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A Clinical Study n Discoloration of the Dental Casting Alloys

牙科铸造合金变色的临床研究

基本信息

批准号：
13672061
负责人：
TAKAYAMA Yasuko
金额：
$ 2.43万
依托单位：
Tsurumi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13672061/
关键词：
Ag-Pd-Au alloy Titanium discoloration color difference Oral Microorganism Heat treatment Surface Observation electrical potential 変色層の厚さ Fusobacterium nucleatum チタン SPM ESCA 口腔微生物

项目摘要

The present study was to evaluate discoloration and accretion on the polished surface of dental cast metal in the oral cavity.1. The findings indicated in vitro that the production of CH_3SH, H_2S was related to the discoloration of Au-Ag-Pd alloy. The dicoloration of Au-Ag-Pd alloy may also be related to the oral conditions such as periodontics, halitosis and oral care.2. The prevention of discoloration was influenced by composition of Ag-Pd-Au alloys (Cu : 10.0〜20.0 mass%, Au 12.0 or 20.0 mass%). But it was difficult to prevent to the discoloration of commercially available Ag-Pd-Au alloys with the current compositions for patients having high corrosive influence on the mouth.3. Cast clasps ware conventionally cast using Ag-20Pd-12Au alloy. After casting, the heat treatment was performed as wing manners : 1) Heated at 800℃ for 1 hour and quenched in water. 2) Heated at 800℃ for 1 hour and air cooled. As a control, cast clasps without heat treatment. Although there are significant differences in the luminance among two heat treatment and control, the luminance was markedly decreased in all conditions after delivery. On the high discoloration subjects heat treatments might be little effect.4. The pure titanium and Ag-Pd-Cu-Au alloy were installed in the partial denture by cooperating in three patients and each denture was used as usual for two months. The surfaces of the discolored specimens were confirmed to be covered with the spherical accretion. The accretion of titanium was taken away by Argon ion etching in X-ray Photoelectron Spectroscopy and its thickness was confirmed to be 0.3〜0.5μm. However, the thickness of the accretion in Ag-Pd-Cu-Au alloy could not been estimated because it was taken away by Argon ion etching.

本研究旨在评估口腔内牙科铸造金属抛光表面的变色和增生情况。 1．体外研究结果表明CH_3SH、H_2S的产生与Au-Ag-Pd合金的变色有关。 Au-Ag-Pd合金的变色也可能与牙周、口臭、口腔护理等口腔状况有关。 2．防止变色受到Ag-Pd-Au合金的组成(Cu：10.0～20.0质量％，Au 12.0或20.0质量％)的影响。但目前市售的Ag-Pd-Au合金的变色难以防止，对口腔有高腐蚀性影响的患者。 3．铸造扣件通常使用 Ag-20Pd-12Au 合金铸造。铸造后，热处理按翼方式进行： 1）800℃加热1小时，水淬。 2）800℃加热1小时，空冷。作为对照，铸造扣环未经热处理。尽管两种热处理和对照之间的亮度存在显着差异，但在交货后的所有条件下亮度均显着下降。对于高度变色的物体，热处理可能效果不大。4． 3名患者配合将纯钛和Ag-Pd-Cu-Au合金安装在局部义齿上，每颗义齿均正常使用两个月。变色样本的表面被证实覆盖有球形沉积物。用X射线光电子能谱法通过氩离子刻蚀去除钛附着物，确认其厚度为0.3〜0.5μm。然而，Ag-Pd-Cu-Au合金中沉积物的厚度无法估计，因为它被氩离子蚀刻去除了。