Comparison the degree of enamel wear behavior opposed to Polymerinfiltrated ceramic and feldspathic porcelain

Abstract

Background: The degree of tooth enamel wear is an important aspect of the clinical acceptability
of all‑ceramic restorations. The purpose of this study was to compare the degree of enamel wear
by feldspathic porcelain and polymer‑infiltrated ceramic.
Materials and Methods: In this in vitro study, 10 polymer‑infiltrated ceramics were prepared by
creating the sections of Vita Enamic® blocks (18 mm × 14 mm × 4 mm). A total of 10 porcelain
cylinders were built, and feldspathic porcelain (VMK 95, Vita) was used and fired over the metal
discs. A total of 20 human maxillary premolars were assigned as antagonist. Then, 10 teeth
were arranged and placed oppose to porcelain samples and 10 others were placed oppose to
polymer‑infiltrated‑ceramic specimens in the chewing simulator. The samples were photographed
before and after the chewing simulation. The difference between the two photograph was measured
by stereomicroscope and Motic Image plus software 2.0 three times, and then, the mean of these
three times was recorded as the amount of wear. Data were analyzed using independent samples
t‑test and SPSS version 16. The level of significancy was 0.05.
Results: The mean wear rate teeth oppose to the feldspathic porcelain group (377.294 μ) was
significantly higher than that of the polymer‑infiltrated ceramic group (101.755 μ) (P = 0.002).
Conclusion: In the present study, the amount of enamel wear of the natural teeth opposed to
polymer‑infiltrated ceramic was significantly lower than feldspathic porcelain.
Key Words: Enamel wear, feldspathic porcelain, polymer‑infiltrated ceramic