口腔疾病防治2026，Vol.34Issue(7)：680-687,8.DOI:10.12016/j.issn.2096-1456.202550574
桩道预备时机对纤维桩粘接强度的影响
Effect of post-space preparation timing on the bond strength of fiber posts
摘要
Abstract
Objective To compare the effects of immediate versus delayed post-space preparation on the bond strength of fiber posts and the fracture resistance of roots after root canal obturation using iRoot SP and the single-cone technique,and to provide an experimental basis for the selection of the timing of clinical post-space preparation.Meth-ods This study was approved by the Medical Ethics Committee of the institution,and written informed consent was ob-tained from all participants.Seventy-two extracted human single-rooted premolars were randomly divided into two groups(n=36 each):the immediate post-space preparation group(post-space preparation performed immediately after root canal obturation)and the delayed post-space preparation group(post-space preparation performed 1 week after root canal obturation).Cleanliness of the root canal walls was assessed with a dental microscope after preparation in both groups;the ultrastructural characteristics of the dentinal surface were examined via scanning electron microscopy;the fracture resistance of roots was measured with root fracture resistance tests;the bond strength of the fiber posts was mea-sured with the thin-slice push-out test;and the bond failure modes were observed and analyzed under a stereomicro-scope.Results Under dental microscopy,the dentin surface of the immediate post-space preparation group appeared cleaner than that of the delayed post-space preparation group.Scanning electron microscopy revealed that most dentinal tubules remained open in the immediate post-space preparation group,while the tubules in the delayed post-space preparation group showed incomplete patency.The fracture resistance of the immediate post-space preparation group was(2 872±241.5)N and that of the delayed post-space preparation group was(2 934±353.1)N,with no statistically significant difference(t=-0.328,P=0.751).The push-out bond strength of the immediate post-space preparation group(10.310±2.907)MPa was significantly higher than that of the delayed post-space preparation group(7.917±2.429)MPa,with a statistically significant difference(t=4.457,P<0.001).Analysis of failure modes showed that adhesive-to-dental interface failure was the predominant mode in both groups.Conclusion Following root canal obtu-ration with iRoot SP using the single-cone technique,immediate post-space preparation yields superior fiber post bond strength compared to delayed post-space preparation,without compromising root fracture resistance.关键词
iRoot SP/单尖根管充填/即刻桩道预备/延迟桩道预备/牙本质/纤维桩/粘接强度/牙根抗折强度/粘接剂-牙界面破坏Key words
iRoot SP/single-cone root canal obturation/immediate post-space preparation/delayed post-space preparation/dentin/fiber post/bond strength/root fracture resistance/adhesive-to-dental interface failure分类
医药卫生引用本文复制引用
蓝育明,常珍,付瑞,黄佳诚..桩道预备时机对纤维桩粘接强度的影响[J].口腔疾病防治,2026,34(7):680-687,8.基金项目
中山市医学科研项目(2020A020545) This study was supported by the grant from Zhongshan Medical Scientific Research Project(No.2020A020545).The funder had no role in the study design,data collection and analysis,decision to publish,or preparation of the manuscript. （2020A020545）
