Comparative study of the shear bond strength of various veneering materials on grade II commercially pure titanium.
OBJECTIVE
To compare the shear bond strength of various veneering materials to grade II commercially pure titanium (CP-Ti).


METHODS
Thirty specimens of CP-Ti disc with 9 mm diameter and 10 mm height were divided into three experimental groups. Each group was bonded to heat-polymerized acrylic resin (Lucitone 199), porcelain (Triceram), and indirect composite (Sinfony) with 7 mm diameter and 2 mm height. For the control group (n=10), Lucitone 199 were applied on type IV gold alloy castings. All samples were thermocycled for 5000 cycles in 5-55℃ water. The maximum shear bond strength (MPa) was measured with a Universal Testing Machine. After the shear bond strength test, the failure mode was assessed with an optic microscope and a scanning electron microscope. Statistical analysis was carried out with a Kruskal-Wallis Test and Mann-Whitney Test.


RESULTS
The mean shear bond strength and standard deviations for experimental groups were as follows: Ti-Lucitone 199 (12.11 ± 4.44 MPa); Ti-Triceram (11.09 ± 1.66 MPa); Ti-Sinfony (4.32 ± 0.64 MPa). All of these experimental groups showed lower shear bond strength than the control group (16.14 ± 1.89 MPa). However, there was no statistically significant difference between the Ti-Lucitone 199 group and the control group, and the Ti-Lucitone 199 group and the Ti-Triceram group. Most of the failure patterns in all experimental groups were adhesive failures.


CONCLUSIONS
The shear bond strength of veneering materials such as heat-polymerized acrylic resin, porcelain, and indirect composite to CP-Ti was compatible to that of heatpolymerized acrylic resin to cast gold alloy.
Department of Oral and Maxillofacial Surgery, College of Medicine and Medical Research Institute, Chungbuk National University, Cheongju, Republic of Korea.
Eun-Young
EY
Lee
Department of Dentistry, School of Medicine, Ewha Womans University, Seoul, Republic of Korea.
Sul-Gi
SG
Jun
Department of Prosthodontics, University of North Carolina School of Dentistry, Chapel Hill, NC, USA.
Robert F
RF
Wright
Department of Dentistry, School of Medicine, Ewha Womans University, Seoul, Republic of Korea.
Eun-Jin
EJ
Park
Bond strength; Heat-polymerized acrylic resin; Indirect composite; Porcelain; Titanium; Veneering material