RESUMO
In order to prolong the clinical longevity of resilient denture relining materials and reduce plaque accumulation, incorporation of antimicrobial agents into these materials has been proposed. However, this addition may affect their properties. OBJECTIVE: This study evaluated the effect of the addition of antimicrobial agents into one soft liner (Soft Confort, Dencril) on its peel bond strength to one denture base (QC 20, Dentsply). MATERIAL AND METHODS: Acrylic specimens (n=9) were made (75x10x3 mm) and stored in distilled water at 37ºC for 48 h. The drug powder concentrations (nystatin 500,000U - G2; nystatin 1,000,000U - G3; miconazole 125 mg - G4; miconazole 250 mg - G5; ketoconazole 100 mg - G6; ketoconazole 200 mg - G7; chlorhexidine diacetate 5% - G8; and 10% chlorhexidine diacetate - G9) were blended with the soft liner powder before the addition of the soft liner liquid. A group (G1) without any drug incorporation was used as control. Specimens (n=9) (75x10x6 mm) were plasticized according to the manufacturers' instructions and stored in distilled water at 37ºC for 24 h. Relined specimens were then submitted to a 180-degree peel test at a crosshead speed of 10 mm/min. Data (MPa) were analyzed by analysis of variance (α=0.05) and the failure modes were visually classified. RESULTS: No significant difference was found among experimental groups (p=0.148). Cohesive failure located within the resilient material was predominantly observed in all tested groups. CONCLUSIONS: Peel bond strength between the denture base and the modified soft liner was not affected by the addition of antimicrobial agents.
Assuntos
Resinas Acrílicas/química , Anti-Infecciosos/química , Bases de Dentadura , Colagem Dentária/métodos , Reembasamento de Dentadura/métodos , Clorexidina/química , Falha de Restauração Dentária , Cetoconazol/química , Teste de Materiais , Miconazol/química , Nistatina/química , Reprodutibilidade dos Testes , Propriedades de Superfície , Resistência à Tração , Água/químicaRESUMO
As restaurações confeccionadas pelos recentes sistemas cerâmicos apresentam uma aparência aproximada do dente natural por não interromper a transmissão de luz e, assim, possuir alta translucidez e profundidade de cor. Uma vez que estes sistemas possuem técnicas sensíveis de confecção, a adaptação marginal das coroas resultantes se torna crítica, sendo este um fator indispensável para o sucesso clínico das mesmas. Após revisar a literatura, com o propósito de levantar dados quanto à adaptação marginal de coroas totais confeccionadas pelos sistemas In-Ceram, IPS Empress e Procera, observou-se que toda a desadaptação encontrada para tais sistemas foi considerada, pelos autores, clinicamente aceitável.