摘要
目的比较5种不同方法预备根管后对根尖1/3根管壁的清洁能力。方法将2007年12月至2008年3月在大连市口腔医院颌面外科门诊拔除的60颗离体牙随机分为6组,每组10颗。各组的牙齿先使用Protaper进行根管预备,然后使用不同的方法处理根管壁,分别为:A组H2O2和生理盐水(对照组)、B组EDTA凝胶和5.25%的NACLO,C组超声波荡洗根管、D组Nd:YAG激光、E组超声波(蒸馏水)+EDTA、F组:超声波(5.25% NACLO)+EDTA。完成之后将样本纵向剖开,扫描电镜观察根管壁的界面,比较根尖1/3根管壁的清洁程度和牙本质小管的状态。结果对照组(A组)牙齿根尖部被玷污层全部覆盖,未见开放的牙本质小管;各实验组(B、C、D、E、F组)牙齿根尖部根管壁玷污层不同程度被去除。B、C、D、E、F组根尖1/3玷污层的评分与A组比较,差异有统计学意义(P<0.05);5个实验组间根尖1/3玷污层的评分比较,D组与E组差异无统计学意义(P>0.05),其余各组间差异均有统计学意义(P<0.05)。结论 5种不同的方法在一定程度上可去除根尖部的玷污层,以超声波(5.25%NACLO)+EDTA处理根管壁的效果最佳。
Objective To compare the ability of five techniques on cleanness at the apical third of root. Methods Sixty extracted single-rooted human teech ,randomly distributed into 6 groups ,were prepared by using Protaper rotary instru- ments and subjected to different techniques on removal of smear layer; hydrogen peroxide and normal saline（ group A） ; 5.25%sodium hypochlorite （NAOCL） and ethylenediamine tetraacetis （EDTA） gel （group B）, irrigation with ultrasonics （group C） ; with Nd： YAG laser（ group D）, EDTA gel and ultrasonics with normal saline irrigation （group E） ;EDTA gel and ultrasonics with 5.25% NAOCL irrigation （ group F）. Samples were examined under the scanning electron micro- scope （SEM） and scored for cleanness at the apical third of root and the condition of dentin tubule. Results In group A the apical root and dentine tubules were covered by smear layer. The smear layer of the other 5 groups were cleared part- ly.There were significant difference bwteen group A and other groups（P 〈 0.05）. There were no significant difference be- tween the group D and group E（P 〉 0.05）. There were significant difference among the other tested groups（P 〈 0.05）. Conclusion the smear layer at the root tip can be removed effectively by using chemical , ultrasonics and Nd：YAG la- ser. EDTA gel combined with ultrasonics and 5.25% NAOCL irrigation （group F） was best.
出处
《中国实用口腔科杂志》
CAS
2012年第9期551-554,共4页
Chinese Journal of Practical Stomatology
关键词
玷污层
扫描电镜
超声波
ND:YAG激光
smear layer
scanning electron microscope （SEM）
ultrasonics
Nd ： YAG laser
