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Study of criteria of denture tooth selection Evaluation of mechanical properties of denture teeth by a dynamic viscoelastic test and an impact test.

义齿选择标准的研究通过动态粘弹性试验和冲击试验评价义齿的机械性能。

基本信息

批准号：
07672104
负责人：
SHIMOYAMA Kazuhiro
金额：
$ 1.47万
依托单位：
Tokyo Medical and Dental University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07672104/
关键词：
Denture tooth Mechanical property

项目摘要

1. An impact testThe materials were lower first molar porcelain and resin teeth. The impact test was performed with a drop impact apparatus. The acceleration of a falling impactor was measured. The aluminium impactor was 0.24N in weight and was dropped downwards onto the mesialbuccal cusp of the specimen on a steel table from a height of 15.0 cm.The absorbed energy of the resin teeth was significantly more than that of the porcelain teeth.2.Dynamic viscoelastic properties of denture teethThe purpose of this investigation was to compare dynamic viscoelastic properties of models composed of posterior denture teeth and denture base resin using a viscoelastic spectrometer. The specimens were porcelain and resin teeth mounted in denture base resin. Compressive dynamic stiffness and phase differences were measured. The stiffness of the specimens was independent of the frequency. The stiffness of the porcelain specimens was higher than that of the resin specimens measured under the same conditions. The phase lag of the specimens was dependent on the frequency. The phase lag of the porcelain specimens was lower than that of the resin specimens measured under the same conditions. This study showed taht the acrylic resin teeth had greater toughness and higher shock-absorbing ability than the porcelain teeth and that the porcelain teeth were more brittle than the acrylic resin teeth whether the teeth were isolated or in dentures.

1.材料为下颌第一磨牙烤瓷牙和树脂牙。冲击试验用跌落冲击装置进行。测量了下落冲击器的加速度。实验结果表明，树脂牙的动态粘弹力学性能明显优于瓷牙，树脂牙的动态粘弹力学性能优于瓷牙，瓷牙的动态粘弹力学性能优于树脂牙基础树脂使用粘弹性光谱仪。标本是瓷和树脂牙齿安装在义齿基托树脂。测量了压缩动态刚度和相位差。试件的刚度与频率无关。在相同条件下，瓷试件的刚度高于树脂试件。试样的相位滞后与频率有关。在相同条件下测量的陶瓷样品的相位滞后小于树脂样品。本研究表明，无论是孤立牙还是义齿，丙烯酸树脂牙的韧性和减震能力均高于瓷牙，瓷牙的脆性高于丙烯酸树脂牙。