水雾对调Q Er:YAG激光消融牙本质阈值及损伤的影响  

Effect of Water Mist on Threshold and Damage of Dentin Ablation with Q-Switched Er:YAG Laser

作　　者：崔庆哲[1,2] 魏蒙恩 凌琳[3] 程庭清[1] 吴先友[1] 江海河[1] 

机构地区：[1]中国科学院合肥物质科学研究院医学物理与技术中心,安徽合肥230031 [2]中国科学技术大学,安徽合肥230026 [3]中国科学院合肥物质科学研究院肿瘤医院,安徽合肥230031

出　　处：《中国激光》2016年第12期26-31,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(61275118);国家自然科学基金委员会和中国工程物理研究院联合基金(U1230131);中国科学院战略性先导科技专项(XDA0804010902)

摘　　要：研究了调QEr：YAG激光消融离体牙本质过程中水雾的作用及其对消融后牙本质微结构的影响。调QEr：YAG激光重复频率为3Hz，脉冲宽度为62ns，作用脉冲数为10，能量范围为4～70mJ，水雾流量分别为0，4，9，13mL／min时消融牙本质。每种实验条件下消融10个牙本质样品，利用扫描电镜观察消融坑洞微结构。实验结果表明，随着水雾流量的增加，调QEr：YAG激光对人牙本质的消融阈值呈逐渐增加的趋势，牙本质所受机械损伤减小。实验结果对了解调QEr：YAG激光消融牙硬组织的微观结构及牙科治疗应用具有参考价值。The effect of water mist on the extracted dentin ablation by Q-switched Er： YAG laser is investigated, and the influence of water mist on the ablated dentin microstructure is studied. The Q-switched Er： YAG laser with 62 ns pulse width is used to ablate the human dentin at the repetition rate of 3 Hz, the number of pulses is 10, and the energy range is from 4 mJ to 70 mJ. Different flow rates of water mist （0, 4, 9, 13 mL/min） are applied during the experiments. 10 dentin samples are ablated under each experimental condition. A scanning electron microscope is used to observe the microstructures of ablated holes. The experiment result shows that the increase of flow rate of water mist makes the Q-switched Er： YAG laser ablation threshold to dentin rise, and the dentin is protected from mechanical damage. The results are guided for acquiring microstructures during dentin ablation with Q-switched Er： YAG laser and practical treatment in dentistry.

关 键 词：激光技术 调Q ER:YAG激光 水雾流量 牙本质 组织消融 

分 类 号：R318.51[医药卫生—生物医学工程]