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Proceedings Paper

Er:YAG laser debonding of porcelain veneers
Author(s): Natalie Buu; Cynthia Morford; Frederick Finzen; Arun Sharma; Peter Rechmann
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Paper Abstract

The removal of porcelain veneers using Er:YAG lasers has not been previously described in the scientific literature. This study was designed to systematically investigate the efficacy of an Er:YAG laser on veneer debonding without damaging the underlying tooth structure, as well as preserving a new or misplaced veneer. Initially, Fourier Transform Infrared Spectroscopy (FTIR) was used on flat porcelain veneer samples (IPS Empress Esthetic; Ivoclar Vivadent, Amherst, NY) to assess which infrared laser wavelengths are transmitted through the veneer. Additionally, FTIR spectra from a veneer bonding cement (RelyX Veneer Cement A1; 3M ESPE, St. Paul, MN) were obtained. While the veneer material showed no characteristic water absorption bands in the FTIR, the bonding cement has a broad H2O/OH absorption band coinciding with the ER:YAG laser emission wavelength. Consequently Er:YAG laser energy transmission through different veneer thicknesses was measured. The porcelain veneers transmitted 11 - 18 % of the incident Er:YAG laser energy depending on their thicknesses (Er:YAG laser: LiteTouch by Syneron; wavelength 2,940 nm, 10 Hz repetition rate, pulse duration 100 μs at 133 mJ/pulse; straight sapphire tip 1,100 μm diameter; Syneron, Yokneam, Israel). Initial signs of cement ablation occurred at approximately 1.8 - 4.0 J/cm2. This can be achieved by irradiating through the veneer with the fiber tip positioned at a distance of 3-6 mm from the veneer surface, and operating the Er:YAG laser with 133 mJ output energy. All eleven veneers bonded on extracted anterior incisor teeth were easily removed using the Er:YAG laser. The removal occurred without damaging underlying tooth structure as verified by light microscopic investigation (Incident Light Microscope Olympus B 50, Micropublisher RTV 3.3 MP, Image Pro software, Olympus). The debonding mainly occurred at the cement/veneer interface. When the samples were stored in saline solution for 5 days and/or an air-waterspray was used during irradiation, there was a high chance that the veneer would fractured during debonding. However if samples were not stored in water and only air spray was used, 75% of the veneers could be removed without any fracture. The use of an Er:YAG laser can be effective in not only debonding porcelain veneers and preserving tooth structure, but also in maintaining veneer integrity.

Paper Details

Date Published: 5 March 2010
PDF: 8 pages
Proc. SPIE 7549, Lasers in Dentistry XVI, 754909 (5 March 2010); doi: 10.1117/12.849337
Show Author Affiliations
Natalie Buu, School of Dentistry, Univ. of California, San Francisco (United States)
Cynthia Morford, School of Dentistry, Univ. of California, San Francisco (United States)
Frederick Finzen, School of Dentistry, Univ. of California, San Francisco (United States)
Arun Sharma, School of Dentistry, Univ. of California, San Francisco (United States)
Peter Rechmann, School of Dentistry, Univ. of California, San Francisco (United States)

Published in SPIE Proceedings Vol. 7549:
Lasers in Dentistry XVI
Peter Rechmann D.D.S.; Daniel Fried, Editor(s)

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