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The most common method for the removal of all-ceramic restorations is to use a highspeed handpiece with a stone or bur. Unfortunately, this process can be difficult, time-consuming and may lead to the loss of healthy tooth structures. Lasers have been suggested and used to remove ceramic orthodontic brackets, laminate veneers and full anatomical crowns. Aim: Aim of the present study was to evaluate the debonding effect of erbium, chromium-doped yttrium, scandium, gallium and garnet (ErCr:YSGG) on Computer-aided design and computer-aided manufacturing (CAD/CAM) end crown restorations. Materials and methods: Overall, 30 molar samples were prepared for this study and divided into two groups as follows: Group A–(n = 15): Endocrowns subjected to ErCr:YSGG laser application. Group B–(n = 15): Endocrowns not subjected to the laser (control). Endocrowns were fabricated from lithium disilicate ceramics and manufactured using a CAD/CAM machine. Cementation was done using Bisco Duo Link UniversalTM resin cement. ErCr:YSGG laser was used with wavelength 2780 nm, 0.3J energy, 10 Hz frequency and 1000 μm tip size. Pull out test was done using a universal testing machine. Results: It was found that Non-laser group recorded statistically significant (p < 0.05) higher mean value (258.14 ± 63.43 N) for debonding than Laser group mean value (156.66 ± 32.89 N) as indicated by student t-test. Additionally, no carbonization at the dentin/cement interface was observed. Conclusion: According to the results of this study, ErCr: YSGG application can be considered a conservative method for the debonding of all ceramic endocrowns. Clinical significance: Some practitioners have been against the use of endocrown restorations due to the difficulty faced in removal and retrieval, the use of laser is an alternative, effective and conservative method.

world journal of dentistry

Effect of Erbium, Chromium-doped Yttrium, Scandium, Gallium, and Garnet 2.7 nm Laser on Debonding of Computer-aided Design and Computer-aided Manufacturing Endocrowns