慢性根尖周炎根尖孔外吸收状况的扫描电镜研究

Evaluation of dental root apical foramen in external resorption of chronic periapical periodontitis by scanning electron microscopy

目的:采用扫描电镜观察慢性根尖周炎根尖孔外吸收状况,以期为临床治疗提供依据。方法:收集临床上因牙髓感染导致的慢性根尖周炎患牙牙根30颗,平均分为3组:根尖大量肉芽组织组(A组),根尖少量肉芽组织组(B组),根尖无肉芽组织组(C组);及正常牙根(2颗),作为对照组(D组)。取距解剖根尖孔6 mm的牙根,置于扫描电镜(scanning electron microscopy,SEM)下观察根尖孔表面形态。结果:A、B组根尖孔均有外吸收,且明显高于C、D组。吸收范围A、B组明显高于C、D组。A、B组部分根尖孔出现裂纹,且概率明显高于C、D组。结论:根尖含有肉芽组织的慢性根尖周炎牙根根尖孔均有吸收,其吸收范围广,且部分会出现裂纹。

Objective：To evaluate the dental root apical foramen external resorption of chronic periapical periodontitis by scanning electron microscopy. Methods：Thirty roots of chronic periapical periodontitis caused by pulp infection were collected and divided into three groups on average,the group of large amounts of apical granulation tissue（ Group A） ,that the group of small amounts of apical granulation tissue（ Group B） and the group of no apical granulation tissue（ Group C） . Group D contained two normal roots were as control group. The 6 mm distance from the apical of the roots were taken and the morphological changes of the apical were observed under the scanning electron microscopy （ SEM ） . Results：External resorption happened at apical foramen in all teeth in Group A＆amp;B,which were apparently higher than Group C＆amp;D. At the external resorption range of the apical foramen,Group A＆amp;B was apparently higher than Group C＆amp;D. Cracks appeared in some apical foramen in Group A＆amp;B,which were apparently higher than Group C＆amp;D. Conclusion：External resorption appeared in all the dental apical foramen of chronic periapical periodontitis which contained granulation tissue. Whlie the ranges were large,and cracks appeared in some apical foramen.