Ahrari Farzaneh, Poosti Maryam, Motahari Pourya
Dental Research Center, Islamic Azad University, Tehran, Iran.
Dent Res J (Isfahan). 2012 Jul;9(4):472-7.
Several studies have shown that laser-etching of enamel for bonding orthodontic brackets could be an appropriate alternative for acid conditioning, since a potential advantage of laser could or might be caries prevention. This study compared enamel resistance to demineralization following etching with acid phosphoric or Er:YAG laser for bonding orthodontic brackets.
Fifty sound human premolars were divided into two equal groups. In the first group, enamel was etched with 37% phosphoric acid for 15 seconds. In the second group, Er:YAG laser (wavelength, 2 940 nm; 300 mJ/pulse, 10 pulses per second, 10 seconds) was used for tooth conditioning. The teeth were subjected to 4-day PH-cycling process to induce caries-like lesions. The teeth were then sectioned and the surface area of the lesion was calculated in each microphotographs and expressed in pixel. The total surface of each specimen was 196 608 pixels.
Mean lesion areas were 7 171 and 7532 pixels for Laser-etched and Acid-etched groups, respectively. The two sample t-test showed that there was no significant difference in lesion area between the two groups (P = 0.914).
Although Er:YAG laser seems promising for etching enamel before bonding orthodontic brackets, it does not reduce enamel demineralization when exposed to acid challenge.
多项研究表明，对牙釉质进行激光蚀刻以粘结正畸托槽可能是酸蚀处理的一种合适替代方法，因为激光的一个潜在优势可能是预防龋齿。本研究比较了用磷酸或铒钇铝石榴石（Er:YAG）激光蚀刻后粘结正畸托槽时牙釉质的抗脱矿能力。
将50颗健康人前磨牙分成两组，每组数量相等。第一组用37%的磷酸对牙釉质蚀刻15秒。第二组使用Er:YAG激光（波长2940nm；300mJ/脉冲，每秒10个脉冲，共10秒）对牙齿进行处理。让牙齿经历4天的pH循环过程以诱导类似龋齿的病变。然后将牙齿切片，在每张显微照片中计算病变的表面积，并以像素表示。每个样本的总表面积为196608像素。
激光蚀刻组和酸蚀刻组的平均病变面积分别为7171像素和7532像素。两样本t检验显示两组之间的病变面积无显著差异（P = 0.914）。
虽然Er:YAG激光在粘结正畸托槽前蚀刻牙釉质方面似乎很有前景，但在受到酸侵蚀时，它并不能降低牙釉质的脱矿程度。
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