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The aim of the study was to evaluate the influence of different power outputs and times on the shear bond strength (SBS), surface texture and mode failure of brackets bonded to enamel etched with erbium (Er,Cr:YSGG) or acid. The study used 205 human premolar teeth extracted for orthodontic purposes. Twenty-five teeth were not subjected to shear testing but were prepared for scanning electron microscopy. The data was analyzed by Mann–Whitney U-test. Adhesive Remnant Index scores were also taken into account, and P &lt; 0.05 was deemed significant for all tests. The SBS obtained from 1 W laser irradiation was remarkably lower than those obtained from other laser groups, and 1.5, 2 and 2.5 W laser irradiations could etch enamel. The Er,Cr:YSGG laser can be used as a substitute for acid etching to obtain the required bond strength and is safe to use on enamel surface in a short period of time (5 or 10 s). However, it has deleterious effects when used in prolonged time and increased power sitting.

clinical and investigative orthodontics

Influence of different power outputs and times on shear bond strength and scanning electron microscopy evaluation of bonded brackets using ER,CR:YSGG laser