Micro-hardness of Acrylic Resin utilized for Provisional Crowns: Effect of different polymerization techniques and pH-Cycling

Authors

  • César Augusto Zanlorenzi Nicodemo Bauru School of Dentistry - University of São Paulo
  • Carlos Eduardo Edwards Rezende Bauru School of Dentistry - University of São Paulo
  • Rafael Tobias Moretti-Neto Alfenas Federal University
  • José Henrique Rubo Bauru School of Dentistry - University of São Paulo

DOI:

https://doi.org/10.14295/bds.2013.v16i2.896

Abstract

Objective: This study aimed at evaluating the micro-hardness of an acrylic resin used for provisional crowns. Materials and methods: Five different processing techniques (direct and indirect) were assessed: (I) auto polymerizing resin in sandy stage; (II) auto polymerizing resin in plastic stage; (III) bead-brush technique; (IV) auto polymerizing resin under pressure; (V) heat-cured acrylic resin under pressure. Five specimens were made for each test group. For the initial micro-hardness test, the specimens were immersed in deionized water for 48 hours. For the analysis of the final micro-hardness, the specimens were subjected to pH-cycling to simulate the changes in the pH level which occur in the oral cavity. Results: Tests revealed that the micro-hardness was decreased after the pH-cycling. However, no statistical difference was found among the different types of acrylic resin polymerization techniques. Conclusion: It was concluded that the micro-hardness is not directly related to the polymerization technique for making provisional crowns.

Author Biographies

César Augusto Zanlorenzi Nicodemo, Bauru School of Dentistry - University of São Paulo

DDS

Carlos Eduardo Edwards Rezende, Bauru School of Dentistry - University of São Paulo

PhD Student, Department of Prosthodontics

Rafael Tobias Moretti-Neto, Alfenas Federal University

Professor, Department of Clinics and Surgery.

José Henrique Rubo, Bauru School of Dentistry - University of São Paulo

Associate Professor, Departament of Prosthodontics.

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Published

2013-06-24

Issue

Vol. 16 No. 2 (2013): Apr. - Jun. / 2013 - Published June 2013

Section

Clinical or Laboratorial Research

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