Evaluación de la fuerza adhesiva de brackets con bases de diferentes diseños

Abstract

Introduction: the base bracket design can determine the shear bond strength. According to the manufacturer, micro-columns bracket base improves it shear bond strength. Material and Method: 50 bovine incisors were used in two groups according to the bracket to be bonded. Group 1: Flexx-2G brackets (Pacific-Orthodontics, Teruel-Spain). The base of these brackets has traditional mesh structure. Group 2: Scape-3G-Stylus brackets (Pacific-Orthodontics). The manufacturer describes this base as micro-columns. Both groups were bonded by using Transbond-Plus Self-Etching Primer (3MUnitek Dental-Products, Monrovia-USA) and Transbond-XT (3MUnitek Dental-Products, Monrovia-USA). The shear bond strength was measured by means of a universal test machine (Autograph-AGS-1KND, Shimadzu-Japan), with a speed of 1mm/min. The remnant adhesive after debonding was quantified with an image analysis equipment and MIP4.5 software (Microm-Image-Processing Software, Digital Image Systems, Barcelona-Spain). Shear bond strength values were analyzed through a T-test for two independent samples (p<0.05) and adhesive percentage values on tooth were in turn analyzed with a Mann-Whitney test for two independent samples (p<0.05). Results: shear bond strength of brackets with micro-columns was significantly higher (p=0.01) than traditional base. Brackets with micro-columns left significantly less adhesive on tooth (p=0.00) than traditional base brackets. Conclusion: the micro-columns base means an alternative to mesh, since them had a significantly higher bond strength and left significantly less adhesive on tooth after debonding.