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首页> 外文期刊>Journal of clinical laser medicine and surgery >Effects of water flow on dental hard tissue ablation using Er:YAG laser.
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Effects of water flow on dental hard tissue ablation using Er:YAG laser.

机译：使用Er：YAG激光水流对牙齿硬组织消融的影响。

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OBJECTIVE: The aim of this study was to investigate the effect of water on dental hard tissue ablation using Er:YAG laser as it relates to energy and pulse repetition rate, and determine the water flow rate that produces the most effective ablation at a given irradiation condition. BACKGROUND DATA: Er:YAG laser application leads to volumetric expansion and micro-explosions that result in hard tissue ablation. Ablation efficiency is improved when combined with fine water spray. MATERIALS AND METHODS: Extracted, healthy human molars were sectioned into two pieces and categorized into small groups related to water flow rate (1.69, 6.75, and 13.5 mL/min), pulse energy (250 and 400 mJ), and pulse repetition rate (5, 10, and 20 Hz). Within the combination of irradiation parameters, a laser beam was applied over enamel and dentin surfaces of the specimens, and the ablation amount was determined by differences in weight before and after irradiation. RESULTS: At a pulse energy of 250 mJ, the most effective ablation resulted from a water flow rate of 1.69 mL/min in both enamel and dentin. With 400 mJ/pulse, dentin removal was most effective at the water flow rate of 1.69 mL/min, whereas the efficiency of enamel ablation was the highest at 6.75 mL/min. Dental hard tissue ablated better as energy and pulse repetition rate increased. CONCLUSION: Effective ablation of dental hard tissue using Er:YAG laser requires that the appropriate water flow rate correspond properly to irradiation conditions. The results of this study suggest the following parameters; a water flow rate of 1.69 mL/min for enamel and dentin ablation at a pulse energy of 250 mJ and for dentin ablation at 400 mJ/pulse, and a water flow rate of 6.75 mL/min for enamel ablation at a pulse energy of 400 mJ, regardless of pulse repetition rate of 5, 10, and 20 Hz.
机译：目的：本研究的目的是研究水对Er：YAG激光对牙齿硬组织消融的影响，因为它与能量和脉冲重复频率有关，并确定在给定照射下产生最有效消融的水流速健康）状况。背景数据：Er：YAG激光的应用导致体积膨胀和微爆炸，从而导致硬组织消融。当与细水雾结合使用时，烧蚀效率得到改善。材料与方法：将提取的健康人类磨牙切成两半，分为与水流速（1.69、6.75和13.5 mL / min），脉冲能量（250和400 mJ）和脉冲重复频率（ 5、10和20 Hz）。在辐照参数的组合内，将激光束照射在标本的牙釉质和牙本质表面上，并根据辐照前后的重量差异确定消融量。结果：在250 mJ的脉冲能量下，牙釉质和牙本质中的水流速为1.69 mL / min，是最有效的消融。在400 mJ /脉冲的情况下，在1.69 mL / min的水流速下，牙本质的去除效果最为显着，而釉质消融的效率最高，为6.75 mL / min。随着能量和脉冲重复频率的增加，牙齿硬组织的消融效果更好。结论：使用Er：YAG激光有效消融牙齿硬组织需要适当的水流量与辐照条件相对应。这项研究的结果提出了以下参数：牙釉质和牙本质消融的水流量为1.69 mL / min，脉冲能量为250 mJ，牙本质消融的水流量为600 mJ / pulse，牙釉质消融的水流量为6.75 mL / min，脉冲能量为400 mJ mJ，无论5、10和20 Hz的脉冲重复率如何。

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