Anaraki Saeid Nemati, Serajzadeh Maryam, Fekrazad Reza
Operative Department, School of Dentistry, Tehran branch, Islamic Azad University, Tehran, Iran.
Pediatr Dent. 2012 Jul-Aug;34(4):e92-6.
The purpose of this in vitro study was to evaluate the irradiation efficacy of the CO(2) laser and the Er, Cr:YSGG laser-either unassisted or assisted by acidulated phosphate fluoride (APF) treatment-on enamel's acid resistance.
One hundred twenty enamel samples, obtained from 20 extracted human molars, were randomly assigned to 6 groups as follows: (1) control (C); (2) exposed to acidulated phosphate fluoride (APF) gel (F); (3) Er, Cr:YSGG laser (EL); (4) irradiated with Er, Cr:YSGG laser through APF gel (EL/F); (5) CO(2) laser (CL); and (6) irradiated with CO(2) laser through APF gel (CL/F). The specimens were individually demineralized in an acidified hydroxyethylcellulose system, and the acid resistance was evaluated by determining the calcium ion using atomic absorption spectrometry.
The average concentration of the calcium ion determined in groups C, F, EL, EL/F, CL, and CL/F was, respectively, 3.36, 2.63, 2.26, 2.32, 2.24, and 1.51 ppm. The results showed that demineralization in the: CL/F group was significantly less than the other groups; and the control group was significantly more than the other groups (P<.001).
The effect of CO(2) laser irradiation, used with acidulated phosphate fluoride, in decreasing the enamel demineralization was more than all the other groups.
本体外研究的目的是评估二氧化碳激光和铒铬：钇钪镓石榴石激光（未辅助或经酸化磷酸氟化物（APF）处理辅助）对牙釉质耐酸性的照射效果。
从20颗拔除的人类磨牙中获取120个牙釉质样本，随机分为6组，如下：（1）对照组（C）；（2）暴露于酸化磷酸氟化物（APF）凝胶（F）；（3）铒铬：钇钪镓石榴石激光（EL）；（4）通过APF凝胶用铒铬：钇钪镓石榴石激光照射（EL/F）；（5）二氧化碳激光（CL）；以及（6）通过APF凝胶用二氧化碳激光照射（CL/F）。将标本分别在酸化羟乙基纤维素系统中脱矿，并通过原子吸收光谱法测定钙离子来评估耐酸性。
在C组、F组、EL组、EL/F组、CL组和CL/F组中测定的钙离子平均浓度分别为3.36、2.63、2.26、2.32、2.24和1.51 ppm。结果表明：CL/F组的脱矿明显少于其他组；对照组的脱矿明显多于其他组（P<0.001）。
与酸化磷酸氟化物联合使用的二氧化碳激光照射在降低牙釉质脱矿方面的效果优于所有其他组。
