Department of Pediatric Dentistry, Dental School, Shahid Beheshti University of Medical Sciences, Evin, Tehran, Iran.
J Am Dent Assoc. 2010 Feb;141(2):157-61. doi: 10.14219/jada.archive.2010.0133.
The authors conducted an in vitro study to evaluate the shear bond strength of a fissure sealant to enamel pretreated with erbium,chromium:yttrium, scandium,gallium,garnet (Er,Cr:YSGG) laser or air abrasion followed by acid etching.
The authors sectioned extracted sound premolars mesiodistally and used the buccal and lingual surfaces for experimental analysis. They divided specimens randomly into three groups of 15 each according to the enamel surface pretreatment methods: group A, 37 percent phosphoric acid; group B, air abrasion followed by acid etching with 37 percent phosphoric acid; group C, irradiation with Er,Cr:YSGG laser followed by acid etching with 37 percent phosphoric acid. After applying a bonding system, the authors bonded cylinders of sealant to the enamel surfaces by using transparent gelatin tubes (0.7 millimeter in diameter and 1 mm in height) and then polymerized them. They stored all specimens in distilled water at 37 degrees C for 24 hours. They tested shear bond strength by using a universal testing machine with a crosshead speed of 0.5 mm per second. The authors analyzed the data by means of one-way analysis of variance and Tukey-Kramer post hoc tests (alpha = .05).
The bond strength of group B specimens was statistically higher than those of group A and group C specimens (P < .05). The authors found no statistically significant differences in shear bond strength between surfaces treated with Er,Cr:YSGG laser and those treated with acid etching alone (P > .05).
Pretreatment of enamel surfaces with air abrasion increased the bond strength of fissure sealant, but pretreatment with Er,Cr:YSGG laser did not increase the effectiveness of conventional acid etching of enamel in sealant bonds.
作者进行了一项体外研究，以评估经铒铬钇钪镓石榴石（Er,Cr:YSGG）激光预处理或喷砂酸蚀后再酸蚀预处理的牙釉质的裂沟封闭剂的抗剪粘结强度。
作者将从提取的健康前磨牙的近远中面进行切割，并将颊面和舌面用于实验分析。他们将样本根据牙釉质表面预处理方法随机分为三组，每组 15 个：A 组，37%磷酸；B 组，喷砂后用 37%磷酸酸蚀；C 组，Er,Cr:YSGG 激光照射后用 37%磷酸酸蚀。应用粘结系统后，作者使用透明明胶管（直径 0.7 毫米，高 1 毫米）将密封剂的圆柱体粘结到牙釉质表面，然后聚合它们。所有样本均在 37°C 的蒸馏水中储存 24 小时。作者使用万能试验机以 0.5 毫米/秒的十字头速度测试抗剪粘结强度。作者通过单因素方差分析和 Tukey-Kramer 事后检验（α=0.05）对数据进行分析。
B 组样本的粘结强度显著高于 A 组和 C 组样本（P<0.05）。作者发现经 Er,Cr:YSGG 激光处理和单独酸蚀处理的牙釉质表面的抗剪粘结强度之间无统计学差异（P>0.05）。
喷砂预处理牙釉质表面可提高裂沟封闭剂的粘结强度，但 Er,Cr:YSGG 激光预处理不会增加常规酸蚀对封闭剂粘结的有效性。
