Statement of problem
Even though mechanical retentive features, such as grooves, are incorporated into
the surface of titanium alloy temporary cylinders, a reliable bond to veneering provisional
materials is not always achievable for screw-retained provisional implant restorations.
There is insufficient information about the effect of tribochemical silica coating
on the bond strength between provisional materials and grooved titanium alloy temporary
cylinders.
Purpose
The purpose of this study was to evaluate, in vitro, the effect of an airborne-particle
abrasion and silica-coating technique on the bond strength between grooved titanium
alloy temporary cylinders and provisional veneering bisphenol-A glycidyl methacrylate
and polymethyl methacrylate materials.
Material and methods
Forty grooved titanium alloy (Ti-6Al-4V) internal connection implant temporary cylinders
were used. A disc of veneering material (7.1 × 3.4 mm) was created around the midsection
of each cylinder. Forty specimens were divided into 4 groups (n=10): group NoTxPMMA,
no surface treatment and polymethyl methacrylate veneering material; group NoTxBisGMA,
no surface treatment and BisGMA veneering material; group AbPMMA, airborne-particle
abrasion, silica-coating surface treatment (Rocatec), and polymethyl methacrylate;
and group AbBisGMA, airborne-particle abrasion, silica-coating surface treatment (Rocatec),
and BisGMA. Each specimen was subjected to ultimate shear load testing at the interface
of the veneering material and the temporary cylinder in a universal testing machine
at a constant crosshead speed of 5 mm/min. Data were analyzed with a 1-way ANOVA (α=.05)
followed by post hoc Student-Newman-Keuls test. Each specimen underwent surface observation
with a light microscope at ×40 magnification to compare fracture patterns.
Results
Airborne-particle abrasion and silica-coating surface treatment significantly lowered
the shear bond strength (P<.05). The type of provisional material did not significantly affect the shear bond
strength, with or without surface treatment. Group AbBisGMA demonstrated the lowest
mean value (3.49 MPa) compared to the other groups.
Conclusions
Airborne-particle abrasion and silica-coating treatment did not improve the bond between
grooved titanium alloy temporary cylinders and provisional veneering materials. It
weakened the provided mechanical retention, especially when it was used with BisGMA
veneering material. Material choice, whether it was polymethyl methacrylate or BisGMA,
did not make a statistically significant difference.
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Article info
Footnotes
First place winner of the Pacific Coast Society for Prosthodontics/Journal of Prosthetic Dentistry Graduate Student competition at the Pacific Coast Society for Prosthodontics annual meeting, Sunriver, Ore, June 2009.
Identification
Copyright
© 2011 The Editorial Council of the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
