Effects of Zingiber Offcianille on shear bond strength of orthodontic bracket adhered into re-bonded tooth surface

Abstract

BACKGROUND: One of the most practical, basic and commonly used tests for evaluating the adhesion resistance of bonded orthodontic brackets is shear bond strength. The ideal shear bond strength of the bracket to enamel is anticipated to resist bracket failure during the orthodontic treatment, while not causing enamel damage during de-bonding and maintaining the enamel integrity after finishing treatment.

AIMS: The aim of this study was to evaluate the shear bond strength of the brackets adhered into bonded and re-bonded teeth surfaces of fluorescent orthodontic adhesive modified by incorporation of Zingiber officinale essential oil.

MATERIALS AND METHODS: Sixty recently extracted human lower first premolars caries-free teeth were used in this study. The teeth were randomly divided into 6 groups. The bonding control, bonding with a fluorescent orthodontic adhesive modified with 1%, 2% Zingiber officinale essential oil, control after re-bonding, and re-bonding with a fluorescent orthodontic adhesive modified with 1%, 2% Zingiber officinale essential oil. In the re-bonding three groups, they were de-bonded by the bracket removing plier (base method) and the remaining adhesive was removed. Then anew bracket was re-bonded in the same protocol. The shear bond strength was measured in Mega Pascal at cross head speed 1 mm/min. Then, adhesive remnant index was evaluated by a stereomicroscope 10X. Statistical analysis was with p value at p<0.05.

RESULTS: The shear bond strength of the control bonding group was significantly higher than the modified bonding groups with 2% Zingiber officinale essential oil. Whereas, the control after re-bonding group was higher than the modified re-bonding groups with no statistical significant difference. The distribution of the adhesive remnants index scores was significantly different among the study groups.

CONCLUSION: Generally, Zingiber officinale essential oil addition into fluorescent orthodontic adhesive reduced the shear bond strength in the bonded and re-bonded groups, particularly in the bonding modified with 2% concentration.