[Effects of post-cure heat treatment on the bond strength of ceramage composite resins for titanium casting using different surface treatments].
OBJECTIVE
This study aims to investigate the effects of post-cure heat treatment (PCHT) on the bond strength of Ceramage composite resins for titanium casting using different surface treatments.


METHODS
Metal specimens (n=30) were randomly divided into following five groups: polishing (group A), sandblasting (group B), acid etching after sandblasting (group C), PCHT after sandblasting (group D), and PCHT after sandblasting and acid etching (group E). The specimens were then processed and coated with Ceramage composite resins according to the grouping. After treatment, the shear bond strengths and microhardness of the specimens were evaluated. The fracture surface morphology of the titanium-Ceramage composite resin was observed using a scanning electron microscope.


RESULTS
The shear bond strengths of groups A to E were (5.92 +/- 0.54), (10.25 +/- 0.55), (14.97 +/- 0.88), (14.41 +/- 0.63), and (19.95 +/- 0.52) MPa, respectively. No statistical difference was found between groups C and D, whereas the rest of the groups showed statistically significant differences (P < 0.01). Visible polymerization residues were found on titanium porcelain metal surface of groups B to E. The microhardness values of groups D and E were higher than those of groups B and C (P < 0.05).


CONCLUSIONS
PCHT significantly improves the bond strength and surface microhardness of Ceramage composite resins for titanium casting.
Dept. of Prosthodontics, The Affiliated Hospital of Medical College, Qingdao University, Qingdao 266003, China.
Jie
J
Liu
Dept. of Prosthodontics, The Affiliated Stomatology Hospital, Jiamusi University, Jiamusi 154002, China.
Fanyu
F
Meng
Dept. of Prosthodontics, The Affiliated Stomatology Hospital, Jiamusi University, Jiamusi 154002, China.
Hao
H
Wu
D000134:Acid Etching, Dental; D003188:Composite Resins; D001840:Dental Bonding; D003776:Dental Porcelain; D006358:Hot Temperature; D008422:Materials Testing; D033081:Shear Strength; D017640:Silicates; D013499:Surface Properties; D014025:Titanium
D003188:Composite Resins; D017640:Silicates; C574687:ceramage; D003776:Dental Porcelain; D014025:Titanium