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:: Volume 32, Issue 1 And 2 (1-2020) ::
J Islam Dent Assoc Iran 2020, 32(1 And 2): 21-29 Back to browse issues page
Effect of Er:YAG Laser Irradiation on Shear Bond Strength of Two Porcelain Laminate Veneers Bonded to Tooth Surface
Ehsan Morshedi1 , Maryam Azimi Zavaree2, Seyed Mohammad Reza Hakimaneh2 , Sayed Shojaedin Shayegh3 , Maryam Pirmoradian4, Sara Torabi5, Sina Jafari * 6
1- Postgraduate Student, Faculty of Dentistry, Shahed University, Tehran, Iran
2- Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Shahed University, Tehran, Iran
3- Associate Professor, Department of Prosthodontics, Faculty of Dentistry, Shahed University, Tehran, Iran
4- PhD. Candidate, Department of Dental Biomaterials, School of Dentistry, Research Center for Science and Technology in Medicine, Tehran University of Medical Sciences, Tehran, Iran
5- Periodontist, Tehran, Iran
6- Postgraduate Student, Faculty of Dentistry, Shahed University, Tehran, Iran , sina_jafari89@yahoo.com
Abstract:   (453 Views)
Background and Aim: The conventional procedure for removal of porcelain laminate veneers (PLVs) is time-consuming and inconvenient. The purpose of this study was to evaluate the efficacy of Er:YAG laser for debonding of PLVs.
Materials and Methods: Forty-eight intact extracted human maxillary anterior teeth received discoid PLVs (24 feldspathic and 24 e-max ceramic). The PLVs had 0.7 mm thickness and 4 mm diameter. After cementation of all PLVs with a light-cure cement, samples were stored at 37ºC distilled water for 48 h. Samples of each ceramic were randomly divided into 3 groups of 8 samples. Then, laser was irra-diated on the cemented PLVs as follows: (I) feldspathic PLVs without laser irradiation (control group), (II) feldspathic PLVs with laser irradiation (6 s, 10 Hz, 200 mJ, 2 W), (III) feldspathic PLVs with laser irradiation (6 s, 10 Hz, 300 mJ, 3 W), (IV) e-max PLVs without laser irradiation (control group), (V) e-max PLVs with laser radiation (6 s, 10 Hz, 200 mJ, 2 W), (VI) e-max PLVs with laser irradiation (6 s, 10 Hz, 300 mJ, 3 W). The shear bond strength of all samples was measured using a universal testing machine. We used Mann-Whitney and Kruskal-Wallis tests for data analysis (P<0.05).
Results: Laser irradiation decreased the shear bond strength of both ceramics. But this decrease was only significant for the e-max group (P<0.05). No significant difference was found between different laser irradiation powers in the two ceramic groups.
Conclusion: Er: YAG laser is effective for debonding of e-max PLVs.
Keywords: Dental Porcelain, Dental Veneers, Lasers, Solid-State, Resin Cements
Full-Text [PDF 758 kb]   (143 Downloads)    
Type of Study: Orginal | Subject: Porosthodontics
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Morshedi E, Azimi Zavaree M, Hakimaneh S M R, Shayegh S S, Pirmoradian M, Torabi S et al . Effect of Er:YAG Laser Irradiation on Shear Bond Strength of Two Porcelain Laminate Veneers Bonded to Tooth Surface. J Islam Dent Assoc Iran. 2020; 32 (1 and 2) :21-29
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Volume 32, Issue 1 And 2 (1-2020) Back to browse issues page
Journal of Islamic Dental Association of Iran

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