CO2 激光去陶瓷托槽粘接对釉质机械性能的影响。
Effects of CO(2) laser debonding of a ceramic bracket on the mechanical properties of enamel.
机构信息
Department of Oral Growth and Development, Health Sciences University of Hokkaido, Hokkaido, Japan.
出版信息
Angle Orthod. 2010 Nov;80(6):1029-35. doi: 10.2319/041210-204.1.
OBJECTIVE
To investigate the effects of CO(2) laser debonding of a ceramic bracket on the mechanical properties of tooth enamel.
MATERIALS AND METHODS
Fifty-three human premolars were used in this study. The temperature changes of cross-sectioned specimens during laser irradiation were monitored with an infrared thermographic microscope system. Different laser output settings (3, 4, 5, and 6 W) were compared. The shear bond strength of brackets after laser irradiation was measured for specimens bonded with a conventional etch and rinse adhesive or with a self-etching adhesive, and the adhesive remnant index score was calculated. The hardness and elastic modulus of cross-sectioned enamel after laser irradiation were investigated by the nanoindentation test. Data were compared by one-way and two-way analysis of variance, followed by the Scheffé test.
RESULTS
The temperature of enamel increased by about 200 degrees C under CO(2) laser irradiation with a relatively high output (5 and 6 W), and a temperature increase of about 100 degrees C to 150 degrees C was seen under laser irradiation with a low output (3 and 4 W). The bracket shear bond strength decreased under all laser irradiation conditions. The hardness and elastic modulus of enamel were not affected by CO(2) laser debonding.
CONCLUSION
CO(2) laser debonding may not cause iatrogenic damage to enamel.
目的
研究 CO2 激光分离陶瓷托槽对牙釉质力学性能的影响。
材料与方法
本研究使用了 53 个人类前磨牙。用红外热成像显微镜系统监测激光照射过程中横截面标本的温度变化。比较了不同的激光输出设置（3、4、5 和 6 W）。测量了用传统酸蚀-冲洗型黏结剂或自酸蚀黏结剂黏结的标本的激光照射后托槽的剪切粘结强度，并计算了黏结残留指数得分。用纳米压痕试验研究了激光照射后横截面牙釉质的硬度和弹性模量。通过单因素和双因素方差分析，然后是 Scheffé 检验对数据进行比较。
结果
在较高输出（5 和 6 W）的 CO2 激光照射下，牙釉质的温度升高约 200 摄氏度，而在较低输出（3 和 4 W）的激光照射下，温度升高约 100 摄氏度至 150 摄氏度。在所有激光照射条件下，托槽的剪切粘结强度均降低。CO2 激光分离不会影响牙釉质的硬度和弹性模量。
结论
CO2 激光分离不会对牙釉质造成医源性损伤。
Zotero 插件