RESUMO
Posterior composite resins have gained considerable importance over last few years. However, improper placement techniques continue to be a prime cause of failure of these restorations. This study was done to compare the microleakage at the tooth restoration interface extending below cementoenamel junction when posterior composite restorations were placed directly in the cavity or when placed over a glass ionomer cement liner, both chemically cured and light cured. The results have shown that light cured glass ionomer when used as a liner under a composite restoration used below gingival cementum/dentin margin has the best sealing capability.
Assuntos
Condicionamento Ácido do Dente , Análise de Variância , Bis-Fenol A-Glicidil Metacrilato/química , Corantes/diagnóstico , Resinas Compostas/química , Colagem Dentária , Forramento da Cavidade Dentária , Preparo da Cavidade Dentária/métodos , Cemento Dentário/patologia , Esmalte Dentário/patologia , Infiltração Dentária/classificação , Restauração Dentária Permanente , Dentina/patologia , Adesivos Dentinários/química , Cimentos de Ionômeros de Vidro/química , Humanos , Umidade , Luz , Ácidos Polimetacrílicos/química , Estatística como Assunto , Propriedades de Superfície , Temperatura , Termodinâmica , Colo do Dente/patologiaRESUMO
This study was undertaken to assess the efficacy of three luting cements, namely, glass ionomer, zinc phosphate and zinc polycarboxylate in retainng the preformed stainless steel crowns in-vivo. Twenty subjects, with an indication for restoration of three primary molars with stainless steel crowns, were selected. Sixty teeth were taken up for the study, and twenty crowns were cemented with each of the three luting cements. After an eight month follow up the crowns were assessed for their presence/ absence or "rocking". Statistical analysis was done using Chi-square test. The results have shown no significant difference in retentivity of stainless steel crowns with the use of either of the three luting agents.