Premium
American Society for Laser Medicine and Surgery Abstracts
Author(s) -
Marcia Moraes,
Ana Aranha,
Denise Zezell,
Anderson Freitas,
Reza Fekrazad,
Omid Mortezai,
Mir Sepehr Pedram,
Katayoun A. M Kalhori,
Mashadi Abbas Fatemeh,
Gerry Ross,
Vadood Ghasemi Barghi,
Arash Poorsattar Bejeh Mir,
Masoumeh Shams Ghafarrokhi
Publication year - 2011
Publication title -
lasers in surgery and medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 112
eISSN - 1096-9101
pISSN - 0196-8092
DOI - 10.1002/lsm.21034
Subject(s) - citation , laser , medicine , laser surgery , library science , computer science , optics , physics
Anderson Freitas IPEN CNEN/SP, University of São Paulo, São Paulo, Brazil Background: This in vitro study aimed to evaluate changes in optical attenuation coefficient of eroded dentine analysed by Optical Coherence Tomography (OCT) after irradiation with Nd: YAG laser and topical fluoride. Study: The samples were protected with acid resistant varnish, with the exception of the central area of 2mm diameter and divided into 8 groups (n1⁄415) and subjected to acidic cycling with citric acid solution for 20 minutes, twice a day, during 20 days. After 10 day submitted to acid challenges, each group received different treatment: control group (no treatment), fluoride group (topical sodium fluoride 2% -by 4 minutes); three laser groups irradiated with Nd:YAG irradiating on contact (1W, 0.7W and 0.5W mean power); and three treated groups associating the fluoride to laser irradiation. The OCT readings were performed at days: 1 prior to first acid challenge (OCT1); at day 5 (OCT2); at day 10 (OCT3); at day 15 (OCT4); at day 17 (OCT5) and at day 20 (OCT6). It was developed a homemade software to retrieve the total optical attenuation coefficient. Results: It was observed an increase of optical attenuation coefficient among the control group and the others groups. The best result for erosion treatment was the combination of fluoride followed by laser irradiation with radiant exposure of 39.78 J/cm. Conclusion: The optical attenuation coefficient determined by OCT proved to be an important quantitative diagnostic tool.