Valoración del ángulo de convergencia de las preparaciones : estudio in-vitro semestre B-2019.

Abstract

Introduction: The angle of convergence (AC) is the angle formed by opposite walls of the dental preparation, when measured against the long axis of the tooth, allowing complete adaptation of the restoration. Objective: The objective of the study was to identify if the students of the eighth cycle of the UCSG approach or not the ideal CA in the pre-clinic of the chair of Fixed Partial Prosthesis II. Materials and methods: The present research work is in-vitro, descriptive, analytical and bibliographic. The sample consisted of 100 ivorine teeth, which were evaluated for the presence of irregularity in the margin, height, angle of each axial wall and the angle of convergence with the ImageJ software. Results: After the evaluation it was obtained that 56% of the students use the rounded tip conical cutter, that 58% of the preparations presented margins with continuity, the general average of the convergence angle was BL 29.04 ° and MD 19.78 °, finally the incisocervical dimension was 3.73 mm, while the occlusocervical dimension was 2.54mm. Discussion: The angle of convergence made by students was greater than recommended by the literature, since many authors recommend that AC should be performed from 2 ° to 5 ° but because they are unattainable angles, other authors recommend from 10 ° to 20 ° , since they are accessible angles. Conclusion: Significant differences were found between the convergence angles produced by students compared to the literature.