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1.
J Contemp Dent Pract ; 21(1): 47-50, 2020 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-32381800

RESUMO

AIMS AND OBJECTIVES: The aim of the present study was to determine the effect of different intracanal medicaments on the apical seal of BioRoot root canal sealer (RCS). MATERIALS AND METHODS: One hundred permanent single-rooted teeth were used in this study. All the samples were decoronated at the cementoenamel junction and instrumented in a sequential order from 15 to 50 number k-file. The specimens were randomly divided into five groups containing 20 teeth each. Intracanal medicaments used in this study were Metapex, triple antibiotic paste, Metrogyl DG gel forte (metronidazole gel 1.5% w/w), and curenext gel. For control group following instrumentation, the roots were obturated with laterally compacted gutta-percha with BioRoot RCS. In medicament groups after the period of 14 days, the medicaments were removed. All the four groups were obturated with BioRoot RCS and gutta-percha cones using lateral compaction technique. All the specimens were coated with nail varnish and immersed in 2% methylene blue. Then the specimens were demineralized and diphanized. The cleared teeth were analyzed by means of a stereomicroscope under 10× magnification. All the data were analyzed in SPSS version 18 software (IBM, Chicago, IL, USA). RESULT: Among all the intracanal medicaments, triple antibiotic paste showed the highest microleakage. When Metpaex and Metrogyl DG gel forte were compared with Curcuma longa, differences were not statistically significant. CONCLUSION: Among all the intracanal medicaments, triple antibiotic paste showed the highest microleakage and least was Metapex. CLINICAL SIGNIFICANCE: Incomplete removal of medicaments prevents the penetration of sealer into the dentinal tubules and interferes with the normal setting reaction, thus affecting the seal of obturating material leading to microleakage and subsequent treatment failure. Hence, while placing an intracanal medicament, it is important to consider its effect on leakage of the root canal system.


Assuntos
Infiltração Dentária , Materiais Restauradores do Canal Radicular , Hidróxido de Cálcio , Guta-Percha , Humanos , Azul de Metileno
2.
J Contemp Dent Pract ; 21(2): 161-165, 2020 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-32381821

RESUMO

AIM: The purpose of this in vitro study was to determine the effect of different composite placement techniques on gingival microleakage of giomer restorations. MATERIALS AND METHODS: Sixty class II preparations were created in 30 extracted molar teeth with cervical margins 1 mm below the cementoenamel junction. The teeth were divided into three groups of 10 teeth each. In group I, teeth were restored with open sandwich technique using Beautifil II and Beautifil II Flow. In group II, teeth were restored with snowplow technique using Beautifil II and Beautifil Flow. In group III, teeth were restored with oblique increment technique using Beautifil II. After thermocycling and immersion in 2% methylene blue, the teeth were sectioned and dye penetration was evaluated. RESULTS: Statistically significant reduction in microleakage was found along the gingival walls in snowplow restorations compared to sandwich restoration and oblique increment restorations. CLINICAL SIGNIFICANCE: Microleakage was reduced along the gingival walls in snowplow restorations. CONCLUSION: Microleakage was significantly lower in the snowplow restorations.


Assuntos
Infiltração Dentária , Resinas Compostas , Restauração Dentária Permanente , Humanos , Dente Molar , Colo do Dente
3.
Indian J Dent Res ; 31(2): 247-251, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32436905

RESUMO

Background: Pits and Fissures are recognized as being highly susceptible to caries. Pit and fissure sealants are one of the best methods of preventing caries as it occludes the fissures and pits from the accumulation of plaque and cariogenic microflora. There are different methods of cleaning and preparing occlusal pits and fissures for preventing caries which helps in alleviating oral health status of paediatric population. Aim: The aim of the present study was to evaluate and compare the microleakage of pit and fissure sealants after using five different preparation techniques, namely: A) Conventional technique using pumice prophylaxis, B) enameloplasty with round carbide bur, C) enameloplasty with fissurotomy bur, D) air polisher, and E) air abrasion. Materials and Methods: The study was conducted on 50 caries-free premolars extracted for orthodontic purpose. These teeth were randomly assigned to five groups, 10 teeth in each for receiving fissure sealant after different surface preparation; thermocycling and sectioning of samples were performed and microleakage was assessed under a stereomicroscope after methylene blue dye immersion. Results: The results of air abrasion groups were significantly superior with "0" microleakage when compared to all other groups followed by round bur, fissurotomy bur, air polisher and pumice prophylaxis. Conclusion: To improve the marginal adaptation of the sealants, minimally invasive methods are the most favoured methods of occlusal preparation. This study promises to show positive results for fissure sealants which are likely to play an important role in caries prevention and techniques that are intended to protect caries susceptible surfaces.


Assuntos
Cistos , Infiltração Dentária , Abrasão Dental por Ar , Criança , Esmalte Dentário , Humanos , Selantes de Fossas e Fissuras , Propriedades de Superfície
4.
Indian J Dent Res ; 31(2): 291-296, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32436911

RESUMO

Context: In-vitro studies of microleakage are an initial screening method to assess the maximum theoretical loss of sealing ability in-vivo. Aims: Our objective was to determine and compare microleakage patterns of conventional glass ionomer cement (GIC) and resin-modified GIC (RMGIC) for band cementation. Methods: Forty caries-free second primary molars were randomly divided into two groups of 20 teeth each. Preformed molar bands in the two groups were cemented to enamel with one of two types of cement: Conventional GIC (Fuji I, GC Corporation; Tokyo, Japan) and RMGIC (Fuji Plus, GC Corporation; Tokyo, Japan). A dye penetration method was used for microleakage evaluation. Microleakage was determined by a stereomicroscope for the cement-band and cement-enamel interfaces. Statistical Analysis Used: Statistical analysis was performed with Kruskal-Wallis and Mann-Whitney U tests. Results: The mean microleakage value for conventional GIC (Fuji I) at cement-band and cement-enamel interfaces was 2.41 mm and 2.15 mm, respectively. The mean microleakage value for RMGIC (Fuji Plus) at cement-band and cement-enamel interfaces was 0.44 mm and 0.46 mm, respectively. Compared to conventional GIC, RMGIC showed less microleakage at both cement-band and cement-enamel interfaces. P < 0.001 and it was statistically highly significant. Conclusions: Bands cemented with RMGIC had significantly less microleakage between the cement-band and cement-enamel interfaces than conventional GIC.


Assuntos
Infiltração Dentária , Cimentos Dentários , Esmalte Dentário , Cimentos de Ionômeros de Vidro , Humanos , Cimentos de Resina , Dente Decíduo
5.
J Contemp Dent Pract ; 21(3): 242-248, 2020 Mar 01.
Artigo em Inglês | MEDLINE | ID: mdl-32434968

RESUMO

AIM: To determine the effect of three different cavity disinfectants (2% chlorhexidine gluconate, 2.5% sodium hypochlorite, and 2% iodine solution) on microleakage in a seventh-generation dentin-bonding system. MATERIALS AND METHODS: Class V cavity was prepared on 50 extracted molars (n = 50). The respective experimental groups were treated with cavity disinfectants and Adper Easy One Bond. Preparations without cavity disinfectants worked as negative control and those with neither disinfectant nor dentin-bonding resin application worked as positive controls. After the cavity preparations were restored with resin composite (Filtek™ Z 350), the teeth were then subjected to dye leakage tests. Microleakage was assessed for both occlusal and gingival margins, using a stereomicroscope. Data were analyzed using (ANOVA; Kruskal-Wallis) test. RESULTS: No statistically significant differences were observed among 2% chlorhexidine gluconate, 2.5% sodium hypochlorite, and 2% iodine and also no statistically significant differences were observed between occlusal and gingival margins of groups. CONCLUSION: (1) 2% chlorhexidine gluconate, 2.5% sodium hypochlorite, and 2% iodine produced significantly higher microleakage when used with seventh-generation dentin-bonding agent. (2) 2% chlorhexidine gluconate produced lesser microleakage in comparison with 2.5% sodium hypochlorite and 2% iodine. (3) The gingival margins exhibited greater microleakage than occlusal margins. CLINICAL SIGNIFICANCE: The application of cavity disinfectants on prepared tooth before the application of dentin-bonding agent could help to reduce the potential risk of residual caries and postoperative sensitivity.


Assuntos
Infiltração Dentária , Desinfetantes , Restauração Dentária Permanente , Dentina , Adesivos Dentinários , Humanos
6.
J Appl Oral Sci ; 28: e20190499, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32348441

RESUMO

Enzymatic degradation of the hybrid layer can be accelerated by the activation of dentin metalloproteinases (MMP) during the bonding procedure. MMP inhibitors may be used to contain this process. Objective To evaluate the degree of conversion (DC%), dentin bond strength (µTBS) (immediate and after 1 year of storage in water), and nanoleakage of an experimental (EXP) and a commercial (SB) adhesive system, containing different concentrations of the MMP inhibitor GM1489: 0, 1 µM, 5 µM and 10 µM. Methodology DC% was evaluated by FT-IR spectroscopy. Dentin bond strength was evaluated by µTBS test. Half of beams were submitted to the µTBS test after 24 h and the other half, after storage for 1 year. From each tooth and storage time, 2 beams were reserved for nanoleakage testing. Data were analyzed using ANOVA and Tukey's test to compare means (α=0.05). Results All adhesive systems maintained the µTBS after 1 year of storage. Groups with higher concentrations of inhibitor (5 µM and 10 µM) showed higher µTBS values than groups without inhibitor or with 1 µM. The nanoleakage values of all groups showed no increase after 1 year of storage and values were similar for SB and EXP groups, in both storage periods. The inhibitor did not affect the DC% of the EXP groups, but the SB5 and SB10 groups showed higher DC% values than those of SB0 and SB1. Conclusions The incorporation of GM1489 in the adhesive systems had no detrimental effect on DC%. The concentrations of 5 µM GM1489 for SB and 5 µM or 10 µM for EXP provided higher µTBS than groups without GM1489, in the evaluation after 1 year of storage; whereas the concentration of inhibitor did not affect adhesive systems nanoleakage.


Assuntos
Cimentos Dentários/química , Dentina/química , Inibidores de Metaloproteinases de Matriz/química , Metacrilatos/química , Polietilenoglicóis/química , Ácidos Polimetacrílicos/química , Análise de Variância , Colagem Dentária/métodos , Corrosão Dentária/métodos , Infiltração Dentária , Dentina/efeitos dos fármacos , Humanos , Teste de Materiais , Valores de Referência , Reprodutibilidade dos Testes , Espectroscopia de Infravermelho com Transformada de Fourier , Estatísticas não Paramétricas , Propriedades de Superfície , Resistência à Tração , Fatores de Tempo
7.
Indian J Dent Res ; 31(1): 37-41, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32246679

RESUMO

Aim: To compare the microbial leakage of three root canal filling materials: AH Plus with Gutta-percha, Epiphany with Resilon, and Guttaflow using Enterococcus faecalis as the bacterial marker. Materials and Methods: In total, 30 caries free, human maxillary incisors with straight roots were used. The teeth were de-coronated with a diamond disc and the length was standardized for all specimens. Access opening was done through the coronal portion and the working length was determined. All the teeth were prepared to a standardized size apically and coronally. The teeth were then randomly divided into three experimental groups each. After obturation of the root canals, the outer surfaces of the teeth were coated with two layers of nail enamel except the apical 2 mm. The teeth were then subjected for bacterial leakage test using E. faecalis as a bacterial marker in dual chamber bacterial leakage model for a period of 30 days. Statistical Analysis Used: Chi-square test. Results: Results showed that Resilon/Epiphany (Group-2) demonstrated less leakage and Gutta-percha/AH Plus (Group-1) showed maximum leakage with the statistically significant difference between the two (P < 0.05). Guttaflow (Group-3) also showed less leakage than Gutta-percha/AH Plus (Group-1) with the statistically significant difference between the two (P < 0.05). There was no statistically significant difference between Resilon/Epiphany (Group-2) and Guttaflow (Group-3). Conclusion: Resilon/Epiphany and Guttaflow groups demonstrated less microbial leakage than Gutta-percha/AH Plus group.


Assuntos
Infiltração Dentária , Materiais Restauradores do Canal Radicular , Dimetilpolisiloxanos , Combinação de Medicamentos , Resinas Epóxi , Guta-Percha , Humanos , Obturação do Canal Radicular
8.
Am J Dent ; 33(2): 69-73, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32259410

RESUMO

PURPOSE: To evaluate marginal seal, adaptation, surface texture, and bubble presence of pit and fissure sealants when using a novel instrument (C-Shape It) or the manufacturers' supplied applicators for sealant placement into occlusal fissures. METHODS: Extracted molars with occlusal fissures were cleaned with pumice slurry and divided into six groups (n= 10/gp); three treatment and three control. Sealant materials placed included Ultraseal, Delton, and Helioseal. Excess water was removed per manufacturers' instructions. Sealants were applied with each applicator and with the C-Shape It to each group from cusp to cusp without covering marginal ridges, and the polymerization guidelines for photocuring were followed for all the groups. Samples were thermocycled at 500x between 5° and 55°C. Teeth were sectioned in a buccolingual direction with a minimum of four sections per tooth and examined under a light microscope at 50x and scored. RESULTS: Marginal seal, adaptation, penetration ability, surface texture, bubble formation and location of the sealants were analyzed using two-way ANOVA on ranks with a 95% confidence interval. The C-Shape It instrument showed consistently smoother surface texture (P< 0.001), which was statistically significant versus all manufacturers' applicators for all materials. Bubble presence was statistically significantly less with the instrument C-Shape It versus the manufacturers' applicators for all materials (P< 0.001). Results also revealed significant differences in marginal sealant adaptation. CLINICAL SIGNIFICANCE: C-Shape It demonstrated consistent ability to reduce bubbles and improve surface texture and adaptation in occlusal fissures for all pit and fissure products tested.


Assuntos
Infiltração Dentária , Selantes de Fossas e Fissuras , Bis-Fenol A-Glicidil Metacrilato , Dente Molar
9.
Braz Oral Res ; 34: e001, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-32022221

RESUMO

This study analyzed the effect of prior application of copaiba oil (CO) emulsions as a dentin cleaning substance on microleakage and microtensile adhesive strength. Twenty-five premolars and sixty-four molars were used for microleakage and microtensile assays. For the microleakage assays, specimens with standard class V cavities were divided (n = 5), according to the tested CO emulsions: CO10%X, CO10%Y, and CO10%Z, as well as chlorhexidine 2% (CHX) and distilled water (DW), as positive and negative controls, respectively. Restorations were performed using the Adper Single Bond® and/or Clearfil SE Bond® systems. Cervical, occlusal, distal and mesial sections were assessed for tracer penetration degree at the composite/tooth interface. For the microtensile assay, healthy molars were divided into sixteen groups, in which artificial caries were induced in half of the groups. Dentin surfaces were treated with CO10%X and CO10%Y, CHX and DW. Microtensile bond strength was measured by fixing each sample to the plate of a universal testing machine operated at a speed of 0.5 mm/minute until failure. Dentin treated with CO10%X showed a lower infiltration rate than dentin treated with the other CO emulsions, CHX2% and DW. According to the microtensile assay, both healthy and affected dentin treated with CO10%X and Adper Single Bond® adhesive system presented higher adhesive strength. CO emulsion, used as a dentin biomodifier, interfered positively in microleakage and improved adhesive strength after acid etching in the Adper Single Bond® adhesive system, or before applying the Clearfil SE Bond® self-etching system.


Assuntos
Colagem Dentária/métodos , Adesivos Dentinários/química , Dentina/efeitos dos fármacos , Fabaceae/química , Óleos Vegetais/química , Análise de Variância , Clorexidina/química , Resinas Compostas/química , Cimentos Dentários/química , Infiltração Dentária , Dentina/química , Emulsões/química , Humanos , Teste de Materiais , Reprodutibilidade dos Testes , Cimentos de Resina/química , Estatísticas não Paramétricas , Propriedades de Superfície , Resistência à Tração
10.
Dent Mater ; 36(1): e1-e8, 2020 01.
Artigo em Inglês | MEDLINE | ID: mdl-31791738

RESUMO

OBJECTIVE: To investigate the effects of natural collagen cross-linkers incorporation in phosphoric acid etchant on dentin biomodification, microtensile bond strength (µTBS) and nanoleakage (NL) of a two-step etch-and-rinse adhesive. METHODS: Experimental aqueous solution of 37% ortho-phosphoric acid were prepared with the addition of 2% biomodification agents: Lignin (LIG) from industrial paper production residue, Cardanol (CARD) from cashew-nut shell liquid, and Proanthocyanidin (PAC) from grape-seed extract. Negative control (NC) was acid solution without cross-linker whilst commercial control (CC) was Condac 37 gel (FGM). Dentin specimens were assayed by FTIR after 15s etching to detect collagen cross-linking. Extracted third molars were used for µTBS (n=7) and fracture mode analysis of Optibond S (Kerr), tested after 24h or 1000 thermal cycles. NL was surveyed by SEM. Statistical analysis was performed with two-way ANOVA and Tukey's test (p<0.05). RESULTS: FTIR confirmed cross-linking for all agents. µTBS of CC was the highest (46.6±6.2MPa), but reduced significantly after aging (35.7±5.2MPa) (p<0.001). LIG (30.6±3.7MPa) and CARD (28.3±1.8MPa) attained similar µTBS which were stable after aging (p>0.05). Fracture mode was predominantly adhesive. At 24h, all groups showed presence of silver uptake in hybrid layer, except CARD. After aging, CARD- and LIG-treated specimens exhibited little amount of silver penetration. CC, PAC and NC showed gaps, great nanoleakage at hybrid layer and presence of water channels in adhesive layer. SIGNIFICANCE: Altogether, ortho-phosphoric acid incorporated with LIG and CARD promotes stable resin-dentin bond strength with minor nanoleakage after aging, thereby achieving therapeutic impact without additional clinical steps.


Assuntos
Colagem Dentária , Infiltração Dentária , Colágeno , Cimentos Dentários , Dentina , Adesivos Dentinários , Humanos , Teste de Materiais , Ácidos Fosfóricos , Cimentos de Resina , Resistência à Tração
11.
Braz. dent. sci ; 23(3): 1-10, 2020. tab, ilus
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1096329

RESUMO

Objectives: This study aims to evaluate the degree of conversion (DC) and microlekage scores of three different composite resins polymerized with a LED curing device in standard and extra-power mode. Material and Methods: One bulk-fill (Tetric EvoCeram Bulk-Fill ­ TECBF) and two conventional composite materials (Clearfil Majesty Posterior ­ CMP and Tetric EvoCeram ­ TEC) were evaluated. A total of 30 specimens were prepared for six groups (N = 5). These groups were polymerized with a LED curing device as follows: TECBF-6: 3200mW/cm2 for six seconds, TECBF-20: 1000mW/cm2 for 20 seconds, CMP-6: 3200mW/cm2 for six seconds, CMP-20: 1000mW/cm2 for 20 seconds, TEC-6: 3200mW/cm2 for six seconds, TEC - 20: 1000 mW/cm2 for 20 seconds. After 24 hours of water storage, DC was measured by Raman spectroscopy. Microleakage scores of the six groups were bonded to various adhesive systems (Clearfil SE Bond or Adhese Bond Universal) were also evaluated at Class II box cavities (N = 10). Results: While the highest DC was found at the top (TECBF-20= 79.92% and TECBF-6= 79.02%) and bottom surfaces (TECBF-20 = 68.94% and TECBF-6= 71.04%) for TECBF groups, TEC groups (TEC-20top = 59.06%, TEC-6top=49.66%, TEC-20bottom = 43.72% and TEC-6bottom= 40.68%) showed the lowest DC for the both surfaces (p < 0.05). Polymerization of materials in standard or extra-power mode was similar to DC (p > 0.05). Microleakage scores were found to be similar (p > 0.05). Conclusion: According to the results of the study, different power densities of LED curing light did not affect the DC of composite resins and microleakage values of restorations at small Class II cavities (AU)


Objetivo: este estudo tem como objetivo avaliar os graus de conversão (DC) e microinfiltração de três diferentes resinas compostas polimerizáveis com um dispositivo de luz por LED nos modos padrão e no modo de alta-potência. Material e métodos: uma resina bulk-fill (Tetric EvoCeram Bulk-Fill - TECBF) e dois materiais resinosos convencionais (Clearfil Majesty Posterior - CMP e Tetric EvoCeram - TEC) foram avaliados. Um total de 30 espécimes foram preparados e divididos em seis grupos (N = 5). Esses grupos foram polimerizados com um dispositivo de luz de LED da seguinte forma: TECBF-6: 3200mW / cm2 por seis segundos, TECBF-20: 1000mW / cm2 por 20 segundos, CMP-6: 3200mW / cm2 por seis segundos, CMP20: 1000mW / cm2 por 20 segundos, TEC-6: 3200mW / cm2 por seis segundos, TEC - 20: 1000 mW / cm2 por 20 segundos. Após 24 horas de armazenamento em água, a DC foi medida por espectroscopia Raman. Os escores de microinfiltração dos seis grupos dos vários sistemas adesivos (Clearfil SE Bond ou Adhese Bond Universal) também foram avaliados nas cavidades Classe II (N = 10). Resultados: embora a maior CD tenha sido encontrada nas partes superior (TECBF-20 = 79,92% e TECBF-6 = 79,02%) e inferiores (TECBF-20 = 68,94% e TECBF-6 = 71,04%) para grupos TECBF, os grupos TEC (TEC-20top = 59,06%, TEC-6top = 49,66%, TEC-20bottom = 43,72% e TEC-6bottom = 40,68%) apresentaram as menores CD para as ambas as partes (p < 0,05). A polimerização de materiais no modo padrão ou alta-potência foi semelhante à DC (p > 0,05). Os escores de microinfiltração foram semelhantes (p > 0,05). Conclusão: de acordo com os resultados do estudo, diferentes densidades de potência da luz de LED não afetaram as CD das resinas compostas e os valores de microinfiltração das restaurações em pequenas cavidades da Classe II. (AU)


Assuntos
Análise Espectral Raman , Adesivos Dentinários , Resinas Compostas , Infiltração Dentária
12.
Braz. dent. sci ; 23(3): 1-10, 2020. tab, ilus
Artigo em Inglês | LILACS, BBO - Odontologia | ID: biblio-1096450

RESUMO

Objective: The aim of this study was to evaluate the influence of different crowns finishing line location on the crown tensile bond strength, marginal adaption and nanoleakage. Material and Methods: Sixty healthy third molars were collected. For tensile bond strength, a self-adhesive resin cement was used. For marginal adaption, epoxy resin models were prepared. Prior to tensile bond strength test, images for the epoxy resin models were measured under scanning electron microscopy (SEM). Nanoleakage was measured using same protocol. Failure mode was evaluated through SEM and classified: adhesive failure, cohesive in cement, cohesive in dentin, cohesive in resin composite, cohesive in enamel, and mixed. Statistical analysis was performed using Shapiro-Wilk and Kolmogorov Smirnov normality tests, two-way ANOVA, Bonferroni (posthoc) parametric test, with significance level of 5% (P < .05), Spearman correlation test. Results: tensile bond strength was not statistically different between the cemented groups with composite resin and ceramic. Cementation of ceramic was not statistically different between the groups (enamel, 3.28 Pa; dentin, 3.14 Pa; resin, 2.85 Pa). Marginal adaption was statistically different between resin and ceramic; finish line location varied between enamel and resin (175.91 µm vs. 433.58 µm). Nanoleakage rate was statistically different among all groups, except for resin: with resin (9.49%) and ceramic (9.35%). There was a predominance of adhesive failure in all groups. Conclusion: finish line location can be performed safely in enamel and dentin. Composite resinas substrate present an alternative, but still need to be more studied. Regarding the crown's material, it is possible to perform a satisfatory restoration in both: resin and ceramic. With ceramics presenting better results. (AU)


Objetivo: O objetivo deste estudo foi avaliar a influência da localização do término marginal na cimentação de coroas, na resistência à tração, adaptação marginal e nanoinfiltração, de acordo com os fatores: término marginal (dentina, esmalte e resina composta), e material restaurador (resina composta e cerâmica). Material e Métodos: Foram coletados 60 terceiros molares hígidos. Para o teste de resistência à tração, todas as amostras foram praparadas com término em chanfro e um cimento resinoso autoadesivo foi utilizado para a cimentação. Para a avaliação da adaptação marginal, foram confeccionados modelos em resina epóxica da linha de cimentação das amostras, previamente ao teste de tração, e submetidas à avaliação em microscopia eletrônica de varredura (MEV), para obtenção de imagens que posteriormente foram mensuradas. Para a nanoinfiltração, foram confeccionados fragmentos dos substratos e materiais restauradores, que foram cimentados com o mesmo protocolo. As amostras/imagens foram obtidas em MEV e mensurada a área infiltrada. O padrão de fratura foi avaliado através de imagens obtidas no MEV e classificados em: falha adesiva, coesiva em cimento, coesiva em dentina, coesiva em resina composta, coesiva em esmalte e mista. A análise estatística foi realizada utilizando os testes de normalidade Shapiro-Wilk e Kolmogorov Smirnov, ANOVA a dois fatores, teste paramétrico Bonferroni (post-hoc), com nível de significância de 5% (P <0,05), teste de correlação de Spearman. Resultados: a resistência à tração não foi estatisticamente diferente entre os grupos cimentados com resina composta e cerâmica. A cimentação da cerâmica não foi estatisticamente diferente entre os grupos (esmalte, 3,28 Pa; dentina, 3,14 Pa; resina, 2,85 Pa). A adaptação marginal foi estatisticamente diferente entre resina e cerâmica; a localização da linha de chegada variou entre esmalte e resina (175,91 µm vs. 433,58 µm). Para a nanoinfiltração foi estatisticamente diferente entre todos os grupos, exceto a resina: com resina (9,49%) e cerâmica (9,35%). Houve predomínio de falha adesiva em todos os grupos. Conclusão: a localização da linha de chegada pode ser realizada com segurança no esmalte e dentina. O substrato em resina composta apresenta uma alternativa promissora, mas ainda precisa ser mais estudado. Em relação ao material da coroa, é possível realizar uma restauração satisfatória tanto em resina composta quanto em cerâmica. Sendo a cerâmica, o material que apresentou melhores resultados. (AU)


Assuntos
Resistência à Tração , Ligas Metalo-Cerâmicas , Adaptação Marginal Dentária , Resinas Compostas , Infiltração Dentária
13.
Braz Oral Res ; 33: e111, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31800863

RESUMO

The aim of the present study was to evaluate the microtensile bond strength and the microleakage of a bulk-fill composite resin compared with a conventional incremental composite resin, in permanent molars and under cariogenic challenge using a Streptococcus mutans model. Permanent human third molars (n = 60) with an occlusal cavity of 5×3×2 mm were randomly allocated into four subgroups of restorative treatments: conventional composite resin with (n = 15) and without (n = 15) cariogenic challenge (Z350-E and Z350-C experimental and control groups, respectively), and bulk-fill composite resin with (n = 15) and without (n = 15) cariogenic challenge (Bulk Fill-E and Bulk Fill-C, respectively). Ten specimens from each subgroup were submitted to microtensile strength, and 5, to microleakage. The cariogenic challenge was conducted using the Streptococcus mutans strain (ATCC) for 7 days. The stickers obtained (1 × 1 × 2 mm) were submitted to a microtensile strength test, followed by classification of the fracture mode. Microleakage was performed using a scoring system. The data were analyzed by Kruskal-Wallis and Mann-Whitney tests (p < 0.05). Filtek Z350 XT resin presented higher microtensile bond strength than Bulk Fill resin without (19.02 ± 4.90 and 8.76 ± 3.94MPa, respectively; p < 0.001) and with cariogenic challenge (22.69 ± 7.86 and 13.31 ± 3.38MPa, respectively; p < 0.02). Z350-C and Bulk Fill-C resins presented a higher prevalence of mixed fractures (23 and 14%, respectively) in the specimens submitted to cariogenic challenge than those of the control groups, whereas microleakage was similar (p = 0.85). The conventional composite resin had higher microtensile bond strength than the bulk-fill resin, but both resin types had similar adhesion quality and microfiltration scores.


Assuntos
Biofilmes/efeitos dos fármacos , Resinas Compostas/química , Colagem Dentária/métodos , Streptococcus mutans/efeitos dos fármacos , Adesividade , Cárie Dentária , Esmalte Dentário/efeitos dos fármacos , Infiltração Dentária , Restauração Dentária Permanente/métodos , Humanos , Teste de Materiais , Reprodutibilidade dos Testes , Estatísticas não Paramétricas , Propriedades de Superfície , Resistência à Tração/efeitos dos fármacos , Fatores de Tempo
14.
Indian J Dent Res ; 30(5): 783-787, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31854374

RESUMO

Background: The purpose of this study was to investigate the behavior of a resin-based 2,2-bis (p-[2'-hydroxy-3'-methacryloxypropoxy] phenylene) propane and a composite resin modified with oxirane, regarding the ability of marginal sealing, both with direct restorations and indirect restorations. Materials and Methods: To achieve this, mesio- and disto-occlusal cavities were made on the same tooth, totalling 100 cavities. These cavities were restored with two materials, Filtek P90 (3M ESPE) and Opallis (FGM). Then, they were divided into two groups: Fifty direct restorations, each sample restored with the two materials, following the manufacturer's protocol and fifty indirect restorations, and then cemented with a paste obtained by diluting the resin in its adhesive. The templates were thermally cycled, 30 s at 5°C and 30 s at 55°C for 500 cycles and then were immersed in methylene blue for 24 h. Afterward, they were trimmed using a plaster trimmer from occlusal toward a gingival direction. These samples were analyzed with stereomicroscope (×3) by two blinded observers. Then, a system which considers the average number of surrounding walls that have suffered infiltration on a scale of 0-3 was used. Results: Data were subjected to statistical analysis (Mann-Whitney and Kruskal-Wallis tests) with a significance level of 5% maximum. Conclusion: It was concluded that the indirect restorations showed the greatest number of restorations with score 0 and 1 (34) and lowest score 2 and 3 (16). This suggests that indirect restorations regardless of the material used behaved more effectively regarding the marginal sealing of restorations.


Assuntos
Cárie Dentária , Infiltração Dentária , Resinas Compostas , Preparo da Cavidade Dentária , Adaptação Marginal Dentária , Restauração Dentária Permanente , Humanos , Teste de Materiais
15.
Hua Xi Kou Qiang Yi Xue Za Zhi ; 37(6): 571-576, 2019 Dec 01.
Artigo em Chinês | MEDLINE | ID: mdl-31875432

RESUMO

Resin composite, which is commonly used as a dental filling material, has some problems, such as poor wear resistance, polymerization shrinkage, and poor dentin marginal adaptability. Preheating of resin composite improves its pro-perties. This paper reviewed the effects of resin composite preheating on its monomer conversion, marginal microleakage, mechanical properties, and irritation on dental pulp.


Assuntos
Infiltração Dentária , Restauração Dentária Permanente , Resinas Compostas , Materiais Dentários , Teste de Materiais , Propriedades de Superfície
16.
Am J Dent ; 32(5): 219-222, 2019 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-31675188

RESUMO

PURPOSE: To compare the sealing properties of three pit and fissure (P&F) sealants, Embrace Wet Bond (EWB), a bioactive P&F sealant Embrace Wet Bond through the addition of modified calcium phosphate (MCP) (EWBMCP) and ClinPro (CLPR). The sealing properties of the materials were tested by means of a bacterial microleakage test. METHODS: 30 extracted intact human third molars were randomly assigned to three groups of 10 (n=10) teeth each. The teeth were cleaned with two passes of air abrasion, followed by rinsing for 20 seconds and then dried with compressed air for another 20 seconds leaving the enamel surface slightly moist. The coronal portion of each tooth was sectioned perpendicular to the long axis at the level of 4 mm below the top of the central fossa of the enamel. A parallel vertical channel 1 mm in diameter was prepared in the central fossa through the entire sample. All samples were sterilized with Gamma radiation. After etching the occlusal surface with 35% phosphoric acid gel followed by rinsing, the sealants were applied. The samples were stored at 37°C in SPB for 3 weeks, thermal cycled for 2,000× (5-55°C) and coated with nail varnish leaving 1 mm uncovered around the P&F material. Samples were then tested for microleakage of E. faecalis culture using a dual chamber leakage model. The broth in the lower chamber was checked daily for turbidity up to 90 days. Statistical significance was determined at P< 0.05. RESULTS: The median survival time for EWBMCP was significantly higher (P< 0.05) than for EWB and CLPR. With respect to bacterial microleakage frequency, EWBMCP and CLPR behaved significantly better than EWB. The bioactive sealant EWBMCP outperformed the other two tested sealants in terms of resistance to bacterial microleakage. Long-term clinical studies are recommended to confirm these in vitro findings. CLINICAL SIGNIFICANCE: Long term resistance to bacterial leakage of occlusal pit and fissure sealants will be beneficial to resisting the development of decay. A recently developed bioactive pit & fissure sealant offers that possibility and it is recommended that the findings are confirmed by clinical studies.


Assuntos
Infiltração Dentária , Selantes de Fossas e Fissuras , Condicionamento Ácido do Dente , Esmalte Dentário , Humanos , Teste de Materiais
17.
Indian J Dent Res ; 30(4): 573-578, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-31745055

RESUMO

Aim: The aim of this study was to determine the sealing ability of three different materials mineral trioxide aggregate (MTA) Plus, bone cement, and calcium sulfate with self-etch adhesive (SEA) for the repair of furcal perforation, using dye extraction method. Materials and Methods: Forty-eight extracted human permanent first and second molars were included and randomly divided into four groups: Group 1, n = 12, negative control, perforation not repaired with any material, Group 2, n = 12, perforation repair material used, MTA Plus, Group 3, n = 12, perforation repair material used, calcium sulfate with SEA, Group 4, n = 12, perforation repair material used, bone cement. The teeth were then coated with two coats of clear nail varnish immersed in methylene blue dye for 24 h, kept in 65% concentrated nitric acid for 3 days. Dye leakage was measured with the dye extraction method using a spectrophotometer at 550 nm. Results: The negative control showed the highest mean values of dye absorbance (1.45). Bone cement (0.94) came second. Calcium sulfate with SEA (0.58) and MTA Plus (0.32) had no significant difference in their dye absorbance values. Conclusion: Within the limitations of the study, MTA Plus showed the least microleakage followed by calcium sulfate with SEA which has shown promising results and can be used as an alternative followed by bone cement which showed the highest microleakage.


Assuntos
Infiltração Dentária , Materiais Restauradores do Canal Radicular , Compostos de Alumínio , Cimentos para Ossos , Compostos de Cálcio , Sulfato de Cálcio , Cimentos Dentários , Combinação de Medicamentos , Humanos , Óxidos , Silicatos
18.
J Contemp Dent Pract ; 20(7): 778-782, 2019 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-31597795

RESUMO

AIM: The present study aimed to assess the microleakage in primary teeth restored with tooth-colored materials using the dye penetration method. MATERIALS AND METHODS: A total of 60 healthy primary molar teeth were included in this study and standardized class II mesio-occlusal cavities were prepared on the samples. Consequently, these teeth were randomly divided into three experimental groups (n = 20 each group) such as group I: nano-filled resin-modified glass-ionomer, group II: nanocomposite resin, and group III: Cention N. After completing all the restorations, the restored teeth were subjected to 100 cycles of thermocycling. Next, all the surfaces of the tooth, except the restoration and a 1-mm zone adjacent to the restoration's margins, were covered with two coats of nail varnish. The coated teeth were then submerged in a 0.5% basic fuchsin dye solution. The teeth were then sectioned along the center of each restoration mesiodistally. Each part was visualized under a stereomicroscope at ×40 magnifications to assess microleakage. RESULTS: Out of all the included restorative materials, the least microleakage was demonstrated by teeth restored by the nano-filled resin-modified glass-ionomer (RMGI) group (1.05 ± 0.21) followed by the Cention N group (1.84 ± 0.14) and the nanocomposite resin group (3.10 ± 0.03). A statistical method involving the analysis of variance revealed a statistically significant difference among the different restorative materials. Multiple comparisons among the restorative materials showed a statistically significant difference between groups I and II and groups II and III restorative materials (p < 0.05). The dye penetration score 1 was more [11(55%)] for the nano-filled RMGI group, score 3 was more [12(60%)] for the nanocomposite resin group, and score 2 was more [9(45%)] for the Cention N group. CONCLUSION: The present study showed significantly less microleakage associated with the nano-filled resin-modified glass ionomer group than nanocomposite resin and Cention N groups. CLINICAL SIGNIFICANCE: Since many years, dentists have encountered a challenging problem with cervical lesions. Thus, an interdisciplinary treatment approach is the appropriate option in the management of carious teeth that involve gingival recession and cervical extension.


Assuntos
Infiltração Dentária , Resinas Compostas , Preparo da Cavidade Dentária , Restauração Dentária Permanente , Cimentos de Ionômeros de Vidro , Humanos , Dente Decíduo
19.
J Contemp Dent Pract ; 20(7): 822-827, 2019 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-31597802

RESUMO

AIM: The aim of this study is to evaluate the effect of multilayering incremental technique on the microleakage of high-viscosity bulk-fill composite restorations in endodontically treated teeth. MATERIALS AND METHODS: A total of 60 human mandibular premolar teeth were divided into four groups after standardized access preparation with a protaper technique followed by single-cone obturation to receive the following restorations for the access preparations. Group I (n = 20): bulk-fill composite (Filtek™ Bulk fill) using a bulk technique, group II (n = 20): bulk-fill composite (Filtek™ Bulk fill) using an incremental layering technique, group III (negative control) (n = 10): gutta-percha was kept intact at the access orifice and covered with a nail polish, and group IV (positive control) (n = 10): gutta-percha was kept intact at the orifice. The samples were thermocycled at 5°C and 55°C for 500 cycles followed by dye penetration with 2% methylene blue and then the scoring was done under a stereomicroscope at 10× magnification. The data so obtained were compared for microleakage using a Chi-square test. There was a significant difference among all the groups except groups II and III. RESULTS: Bulk-fill composites used with an incremental layering technique sealed significantly better than the other groups followed by bulk-fill composite in the bulk technique. CONCLUSION: Within the limitations of the present study, it can be concluded that the incremental layering technique with bulk-fill composites significantly decreases microleakage in the restored access preparations of endodontically treated teeth.


Assuntos
Infiltração Dentária , Dente não Vital , Resinas Compostas , Preparo da Cavidade Dentária , Restauração Dentária Permanente , Humanos , Viscosidade
20.
J Oral Implantol ; 45(6): 451-455, 2019 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-31580765

RESUMO

A gap exists at the implant-abutment interface in two-piece implants and can serve as a reservoir of bacteria and compromise the health of peri-implant tissue. This study aimed to compare the effect of different intermediate materials on bacterial leakage at the implant-abutment interface. A total of 75 implants were divided into 5 groups (n = 15) based on the material applied at the implant-abutment connection: (1) Atridox, (2) chlorhexidine, (3) Gapseal silicone, (4) saliva, and (5) no material. All the implants were inoculated with 0.1 µL of Aggregatibacter actinomycetemcomitans (A. actinomycetemcomitans) suspension, and then the respective material was applied. The abutments were connected to the implants, and appropriate torque was applied as recommended by the manufacturer (Implantium, Dentium, Korea, Seoul). Bacterial leakage was determined by evaluating the turbidity of the broth. Bacterial contamination was found in all samples at different times; in groups 1, 2 and 3, contamination was noted after 7, 5, and 6 days, respectively, on average. Contamination occurred averagely after 4 days in groups 4 and 5. The present study showed that Atridox applied at the implant-abutment interface significantly delayed bacterial leakage.


Assuntos
Implantes Dentários , Infiltração Dentária , Dente Suporte , Projeto do Implante Dentário-Pivô , Humanos , Torque
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