHODS Fifty-six standardized enamel slabs obtained from labial surfaces of bovine incisors were used. Enamel slabs were ground flat, polished, and randomly assigned to one of seven treatment groups: (1) control, in which no treatment was performed, (2) soft drink immersion, (3) 38% hydrogen peroxide bleaching, (4) simulated toothbrushing with whitening dentifrice, (5) soft drink immersion and bleaching, (6) soft drink immersion, bleaching, and toothbrushing, and (7) bleaching and toothbrushing. The mineral concentration of enamel surfaces was determined before and after treatments by means of Fourier transform (FT)-Raman spectroscopy and energy dispersive x-ray fluorescence spectrometry (EDXRF). Data were statistically analyzed by ANOVA and Tukey test (p < 0.05). RESULTS Raman spectroscopy results indicated that enamel mineral content decreased after all treatments except in group 1, whereas EDXRF results exhibited mineral decrease in groups 3, 4, 5, and 7. CONCLUSION Bleaching alone or in combination with soft drink immersion and brushing decreases enamel mineral content.
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Maia SRC, Cavalli V, Liporoni PCS, do Rego MA. Influence of saliva contamination on the shear bond strength of orthodontic brackets bonded with self-etching adhesive systems. Am J Orthod Dentofacial Orthop 2010; 138:79-83. [PMID: 20620837 DOI: 10.1016/j.ajodo.2008.08.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2008] [Revised: 08/01/2008] [Accepted: 08/01/2008] [Indexed: 11/25/2022]
Abstract
INTRODUCTION Our objective was to evaluate the influence of saliva contamination on the shear bond strength of orthodontic brackets bonded with self-etching primers. METHODS One hundred thirty-five bovine incisors were randomly divided into 3 groups, and exposed enamel surfaces were bonded with Transbond Plus Self Etching Primer (TB) (3M Unitek, Monrovia, Calif), Adhese Single Bottle (AD) (Ivoclar, Vivadent, Schaan, Liechtenstein), and Self Etch Bond (SE) (Vigodent, Rio de Janeiro, Brazil). Each group was subdivided into 3 treatments (n = 15): saliva contamination (S), saliva contamination and deionized water rinsing (SW), and no salivary contamination (C). Resin composite (Z-100, 3M/ESPE, Salt Lake City, Utah) was applied to all samples to bond the orthodontic brackets. Shear bond strength testing was carried out in a universal testing machine operating at 1.0 mm per minute. RESULTS The results were statistically analyzed with 2-way analysis of variance (ANOVA) and Tukey tests (P <0.05). Saliva contamination caused a significant decrease of enamel strength in the groups bonded with TB and SE compared with the SW and C groups. Enamel bond strengths of the C and SW groups were higher than those of the TB group, followed by the AD and SE groups. Enamel bond strength after S was higher than AD, followed by TB and SE. CONCLUSIONS The shear bond strengths of orthodontic brackets to enamel and the performance of the adhesive systems were influenced by contamination with saliva.
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Cesar ICR, Soares LES, Alves LP, Martin AA, Munin E, Liporoni PCS. Fourier Transform–Raman and Reflectance Studies on Dental Enamel Bleached with Hydrogen Peroxide Activated Using a Light-Emitting Diode–Laser System. Photomed Laser Surg 2009; 27:913-9. [DOI: 10.1089/pho.2008.2409] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Ilene Cristine Rosia Cesar
- Laboratory of Biomedical and Non-Linear Optics, Vale do Paraiba University, São José dos Campos, São Paulo, Brazil
- Department of Dentistry, Vale do Paraiba University, São José dos Campos, São Paulo, Brazil
| | - Luís Eduardo Silva Soares
- Laboratory of Biomedical Vibrational Spectroscopy, Research and Development Institute, Vale do Paraiba University, São José dos Campos, São Paulo, Brazil
- Department of Dentistry, Vale do Paraiba University, São José dos Campos, São Paulo, Brazil
| | - Leandro Procópio Alves
- Laboratory of Biomedical and Non-Linear Optics, Vale do Paraiba University, São José dos Campos, São Paulo, Brazil
| | - Airton Abrahão Martin
- Laboratory of Biomedical Vibrational Spectroscopy, Research and Development Institute, Vale do Paraiba University, São José dos Campos, São Paulo, Brazil
| | - Egberto Munin
- Laboratory of Biomedical and Non-Linear Optics, Vale do Paraiba University, São José dos Campos, São Paulo, Brazil
| | - Priscila Christiane Suzy Liporoni
- Department of Restorative Dentistry, Universidade de Taubaté, São Paulo, Brazil
- Department of Dentistry, Vale do Paraiba University, São José dos Campos, São Paulo, Brazil
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Eskelsen E, Fernandes CB, Pelogia F, Cunha LG, Pallos D, Neisser MP, Liporoni PCS. Concurrence between the maxillary midline and bisector to the interpupillary line. J ESTHET RESTOR DENT 2009; 21:37-41; discussion 42. [PMID: 19207457 DOI: 10.1111/j.1708-8240.2008.00229.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
PURPOSE Symmetry is one of the factors that contributes to facial harmony, and in oral rehabilitation it determines the success of esthetic treatment. Therefore, the aim of the present study was to analyze the axial symmetry between the bipupillar midline and maxillary central incisors midline of 102 dental students (both genders) distributed across five Brazilian dental schools. MATERIALS AND METHODS Students with no teeth missing and who had never been subjected to any dental treatment were selected. Photographs were taken with a Dental Eye III camera with a 100-mm macro objective and ratio of 1:10 from natural size, recorded on an Ektachrome ASA/ISO 100 film. The images were developed and applied to Microsoft Office Power Point 2007 software. The results were analyzed by analysis of variance and Student's t-test (alpha = 0.05). RESULTS There was no significant correlation between bipupillar midline and the maxillary dental midline, irrespective of gender. CONCLUSION No significant coincidence was observed between the interpupillary and dental midline. However, the interpupillar distance and its relationship with other anatomic structures may be used as a reference in treatment, but measurements must be assessed individually. CLINICAL SIGNIFICANCE Anatomic measurements and facial proportions can be helpful during the planning of esthetic oral rehabilitation.
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Affiliation(s)
- Evania Eskelsen
- Department of Dentistry, University of Taubate, Taubate, SP, Brazil.
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Attia ML, Aguiar FHB, Mathias P, Ambrosano GMB, Fontes CM, Liporoni PCS. The effect of coffee solution on tooth color during home bleaching applications. Am J Dent 2009; 22:175-179. [PMID: 19650600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
PURPOSE To quantify the change in color of human and bovine teeth exposed to a coffee solution during a 16% carbamide peroxide (16% CP) home application bleaching treatment using photoreflectance analysis. METHODS 40 enamel slabs (4 x 4 x 2 mm) were obtained from seven unerupted third human molars and seven bovine incisors, which were allocated into four groups: G1: human control group whitened and not exposed to a coffee solution; G2: bovine control group whitened and not exposed to a coffee solution; G3: human teeth whitened and exposed to a coffee solution; G4: bovine teeth whitened and exposed to a coffee solution. The home bleaching procedure was performed using 16% CP gel applied in a 1 mm-thick layer on the tooth surface over a period of 6 hours per day, for 28 days. Tooth color was evaluated using photoreflectance analysis throughout the bleaching procedure at intervals of 7, 14, 21 and 28 days, and posttreatment at 7, 15 and 30 days. Results were statistically analyzed using ANOVA and Tukey-Kramer tests. RESULTS After 28 days of bleaching treatment, no significant difference was detected between photoreflectance analysis of specimens exposed to coffee solution and specimens not exposed to coffee solution (P < 0.05). However, when the teeth were exposed to a coffee solution during home bleaching treatment, the whitening effect was observed to be less stable (P < 0.05). Bovine and human enamel substrates behaved similarly in terms of staining and bleaching effects, although they presented inherent differences in color (P < 0.05).
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Affiliation(s)
- Mariana Lerner Attia
- Department of Restorative Dentistry, Taubaté School of Dentistry, UNITAU, Taubaté, Saõ Paulo, Brazil
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Lima DANL, Aguiar FHB, Liporoni PCS, Munin E, Ambrosano GMB, Lovadino JR. In vitro evaluation of the effectiveness of bleaching agents activated by different light sources. J Prosthodont 2009; 18:249-54. [PMID: 19210610 DOI: 10.1111/j.1532-849x.2008.00420.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
PURPOSE This study evaluated the efficacy of tooth whitening and color stability at different time periods after treatment. MATERIALS AND METHODS Blocks obtained from human molars were divided into 15 groups (n = 5) by bleaching agents: 35% hydrogen peroxide (Whiteness HP and Opalescence Xtra) and 37% carbamide peroxide (Whiteness Super); and light sources: halogen lamp and plasma arc lamp (bleach mode), LED/diode laser, argon laser, and no light source. The efficacy of bleaching was measured using a spectrophotometer. Six bleaching sessions were performed (times 1 to 6). The specimens were submitted to another reading 7, 15, and 30 days after the end of bleaching (times 7, 8, and 9). The results were submitted to ANOVA followed by Tukey test and polynomial regression (p < 0.05). RESULTS Carbamide peroxide significantly differed from hydrogen peroxide, presenting low reflectance values. Activated versus non-activated bleaching did not differ significantly for any gel tested, except for Whiteness HP activated by argon laser, which presented the lowest mean reflectance values. The results obtained with hydrogen peroxide revealed a decrease in reflectance values one month after the end of treatment. For carbamide peroxide, this decrease was not observed. CONCLUSION The halogen lamp presented the same or higher efficacy than non-activated bleaching, which had a longer gel contact period. When hydrogen peroxide was used, a decrease in reflectance values was observed 30 days after the end of bleaching.
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Lima DANL, Silva ALFE, Aguiar FHB, Liporoni PCS, Munin E, Ambrosano GMB, Lovadino JR. In vitro assessment of the effectiveness of whitening dentifrices for the removal of extrinsic tooth stains. Braz Oral Res 2008; 22:106-11. [DOI: 10.1590/s1806-83242008000200003] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2006] [Accepted: 05/20/2007] [Indexed: 11/22/2022] Open
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Soares LES, Cesar ICR, Santos CGC, De Cardoso ALMO, Liporoni PCS, Munin E, Martin AA. Influence of coffee on reflectance and chemistry of resin composite protected by surface sealant. Am J Dent 2007; 20:299-304. [PMID: 17993026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
PURPOSE To assess the influence of the light-curing unit type and whether or not it was worth using surface sealant protection on resin composite restorative materials stained by coffee. Another objective was to propose the monitoring of coffee staining by FT-Raman spectroscopy using carbon-hydrogen (C-H) bonds as reference to the composite matrix degradation. METHODS Sixty cylindrical specimens of resin composite were prepared and divided into six groups: HC (control)--cured with a halogen light; LC (control) cured with a LED; HF--cured with a halogen light + Fortify Plus; LF--cured with a LED + Fortify Plus; HP--cured with a halogen light + PermaSeal; LP--cured with a LED + PermaSeal. After storage for 24 hours at 37% and 100% of relative humidity, the top surface was protected, and the other surfaces isolated. Polishing with paper discs was performed after 24 hours of curing and prior to FT-Raman spectroscopy and reflectance measurements. All specimens were submitted to coffee staining for 14 days and evaluated by both systems. Results were statistically analyzed by ANOVA and Tukey tests. RESULTS FT-Raman spectrum only showed significant changes in groups LC and LP (P< 0.05). Reflectance demonstrated that staining was present in all specimens protected by sealants. Sealant staining was larger in the HF (P < 0.001) group.
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Affiliation(s)
- Luís Eduardo Silva Soares
- Biomedical Vibrational Spectroscopy Laboratory, Research and Development Institute, University of Vale do Paraiba-UNIVAP, Av. Shishima Hifumi, 2911, Urbanova, 12,244-000, São José dos Campos, SP, Brazil.
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Soares LES, Liporoni PCS, Martin AA. The Effect of Soft-start Polymerization by Second Generation LEDs on the Degree of Conversion of Resin Composite. Oper Dent 2007; 32:160-5. [PMID: 17427825 DOI: 10.2341/06-45] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Clinical Relevance
Photo-polymerization using second generation LED and halogen light in the soft-start mode of curing was able to produce an adequate degree of conversion in resin composites. The lower degree of conversion produced by low power LED in the soft-start mode could lead to restoration failure, degradation of the organic matrix and recurrent caries.
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Affiliation(s)
- L E S Soares
- Discipline of Restorative and Operative Dentistry, School of Dentistry, University of Vale do Paraíba, São José dos Campos, SP, Brazil
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Cesar ICR, Redígolo ML, Liporoni PCS, Munin E. Analyses by photoreflectance spectroscopy and Vickers hardness of conventional and laser-assisted tooth bleaching. Am J Dent 2005; 18:219-22. [PMID: 16296425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
PURPOSE To evaluate the in vitro effects of two bleaching products developed to be used with halogen or argon laser lights. METHODS 20 human embedded third molars were cut into four parts resulting in 75 useful specimens. The specimens were divided at random into five groups and submitted to the traditional power bleaching procedure for enamel. Group C was separated as a control group. Group 37L was exposed to a 37% carbamide peroxide bleaching solution and exposed to 488 nm argon laser radiation. The same solution was used in Group 37H but the bleaching was exposed to a halogen lamp-based unit. The 35% carbamide peroxide was used in Groups 35L and 35H. One was treated as in Group 37L and the other as in Group 37H. The samples were analyzed for Vickers hardness and also by photoreflectance. RESULTS Group 37L presented more white spectra than Group 37H. However, Groups 35L and 35H showed similar results. Comparing both bleaching products, the 35% carbamide peroxide was more effective as a bleaching agent than the 37% formulation. No significant difference in Vickers hardness was noted between the two bleaching products.
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