不同冠修复材料和粘结剂修复的牙根应力分布研究。

Investigation of stress distribution in roots restored with different crown materials and luting agents.

作者信息

Suzuki Chikako, Miura Hiroyuki, Okada Daizo, Komada Wataru

机构信息

Fixed Prosthodontics, Department of Restorative Science, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan.

出版信息

Dent Mater J. 2008 Mar;27(2):229-36. doi: 10.4012/dmj.27.229.

DOI:10.4012/dmj.27.229

PMID:18540397

Abstract

The purpose of this study was to identify crown materials and luting agents that would decrease the stress concentrated at the roots of endodontically treated teeth. To this end, natural tooth model (NT), full cast crown model (gold-silver-palladium alloy; MC), polymer-based restorative material crown model (HCC), and all-ceramic crown model (ACC) were constructed. In each model, methyl methacrylate-based resin cement (MMA) and composite cement (CC) were used as luting agents. The magnitudes of von Mises stress of the roots during function were compared. When the luting agent was changed from MMA to CC, von Mises stress in the cervical area decreased by 37.8% for MC, 27.1% for HCC, and 37.0% for ACC. Within the limitations of this study, the combination of HCC and CC gave rise to the lowest stress concentration at the cervical area.

摘要

本研究的目的是确定能够降低根管治疗后牙齿根部应力集中的冠修复材料和粘结剂。为此，构建了天然牙模型（NT）、全冠铸造模型（金银钯合金；MC）、聚合物基修复材料冠模型（HCC）和全瓷冠模型（ACC）。在每个模型中，使用甲基丙烯酸甲酯基树脂粘结剂（MMA）和复合粘结剂（CC）作为粘结剂。比较了功能状态下牙根的冯·米塞斯应力大小。当粘结剂从MMA更换为CC时，MC的颈部区域冯·米塞斯应力降低了37.8%，HCC降低了27.1%，ACC降低了37.0%。在本研究的局限性范围内，HCC与CC的组合在颈部区域产生的应力集中最低。