ABSTRACT
Background: To outline the current evidence on root morphological changes after enlarging the apical foramen with NiTi instruments. Material and Methods: A search was performed in the Virtual Health Library, PubMed, EMBASE, Scopus, Web of Science, Science Direct and SciELO databases, in addition to a manual search in Google Scholar, between January 2017 and October 2023. Articles published in English that describe in vitro studies investigating root morphological changes after instrumentation 1 mm beyond the major apical foramen were included. The quality of evidence in the included studies was also analyzed. Results: The search retrieved 367 articles. Of these, four studies were eligible for data synthesis and analysis, all of them in vitro studies. Synthesis of the results of these in vitro studies showed a larger number of root morphological changes such as experimental dentinal microcraks in samples submitted to instrumentation beyond the apical foramen when compared to micro-CT images obtained before preparation. Conclusions: The in vitro studies analyzed in this scoping review indicate that instrumentation beyond the major foramen of the root canal, promotes morphological changes in this area and that the adoption of standardized methodologies would not only increase the accurate detection and characterization of these changes but also facilitate the application of these findings in clinical trials and patient care. Key words:Endodontics, apical morphology, root canal preparation.
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...
