Evaluación in vitro de la resistencia a la tracción de brackets ortodónticos despues del grabado del esmalte con ácido fosfórico, con láser ER,CR:YSGG y la combinación de láser ER,CR:YSGG más ácido fosfórico.

摘要

The aim of this study was to measure the tensile bond strength of orthodontic brackets after enamel etching with, 1) 37% phosphoric acid, 2) Er,Cr:YSGG laser and, 3) a combination of both methods, to determine which enamel etching protocol offers the best results and also examine the enamel etch pattern under the SEM. 30 human bicuspids extracted for orthodontics reasons were divided into 3 groups: Group 1 (37% phosphoric acid etching), Group 2 (Er,Cr: YSGG Laser etching) and Group 3 (a combination of both etching methods). There was no statistically significant difference between the 3 groups (Group 3>Group 2, Group 2>Group 1). SEM observation revealed that Group 1 had a type 3 etch pattern. Group 2 and 3 had mostly a type 1 etch pattern. As a conclusion, it was determined that Laser generates bigger shear bond strength than 37 % phosphoric acid and the biggest results were achieved with the combination of both methods. Laser can be used as an enamel etching method in orthodontics.