ABSTRACT
The main aim is to evaluate the cyclic fatigue resistance of blue heat-treated instruments with different kinematics. Twenty-four endodontic instruments of the same brand were used for each of three experimental groups: VB (Vortex Blue 40/0.04), RB (RECIPROC Blue 40/0.06), and XB (X1 Blue 40/0.06). The instruments were randomly distributed and subjected to temperatures of 20°C and 37°C. The fatigue test was performed using a stainless steel device. Data were analysed using the Shapiro-Wilk test, Student's t-test, the F test, and Tukey's and Tamhane tests at significance level P=0.05. The instruments' cyclic fatigue resistance at both temperatures differed significantly for each instrument type (P < 0.001). The RB instruments displayed greater cyclic fatigue resistance at the tested temperatures compared with the VB and XB instruments (P < 0.001). Reciprocating kinematics positively influenced cyclic fatigue resistance. Blue heat-treated instruments showed decreased cyclic fatigue resistance as the temperature increased (P < 0.001).
ABSTRACT
Introdução: As perfurações dentárias comunicações entreas estruturas de suporte e os canais radiculares sãopassíveis de acontecer durante o tratamento endodôntico. A conduta utilizada no momento da perfuração é imprescindível para o bom prognóstico do elemento dentário. Objetivo: Avaliaro conhecimento sobre a conduta a ser utilizada pelos acadêmicos de Odontologia nos casos de perfuração daregião de furca de molares permanentes. Material e Métodos:Trata-se de uma pesquisa quantitativa, exploratória e descritiva. O instrumento de coleta de dados foi um questionário com dez questões, respondido por 179 acadêmicos de Odontologia do 5º ao 10º período...
Introduction: Dental perforations communication between support structures and root canals - are likely to happen during endodontic treatment. The appropriate management of a perforation is essential for the good prognosis of the tooth. Objective: To evaluate the knowledge of dental students on how to manage cases of furcation perforation inpermanent molars. Material andMethods:This was aquantitative, exploratory and descriptive research study. The data collection instrument was a questionnaire with tem questions answered by 179 dental students from the 5th tothe 10th course semester...
