扫描电镜下观察铒钇铝石榴石激光备洞后的牙本质形态

目的：应用不同参数的铒钇铝石榴石(erbium:yttrium-aluminum-garnet,Er:YAG)激光对离体恒牙和乳牙制备窝洞，然后在扫描电镜下观察牙本质表面的形态。方法：将新鲜拔除的、无龋的牙冠完整的乳牙（6颗）和恒牙（4颗）共10颗分为2组，对照组4颗，包括乳牙2颗和恒牙2颗；实验组6颗，根据使用不同的激光参数分为3组：第1组2颗恒牙，第2和3组各2颗乳牙。对照组牙齿应用传统车针备洞，实验组6颗牙齿以不同的Er:YAG激光参数进行备洞，制作标本在扫描电镜下观察窝洞表面形态、牙本质小管开口、熔融和裂隙等情况。结果：扫描电镜观察发现，经不同参数的激光备洞后，乳牙和恒牙窝洞内没有发现玷污层，牙本质小管清晰。第2组乳牙经频率10 Hz、脉冲能量300 mJ的激光备洞后未发现牙本质熔融和裂隙，而第3组乳牙用频率10 Hz、脉冲能量400 mJ的激光备洞后，可见牙本质熔融和裂隙等现象。结论：乳牙和恒牙应用激光备洞均可以去除玷污层，乳牙应用频率10 Hz、脉冲能量300 mJ 的激光备洞是安全有效的，过高功率可能会损伤牙本质。

Scanning electron microscopy was used to observe dentin morphology in primary and permanent teeth treated by erbium: yttrium-aluminum-garnet laser

Objective:To observe the morphological change of cavities in teeth prepared using the erbium:yttrium-aluminum-garnet(Er:YAG) laser with different parameters.Methods: 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.Cavit...