A comparative evaluation of wear resistance of three types of artificial acrylic teeth after removing the glaze layer

Abstract

Background: The posterior denture teeth wear faster than the anterior teeth, which can result
in occlusal interferences, loss of vertical dimension of occlusion, greater stress accumulation in the
anterior region, and higher ridge resorption. This study aimed to compare the wear resistance of
three types of artificial acrylic teeth before and after removing the glaze layer.
Materials and Methods: This in vitro study compared three types of artificial acrylic teeth, namely,
Finex (F), SR Orthotyp DCL (S), and Vita Physiodents (V) in six groups (n = 10). Half of the artificial
teeth of each brand underwent 0.5‑mm buccal reduction to remove the glaze layer (groups FC,
SC, and VC). The teeth were thermocycled and placed in a chewing simulator. The teeth with and
without the glaze layer were weighed before and after the wear test. The data were analyzed using
ANCOVA (the level of significance was 0.05).
Results: The weight reduction (indicative of wear) was 0.03 ± 0.02 and 0.12 ± 0.03 mg in Groups S
and SC, 0.03 ± 0.02 and 0.25 ± 0.04 mg in Groups V and VC, and 0.11 ± 0.15 and 0.28 ± 0.1 mg
in groups F and FC, respectively. Removing the glaze layer (P < 0.01), type and brand of acrylic
tooth (P < 0.01), and the baseline weight of artificial teeth (P < 0.01) had significant effects on wear
resistance of artificial teeth.
Conclusion: The wear of artificial teeth was greater after removing the glaze layer, and the
magnitude of wear was also significantly different among the three brands. The group FC showed
maximum wear while the groups S and V showed minimum wear.
Key Words: Artificial, dental restoration wear, polymethyl methacrylate, tooth