RESUMO
Endodontic treatment makes the tooth brittle due to loss of bulk of tooth structure, decrease in the moisture content of dentin and dentin elasticity. The following study was carried out to evaluate the effect of endodontic treatment on the fracture resistance of the tooth and reinforcing ability of three different core materials. The following study comprised of sample size of 30 deciduous second molars divided into control group (6) and test group (24). Access opening was done in 24 and 18th teeth with access opening were restored with three different core materials namely IRM (6), silver amalgam (6), GIC (6). All the 30 were subjected to fracture test using UTM (Universal testing machine)- Instron 95. Result showed a drastic reduction in the fracture resistance of the tooth on access opening (1/3rd) and out of the three core materials glass ionomer was shown to be the best core material giving the highest fracture registrance followed by silver amalgam and IRM.
Assuntos
Materiais Dentários/química , Restauração Dentária Permanente/métodos , Dente Molar/patologia , Fraturas dos Dentes/fisiopatologia , Dente Decíduo/patologia , Dente não Vital/terapia , Amálgama Dentário/química , Análise do Estresse Dentário/instrumentação , Cimentos de Ionômeros de Vidro/química , Humanos , Teste de Materiais , Metilmetacrilatos/química , Pulpectomia/métodos , Preparo de Canal Radicular/métodos , Prata/química , Cimento de Óxido de Zinco e Eugenol/químicaRESUMO
BACKGROUND: The aim of this study was to evaluate the efficacy of intensive application of sodium fluoride varnish in prevention of caries in molars in children between 6 and 7 years and to evaluate the caries status in molars before and after application of fluoride varnish (Cavity Shield). MATERIALS AND METHODS: Two hundred fifty children (6-7 years) randomized into varnish and control groups. Children in varnish group received fluoride varnish (Cavity Shield) three times during one week (once every 2 days). Clinical and radiographical examinations of all children were performed prior to the first application of varnish and 1 year later. For evaluation and comparison, all the collected data were subjected to statistical analysis. RESULTS: At the end of 1 year period, varnish group had 27.7% caries reversal in deciduous dentition which was statistically significant. Though there was a decrease in the caries increment in the permanent dentition, it was not statistically significant. CONCLUSION: Application of fluoride varnish Cavity Shield three times once a week, once a year either in permanent or in deciduous dentition, is associated with substantial reduction in caries increment. CLINICAL SIGNIFICANCE: Fluoride varnish can prove to be an effective tool in prevention of dental caries in both primary and permanent dentitions.
