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Abstract(s)
Introdução: A preparação dentária para uma coroa total é um procedimento traumático para a estrutura dentária e muitas vezes afeta a vitalidade pulpar. Vários são os fatores associados ao trauma pelo preparo dentário como, o aumento de temperatura devido ao calor friccional gerado que, pode ocasionar desde hipersensibilidade dentária a necrose pulpar. Existe um valor crítico estabelecido de temperatura intrapulpar de 42,5˚C, a partir do qual os danos serão irreversíveis.
Objetivo: Estudo-piloto, para clarificar a influência da usura na variação da temperatura de fricção detetada à superfície dentária durante o preparo para coroas totais.
Materiais e Métodos: Durante a execução de preparos dentários para coroas totais em prótese fixa realizaram-se medições das temperaturas máximas atingidas na superfície dentária com o termómetro PCE-889. Foram selecionados três grupos de brocas com diferentes graus de usura. Os dados foram tratados estatisticamente pelo SPSS® (IBM Corp. Released 2011. IBM SPSS Statistics for Windows, Version 20.0. Armonk, NY: IBM Corp.). Usou-se ainda Anova One-Way, a normalidade de distribuição foi analisada com o teste de Shapiro-Wilk e a homogeneidade de variâncias com o teste de Levene. O nível de significância considerado foi p ≤ 0,05.
Resultados: Existiram diferenças significativas na temperatura de fricção produzida pelos três tipos de brocas quando esta foi determinada ao fim de 2 minutos, p<0,05. As temperaturas máximas atingidas com cada broca foram: nova, 32,35˚C (5min); usura ligeira, 34,25˚C(2min); usura considerável, 32,77˚C(2min).
Conclusão: Durante este estudo piloto detetaram-se valores de temperatura de fricção que podem causar dano pulpar. Em função dos resultados obtidos, a amostra adequada para o futuro estudo é de 137 elementos.
Introduction: Crown preparations are destructive to underlying tooth tissue and can affect the pulp vitality. Several factors are associated with the trauma by tooth preparation including the increased of temperature due to frictional heat which can cause dental hypersensitivity to pulpal necrosis. There is a critical value set intrapulpal temperature of 42,5˚C, from which damages will be irreversible. Objectives: By using a pilot study, we expect a clarification as to the influence of usury in the temperature variation of the tooth surface friction detected during preparation for crowns. Materials and Methods: During the execution of dental preparation for full crowns in fixed prosthodontic were performed measures of high level temperatures observed in dental surface by PCE-889 thermometer. Three groups of burs with different degrees of usury were selected. Statistical analysis of the data was performed using SPSS® (IBM Corp. Released 2011. IBM SPSS Statistics for Windows, Version 20.0. Armonk, NY: IBM Corp.). Anova One-Way was also used, the normality of distribution was assessed with the Shapiro-Wilk test and the homogeneity of variances with the Levene test. It was considered a significance level of ≤ 0,05. Results: There were significant differences in the friction temperature of the three types of burs only when it was determined 2 minutes after, p <0.05. The maximum temperatures of which group of burs were: new, 32,35˚C (5min); light wear, 34,25˚C (2min); widely wear, 32,77˚C(2min). Conclusion: During this pilot study was detected values of friction temperatures which can cause pulpal damages. In function of results, the sample size ideal for future study is 137 elements
Introduction: Crown preparations are destructive to underlying tooth tissue and can affect the pulp vitality. Several factors are associated with the trauma by tooth preparation including the increased of temperature due to frictional heat which can cause dental hypersensitivity to pulpal necrosis. There is a critical value set intrapulpal temperature of 42,5˚C, from which damages will be irreversible. Objectives: By using a pilot study, we expect a clarification as to the influence of usury in the temperature variation of the tooth surface friction detected during preparation for crowns. Materials and Methods: During the execution of dental preparation for full crowns in fixed prosthodontic were performed measures of high level temperatures observed in dental surface by PCE-889 thermometer. Three groups of burs with different degrees of usury were selected. Statistical analysis of the data was performed using SPSS® (IBM Corp. Released 2011. IBM SPSS Statistics for Windows, Version 20.0. Armonk, NY: IBM Corp.). Anova One-Way was also used, the normality of distribution was assessed with the Shapiro-Wilk test and the homogeneity of variances with the Levene test. It was considered a significance level of ≤ 0,05. Results: There were significant differences in the friction temperature of the three types of burs only when it was determined 2 minutes after, p <0.05. The maximum temperatures of which group of burs were: new, 32,35˚C (5min); light wear, 34,25˚C (2min); widely wear, 32,77˚C(2min). Conclusion: During this pilot study was detected values of friction temperatures which can cause pulpal damages. In function of results, the sample size ideal for future study is 137 elements
Description
Keywords
Preparos para coroas totais Temperatura nos tecidos dentários Usura das brocas diamantadas Termómetros de infravermelhos Estudo piloto Tooth preparation for full crown Temperature on dental tissues Wear of burs Iaser thermometers Pilot study