[Frequency of pre-eruptive intracoronal resorption in panoramic radiographs of peruvians: a cross-sectional study].

Objective: To determine the frequency of Preeruptive Intracoronal Resorption (PIR) in a sample of digital panoramic radiographs of Peruvian patients between 3 to 21 years of age who attended an oral and maxillofacial radiology center between 2013 and 2021.

Material And Methods: This observational study was descriptive, retrospective and cross-sectional. A sample of 1897 digital panoramic radiographs was evaluated to determine the frequency of PIR and its covariates of location, depth, and inclination of the affected teeth.

Procedural errors detected by cone beam tomography in cases with indication for retreatment: cross-sectional study.

Objectives: This study aimed to investigate the frequency and type of endodontic procedural errors in cases indicated for retreatment through cone-beam computed tomography (CBCT) analysis.

Materials And Methods: The sample consisted of 96 CBCT scans, encompassing 122 permanent teeth with fully formed roots. Errors included perforation, instrument fracture, canal transportation, missed canals, and inadequate apical limit of filling.

[Comparison of the precision of two electronic apical locators in teeth with simulated perforations].

Objective: The purpose of the study was to compare the precision of the Propex Pixi and Raypex 6 electronic apical locators in determining the working length of teeth with simulated perforations at different levels of the root canal.

Materials And Methods: 36 uniradicular lower premolars were used with a canal randomly divided into three groups of 12 teeth each. In the first group two simulated perforations were made at the middle and apical level.

Efficacy of Controlled Memory and Shape Memory Nickel Titanium Instruments in Removing Filling Material from Severely Curved Root Canals: An Study.

Introduction: The aim of the present study was to compare the efficacy of four NiTi instruments with different properties (shape memory and control memory), in both rotary and reciprocating motions, during retreatment procedures.

Methods And Materials: Mesial canals of thirty-two mandibular molars were instrumented, obturated, and then scanned with" Cone-beam Computed Tomography" (CBCT). Teeth were randomly divided into 4 groups (=8) according to each system: "Shape Memory" (SM) instruments including Reciproc (R25 file) and ProTaper Next (X3 and X2 file), "Controlled Memory" (CM) instruments including WaveOne Gold (Primary file) and Hyflex (30.

[Experiences and impact of an ethics of research training.].

This article has the purpose to describe achievements and impact of the ethics of research training at the Interdisciplinary Center for Studies on Bioethics of the University of Chile, which has served as incentive, motivation and guide for professionals which require knowledge, regulations application and dialogue skills to reflect on problems of this discipline. Furthermore, it describes how this knowledge generates a multiplying effect in aspects such as participation in scientific ethical review committees, course organization and the creation and development of research lines, which generate publications by post degree students. It also narrates didactic contents and strategies which could be applied in ethics and bioethics courses for oral health students and concludes mentioning practical applications of this training for teaching, research and institutional development.

[Not Available].

This article focuses on the need to examine the graduate and postgraduate studies of the surgeon-dentist in Peru. The presence of an ethic normative in scientific investigation generated by the University is analysed from the training of the professor's point of view. The paper also focuses on the knowledge and attitudes entailed with ethics and bioethics in the odontologist's shaping.