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[Bonding performance evaluation between the new nano-hydroxyapatite composite resin and dentin].

PURPOSE
To evaluate the shear bond strength and bonding ability between the new nano-hydroxyapatite composite resin and tooth structure.


METHODS
Thirty-six healthy isolated molars were randomly assigned to 3 groups according to the material employed: new nano-hydroxyapatite composite resin, composite resin karisma and glass ionomer cement. After thermal cycling, the data of shear bond strength was recorded, and the type of specimen fracture section was observed under stereo microscope. The data was analyzed statistically by SPSS17.0 software package.


RESULTS
The average shear bonding strength of nano-hydroxyapatite composite resin was (11.23±4.6082) N/mm(2), and that of composite resin charisma and glass ionomer cement was (14.49±7.9855) N/mm(2) and(10.08±6.3701) N/mm(2), respectively. No significant difference was found among 3 groups. The bonding fracture mode of each specimen had no significant difference(P>0.05).


CONCLUSIONS
As a new dental restorative material, new nano-hydroxyapatite composite resin has superior bonding ability and can be used in clinical therapy. Supported by Natural Science Foundation of Shandong Province (Y2008C159).