Effect of Er:YAG laser on enamel acid resistance:: Morphological and atomic spectrometry analysis

被引:63
|
作者
Cecchini, RCM
Zezell, DM
de Oliveira, E
de Freitas, PM
Eduardo, CD
机构
[1] Univ Sao Paulo, Sch Dent, Dept Restorat Dent, BR-05508900 Sao Paulo, Brazil
[2] IPEN CNEN SP, BR-05508900 Sao Paulo, Brazil
[3] Univ Sao Paulo, Inst Chem, Dept Fundamental Chem, BR-05508900 Sao Paulo, Brazil
关键词
atomic emission spectrometry; caries; demineralization; enamel; Erbium laser;
D O I
10.1002/lsm.20247
中图分类号
R75 [皮肤病学与性病学];
学科分类号
100206 ;
摘要
Background and Objectives: This study evaluated the effect of Er:YAG laser on enamel acid resistance. Study Design/Materials and Methods: Seventy human enamel slabs were randomly divided into seven groups (n = 10): G1, Er:YAG laser (Key Laser 2, KaVo, Germany) 60 mJ, 2 Hz, 33.3 J/cm(2) (handpiece no. 2051, non-contact); G2, Er:YAG laser 80 mJ, 2 Hz, 44.4 J/cm(2) (handpiece no. 2051, non-contact); G3, Er:YAG laser 120 mJ, 2 Hz, 66.6 J/cm(2) (handpiece no. 2051, non-contact); G4, Er:YAG laser 64 mJ, 2 Hz, 20 J/cm(2) (handpiece no. 2055, contact); G5, Er:YAG laser 86.4 mJ, 2 Hz, 26.9 J/cm2 (handpiece no. 2055, contact); G6, Er:YAG laser 135 mJ, 2 Hz, 42.2 J/cm(2) (handpiece no. 2055, contact); G7, control. After laser irradiation, samples were submitted to an acid challenge. For both the nos. 2051 and 2055 handpieces, irradiation was performed with a water cooled spray (5.0 ml/minutes). The calcium and phosphorous ions delivered from the tooth surface were quantified by atomic emission spectrometry, and morphological analysis of the enamel surface was performed under scanning electron microscopy. Kruskal-Wallis and multiple comparisons tests were applied to distinguish significant differences among the treatments (alpha = 5%). Results: Groups G1, G2, and G4 presented decreased demineralization. The SEM evaluation revealed different surface alterations as a result of the different energies used. Conclusion: Lower energies can decrease enamel solubility without severe alterations of the enamel.
引用
收藏
页码:366 / 372
页数:7
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