Comparison of surface roughness of enamel and shear bond strength, between conventional acid etching and erbium, chromium‑doped: Yttrium scandium‑gallium‑garnet laser etching – An in vitro study

S. Dilip, S. Srinivas, M. N. Mohammed Noufal, R. Krishnaraj, Anila Charles


Background: The purpose of the study was to evaluate and to compare the shear bond
strength (SBS), adhesive remnant index, and surface roughness of the samples bonded after etching
with phosphoric acid and erbium, chromium‑doped: Yttrium scandium‑gallium‑garnet (Er, Cr: YSGG)
Materials and Methods: In the present analytical/descriptive study, 90 premolars extracted for
orthodontic purposes were used, out of which 75 were randomly divided into five groups where
five different methods were used to prepare the enamel for bonding; etching with 37% phosphoric
acid for 15 s, irradiation with Er, Cr: YSGG laser at 1 watt for 10 s and 20 s, and irradiation with
Er, Cr: YSGG laser at 1.5 watt for 10 s and 20 s. Following this, metal brackets were bonded
with Transbond XT. Brackets were debonded 24 h, later and SBS were measured, and adhesive
remnant index scores were measured. The remaining 15 teeth were used for surface evaluation of
these five groups using three‑dimensional optical profiler. The results of the SBS testing, adhesive
remnant index) scores, and surface roughness values were analyzed by one‑way analysis of variance
and Tukey honestly significant difference tests with a significant level at 0.05.
Results: The difference in bond strength between the laser (1.5 W/20 s) and conventional acid
etching was not statistically significant (P > 0.05). For acid etch tech, it was 10.48 Mpa and Laser
etch at 1.5 W/20 s 10.46 Mpa bond strength attained by the other groups (1 W/10 Hz, 1 W/20 Hz,
and 1.5 W/10 Hz) was significantly less than acid etched, and laser etched (1.5 W/20 Hz) groups
with P > 0.05. The surface roughness was found to be similar between the laser‑ (1.5 W/20 s) and
acid‑etched groups (P > 0.05).
Conclusion: Irradiation with 1.5 W/20 s Er, Cr: YSGG laser produced bond strength comparable
to acid etching.
Key Words: Bond strength, etching, laser

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