聚酸改性复合树脂与原代人牙釉质和牙本质的短期和长期粘结强度的体外比较。

An in vitro comparison of short and long term bond strengths of polyacid modified composite resins to primary human and bovine enamel and dentine.

作者信息

Titley K C, Childers S, Kulkarni G

机构信息

Dept Paediatric Dentistry, Faculty of Dentistry, University of Toronto, Toronto, Ontario, Canada.

出版信息

Eur Arch Paediatr Dent. 2006 Dec;7(4):246-52. doi: 10.1007/BF03262560.

DOI:10.1007/BF03262560

PMID:17164070

Abstract

AIM

This in vitro study compared the shear bond strengths and fracture patterns over 7 and 180 day periods of two PMCRs bonded to both human and bovine primary tooth enamel and dentine to determine if the bovine tooth model is a suitable substitute for the human tooth model.

METHODS

Flattened enamel and dentine surfaces were produced using water irrigated #600 grit SiC paper and the teeth randomly placed in groups of N=10. Cylinders of Dyrat AP (Dentsply/DeTrey) or F2000 (3M/ESPE) were bonded to the surfaces that were either etched with 37% H(3)PO(4) (etch, E groups) or treated with their respective conditioners, primers and adhesives (no etch, NE groups). The teeth were stored in distilled water at 37(o)C and shear bond strength (SBS) tested to failure at either 7 (human and bovine) or 180 days (bovine). The modes of failure were assessed under a dissecting microscope at x30.

RESULTS

In general the results showed comparable mean SBS for both human and bovine enamel with Dyract AP, E and NE and also for F2000, E. Lower enamel SBS were recorded for F2000 NE but there was no significant differences in mean SBS for bovine enamel after long term storage. For dentine, significantly larger SBS were recorded for human versus bovine teeth for all of the four bonding protocols. There were also significant species differences, the mean SBS for Dyract AP, E and F2000, E for human dentine were higher than bovine but the mean SBS for the respective NE groups showed no significant differences between species. It was concluded that 37% H(3)PO(4) has a detrimental effect on SBS for bovine dentine. Over long term storage SBS of bovine dentine bonds decreased. The modes of failure were related to SBS with varying degrees of significance.

CONCLUSION

Bovine primary incisor enamel and dentine, provided the latter is not conditioned with 37% H(3)PO(4), are suitable alternative test SBS substrates for human enamel and dentine.

摘要

目的

本体外研究比较了两种光固化复合树脂在7天和180天内与人及牛乳牙釉质和牙本质粘结的剪切粘结强度和断裂模式，以确定牛牙模型是否适合替代人牙模型。

方法

用水冲洗的#600粒度碳化硅砂纸制作平整的釉质和牙本质表面，将牙齿随机分成每组N = 10的组。将Dyrat AP（登士柏/德瑞）或F2000（3M/艾斯特）的圆柱体粘结到用37% H₃PO₄蚀刻的表面（蚀刻组，E组）或用各自的调节剂、底漆和粘合剂处理的表面（未蚀刻组，NE组）。牙齿在37℃的蒸馏水中保存，在7天（人和牛）或180天（牛）时测试剪切粘结强度（SBS）直至失效。在解剖显微镜下以30倍评估失效模式。

结果

总体而言，结果显示Dyract AP、E组和NE组以及F2000、E组的人及牛釉质的平均SBS相当。F2000 NE组的釉质SBS较低，但长期储存后牛釉质的平均SBS无显著差异。对于牙本质，在所有四种粘结方案中，人牙的SBS明显高于牛牙。也存在显著的物种差异，Dyract AP、E组和F2000、E组的人牙本质平均SBS高于牛牙，但各自NE组的平均SBS在物种间无显著差异。得出结论，37% H₃PO₄对牛牙本质的SBS有不利影响。长期储存后，牛牙本质粘结的SBS下降。失效模式与SBS有不同程度的相关性。