Zhang Sun, Chen Tao, Ge Li-hong
Department of Pediatric Dentistry, Peking University School and Hospital of Stomatology, Beijing 100081, China.
Beijing Da Xue Xue Bao Yi Xue Ban. 2011 Oct 18;43(5):766-9.
To observe the morphological change of cavities in teeth prepared using the erbium: yttrium-aluminum-garnet (Er:YAG) laser with different parameters.
Ten extracted cavity-free molars were divided into control group and experiment group. The control group included 2 permanent teeth and 2 primary teeth. The experiment group was divided into 3 groups according to the different laser parameters. Group 1 included 2 permanent teeth, while group 2 and group 3 included 2 primary teeth respectively. Cavities were prepared using traditional handpieces in the control group or the Er: YAG laser with different parameters in the experiment group (group 1: Er:YAG laser 20 Hz/200 mJ,group 2: Er:YAG laser 10 Hz/300 mJ,group 3: Er:YAG laser 10 Hz/400 mJ) .The samples were made for Scanning Electron Microscopy(SEM) analysis.
The dentin surface of cavities using Er:YAG laser showed no formation of smear layer and open dentinal tubules. Dentin melting was not detected after preparation of groups 1 and 2. There were cracks and micro-fissures in the dentin surface of the primary teeth prepared using Er:YAG laser 10 Hz/400 mJ.
Appropriate Er:YAG laser parameters(groups1 and 2) were effective and safe for ablation of hard tissue of primary and permanent teeth. The high power Er: YAG laser 10 Hz/400 mJ would damage the dentin surface when used in primary teeth.
观察使用不同参数的铒：钇铝石榴石（Er:YAG）激光制备牙齿洞形的形态学变化。
选取10颗拔除的无龋磨牙，分为对照组和实验组。对照组包括2颗恒牙和2颗乳牙。实验组根据不同激光参数分为3组。第1组包括2颗恒牙，第2组和第3组分别包括2颗乳牙。对照组使用传统手机制备洞形，实验组使用不同参数的Er:YAG激光制备洞形（第1组：Er:YAG激光20Hz/200mJ，第2组：Er:YAG激光10Hz/300mJ，第3组：Er:YAG激光10Hz/400mJ）。制备样本用于扫描电子显微镜（SEM）分析。
使用Er:YAG激光制备的洞形的牙本质表面未形成玷污层，牙本质小管开放。第1组和第2组制备后未检测到牙本质熔化。使用10Hz/400mJ的Er:YAG激光制备的乳牙牙本质表面有裂纹和微裂隙。
适当的Er:YAG激光参数（第1组和第2组）对恒牙和乳牙硬组织的消融有效且安全。高功率的10Hz/400mJ Er:YAG激光用于乳牙时会损伤牙本质表面。
