[Factors influencing the survival of amalgam restoration in Bangkok metropolitan school children].

The purpose of this study was to find out the factors influenced on the survival of amalgam dental restoration. The study population was the amalgam restoration of 726 molar teeth, 3 restoration types, cavity class I, class I other surface and class I compound, of Bangkok Metropolitan school children aged 6-12 years. The data showed how the survival of restoration placed in teeth varied with the restoration aged ranging 6-30 months. The result indicated that there were 48.10% of broken filling and 19.42% of secondary caries. The rate of broken filling was significantly related to the child age at the time of treatment, the restoration age, the surface texture of the restoration and the restoration type (p less than 0.01). As for the rate of secondary caries, there were significant correlation with the surface texture of the filling, the restoration type and the factor "broken filling" (p less than 0.01). By means of the linear multiple regression, it told us explicitly about the magnitude of the relation that the surface texture of the filling was the major influential factor which could predict the variance of broken filling about 18.29% while the broken filling was also the major influential factor which could predict the variance of secondary caries about 7.93%.