玻璃离子水门汀对热刺激的反应。

Response to thermal stimuli of glass ionomer cements.

作者信息

Yan Zhuoqun, Sidhu Sharanbir K, Carrick Thomas E, McCabe John F

机构信息

School of Dental Sciences, University of Newcastle, Framlington Place, Newcastle upon Tyne NE2 4BW, United Kingdom.

出版信息

Dent Mater. 2007 May;23(5):597-600. doi: 10.1016/j.dental.2006.05.001. Epub 2006 Jul 5.

DOI:10.1016/j.dental.2006.05.001

PMID:16824591

Abstract

OBJECTIVES

This study was designed to determine the dimensional changes of glass ionomers caused by thermal stimuli under both dry and wet conditions.

METHODS

Eight cylindrical specimens (6 mm x 4 mm) were made (using a stainless steel mold) of each of the following materials: a conventional luting glass ionomer, two high viscosity restorative glass ionomers, a resin-modified glass ionomer and a resin composite which was used as a control. The thermal expansion characteristics were determined by a thermal mechanical analyzer (TMA) under wet and dry conditions by heating the samples from 25 to 70 degrees C at 10 degrees C min (-1).

RESULTS

All materials showed contraction on heating in dry ambient conditions. In wet conditions, all glass ionomers maintained their original dimensions on heating, but the resin-modified glass ionomer expanded. The resin composite showed expansion in both wet and dry conditions. The results are explained in terms of the opposing effects of thermal expansion and desiccation on heating.

SIGNIFICANCE

Under wet conditions glass ionomers maintain their original dimensions when heated. This kind of behavior may be considered as 'smart' behavior.

摘要

目的

本研究旨在确定在干燥和潮湿条件下热刺激引起的玻璃离子水门汀的尺寸变化。

方法

使用不锈钢模具制作以下每种材料的八个圆柱形试样（6毫米×4毫米）：一种传统的粘结用玻璃离子水门汀、两种高粘度修复用玻璃离子水门汀、一种树脂改性玻璃离子水门汀以及用作对照的树脂复合材料。通过热机械分析仪（TMA）在潮湿和干燥条件下，以10℃/分钟（-1）的速率将样品从25℃加热至70℃来测定热膨胀特性。