Abstract
Statement of problem
Demand is increasing for polyetheretherketone (PEEK) as a fixed dental prosthesis
core material. However, information is lacking about how the precision of these restorations
is affected by the fabrication procedures.
Purpose
The purpose of this in vitro study was to evaluate the influence of different fabrication
techniques on the marginal precision of PEEK single-crown copings.
Material and methods
A stainless-steel master die was designed to simulate a prepared mandibular second
molar to receive ceramic crowns. Thirty PEEK copings were fabricated and divided into
3 groups (n=10) according to the fabrication technique: milled from a prefabricated
PEEK blank by using a computer-aided design and computer-aided manufacturing (CAD-CAM)
system (PC); pressed from prefabricated PEEK pellets (PP); and pressed from PEEK granules
(PG); in addition, 3-mol yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP)
copings (n=10) were produced by using the same CAD-CAM system and served as a control.
Marginal precision measurements (in μm) were recorded at 4 reference points on each
coping by using a digital microscope. The data obtained were statistically analyzed
by using 1-way ANOVA and the pair-wise Tukey (HSD) test to study the difference between
group mean values (α=.05).
Results
The overall mean ±standard deviation marginal gap at the marginal opening for the
copings was 78 ±10 μm for PEEK granules copings, 72 ±9 μm for PEEK pellet copings,
45 ±6 μm for PEEK CAD-CAM copings, and 43 ±1 μm for the 3Y-TZP CAD-CAM control. A
statistically significant difference was found between the milled and pressed copings
as indicated by the ANOVA test (P<.001). The pair-wise Tukey honestly significant difference (HSD) test showed a nonsignificant
difference (P>.05) between milled 3Y-TZP and milled PEEK copings; moreover, no significant difference
was observed between the PEEK copings pressed from pellets or granules (P>.05).
Conclusions
The marginal precision of PEEK CAD-CAM–fabricated copings showed significantly lower
mean marginal gap values than PEEK pressed copings. The marginal gap mean values recorded
were all within a clinically acceptable range (120 μm).
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Article info
Publication history
Published online: July 04, 2020
Identification
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© 2020 by the Editorial Council for The Journal of Prosthetic Dentistry.
