Fixed Prosthodontics, Department of Restorative Sciences, Division of Oral Health Sciences, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.
Dent Mater J. 2012 Feb 3;31(1):113-9. doi: 10.4012/dmj.2011-137. Epub 2012 Jan 21.
The purpose of this study was to evaluate the influence of flexural modulus of non-metal posts on the fracture strength and failure mode of composite resin cores. Thirty-two human premolars were divided into four groups: prefabricated glass fiber post with 1.0 mm diameter and composite resin core (Group PE1.0), that with 1.5 mm diameter and composite resin core (Group PE1.5), experimental post (flexural modulus; 4.25GPa) and composite resin core (Group EX), and preparation for abutment teeth only (Group NT). After a static loading test, the fracture strength and failure mode were recorded. Group NT (1670.81 N) showed higher fracture strength than Groups PE1.0 (866.44 N), PE1.5 (825.19 N) and EX (1075.63 N) (p<0.05). This study showed that the fracture strength of endodontically treated teeth restored with composite resin cores is not influenced by the flexural modulus of non-metal posts.
本研究旨在评估非贵金属桩的挠曲模量对复合树脂核的断裂强度和破坏模式的影响。将 32 个人类前磨牙分为四组：直径 1.0mm 的预制玻璃纤维桩和复合树脂核（组 PE1.0）、直径 1.5mm 的预制玻璃纤维桩和复合树脂核（组 PE1.5）、实验桩（挠曲模量为 4.25GPa）和复合树脂核（组 EX）以及仅预备基牙（组 NT）。进行静态加载试验后，记录断裂强度和破坏模式。组 NT（1670.81N）的断裂强度高于组 PE1.0（866.44N）、PE1.5（825.19N）和 EX（1075.63N）（p<0.05）。本研究表明，用复合树脂核修复的根管治疗牙的断裂强度不受非金属桩挠曲模量的影响。
