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Erschienen in:
22.05.2021 | Original Article
Efficiency of Er:YAG laser versus Er;Cr:YSGG laser in debonding of different glass ceramic veneers: an in vitro study
Erschienen in: Lasers in Dental Science | Ausgabe 3/2021
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Objectives
In some circumstances when laminate veneers need to be removed, conventional methods of removal using air-driven handpiece are time-consuming and might pose as a biological hazard to adjacent teeth. To overcome these difficulties, the use of lasers were recently introduced as a more comfortable and conservative restoration removal technique. The aim of this study was to evaluate the debonding efficiency of two types of lasers when applied to a bonded lithium disilicate and leucite-based veneers of different thicknesses.
Materials and methods
A total of 84 sound premolars were divided into three groups. Group A received laser wavelength of 2940 nm (Er:YAG), group B received laser wavelength of 2870 nm (Er;Cr:YSGG), and group C received no laser application. Specimens were sectioned in two different thicknesses (0.3 and 0.7 mm) and bonded to prepared buccal surfaces. Laser was applied immediately after bonding, and debonding time was calculated. Surviving specimens that did not debond after 15s of laser application were tested for shear bond strength to compare difference in shear bond strength from the control group.
Results
Our study showed that the Er;Cr:YSGG 2780-nm laser generally took longer time in debonding than the Er:YAG laser. Lithium disilicate ceramic of 0.3-mm and 0.7-mm thicknesses showed statistically significantly lower median debonding time than leucite-based ceramic.
Conclusion
The Er;Cr:YSGG and Er:YAG are effective in glass ceramic debonding. Ceramic thickness affected debonding time. Lithium disilicate took shorter debonding time than leucite-based specimens. Surviving specimens showed drastic decrease in shear bond strength compared to control group.