尖牙替代树脂复合材料修复体的断裂强度

Fracture strength of cusp replacing resin composite restorations.

作者信息

Kuijs Ruud H, Fennis Willem M M, Kreulen Cees M, Roeters Joost J M, Burgersdijk Rob C W

机构信息

Department of Preventive and Curative Dentistry, College of Dental Sciences, Faculty of Medical Science, University of Nijmegen, PO Box 9101, 6500 HB Nijmegen, The Netherlands.

出版信息

Am J Dent. 2003 Feb;16(1):13-6.

PMID:12744406

Abstract

PURPOSE

To assess the influence of an additional shoulder preparation on the fracture strength of a cusp-replacing direct resin composite restoration in a premolar that previously had an amalgam MOD restoration followed by fracture of a cusp.

MATERIALS AND METHODS

Two preparation designs were tested. In extracted sound premolars an MOD amalgam cavity was simulated followed by fracture of a cusp (Group A). Group B was the same as Group A but a shoulder was added along the cervical outline of the preparation. As a control group, cusp fracture was simulated but no MOD amalgam cavities were prepared. For each group, 14 preparations were made using a copy milling technique. All 42 preparations were restored using a direct resin composite restoration technique. Restorations were loaded until fracture.

RESULTS

The fracture strength of the preparation with shoulder was not significantly different from the preparation without the shoulder. The fracture strength of the preparations in the reference group, which had no resistance form, was significantly less than in Groups A and B (ANOVA, P<0.05).

摘要

目的

评估额外的肩台预备对一颗先前有银汞合金MOD修复体且牙尖折断的前磨牙中用于替代牙尖的直接树脂复合材料修复体的断裂强度的影响。

材料与方法

测试了两种预备设计。在拔除的完好前磨牙中模拟MOD银汞合金窝洞，随后造成牙尖折断（A组）。B组与A组相同，但在预备体的颈部轮廓处增加了一个肩台。作为对照组，模拟牙尖折断，但未制备MOD银汞合金窝洞。每组使用复制铣削技术制作14个预备体。所有42个预备体均采用直接树脂复合材料修复技术进行修复。修复体加载直至折断。