Available online 3 November 2018
Research and Education
Available online 3 November 2018
Abstract
Statement of problem
How contamination, cleaning, and artificial aging affect the
bond strength of self-adhesive resin cements to zirconia ceramics is unclear.
Purpose
The purpose of this
in vitro
study was to assess the durability and bond strength of different
self-adhesive resin cements to zirconia ceramics subjected to
contamination, cleaning, and aging.
Material and methods
A total 192 zirconia ceramic squares were airborne-particle abraded with 50 μm Al2O3
at a pressure of 100 kPa. The specimens were then divided into 4 main
experimental groups (n=48) according to the type of self-adhesive resin.
Specimens in the subgroups (n=16) were exposed to 3 different treatment
methods: alcohol bath cleaning only, contamination with saliva and
alcohol bath cleaning, and contamination with saliva and cleaning with
Ivoclean followed by alcohol bath cleaning. Bonded specimens were stored
in distilled water (37°C), either for 3 days with no thermocycling or
for 150 days interrupted by 37 500 thermocycles between 5°C and 55°C.
After storage, the bond strength was determined using a universal
testing machine. Results were analyzed statistically, using
nonparametric tests.
Results
After saliva contamination, the tensile bond strength for all specimens decreased significantly (P<.001).
Furthermore, after saliva contamination and during 150 days of water
storage with thermocycling, all specimens debonded spontaneously.
However, use of the cleaning medium (Ivoclean) significantly increased
the tensile bond strength for almost all specimens (P<.05).
Conclusions
Saliva
contamination significantly negatively influenced the bond strength and
durability to zirconia ceramic. Ceramic cleaning using Ivoclean
significantly improved the bond strength to saliva contaminated zirconia
ceramics.
Comments