Abstract
Background
The aim of this study was to evaluate the effects of repeated bonding using a conventional
primer (CP) or a self-etching primer (SEP) on the in vitro shear bond strength (SBS)
and adhesive remnant index (ARI) of orthodontic brackets.
Methods
A total of 144 human premolars were divided into two equal-sized groups and bonded
with metal brackets using a CP in one group and an SEP in the other group. The SBS
and ARI were determined after bracket debonding using a universal testing machine.
Each group of premolars was then further divided into two equal-sized subgroups, which
were bonded with new brackets using a CP in one subgroup and an SEP in the other subgroup.
Again, the SBS and ARI were determined. Differences in SBS and ARI between the groups
and among the subgroups were tested for statistical significance.
Results
During the first debonding sequence, the mean SBS values were 10.60 and 10.13 MPa
in the CP and SEP groups, respectively. During the second debonding sequence, the
mean SBS values ranged from 10.37 to 11.39 MPa. Most or all adhesive remained on the
tooth after bracket debonding. There were no statistically significant differences
in SBS or ARI between the first and second debonding sequences, between the groups,
or among the subgroups.
Conclusion
With regard to SBS and ARI, SEPs perform as well as CPs for repeated bracket bonding.
Keywords
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Article info
Publication history
Published online: June 20, 2014
Accepted:
May 5,
2014
Received:
February 24,
2014
Identification
Copyright
© 2014 World Federation of Orthodontists. Published by Elsevier Inc. All rights reserved.
