桩道预备时机对纤维桩粘接强度的影响OA
Effect of post-space preparation timing on the bond strength of fiber posts
目的 比较即刻桩道预备与延迟桩道预备对iRoot SP单尖法根管充填后纤维桩粘接强度和牙根抗折强度的影响,为临床桩道预备时机的选择提供实验依据.方法 获得单位医学伦理委员会审批及研究参与者书面知情同意.将72颗离体成人单根管前磨牙随机分为两组(每组36颗):即刻桩道预备组(根管充填后立即进行桩道预备)和延迟桩道预备组(根管充填1周后进行桩道预备).使用牙科显微镜观察两组桩道预备后桩道内壁清洁程度;扫描电子显微镜观察桩道预备后牙本质表面的超微结构特征;采用牙根抗折强度实验检测两组牙根抗折强度;采用薄片推出试验检测纤维桩的粘接强度,并在体视显微镜下观察分析粘接断裂模式.结果 牙科显微镜下,即刻桩道预备组牙本质表面较延迟桩道预备组更清洁.扫描电子显微镜下,即刻桩道预备组大部分牙本质小管开放,而延迟桩道预备组牙本质小管开放不全.即刻桩道预备组抗折强度为(2 872±241.5)N,延迟桩道预备组为(2 934±353.1)N,差异无统计学意义(t=-0.328,P=0.751).薄片推出试验显示,即刻桩道预备组的推出粘接强度(10.310±2.907)MPa显著高于延迟桩道预备组(7.917±2.429)MPa,差异具有统计学意义(t=4.457,P<0.001).断裂模式分析显示,两组均主要表现为粘接剂-牙界面破坏.结论 使用iRoot SP单尖充填后,即刻桩道预备可获得优于延迟桩道预备的纤维桩粘接强度,且不影响牙根抗折强度.
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.
蓝育明;常珍;付瑞;黄佳诚
中山市口腔医院口腔急诊科,广东 中山(528400)中山市口腔医院口腔急诊科,广东 中山(528400)中山市口腔医院口腔急诊科,广东 中山(528400)中山市口腔医院口腔急诊科,广东 中山(528400)
医药卫生
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
iRoot SPsingle-cone root canal obturationimmediate post-space preparationdelayed post-space preparationdentinfiber postbond strengthroot fracture resistanceadhesive-to-dental interface failure
《口腔疾病防治》 2026 (7)
680-687,8
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.
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