Estudo Comparativo da Microinfiltração Marginal em Cavidades Classe II Restauradas com Cimentos de Ionômero de Vidro Convencionais e Resinosos

Abstract

Infiltração dentária; Cimentos de ionômero de vidro; Dentes decíduos. Dental leakage; Glass ionomer cements; Primary teeth. Marginal Microleakage in Class II Cavities Restored with Conventional and Resin-Modified Glass Ionomer Cements: a Comparative Study Objective: To evaluate the level of microleakage in class II cavities prepared in human primary molars restored with 2 conventional (Maxxion R and Vidrion R) and 2 resin-modified (Vitremer and Vitro Fill LC) glass ionomer cements. Method: Nineteen human primary molars were chosen from a tooth bank. Class II cavities with standardized dimensions were prepared with cylindrical diamond burs on the mesial and distal surfaces of each tooth. The cavities were then restored with 2 conventional glass ionomer cements [Maxxion R (G1) and Vidrion R (G2)] and 2 resin-modified glass ionomer cements [Vitremer (G3) and Vitro Fill LC (G4)]. The restored teeth were coated with 2 layers of nail polish (Colorama ®) and, after drying of the polish, the teeth were immersed in a 50% silver nitrate solution for 24 hours. Next, all teeth were cut longitudinally through the restoration center and examined with a stereomicroscope and the microleakage was evaluated by qualitative criteria based on the attribution of scores. Results: All materials presented varied microleakage levels, but Vitremer (G3) presented the best results. No statistically significant differences were observed among Maxxion R (G1), Vidrion R (G2) and Vitro Fill LC (G4). Conclusion: None of the tested glass ionomer cements was capable to completely prevent microleakage occurrence, but Vitremer presented the lowest microleakage scores, while the Maxxion R, Vidrion R and Vitro Fill LC did not differ significantly from each other.