Shaping of the Root Canal Using Er:YAG Laser Irradiation
Shaping of the Root Canal Using Er:YAG Laser Irradiation
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DOI：
10.1089/pho.2012.3226
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发表时间：
2012-07-01
影响因子：
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通讯作者：
Suda, Hideaki
中科院分区：
文献类型：
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作者：
Kokuzawa, Chizuko;Ebihara, Arata;Suda, Hideaki
目的：研究Er:YAG激光在体外根尖区的照射程度。背景资料：自激光问世以来，激光治疗在各个领域都取得了进展。然而，关于Er:YAG激光治疗根管整形的报道很少。方法：使用6颗单根人牙。根管工作长度设置为6.5 mm，根管扩大至根尖锉尺寸#25。采用Er:YAG激光器和锥形照射头(R135T和R200T)。激光照射条件为30 m J， 20 pps，水流5 mL/min。样品用每个尖端辐照三次，每次10秒。为了评估根管水平区域的切割程度，每次照射前后采用微焦x线计算机断层摄影观察激光照射表面。在扫描电子显微镜下观察样品。使用图像编辑软件（Adobe Photoshop 7.0）测量一个区域的像素。使用StatView （version 5.0）进行统计分析。采用单因素方差分析和Tukey-Kramer检验；P < 0.05为有统计学意义。结果：R200T照射根管10秒（p < 0.05）时，根管切面蒸发量较其他照射条件大（0.12 +/- 1.07 mm(2)）。扫描电镜观察无涂片层，牙本质小管开放。结论：Er:YAG激光照射根尖牙本质时，根尖牙本质的成形明显。
Objective: The purpose of the present study was to investigate the degree of Er:YAG laser irradiation at the apical area in vitro. Background data: Since the laser was developed, advancement of laser treatment has been seen in various fields. However, few reports exist on shaping of the root canal using Er:YAG laser irradiation. Methods: Six single-rooted human teeth were used. The working length of root canals was set at 6.5 mm, and they were enlarged to apical file size #25. An Er:YAG laser and cone-shaped irradiation tips (R135T and R200T) were used. Laser irradiation conditions were 30 m J, 20 pps, and water flow of 5 mL/min. Samples were irradiated three times for 10 sec each using each tip. To evaluate the cutting degree of horizontal area of the root canal, the laser-irradiated surfaces were observed using microfocus X-ray computed tomographic photography before and after every irradiation. The samples were observed under a scanning electron microscope. Measurement of pixels in an area was performed by image-editing software (Adobe Photoshop 7.0). Statistical analysis was performed using StatView (version 5.0). One-way ANOVA and the Tukey-Kramer tests were used; p < 0.05 indicated statistical significance. Results: When root canals were irradiated with R200T for 10 sec (p < 0.05), a large amount of evaporation (0.12 +/- 1.07 mm(2)) was acquired in their cut area compared with the other irradiation conditions. In scanning electron microscopic observation, there was no smear layer and the dentinal tubules were open. Conclusions: When the distance between the tip and root dentin was adjacent, the shaping of root dentin by Er:YAG laser irradiation was definitely observed.