表面处理对纤维增强复合桩固位粘结强度的影响。

Effect of surface conditioning on the retentive bond strengths of fiberreinforced composite posts.

机构信息

Department of Restorative and Preventive Dentistry, School of Dental and Oral Medicine, University of Hamburg, Hamburg, Germany.

出版信息

J Prosthet Dent. 2009 Dec;102(6):368-77. doi: 10.1016/S0022-3913(09)60196-7.

DOI:10.1016/S0022-3913(09)60196-7

PMID:19961995

Abstract

STATEMENT OF PROBLEM

Debonding is a common cause of failure encountered with fiber-reinforced composite (FRC) posts, and usually occurs along the post space-dentin adhesive interface. Surface conditioning of posts is expected to increase the chemical and mechanical bond between the luting composite resin and the post, but the best method has not been definitively determined.

PURPOSE

The purpose of this in vitro study was to compare the effects of 3 surface-conditioning methods on the retentive bond strengths of FRC posts using 5 composite resin materials, and compare results to those of unconditioned FRC posts as well.

MATERIAL AND METHODS

Post space preparations (DentinPost ER root post system, length of 12 mm) were performed on 200 human anterior teeth. Groups of 50 FRC posts (ISO size 90) each were treated using 1 of the following conditioning methods: silanization, etching with 5% hydrofluoric acid, tribochemical coating (CoJet system), or were left untreated (control group). FRC posts (n=10) in each group were placed using 1 of 5 composite resin materials (Calibra or RelyX Unicem resin cements or Build-It, MultiCore Flow, or Rebilda DC foundation composite resins). Following water storage (37 degrees C, 24 hours) and thermal cycling (5000 cycles, 5 degrees -55 degrees C, 30-second dwell time), tensile strength testing was performed. Fracture modes were assessed using a light microscope. Data were analyzed statistically (1-way and 2-way ANOVA, Bonferroni-Dunn correction, alpha=.05).

RESULTS

Retentive bond strengths of FRC posts luted with MultiCore Flow in combination with the CoJet system, and of posts inserted with Rebilda DC in combination with hydrofluoric acid (HF) etching as well as with the CoJet system, were significantly higher than those of the corresponding unconditioned FRC posts (P<.001). No significant differences were noted between the bond strength values of RelyX Unicem with CoJet, MultiCore Flow with CoJet, and Rebilda DC with either CoJet or HF etching (P>.05). Retentive bond strengths were significantly lower for HF etching (Calibra, RelyX Unicem, Build-It), and for the treatment with the CoJet system in combination with Build-It compared to the corresponding control groups (P<.001). Fracture modes were primarily adhesive at the post surface or cohesive within the composite resin layer or within the FRC post.

CONCLUSIONS

The retentive bond strengths differed significantly with respect to the tested combinations of conditioning method and luting composite resin.

摘要

问题陈述

脱粘是纤维增强复合材料（FRC）桩常见的失败原因，通常发生在桩间隙-牙本质粘结界面上。预计对桩进行表面处理会增加粘结复合树脂与桩之间的化学和机械粘结，但最佳方法尚未确定。

目的

本体外研究的目的是比较 3 种表面处理方法对使用 5 种复合树脂材料的 FRC 桩的保留粘结强度的影响，并将结果与未经处理的 FRC 桩进行比较。

材料和方法

在 200 个人类前牙上进行桩间隙预备（DentinPost ER 根桩系统，长度 12mm）。每组 50 个 FRC 桩（ISO 尺寸 90）分别用以下 1 种处理方法处理：硅烷化、用 5%氢氟酸蚀刻、摩擦化学涂层（CoJet 系统）或不处理（对照组）。每组中的 10 个 FRC 桩分别使用 5 种复合树脂材料（Calibra 或 RelyX Unicem 树脂水门汀或 Build-It、MultiCore Flow 或 Rebilda DC 基础复合树脂）之一进行放置。在水储存（37°C，24 小时）和热循环（5000 次循环，5°C-55°C，30 秒停留时间）后，进行拉伸强度测试。使用显微镜评估断裂模式。数据进行了统计分析（1 路和 2 路 ANOVA、Bonferroni-Dunn 校正、alpha=.05）。

结果

与未处理的 FRC 桩相比，用 MultiCore Flow 组合 CoJet 系统粘结的 FRC 桩以及用 Rebilda DC 组合氢氟酸（HF）蚀刻和 CoJet 系统粘结的桩的保留粘结强度明显更高（P<.001）。用 CoJet 组合的 RelyX Unicem、MultiCore Flow 组合 CoJet 以及 Rebilda DC 组合 CoJet 或 HF 蚀刻的粘结强度值之间没有显著差异（P>.05）。HF 蚀刻（Calibra、RelyX Unicem、Build-It）和 CoJet 系统与 Build-It 联合处理的粘结强度明显低于相应的对照组（P<.001）。断裂模式主要为桩表面的粘着或复合树脂层内或 FRC 桩内的内聚。