不同间隔时间预备不同桩核系统对桩核微渗漏的影响

Effect of different interval time preparation on the retention of different posts and cores

目的:研究不同间隔时间预备不同桩核系统对微渗漏的影响。方法:收集因正畸需要拔除的132颗下颌单根前磨牙,进行根管治疗、根管预备和桩核制作及粘结。132颗牙随机分为4组,分别在桩核粘固后5 min、15 min、30 min、24 h,阴性对照组进行牙体预备,每组内再随机分为铸造桩核磷酸锌粘固、铸造桩核聚羧酸锌粘固和玻璃纤维桩核树脂粘固亚组。每一标本进行染色法评价微渗漏情况。结果:相同的桩核系统中,渗漏值随着桩核粘固间隔时间的延长而降低;相同的间隔时间下,5 min、15 min和24 h时,纤维桩核系统的渗漏值最小,与其它两组比较均有统计学意义(P<0.05),30 min时铸造桩核磷酸锌粘固组与纤维桩核系统组无统计学意义(P>0.05)。结论:不同间隔时间预备不同桩核系统对桩核微渗漏值有影响,为了桩核的稳固,应尽量在桩核粘固24 h后进行牙体预备。

Objective：To investigate the effect of different interval time preparation on the microleakage of different posts and cores.Method：One hundred and thirty-two extracted intact mandibular human premolars with single root were involved in this study.Premolars were randomly divided into four groups and subjected to prepared at 5 minutes,15 minutes,30minutes,and 24 hours after cement.Four groups were then randomly divided into three subgroups：cast posts and zinc phosphate cement,cast posts and zinc poly crylate cement and fiber posts and resin cement.The assessment of the microleakage was done.Rsult：Microleakage of the same posts significantly decreased as the timing of tooth preparation increased.At the same interval time 5 minutes,15 minutes,and 24 hours,the microleakage of the fiber posts had significant differences with the others （P ＜0.01）.the microleakage of the cast posts and zinc phosphate cement had no difference with fiber posts at 30 minutes （P ＞0.05）.Conclusion：The different interval time preparation has significant effect on the microleakage of posts.