RESUMO
STATEMENT OF PROBLEM: Ultrahigh-speed tooth preparation can traumatize the hard dental tissues and the dental pulp. PURPOSE: This in vitro study examined the relationship between different grits of diamond burs on the temperature response within a pulpal chamber during tooth preparation with a turbine. MATERIAL AND METHODS: Newly extracted, undamaged third molars were secured by a rapid-tensioning device mounted on an air-supported slide. NiCrNi thermocouples were inserted apically and used to determine the temperature within a pulpal chamber. The grinding tests used cylindrical fine, coarse, and ultracoarse diamond burs. RESULTS: The maximal temperature elevation within the pulp was 3.2 degrees C, and the most pronounced rise in temperature occurred with ultracoarse burs. Temperature increases in the pulpal chambers and grinding times or temperatures of the cooling water were approximately proportional. Residual dentinal thickness was inversely proportional to temperature elevation within the pulpal chamber. CONCLUSIONS: This study demonstrated that coarse diamond burs resulted in more pronounced temperature increases within the pulpal chamber during tooth preparation. In addition, the benefit of short intervals between grinding steps and a cooling water temperature between 30 degrees C and 32 degrees C was confirmed. A cooling temperature of 38 degrees C to 43 degrees C did not afford actual cooling.
Assuntos
Regulação da Temperatura Corporal , Equipamentos Odontológicos de Alta Rotação , Cavidade Pulpar/fisiologia , Preparo do Dente/instrumentação , Equipamentos Odontológicos de Alta Rotação/estatística & dados numéricos , Diamante , Humanos , Técnicas In Vitro , Dente Serotino , Projetos de Pesquisa , Estatísticas não Paramétricas , Temperatura , Preparo do Dente/estatística & dados numéricosAssuntos
Resinas Compostas/química , Adesivos Dentinários/química , Cimentos de Ionômeros de Vidro/química , Preparo do Dente/métodos , Animais , Bovinos , Colagem Dentária/estatística & dados numéricos , Técnicas In Vitro , Teste de Materiais/métodos , Teste de Materiais/estatística & dados numéricos , Estatísticas não Paramétricas , Resistência à Tração , Preparo do Dente/estatística & dados numéricosRESUMO
Three postgraduate prosthodontic students served as clinicians/evaluators in a study rating their preferences for three different diamond cutting instruments from three manufacturers. Each evaluator prepared the axial walls of complete veneer crowns on extracted molar teeth and then ranked their preference of the instruments. To prepare nine teeth, each of the three instruments was used in random order and without knowledge of the specific manufacturer. The methodology for analyzing the evaluators' preferences and the results are discussed.
