Evaluation of Different Enamel Surface Treatment on the Bracket Bonding

Volume 4 , Issue 1 , December 2017 , Pages 43-51

Authors

Bayan A. Hassan 1 ; Mansour H. Mohammed 1

1 Orthodontic department, College of Dentistry, Hawler Medical University, Erbil, Iraq

DOI logo 10.17656/sdj.10070

Keywords

Abstract

Objective: To evaluate and compare the effects of different enamel conditioning techniques on the shear bond strength of brackets,
the failure sites following debonding and the surface morphology of the enamel.
Methods: In this study, 72 human premolars were randomly divided into six groups of 12 specimens each. The enamel surfaces of
the teeth were etched with 37% phosphoric acid in group PA, deproteinized using sodium hypochlorite and 37% phosphoric acid
in group NaOCl + PA, sandblasted and etched with 37% phosphoric acid in group AA + PA, conditioned by self-etching primer in
group TPSEP, deproteinized using sodium hypochlorite and conditioned by self-etching primer in group NaOCl +TPSEP,
sandblasted and conditioned by self-etching primer in group AA + TPSEP. After enamel conditioning procedures, brackets were
bonded to the treated enamel surface, and shear bonding test was performed. After deboning, ARI scores were calculated for all
groups. Two samples from each group before bonding procedure were inspected by SEM for study the surface topography of
enamel following different conditioning techniques. Data were subjected to analysis of One-way variance, Scheff post hoc, Chisquare and Spearman’s tests.
Results: The mean bond strength values for groups NaOCl and PA have a higher mean shear bond strength among other groups
while self-etching primer in group TPSEP had a lower shear bond strength. A significant difference was observed in the bond
strengths between groups (p < 0.001). However, insignificant difference found in ARI in all groups (P = 0.118). SEM observation
revealed different etching patterns on the enamel surface after pretreatment.
Conclusions: Enamel surface pretreatments, using a combination of sodium hypochlorite or sandblasting before phosphoric acid
and self-etching primer, result in increased shear bond strength of orthodontic brackets as well as the surface roughness of enamel.

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  • Published at1 December 2017

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