中国实用口腔科杂志2025，Vol.18Issue(4)：440-446,7.DOI:10.19538/j.kq.2025.04.008
斜面洞形设计对牙根纵裂患牙粘接后抗折力的影响研究
Influence of bevel cavity design on fracture resistance of vertical fractured root after reattaching treatment
摘要
Abstract
Objective To investigate the fracture resistance of root with vertical root fracture(VRF)after reattachment with bevel cavity design.Methods The study was conducted in the scientific research laboratory of School of Stomatolo-gy,Qingdao University from January to December 2024.Totally sixty-four single-rooted bovine teeth were collected.The crowns were removed to obtain 15 mm-long root samples,and the root canals were uniformly prepared.Sixty of these samples were randomly selected for the loading experi-ment and randomly divide into 3 groups(1 control group and 2 experimental groups,n=20).The control group consisted of complete roots,and only root canals were filled;in experimental groups,roots were split to establish VRF models and the bonding surfaces were prepared.According to the preparation morphology,the experimental groups were divided into two subgroups:the bevel group(with a bevel inclined towards the root canal),and the parallel group(without bevel design).The bonding area was measured under a dental microscope after cavity preparation,and the frac-tured roots were bonded with resin.After bonding,the roots were fractured with a universal material testing machine and the fracture load was recorded.Pearson correlation analysis was used to test the correlation between the fracture resis-tance and the bonding area.The crack direction of the roots in the control group was observed under the dental micro-scope,and the fracture patterns of the tooth-material bonding surfaces in the experimental groups were recorded.The morphology of the tooth-material bonding surface in the experimental groups was also observed by scanning electron mi-croscope.VRF models of another 4 roots were prepared in the same way,and the bonding surfaces were prepared accord-ing to the morphology of the bevel group and the parallel group(2 in each group),without reattachment.The morphology of the dentinal tubule on the bonding surface was observed by scanning electron microscope.The proportion of the dentin-al tubule area of the 4 unattached samples was measured by ImageJ 1.8.0.Results The bonding area of the bevel group was obviously larger than that of the parallel group,and the difference was statistically significant(t=5.468,P＜0.001).The comparison of fracture resistance among the groups showed statistically significant differences(F=6.505,P=0.003);further pairwise comparisons between groups showed that the fracture resistance of the roots in the parallel group was obviously lower than that in the control group,and the difference was statistically significant(q=5.099,P=0.002).There was no statistically significant difference between the bevel group and the control group(q=2.420,P=0.210),nor between the bevel group and the parallel group(q=2.679,P=0.150).The analysis results of the correlation between the fracture resistance and the bonding area of the samples in the experimental groups showed that there was a positive correlation with statistical significance between the two(r=0.910,P＜0.001).Mixed fracture(type Ⅲ)was the main fracture mode in the experimental groups after loading.On the material de-bonding surfaces,numerous resin tags were observed in bevel group,while the surfaces of parallel group were smooth.For the bonding surfaces of the unattached samples,the proportion of dentinal tubule area in the parallel group was(38.39±1.60)％,which was significantly larger than that in the bevel group[(20.42±1.40)％],and the difference was statistically significant(t=19.150,P＜0.001).Conclusion The design of bevel cavity on the bonding surface can increase the bonding area and the cross-section of the exposed dentin tubules,and improve the fracture resistance of reattached root with VRF.关键词
牙根纵裂/粘接治疗/意向性牙再植/斜面洞形/抗折力Key words
vertical root fracture/reattaching treatment/intentional dental replantation/bevel cavity/fracture resistance分类
医药卫生引用本文复制引用
李慧影,王通,付静,郭婧涵,房志敏,许海平..斜面洞形设计对牙根纵裂患牙粘接后抗折力的影响研究[J].中国实用口腔科杂志,2025,18(4):440-446,7.基金项目
国家自然科学基金(81600903) （81600903）
