The effects of different desensitizer agents on shear bond strength of orthodontic brackets after home bleaching: an in vitro study

Year 2018, Volume: 52 Issue: 2, 69 - 74, 01.05.2018

Nisa Gül Amuk , Aslı Baysal Yakup Üstün Gökmen Kurt

Abstract

DOI: 10.26650/eor.2018.576

Purpose

The aim of this study was to test the null
hypothesis that no difference exists between shear bond strength values of
control and bleaching plus desensitizer applied groups.

Materials and methods

A hundred freshly extracted human premolar
teeth were randomly divided into five groups. Group I served as the control
group with no bleaching application, while only bleaching was achieved in Group
II. Desensitizer containing potassium nitrate–fluoride and casein
phosphopeptide amorphous calcium phosphate were applied in Groups III and IV, after
bleaching respectively. A bleaching agent containing amorphous calcium
phosphate was used in Group V. Shear bond strength tests were carried out using
a universal testing machine (Instron Corp., Norwood, MA, USA). Remnant adhesive
on the teeth and brackets was examined to score the adhesive remnant index.
Kruskal-Wallis and Chi-Square tests were used for statistical analysis of the
data.

Results

Statistically significant differences were
found among the groups for shear bond strength values (p<.001). The shear
bond strength of Group III (8.0±2.2 MPa) was significantly lower than the other
groups (p<.05). The highest shear bond strength values were found for Group
I (13.6±3.7 MPa) and Group IV (12.8±4.0 MPa). No statistically significant
difference was observed between Group II (10.0±2.7 MPa) and Group V (10.8±2.9
MPa). The differences between adhesive remnant index scores of the groups were
not statistically significant.

Conclusion

Casein phosphopeptide amorphous calcium
phosphate gel application showed a similar shear bond strength value to the
control group, while shear bond strength values decreased after using other
desensitizers.

Keywords

Orthodontic bonding; tooth bleaching; dentin desensitizing agents; casein phosphopeptide amorphous calcium phosphate; shear bond strength

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