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Sub ablative E r: YAG laser irradiation on surface roughness of eroded dental enamel
Author(s) -
CurylofoZotti Fabiana Almeida,
Lepri Taísa Penazzo,
Colucci Vivian,
Turssi Cecília Pedroso,
Corona Silmara Aparecida Milori
Publication year - 2015
Publication title -
microscopy research and technique
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.536
H-Index - 118
eISSN - 1097-0029
pISSN - 1059-910X
DOI - 10.1002/jemt.22563
Subject(s) - irradiation , surface roughness , enamel paint , profilometer , laser , er:yag laser , materials science , surface finish , composite material , orange juice , optics , analytical chemistry (journal) , chemistry , chromatography , physics , nuclear physics , food science
ABSTRACT Objective This study evaluated the effects of Er:YAG laser irradiation applied at varying pulse repetition rate on the surface roughness of eroded enamel. Methods Bovine enamel slabs ( n = 10) were embedded in polyester resin, ground, and polished. To erosive challenges, specimens were immersed two times per day in 20mL of concentrated orange juice (pH = 3.84) under agitation, during a two‐day period. Specimens were randomly assigned to irradiation with the Er:YAG laser (focused mode, pulse energy of 60 mJ and energy density of 3.79 J/cm 2 ) operating at 1, 2, 3, or 4 Hz. The control group was left nonirradiated. Surface roughness measurements were recorded post erosion‐like formation and further erosive episodes by a profilometer and observed through atomic force microscopy (AFM). Results Analysis of variance revealed that the control group showed the lowest surface roughness, while laser‐irradiated substrates did not differ from each other following post erosion‐like lesion formation. According to analysis of covariance, at further erosive episodes, the control group demonstrated lower surface roughness ( P > 0.05), than any of the irradiated groups ( P < 0.05). Conclusions The pulse repetition rate of the Er:YAG laser did not affect roughness of dental enamel eroded. The AFM images showed that the specimens irradiated by the Er:YAG laser at 1 Hz presented a less rough surface than those irradiated at 2, 3, and 4 Hz. Microsc. Res. Tech. 78:989–993, 2015 . © 2015 Wiley Periodicals, Inc.