摘要
目的:探索铸造金属桩核制作方法、粘接方法和粘接剂种类对其固位的影响。方法:选择80颗完整的新鲜无龋坏下颌单根管双尖牙,在釉牙骨质界上2mm处去除临床牙冠,行根管治疗,根管预备和铸造桩核制作及粘接。根据制作方法将80个样本分为两大组(直接法和间接法),每组40个。每组又根据粘接方法(使用螺旋输送器和未使用)和粘接剂(玻璃离子水门汀和磷酸锌水门汀)不同下分4小组,每组10个样本。将样本置于23℃室温生理盐水中存放24h后放置于万能力学测试机上,以0.5mm/min的速度进行拉力试验直到失败,从而得出固位力大小。结果:本实验中影响固位力的最明显因素为粘接方法,使用了螺旋输送器组的固位力明显高于未使用螺旋输送器组(P<0.05);不同制作方法对固位力无明显影响(P>0.05),使用磷酸锌粘接剂组固位力高于使用玻璃离子粘接剂组。然而制作方法,粘接方法和粘接剂种类间是有密切的交互作用的(P<0.05)。结论:制作方法并不影响铸造桩核的固位力,磷酸锌粘接剂性能优于玻璃离子粘接剂,粘接方法对固位力有显著的影响,建议在粘接过程中使用螺旋输送器。
Objective：To investigate the effect of fabrication technique,cement type,and cementation procedure on rentention of cast metal post and core.Methods：Eighty intact single-rooted mandibular human premolars were selected.The clinical crown was removed at 2mm above the cementoenamel junction level.Each root was prepared to receive a cast metal post and core of 10 mm in length and 1.5mm in diameter.Eighty specimens were divided into two groups according to fabrication technique（direct=40and indirect=40）.Each group was further subdivided into four groups according to the cementation type（zinc phosphate and glass ionomer）,and cementation procedure（with and without lentulo spiral）.All specimens were stored in physiological saline bath at 23℃ for 24 hours.Then the dowels were subjected to a constantly increasing tensile force in a universal Instron testing machine at crosshead speed of 0.5mm/min until failure.Results：Cementation with lentulo spiral showed greater retentive force than that without lentulo spiral（P〈0.05）.Fabrication technique showed no significant effect on retentive force（P〉0.05）.The group cemented with zinc phosphate produced greater retentive force than that of the glass ionomer group.However,there was a close interaction among fabrication technique,cementation procedure and cement type（P〈0.05）.Conclusion：Fabrication technique does not affect the retentive force of cast metal post and core.Zinc phosphate cement was better than glass ionomer cement.The cementation procedure had a significant effect on retention.Thus,it is recommended that the lentulo spiral should be used in the cementation procedure.
出处
《口腔医学研究》
CAS
CSCD
北大核心
2016年第4期408-411,共4页
Journal of Oral Science Research
关键词
桩核
固位性
直接法
间接法
Cast metal post and core
Retention
Direct technique
Indirect technique
