摘要
目的:利用扫描电镜观察Er,Cr:YSGG激光处理龋坏牙本质的形态学改变,并与常规方法进行比较。方法:将24颗新拔除的患龋牙随机分成2组,每组12颗牙。第1组 常规处理组:分别用金刚砂石针、碳钢裂钻和挖器处理正常及龋坏牙本质;第2组 激光处理组:分别用2WEr,Cr:YSGG激光、4WEr,Cr:YSGG激光处理正常及龋坏牙本质。常规制片,扫描电镜下观察。结果:与常规方法相比,激光处理后的牙本质表面不平,呈鱼鳞状、片状的粗糙外观;表面清洁,无玷污层,牙本质小管口清晰可见;4W激光作用时偶见微裂;激光处理后的牙本质表面具有增加树脂黏结性的形态学改变。结论:Er,Cr:YSGG激光能有效地清除龋坏牙本质及玷污层,并可使牙体组织发生一定的形态学改变。因此,Er,Cr:YSGG激光能够替代常规去龋备洞方法。
Objective:To treat sound dentin,carious dentin either with conventional methods or with a Er,Cr:YSGG laser,to evaluate the morphological changes by Scanning Electron Microscopy(SEM),and to compare with the results.Methods:24 freshly extracted human teeth were randomly divided into two groups of twelve each.ln the first group,lesions were treated with burs in a dental handpiece and excavator;in the second group,we used the Er,Cr:YSGG laser at 2W and 4W.After treatment,the teeth were prepared for SEM microscopic observation.Results:On lasertreated teeth,scaly,flaky,rough surfaces were seen;surfaces were free of smear layer and clean with several morphological reliefs that may enhance bonding resin restoration.The laser at 4W appeared microcracks occasionally.Conclusions:The Er,Cr:YSGG laser beam can ablate carious dentin at 2W and 4W.The Er,Cr:YSGG laser seems to be effective in the treament of carious and in cavity preparation in vitro.
出处
《激光生物学报》
CAS
CSCD
2003年第2期141-144,共4页
Acta Laser Biology Sinica
