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Quasistatic Mechanical Testing for Computer-Aided Design and Manufacturing Occlusal Veneers Cemented to Milled Dentin Analog Material
Published on: December 20, 2024
Effect of different surface treatments on the bond strength between light-polymerized hard chairside relining
Thi Khanh An Nguyen1, Tamaki Hada2, Maiko Iwaki3
1Graduate student, Gerodontology and Oral Rehabilitation, Graduate School of Medical and Dental Sciences, Institute of Science Tokyo, Yushima, Bunkyo, Tokyo, Japan.
Statement Of Problem:
A chairside light-polymerized hard relining material has been developed to overcome the limitations of autopolymerizing resins that include the exothermic reaction, odor, and prolonged polymerization time. However, its adhesion to computer-aided design and computer-aided manufacturing (CAD-CAM) denture base materials remains unclear.
Purpose:
The purpose of this in vitro study was to evaluate the tensile bond strength between a chairside light-polymerized hard relining material and 5 CAD-CAM milled denture base materials subjected to different surface treatments both before and after thermal cycling.
Material And Methods:
The CAD-CAM milled disk materials included an autopolymerized Fit Resin (FR) poured into a disk-shaped mold and 4 prefabricated disk materials: Ivotion Base (IB), M-PM Disk (MPM), Denture Disk (DD), and KZR-CAD Denture PC (KZR). Specimens (15×15×10 mm) were prepared and divided into 3 surface treatment groups: no treatment (NT), bur roughening (BR) using a flame-shaped crosscut tungsten carbide bur, and airborne-particle abrasion (AA) with 50-μm Al₂O₃. The relining material (HIKARELINER) was applied with its corresponding adhesive and light polymerized according to the manufacturer's instructions. The specimens were stored in distilled water at 37 °C for 24 hours or subjected to 10 000 thermal cycles between 5 and 55 °C. Tensile bond strength was tested in a universal testing machine, and failure modes were examined microscopically. Data were analyzed using 2-way ANOVA and Bonferroni-adjusted comparisons (α=.05).
Results:
IB exhibited the lowest initial bond strength (P<.05) and the highest frequency of adhesive failure. Thermal cycling significantly reduced the bond strength of FR, MPM, and DD (P<.001), while IB and KZR were unaffected. KZR exhibited the highest postcycling bond strength (P<.001). BR and AA significantly increased initial bond strength compared with NT (P<.001); however, only AA maintained bond strength after thermal cycling.
Conclusions:
The highly cross-linked structure of IB limited adhesion, whereas KZR showed the most stable bonding performance. AA was the most effective surface treatment for achieving durable bond strength with light-polymerized reline materials.
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