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http://dx.doi.org/10.4041/kjod.2013.43.1.23

The effect of casein phosphopeptide amorphous calcium phosphate on the in vitro shear bond strength of orthodontic brackets  

Park, Sun-Youn (Department of Orthodontics, College of Dentistry, Yonsei University)
Cha, Jung-Yul (Department of Orthodontics, College of Dentistry and Institute of Craniofacial Deformity, Yonsei University)
Kim, Kyoung-Nam (Research Institute of Dental Biomaterials and Bioengineering, BK21 Project, College of Dentistry, Yonsei University)
Hwang, Chung-Ju (Department of Orthodontics, College of Dentistry and Institute of Craniofacial Deformity, Yonsei University)
Publication Information
The korean journal of orthodontics / v.43, no.1, 2013 , pp. 23-28 More about this Journal
Abstract
Objective: The purpose of this study was to evaluate the effect of casein phosphopeptide amorphous calcium phosphate (CPP-ACP) on the shear bond strength (SBS) of brackets bonded to non-demineralized teeth with either phosphoric acid etching or self-etching primer. Methods: Sixty human premolars were randomly assigned to 1 of 4 treatment groups (n = 15 each): phosphoric acid etching (group 1); self-etching primer (group 2); CPP-ACP for 2 weeks + phosphoric acid etching (group 3), and CPP-ACP for 2 weeks + self-etching primer (group 4). After bonding of the maxillary premolar metal brackets, specimens were subjected to shear forces in a testing machine. Scanning electron microscopy was used to observe etching patterns on the enamel surfaces of all teeth. A 2-way analysis of variance was used to test for effects of CPP-ACP and etching system on SBS. Results: Significantly higher mean SBSs were observed in groups subjected to phosphoric acid etching (i.e., groups 1 and 3; p < 0.05). On the other hand, SBSs did not appear to be influenced by CPP-ACP (i.e., groups 3 and 4; p > 0.05). We observed a uniform and clear etched pattern on the enamel surface of the phosphoric acid etching groups. Conclusions: CPP-ACP does not significantly affect the SBS of orthodontic brackets bonded to non-demineralized teeth, regardless of which adhesive method is used to bond the brackets.
Keywords
CPP-ACP; Shear bond strength; Self-etching primer; Bracket;
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