World Journal of Dentistry

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VOLUME 9 , ISSUE 5 ( September-October, 2018 ) > List of Articles


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

Ahmed EL Hawary, Ahmed Abbas, Tarek Harhash

Keywords : All ceramic restoration, CAD/CAM, Debonding, Endocrown, Effect of erbium, Chromium-doped yttrium, Scandium, Gallium and garnet 2.7 nm Laser on Debonding of CAD/CAM Endocrowns

Citation Information : EL Hawary A, Abbas A, Harhash T. 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. World J Dent 2018; 9 (5):349-354.

DOI: 10.5005/jp-journals-10015-1561

License: CC BY-NC 4.0

Published Online: 01-10-2018

Copyright Statement:  Copyright © 2018; The Author(s).


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 Universal 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.

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