ABSTRACT
Objectives: CAD-CAM system is popular because of high esthetic and short fabrication
time. But, there is limited information available about the microtensile bonding of
luting cements to CAD-CAM inlays and to dentin. The aim of this study was to examine
the bond strength of CAD-CAM (Cerec 3) and pressed-ceramic (IPS Empress 2) inlays
to dentin surface by microtensile testing using two luting cements.
Materials and Methods: Standardized mesio-occlusal cavities were made in forty extracted
molar teeth. An occlusal reduction of 2 mm was made; the bucco-lingual width of the
proximal boxes was 4 mm, the occlusal width 3 mm and the depth of the pulpal and axial
walls 2 mm. The proximal boxes were extended 1 mm below the cemento-enamel junction.
Teeth were randomly assigned to 2 groups to evaluate the bonding of 2 ceramic systems,
Cerec 3 (Group I) and IPS Empress 2 (Group II), to dentin. Each of the 2 groups were
further divided into 2 luting cement groups, Panavia F (Group A) and Variolink II
(Group B). After cementation, the teeth were sectioned into two 1.2x1.2 mm wide ‘I’
shape sections. The specimens were then subjected to microtensile testing at a crosshead
speed of 1 mm/min. Twoway ANOVA and Tukey HSD tests were used to evaluate the results.
Results: The mean microtensile bond strengths of Cerec 3 and IPS Empress 2 bonding
to dentin with luting agents in MPa were Panavia F (13.98±3.44), Variolink II (14.19±3.12)
and Panavia F (15.12±3.15), Variolink II (15.45±3.08) respectively. No significant
differences were found among the 2 ceramic systems (P>.05) and 2 luting cements with
regard to dentin bond strengths (P>.05).
Conlusions: There was no difference found between the dentin bond strength of the
Cerec 3 and IPS Empress 2 inlays cemented with two luting cements. (Eur J Dent 2007;2:91-96)
Key words
Dentin - Bond strength - Resin cements - Inlay - CAD-CAM - IPS Empress
