ABSTRACT
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.