THE EFFECT OF CHEMICAL AND MECHANICAL TREATMENT OF THE DENTURE BASE RESIN SURFACE ON THE SHEAR BOND STRENGHT OF DENTURE REPAIRS

Authors

  • Maryam Memarian
  • Mahdieh Shayestehmajd

DOI:

https://doi.org/10.7213/aor.v5i1.23257

Keywords:

Denture repair, Chemical surface treatment, Mechanical surface treatment, Shear bond strength

Abstract

OBJECTIVE: This study was aimed to evaluate the effect of three surface treatment methods on the shear bond strength of denture repairs. MATERIAL AND METHOD: 40 specimens (15 x 15 x 7mm) were fabricated according to the manufacturers’ instructions from each of three denture base materials: a heat-cured acrylic resin (VeracrilTM), a rapid-setting heat-cured acrylic resin (QC-20TM), and a pourable resin (Selecta PlusTM). The samples of each material were divided into four groups of ten. One of the groups served as a control and underwent no surface treatment. The other groups received one of three surface treatments: air blasting with 50μm aluminum oxide particles at 0.5 MPa pressure for 5 seconds; immersion in methyl methacrylate (MMA) for 180 seconds or immersion in acetone for 3 seconds. An autopolymerizing repair resin (Rapid RepairTM) was applied to the bonding area (6 mm in diameter, 2 mm in height) and polymerized at a pressure of two bar for 30 minutes using a pressure pot. All specimens were subjected to 10,000 thermal cycles. The shear bond strength (MPa) of the specimens was measured in a universal testing machine at a 1 mm/min crosshead speed. The effect of the mechanical and chemical treatments on the surface of the base resins was examined using SEM. Statistical tests used were 2 way ANOVA and Kolmogorov-Smirnov. The level of statistical significance was established at (p<0.05). RESULTS: There were statistically significant differences between bond strength in surface treatment levels across acryl level categories (p=0.042). The results also showed differences between treatment levels (p=0.0001).Abrasive blasting significantly increased the bond strength of the repair material, but there were no significant differences between the bond strengths of the control group and the experimental groups treated with MMA or acetone. Examination by SEM revealed that chemical treatment with MMA or acetone produced a smooth surface similar to the control group, while airborne-particle abrasion produced a porous surface. CONCLUSION: Mechanical surface treatment prior to denture base repair resulted in a significant improvement in the shear bond strength of the base material.

Downloads

Download data is not yet available.

Published

2009-11-29

How to Cite

Memarian, M., & Shayestehmajd, M. (2009). THE EFFECT OF CHEMICAL AND MECHANICAL TREATMENT OF THE DENTURE BASE RESIN SURFACE ON THE SHEAR BOND STRENGHT OF DENTURE REPAIRS. Archives of Oral Research, 5(1). https://doi.org/10.7213/aor.v5i1.23257

Issue

Section

Articles