角度纤维桩核对牙根抗折能力影响的实验研究  

Effect of EverStick Post-Core on root fracture resistance with different angles

作　　者：葛绵[1] 吴国锋[1] 梁猛猛[1] 何惠明[1] 

机构地区：[1]第四军医大学口腔医学院,陕西西安710032

出　　处：《牙体牙髓牙周病学杂志》2012年第4期215-218,共4页Chinese Journal of Conservative Dentistry

摘　　要：目的:探讨不同角度可塑性纤维桩核对上颌中切牙牙根抗折能力的影响。方法:将60个离体上颌中切牙随机分为A、B两组。A组用可塑性EverStick纤维桩核修复,B组用Co-Cr合金桩核修复,两组均分别采用0°,10°,20°,30°,40°的改向修复方式,核外部制作标准厚度金属冠。将试件底座固定在电子万能试验机上,采用与牙根长轴成45°夹角的加载方式直至试件折裂。记录其折裂方式和折裂时最大负荷值。结果:A、B组之间最大负荷值有显著差异(P<0.05)。相同倾斜角度下最大负荷值A组>B组;A、B两组最大负荷值由0°～40°均逐渐递减,角度增大后纤维桩核组最大负荷值高于铸造金属桩核组。折裂方式:A组主要为牙颈部折裂,B组主要为牙根纵折。结论:金属桩核与可塑性EverStick纤维桩核修复上颌前牙唇向倾斜牙时,桩核舌向倾斜在30°之内均能满足临床需求,与金属桩核相比可塑性EverStick纤维桩核可以有效的减少牙根纵折。AIM： To compare the effect of plasticity fiber post-core on root fracture resistance of maxillary central incisor with different angles.METHODS： Sixty maxillary central incisors were randomly divided into two groups,A and B.Group A was restored with plasticity EverStick fiber post-core,and Group B with Cobalt-Chromium alloy post-core.Then they were made into standard specimens with outside of metal crown with different angles formed by Post and long axis of Core（Such as： 0°,10°,20°,30°,40°）.The specimens were fixed in electronic universal testing machine,and loaded from 45 ° angle（formed by the long axis of the root and specimen） until they fractured.The fracture mode and the maximum load values of fracture were recorded.RESULTS： The maximum load values between two groups were significantly different（P〈0.05）.The maximum load value was greater in group A than in group B at the same angle condition.The values decreased with the change of angles from 0°to 40°.The maximum value in fiber post-core group was higher than in cast metal post-core group.The fracture pattern of Group A was mainly neck fracture,but it was mainly vertical root fracture in Group B.CONCLUSION： Both plastic and metal post-core system can meet clinical needs when used to repair the anterior teeth inclined to the labial side,with an angle of no more than 30°,Compard with metal post-core,the plasticity of EverStick fiber post-core can prevent vertical root fracture much more effectively.

关 键 词：纤维桩 角度 抗折能力 折裂方式 

分 类 号：R783[医药卫生—口腔医学]