Miresmaeili Amirfarhang, Etrati Khosroshahi Mohammad, Motahary Pouya, Rezaei-Soufi Loghman, Mahjub Hossein, Dadashi Maryam, Farhadian Nasrin
Associated professor, Orthodontic dept., Dental faculty, Hamadan university of medical sciences, Hamadan, Iran.
Department of Medical Engineering, Amirkabir University, Tehran, Iran.
J Dent (Tehran). 2014 Jul;11(4):411-7. Epub 2014 Jul 31.
This study was designed to evaluate the effect of argon laser irradiation on development and progress of enamel demineralization around orthodontic brackets.
Fifty caries-free, intact human premolars were randomly assigned to one of the following five equal groups: Groups 1 (control) and 2: The brackets were bonded using conventional halogen light for 40s and argon laser for 10s, respectively. Teeth in group 3 were lased with argon laser for 10s before bracket bonding with halogen light. Group 4 was the same as group 3 except that brackets were also bonded with argon laser. In group 5 samples were bonded conventionally, immersed in an artificial caries solution for two days and then irradiated for 10s with argon laser. All samples were subjected to demineralization by artificial caries solution for 10 days. After bracket removal, samples were buccolingually sectioned and evaluated by polarized light microscopy. Decalcified lesion depth in each section was measured by a trained examiner in a blind fashion. Data were analyzed in SPSS 14 using one-way ANOVA and Tukey's HSD post hoc test.
The control group showed the greatest mean lesion depth while group 5 revealed the lowest. The laser-treated groups had significantly lower mean lesion depth compared with the control group (P<0.05) except for group 4 (P=0.192).
Argon laser irradiation for 10s before or during bracket bonding can increase caries resistance of intact and demineralized enamel.
本研究旨在评估氩激光照射对正畸托槽周围牙釉质脱矿发展及进程的影响。
将50颗无龋、完整的人类前磨牙随机分为以下五组，每组数量相等：第1组（对照组）和第2组：分别使用传统卤素灯40秒和氩激光10秒进行托槽粘结。第3组牙齿在使用卤素灯粘结托槽前用氩激光照射10秒。第4组与第3组相同，但托槽也用氩激光粘结。第5组样本按常规方法粘结，浸入人工龋溶液中两天，然后用氩激光照射10秒。所有样本用人工龋溶液脱矿10天。去除托槽后，将样本颊舌向切片，并用偏光显微镜进行评估。由一名经过培训的检查人员以盲法测量每个切片中的脱钙病变深度。使用SPSS 14软件，通过单因素方差分析和Tukey's HSD事后检验对数据进行分析。
对照组的平均病变深度最大，而第5组的平均病变深度最小。与对照组相比，激光治疗组的平均病变深度显著更低（P<0.05），但第4组除外（P=0.192）。
在托槽粘结前或粘结过程中进行10秒的氩激光照射可提高完整和脱矿牙釉质的抗龋能力。
