沸水处理对凝固石膏（牙科石膏）表面粗糙度和表面微观结构的影响。

Influence of boiling water treatment on surface roughness and surface microstructure of set gypsum (dental stone).

作者信息

Onizuka T, Kamimura N, Kajiwara H, Nakashima A, Suenaga K, Jimi T

机构信息

First Department of Prosthetic Dentistry, Kagoshima University Dental School, Japan.

出版信息

Dent Mater J. 1995 Dec;14(2):245-55. doi: 10.4012/dmj.14.245.

DOI:10.4012/dmj.14.245

PMID:8940563

Abstract

The influence of boiling water treatment on the surface roughness and surface microstructure of set gypsums was investigated. Typical surfaces before and after immersion in boiling water were compared by means of SEM observation, the Knoop hardness test, and a surface roughness test. The surfaces of set gypsums were rougher than that of an acrylic resin plate, and after immersion in boiling water, highly roughened surfaces and thinner crystal bodies were observed on each specimen under SEM. The knoop hardness of set gypsums was considerably lowered after boiling water immersion. That of die stones was the same or lower than set dental stones. The results showed that even brief immersion in boiling water had profound effects on the dental stone cast, resulting in rougher surfaces and lower hardness of set gypsums.

摘要

研究了沸水处理对凝固石膏表面粗糙度和表面微观结构的影响。通过扫描电子显微镜（SEM）观察、努氏硬度测试和表面粗糙度测试，比较了浸入沸水前后的典型表面。凝固石膏的表面比丙烯酸树脂板的表面更粗糙，在沸水中浸泡后，扫描电子显微镜下观察到每个试样的表面高度粗糙且晶体变薄。凝固石膏在沸水中浸泡后努氏硬度显著降低。模型石膏的努氏硬度与凝固牙石膏相同或更低。结果表明，即使短暂浸入沸水中也会对牙石膏铸型产生深远影响，导致凝固石膏表面更粗糙且硬度更低。