title: Effect of pre-processing surface treatments of acrylic teeth on bonding to the denture base.
abstract: The aim of this study was to examine the bond strength between acrylic teeth after various surface treatments and processing with either a heat- or microwave-polymerized denture base material. Specimens were prepared and tested according to the methods described in American National Standard/American Dental Association Specification No.15 (Synthetic Polymer Teeth) using a special assembly. Three brands of acrylic teeth were used with the following treatments: control (no treatment), grinding and grinding plus sandblasting. Treatment groups were further divided into two denture base processing subgroups: heat-polymerized and microwave-polymerized methods. Denture base processing to the acrylic teeth was performed according to the manufacturer's recommendations. Bond strength test was performed using a universal testing machine with five specimens and each specimen is composed of six anterior teeth per experimental group. Data were analysed using a three-way anova and the Scheffe'F-test post hoc pair wise comparison at the 95% significance level. The mean bond strength values ranged from 33.1 +/- 4.1 to 51.6 +/- 2.5 MPa. The bond strength values of sandblasted surfaces were significantly higher than those of the ground surface and the control (P < 0.05). Combined (acrylic tooth and denture base resin) cohesive failures were disclosed in all tested samples. Acrylic tooth surface pre-processed surface treatment with grinding plus sandblasting and processed with a heat-polymerized denture base provided the greatest bond strength between acrylic tooth and denture base.
authors.affiliation: Department of Restorative Dentistry, School of Dentistry, University of Washington, Seattle, WA 98195-7456, USA. akchung@u.washington.edu
authors.forename: K-H
authors.initials: KH
authors.lastname: Chung
authors.forename: C Y
authors.initials: CY
authors.lastname: Chung
authors.forename: C Y
authors.initials: CY
authors.lastname: Chung
authors.forename: D C N
authors.initials: DC
authors.lastname: Chan
mesh_terms: D001840:Dental Bonding; D003764:Dental Materials; D003819:Denture Bases; D003780:Denture Repair / Q000379:methods; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D019904:Polymethyl Methacrylate; D033081:Shear Strength; D013499:Surface Properties; D014093:Tooth, Artificial
chemical_list: D003764:Dental Materials; D019904:Polymethyl Methacrylate