牙本质内源性湿润对不同粘结系统剪切强度影响的比较研究

发布时间：2018-04-13 23:20

本文选题：内源性湿润 + 剩余牙本质厚度　；参考：《广西医科大学》2017年硕士论文

【摘要】：目的:在模拟髓腔压力的条件下,比较牙本质内源性湿润对不同粘结系统的剪切强度的影响。方法:72颗无龋第三磨牙部分截冠暴露牙本质层,并测量剩余牙本质厚度,随机分为三组,自酸蚀两步法粘结剂Clearfil SE Bond(SE),自酸蚀一步法粘结剂Clearfil S3 Bond(S3)及全酸蚀粘结剂PrimeBond NT(PB)3个组,每组24个样本。在模拟髓腔压力下,3个组样本采用相应的粘结剂处理并进行树脂充填,充填完毕后,指甲油封闭样本,储存于模拟髓腔压力装置,24h后进行剪切强度测试。结果:三个粘结剂组样本剩余牙本质厚度两两比较,均无统计学差异(P0.05)。PB粘结剂组,牙本质厚度与剪切强度呈显著正相关(r=0.764,P0.05),SE粘结剂组牙本质厚度与剪切强度无明显相关性(r=-0.15,P0.05),S3粘结剂组牙本质厚度与剪切强度无明显相关性(r=0.165,P0.05)。PB和SE组剪切强度差异无统计学意义(P0.05),但PB和SE组的剪切强度均明显大于S3组(P0.05)。结论:在模拟髓腔压力诱导内源性湿润的条件下,全酸蚀粘结系统的粘结剂PB剪切强度与牙本质厚度有一定的相关性。自酸蚀粘结系统的双组份粘结剂SE的剪切强度与牙本质厚度没有相关性,提示窝洞的深度对剪切强度无明显影响。自酸蚀系统中的双组份粘结剂SE和全酸蚀系统的PB粘结剂剪切强度无明显差别,自酸蚀粘结系统中的单组份粘结剂的所获得的剪切强度较低,提示粘结强度可能不足。
[Abstract]:Aim: to compare the effect of endodontic wetting on shear strength of different bonding systems under simulated pulp cavity pressure.Methods Seventy-two caries free third molars were exposed to dentin layer, and the thickness of residual dentin was measured. They were randomly divided into three groups: Clearfil SE BondSer, Clearfil S3 BondS3, and PrimeBond NTB, respectively.Each group of 24 samples.Under the simulated pulp cavity pressure, the three groups were treated with corresponding binder and filled with resin. After filling, nail polish was sealed and stored in the simulated pulp chamber pressure device for 24 hours to test the shear strength.Results: there was no significant difference in residual dentin thickness among the three binder groups.There was significant positive correlation between dentin thickness and shear strength. There was no significant correlation between dentin thickness and shear strength. There was no significant correlation between dentin thickness and shear strength. There was no significant correlation between dentin thickness and shear strength in dentine thickness and shear strength. There was no significant difference between dentine thickness and shear strength in SE group and SE group.But the shear strength of PB and SE group was significantly higher than that of S3 group.Conclusion: under the condition of simulating endogenic wetting induced by pulp cavity pressure, PB shear strength of the whole acid etching bonding system is correlated with dentin thickness to some extent.The shear strength of self-etching binder SE has no correlation with dentin thickness, suggesting that the depth of cavity has no effect on shear strength.The shear strength of the binder SE in the self-etching system is not significantly different from that of the PB binder in the whole acid etching system, but the shear strength of the single-component binder in the self-etching system is low, which suggests that the bond strength may be insufficient.
【学位授予单位】：广西医科大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：R783.3

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