ABSTRACT
Objetivo: Este ensaio clínico randomizado avaliou o comportamento de restaurações com resina composta bulk-fill flow em dentes posteriores após três anos do tratamento restaurador. Métodos: Dezessete pacientes (12 mulheres, 5 homens, idade 23-59) foram selecionados para ter pelo menos duas restaurações de amálgama ou de resina composta substituídas, ou receber tratamento restaurador para lesão cariosa. As cavidades foram aleatoriamente alocadas para receberem o compósito bulk-fill flow Suferil SDR Flow, oclusamente coberto por uma resina composta convencional nano-híbrida Esthet-X HD (técnica bulk and body), ou serem preenchidas exclusivamente com Esthet-X HD, inseridas em incrementos de 2mm cada técnica incremental). Um adesivo convencional de dois passos foi aplicado em todas as cavidades. Trinta e quatro restaurações Classes I ou II foram realizados em dentes posteriores (n=17) no início do estudo (baseline). Após 03 anos, os critérios do USPHS modificado e FDI foram utilizados para avaliar as restaurações. Os dados foram submetidos à análise estatística Mann-Whitney (p<0,05). Resultados: No acompanhamento de 3 anos, vinte e quatro restaurações (17 Classes I e 7 Classes II) foram avaliadas. Não foram detectadas diferenças entre as técnicas restauradoras (p>0,05). Não houve falha em nenhuma restauração ao longo do tempo. Conclusão: Após 03 anos de serviço clínico, todas restaurações utilizando um compósito bulk-fill flow em dentes posteriores demonstraram uma performance satisfatória. Significância Clínica: A qualidade geral das restaurações em dentes posteriores realizadas com a técnica bulk and body foi similar ao das restaurações incrementais utilizando um compósito nano-híbrido. (AU)
Objective: This randomized clinical trial evaluated the behavior of restorations with flowable bulk-fill resin composite in posterior teeth three years after the restorative treatment. Methods: Seventeen patients (12 women, 5 men, age 23-59) were selected to have at least two failing amalgam or resin restorations replaced and/or to have a carious lesion restored. The cavities were randomly allocated to receive either the flowable bulk-fill composite Surefil SDR Flow occlusally covered with the conventional nano-hybrid composite Esthet-X HD (bulk and body technique) or filled exclusively with Esthet-X HD placed in 2 mm increments (incremental technique). A two-step etch-and-rinse adhesive was applied in all cavities. Thirty-four Class I or II restorations were performed in posterior teeth (n=17) during baseline. After 03 years, modified USPHS and FDI criteria were used to evaluate the restorations. Data were subjected to Mann-Whitney statistical analysis (p<0.05). Results: At the 3-year follow-up, twenty-four restorations (17 Class I and 7 Class II) were evaluated. No diff erences were detected between the bulk and body and the incremental restorations (p>0.05). No restoration failures were observed over time. Conclusion: After 03 years of clinical service, all restorations using a flowable bulk-fill composite in posterior teeth showed an acceptable performance. Clinical Significance: The overall quality of posterior restorations made with the bulk and body technique was similar to that of restorations made with a nano-hybrid composite incrementally placed. (AU)
Subject(s)
Humans , Male , Female , Adult , Middle Aged , Young Adult , Composite Resins , Dental Restoration, Permanent/methods , Bicuspid , Double-Blind Method , Follow-Up Studies , Statistics, Nonparametric , MolarABSTRACT
O objetivo deste trabalho foi realizar uma avaliação clínica retrospectiva de restaurações diretas de Classes I e II em resina composta, realizadas por alunos de graduação da Faculdade de Odontologia da UFRGS. Foram avaliadas 103 restaurações em resina composta (46 Classe I e 57 Classe II), seguindo uma modificação dos métodos USPHS e FDI. O tempo de permanência em boca das restaurações avaliadas variou entre 8 e 61 meses. O principal motivo para reparo ou substituição das restaurações Classe I foi em função da recorrência de cárie (8,7%), seguido de brilho superficial (8,6%), de acordo com o método FDI. Para as restaurações Classe II, o principal motivo de falha foi fratura e retenção (29,8%), seguido de integridade dental (24,5%). De acordo com a avaliação pelo método USPHS, o critério descoloração marginal teve a maior taxa de falha para restaurações Classe I (17,4%), seguido por cárie secundária (13%). Para restaurações Classe II, descoloração marginal foi o critério que mais falhou (16%), seguido por adaptação marginal (13,7%). A taxa total de falha dos métodos USPHS e FDI para restaurações Classe I foi de 32,6% e 20%, e para restaurações Classe II foi de 36,8% e 49,1%, respectivamente. Conclui-se que as restaurações Classe I avaliadas demonstraram um desempenho clínico positivo, com a maior parte dos critérios classificados como excelentes, bons e satisfatórios, dentro do tempo avaliado. Grande parte das restaurações Classe II demonstrou um desempenho insatisfatório ou deficiente em algum dos critérios avaliados...
The goal of this work was to perform a retrospective clinical evaluation of direct composite resin Class I and Class II restorations performed by students from UFRGS School of Dentistry.A total of 103 composite resin restorations (46 Class I and 57 Class II) were evaluated, following a modification of the USPHS and FDI methods. The evaluated restorations lifetime varied between 08 and 61 months.According to the FDI method, the main reason for the Class I restorations repair or replacement was because of recurrent caries (8.7%), followed by superficial brightness (8.6%). For class II restorations, the main failure reason was fracture and retention (29,8%), followed by dental integrity (24,5%). According to the USPHS method, superficial staining presented the highest failure rate for Class I (17,4%), followed by recurrent caries (13%). For Class II, superficial staining showed the highest failure rate (16%), followed by marginal adaptation (13,7%). Total failure rate for USPHS and FDI methods for Class I restorations was 32,6% e 20%, and for Class II restorations was 36,8% e 49,1%, respectively.It was concluded that the evaluated Class I restorations presented a positive clinical performance, with most criteria classified as excelent, good and satisfactory, in the evaluated period. A significant part of Class II restorations presented a insatisfatory or deficient performance in some evaluated criteria...
Subject(s)
Humans , Longevity , Dental Restoration, Permanent/methods , Dental Restoration, Permanent , Survival RateABSTRACT
AIM: The objective of this study was to evaluate the use of MMPs inhibitors (chlorhexidine and EDTA) in bond strength and quality of the hybrid layer of adhesive restorations in normal dentin using two ethanol-based total-etch adhesive systems. MATERIAL AND METHODS: Thirty-two extracted human molars were coronally sectioned and randomly divided into 8 groups (n=4), depending on the surface pre-treatment and adhesive system used. The total-etch adhesive systems Single Bond 2 (2-step) and Adper Scotchbond Multi-Purpose Plus (3-step) were used as follows: 1) according to manufacturer's instructions (etching with 37% phosphoric acid (H3PO4) for 15 s); 2) etching with H3PO4 for 15 s, followed by 2% chlorhexidine for 120 s; 3) etching with 0.1 M EDTA for 60 s; 4) etching with 0.1 M EDTA followed by 2% chlorhexidine for 120 s. Teeth were incrementally restored with composite resin (Filtek Z350XT). After water storage for 24 h, teeth were double-sectioned, yielding stick specimens of 1.0 mm² bonded area, and then subjected to microtensile bond strength (MTBS) test at 0.5 mm/min. Additional specimens were gold-sputtered to be analyzed under scanning electron microscopy (SEM). Data (in Mega Pascal) were subjected to Kruskal-Wallis and Dunn (p <0.05) tests. RESULTS: The etching protocol (37% H3PO4 or EDTA) interfered with hybrid layer formation, monomer penetration and the MTBS. Funnel shaped resin tags were observed when dentin was etched with 37% H3PO4. In these specimens, MTBS were also higher. EDTA conditioning produced thin hybrid layers and smaller MTBS, regardless the adhesive system used. Chlorhexidine application after conditioning resulted in no apparent differences between both evaluated techniques (37% H3PO4 or EDTA). CONCLUSION: The use of chlorhexidine as a MMP inhibitor does not alter immediate bond strength values and does not interfere with hybrid layer formation.
Subject(s)
Humans , Male , Female , Chlorhexidine , Dentin-Bonding Agents , Metalloproteases , DentinABSTRACT
Este estudo teve por objetivo analisar in vitro o efeito inibitório de materiaisres tauradores contendo o monômero antibacteriano brometo demetacriloiloxidodecilpiridínio (MDPB) no desenvolvimento de lesões de cárie secundária em raízes dentárias submetidas a um desafio cariogênico. Cavidades com características de cavidades classe V (2 mm x 2mm) foram preparadas emsetenta e cinco fragmentos de raízes dentárias humanas. As amostras foram divididas aleatoriamente em 5 grupos (n=15 amostras/grupo) e restauradas como segue: (I) sistema adesivo sem MDPB + resina composta sem MDPB (controle negativo); (II) cimento de ionômero de vidro resino-modificado (CIV-RM, controle positivo); (III) sistema adesivo sem MDPB e resina composta com MDPB (2,83%MDPB); (IV) sistema adesivo contendo MDPB e resina composta sem MDPB; e (V)sistema adesivo contendo MDPB e resina composta contendo MDPB. Lesões decárie secundária radicular foram produzidas utilizando-se um modelo bacteriológico de indução de cáries artificiais. As amostras restauradas foram imersas em um meio de cultura contendo Streptococcus mutans e sacarose por 15 dias. Fatias (80 ± 20μm) das amostras foram utilizadas para a mensuração da média das profundidades das lesões formadas adjacentes à ambas as margens das restaurações através de microscopia de luz polarizada...
This in vitro study aimed to analyze the potential of restorative materials containing the antibacterial monomer 12-methacryloyloxydodecylpyridinium bromide (MDPB) for controlling the advance of bacterial induced secondary root caries-like lesions. ClassV cavities (2 mm x2 mm) were prepared in seventy-five human root fragments. Specimens were randomly divided in 5 groups (n=15 fragments per group) and restored as follows: (I) MDPB-free adhesive system + MDPB-free composite(negative control); (II) resin modified glass ionomer (RM-GIC; positive control); (III)MDPB-free adhesive system + MDPB-containing composite (2.83% MDPB); (IV)MDPB-containing adhesive system + MDPB-free composite; (V) MDPB-containing adhesive system + MDPB-containing composite. Artificial secondary root caries lesions were produced by a biological artificial caries challenge. The restored specimens were immersed into a culture medium containing Streptococcus mutans and sucrose for 15 days...
Subject(s)
Root Caries/diagnosis , Dental Caries , Dentistry/methods , StreptococcusABSTRACT
This study evaluated the influence of curing tip distance, shade and filler particle size on Vickers microhardness (VHN) of composite resins. Two composites were tested: Filtek Z250 microhybrid (3M ESPE; shades A1 and A3.5) and Filtek Supreme nanofilled (3M ESPE; shades A1B and A3.5B). For each resin, 42 specimens (5 mm in diameter and 2 mm height) were prepared being 21 for each shade. The specimens were exposed using a 20-second exposure to a quartz-tungsten-halogen light source with an irradiance of approximately 560 mW/cm², at the following distances: 0 mm (surface contact), 6 mm and 12 mm from composite surface. Effectiveness of cure of different resins, shades and curing distances was determined by measuring the top and bottom hardness (VHN) of specimens using a digital microhardness tester (load: 50 g; dwell time: 45 seconds) 24 hours following curing. The hardness ratio was calculated by dividing VHN of the bottom surface by VHN of top surface. Three-way ANOVA and Tukey's post-hoc test (p<0.05) revealed statistically significant differences for all analyzed factors. As for top hardness, as microhardness ratio (bottom/top), the factors shade, distance and composite filler particle size exerted influence on resin curing. Lighter shade composites (A1 and A1B) showed higher hardness values. At 6 and 12 mm curing tip distances, hardness was lower when compared to 0 mm. The microhybrid composite resin presented higheer hardness, being its microhardness ratio satisfactory only at 0 mm for both shades and at 6 mm for the lighter shade. The nanofilled composite resin did not present satisfactory microhardness at the bottom while the microhybrid composite resin had higher hardness than the nanofilled. Composite's curing tip distance and shade can influence hardness.
ABSTRACT
A demand increase for aesthetic procedures in Dentistry has been observed due to the crescent interests of patients and the evolution of aesthetic restorative materials. The dental files of patients assisted at the clinic of the graduation course of restorative dentistry, School of Dentistry, University of São Paulo, were analyzed during the period from 1998 to 2003, with the purpose of accomplishing an evaluation of the assisted population as well as a longitudinal comparative study of the percentage of class I and class II restorations with amalgam or composite resin in posterior teeth placed by dental students. In the analyzed period, the amalgam was used in 28.5% of the class I and 27.5% of the class II whereas the composite resin was used in 32.1% of the class I and 11.9% of the class II restorations. Although the class I posterior composite resin restorations had been made in a higher proportion and an increase of these procedures was observed, the class II amalgam restorations were predominant along the analyzed period. The prevalent group was between 31 and 40 years old and female gender. Although there were prevalence of class II amalgam restorations placed, there was an increase of the resin composite restorations in posterior teeth when compared with amalgam restorations, mainly in class I cavity restorations, probably due to its conservative characteristics.