两种牙本质粘结系统的过度酸蚀对微拉伸粘结强度和失败模式的影响。

Over-etching effects on micro-tensile bond strength and failure patterns for two dentin bonding systems.

作者信息

Hashimoto M, Ohno H, Kaga M, Sano H, Tay F R, Oguchi H, Araki Y, Kubota M

机构信息

Department of Operative Dentistry and Endodontics, School of Dentistry, Iwate Medical University, Morioka, Iwate 020 8505, Japan.

出版信息

J Dent. 2002 Feb-Mar;30(2-3):99-105. doi: 10.1016/s0300-5712(02)00004-0.

DOI:10.1016/s0300-5712(02)00004-0

PMID:12381409

Abstract

OBJECTIVES

The purpose of this study was to determine (1) the weakest zone of resin-dentin bonds and (2) the relation between bond strength and failure mode to clarify the effect of demineralized dentin.

METHODS

Human premolars were sectioned to expose the dentin surfaces, and the dentin surfaces were conditioned with phosphoric acid for 15, 60, 120, or 180s. Resin-dentin bonded specimens were produced using two adhesives: One-Step (Bisco) and OptiBond Solo (Kerr). Each sample was sectioned to produce a beam (adhesive area: 0.9mm(2)). Microtensile bond tests were then conducted, and the mean bond strengths (n=12 for each group) were statistically compared using two-way ANOVA and Duncan's multiple-range test (p<0.05). The fractured surfaces of all specimens were examined using SEM, and the areas of failure were measured using an image analyzer.

RESULTS

For One-Step, the bond strength decreased with increase in acid-conditioning time (15s: 50.7+/-9.7, 60s: 40.8+/-11.0, 120s: 23.6+/-4.9 and 180s: 12.1+/-4.6MPa) (p<0.05). For OptiBond Solo, the bond strength in the case of 15s acid-conditioning time (42.6+/-7.9MPa) was significantly greater than that for the other times (60s: 31.9+/-10.3, 120s: 31.8+/-14.4 and 180s: 31.8+/-7.4MPa) (p<0.05). Fractography showed that the area percentage of the hybrid layer increased with increase in etching time for both systems.

CONCLUSIONS

The integrity of the hybrid layer, especially the top part, has an effect on bond strength.

摘要

目的

本研究的目的是确定（1）树脂 - 牙本质粘结的最薄弱区域，以及（2）粘结强度与失效模式之间的关系，以阐明脱矿牙本质的影响。

方法

将人类前磨牙切片以暴露牙本质表面，并用磷酸对牙本质表面进行15、60、120或180秒的处理。使用两种粘结剂制备树脂 - 牙本质粘结标本：一步法粘结剂（Bisco公司）和OptiBond Solo粘结剂（Kerr公司）。将每个样本切片制成梁（粘结面积：0.9平方毫米）。然后进行微拉伸粘结测试，并使用双向方差分析和邓肯多重范围检验（p<0.05）对每组的平均粘结强度（每组n = 12）进行统计学比较。使用扫描电子显微镜检查所有标本的断裂表面，并使用图像分析仪测量失效面积。

结果

对于一步法粘结剂，粘结强度随酸处理时间的增加而降低（15秒：50.7±9.7，60秒：40.8±11.0，120秒：23.6±4.9，180秒：12.1±4.6兆帕）（p<0.05）。对于OptiBond Solo粘结剂，酸处理时间为15秒时的粘结强度（42.6±7.9兆帕）明显高于其他时间（60秒：31.9±10.3，120秒：31.8±14.4，180秒：31.8±7.4兆帕）（p<0.05）。断裂面分析表明，对于两种系统，混合层的面积百分比均随蚀刻时间的增加而增加。