Publication:

Shear bond strength of orthodontic brackets bonded with four different orthodontic adhesives: an in vitro study

Background The fundamental requirement of an orthodontic adhesive is clinically acceptable bond strength between orthodontic brackets and tooth surface without any failure. Bond strength has a massive influence in the success of orthodontic treatment. The study aimed to evaluate and compare the shear bond strength of four different orthodontic adhesives.

Methods This in-vitro study was conducted at the Department of Orthodontics and Dentofacial Orthopaedics, Dhaka Dental College & Hospital. Eighty extracted human premolars of 30 participants were randomly divided into four groups and bonded with 0.018-inch stainless steel edgewise brackets: Group 1-37% phosphoric acid + Enlight; Group 2-37% phosphoric acid + Transbond XT; Group 3 - Xeno V+ self-etch adhesive; Group 4 - ESPE universal self-etch primer + Transbond Plus color change adhesive.

Results Transbond XT exhibited the highest shear bond strength (14.45 MPa), followed by Enlight (7.80 MPa), Xeno V+ (6.73 MPa), and Transbond Plus (4.25 MPa). ANOVA revealed a significant difference among the groups, and post hoc Bonferroni tests confirmed significant pairwise differences. Regarding adhesive remnant index (ARI) scores, score 0 was most frequent in the Transbond Plus group (35%), score 1 in Transbond XT (60%), score 2 in Xeno V+ (55%), and score 3 in Enlight (35%). Chi-square analysis showed a significant difference (p<0.001) in ARI distribution among groups.

Conclusions This study showed that clinically acceptable bond strength was observed for Transbond XT, Enlight, and Xeno V+, with Transbond XT exhibiting the highest shear bond strength, followed by Enlight, Xeno V+, and Transbond Plus.