摘要
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10Hz、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。
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.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.Results： 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.Conclusion： 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.
出处
《北京大学学报（医学版）》
CAS
CSCD
北大核心
2011年第5期766-769,共4页
Journal of Peking University:Health Sciences
关键词
牙本质
牙窝洞制备
显微镜检查
电子
扫描
激光
Dentin
Dental cavity preparation
Microscopy
electron
scanning
Lasers
