Korean J Orthod.  2013 Feb;43(1):23-28. 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

Affiliations
  • 1Department of Orthodontics, College of Dentistry, Yonsei University, Seoul, Korea.
  • 2Research Institute of Dental Biomaterials and Bioengineering, BK21 Project, College of Dentistry, Yonsei University, Seoul, Korea.
  • 3Department of Orthodontics, College of Dentistry and Institute of Craniofacial Deformity, Yonsei University, Seoul, Korea. hwang@yuhs.ac

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.

Keyword

CPP-ACP; Shear bond strength; Self-etching primer; Bracket

MeSH Terms

Adhesives
Bicuspid
Calcium
Calcium Phosphates
Caseins
Dental Enamel
Hand
Humans
Microscopy, Electron, Scanning
Orthodontic Brackets
Phosphoric Acids
Tooth
Adhesives
Calcium
Calcium Phosphates
Caseins
Phosphoric Acids

Figure

  • Figure 1 Shear bond strength test with the Instron machine showing where the debonding force was applied.

  • Figure 2 Scanning electron microscopy images of acid-etched enamel tooth surfaces. A, Surface of a tooth etched with 35% phosphoric acid (×5,000). B, Surface of a tooth etched with Transbond Plus Self-Etching Primer (×5,000).

  • Figure 3 Scanning electron microscopy images of acid-etched enamel surfaces after 2 weeks of pre-treatment with casein phosphopeptide amorphous calcium phosphate. A, Surface of a tooth etched with 35% phosphoric acid (×5,000). B, Surface of a tooth etched with Transbond Plus Self-Etching Primer (×5,000).


Cited by  1 articles

Effects of ultrasonic instrumentation with different scaler-tip angulations on the shear bond strength and bond failure mode of metallic orthodontic brackets
Giulio Alessandri Bonetti, Serena Incerti Parenti, Daniela Rit Ippolito, Maria Rosari Gatto, Checchi Luigi
Korean J Orthod. 2014;44(1):44-49.    doi: 10.4041/kjod.2014.44.1.44.


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