Influence of output energy and pulse repetition rate of the Er:YAG laser on dentin ablation
Influence of output energy and pulse repetition rate of the Er:YAG laser on dentin ablation
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DOI：
10.1089/pho.2007.2123
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发表时间：
2008-06-01
影响因子：
--
通讯作者：
Hirai, Yoshito
中科院分区：
文献类型：
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作者：
Igarashi, Akihiro;Kato, Junji;Hirai, Yoshito
目的：探讨Er: YAG激光输出能量和脉冲重复频率对牙本质消融的影响，以提高牙本质消融效率。背景资料：Er: YAG激光在牙硬组织消融方面优于其他激光。然而，影响Er: YAG激光烧蚀效率的因素尚不清楚。方法：用输出功率分别为1.0 W、1.5 W和2.0 W的Er: YAG激光在喷水下以1mm /s的速度移动，照射50块牛根牙本质板。照射后用激光显微镜测量各烧蚀部位的深度和体积，用扫描电镜观察烧蚀表面。结果：输出功率与消融深度、消融体积呈正相关。与脉冲重复频率相比，输出能量对烧蚀深度和体积的影响更为显著。在辐照牙本质下，消融部位的形状随输出功率的变化而变化，没有观察到开裂或玻璃化。牙本质消融最有效的参数是输出功率为2.0 W，输出能量为80 mJ/脉冲（25脉冲/秒）或100 mJ/脉冲（20脉冲/秒）。结论：输出能量是影响Er: YAG激光消融牙本质效果的主要因素。我们建议通过选择输出能量和重复频率的最佳组合来提高牙本质消融的效率。
Objective: We sought to improve the efficiency of dentin ablation with the Er: YAG laser by investigating the effects of output energy and pulse repetition rate on ablation.Background Data: The Er: YAG laser is superior to other lasers in ablating dental hard tissues. However, the factors affecting the efficiency of ablation with an Er: YAG laser remain unclear.Methods: Fifty bovine root dentin plates were irradiated with an Er: YAG laser at an output power of 1.0 W, 1.5 W, or 2.0 W under a water spray while moving the plate at 1 mm/sec. After irradiation, the depth and volume of each ablated site were measured by laser microscopy and the ablated surfaces were examined by scanning electron microscopy.Results: The output power showed a strong positive correlation with the depth and volume of ablation. The output energy had much more pronounced effects on the depth and volume of ablation compared to the pulse repetition rate. The shape of the ablated site varied with the output power, and no cracking or vitrification was observed under the irradiated dentin. The most effective parameters for dentin ablation were an output power of 2.0 W, with an output energy of 80 mJ/pulse at 25 pulses per second (pps) or 100 mJ/pulse at 20 pps.Conclusion: These findings suggest that the output energy is the main factor affecting the efficiency of dentin ablation with an Er: YAG laser. We propose that the efficiency of dentin ablation can be improved by choosing an optimal combination of output energy and repetition rate.