Evaluation of the bond strength and debonding pattern of different bracket bonding systems associated with chlorhexidine

Jorge Luís de Oliveira RIBEIRO, Rebeca Barroso BEZERRA, Elisângela de Jesus CAMPOS, Aline Andrade de FREITAS

Aim: The objective of this in vitro study was to evaluate the bond strength and the debonding pattern of different bracket bonding systems (Transbond XT System / 3M-Unitek and Enlight System / Ormco) whose respective adhesives were pre-mixed with chlorhexidine varnish (Cervitec / Ivoclar-Vivadent). Methods: The sample used consisted of sixty human pre-molars extracted for orthodontic purposes, included in PVC cylinder and randomly divided in four experimental groups: group 1 – Transbond XT System according to the manufacturer’s instructions; group 2 - Transbond XT System combined with chlorhexidine varnish; group 3 – Enlight System according to the manufacturer’s instructions; group 4 – Enlight System combined with chlorhexidine varnish. The bond strength evaluation was obtained through the shear bond strength test by EMIC universal test machine (0.5mm/minute); the debonding pattern evaluation was obtained by STEMI 2000-C/Zeiss (20x) stereoscopic microscope through observation of the adhesive remnant index (ARI) on the tooth’s enamel surface after bracket debonding. Results: Between the experimental groups (groups 2 and 4) and the respective control groups (groups 1 and 3) there was no significant statistical difference (p < 0.05). Conclusions: The bond strength and the debonding pattern were not altered for association of the chlorhexidine varnish with respective adhesives of the tested bonding systems.

Keywords: Orthodontic brackets. Shear bond strength. Chlorhexidine.

Wednesday, May 01, 2024 21:04