Farzin M, Panahandeh H
Assistant Professor, Department of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
J Dent (Tehran). 2010 Fall;7(4):179-84. Epub 2010 Sep 30.
The aim of this study was to evaluate the dimensional stability of casts made from an alginate impression material poured immediately and stored after specific periods.
The common alginate used in Iran (Super; Iralgin, Golchai Co., Tehran, Iran) was tested. A master model was mounted on a special device and used to obtain the impressions. These impressions were stored at 23°C (SD=1) and 4°C (SD=1) in 100% relative humidity, then poured with gypsum immediately and again after 12, 25, 45 and 60 minutes. The casts were measured with a traveling microscope with the precision of 0.5 micrometer.
The dimensional stability of the alginate and impressions were both significantly time and temperature dependent. The impressions were dimensionally stable significantly until 12 minutes of storage at room temperature and until 45 minutes of storage at 4°C (SD=1).
The dimensional stability of the alginate impressions was influenced by the storage time and environment temperature, but a humid environment and 4°C (SD=1) temperature may delay the pouring.
本研究的目的是评估由藻酸盐印模材料制成的铸型在立即灌注并在特定时间段后储存时的尺寸稳定性。
对伊朗常用的藻酸盐（Super；Iralgin，Golchai公司，伊朗德黑兰）进行测试。将一个主模型安装在一个特殊装置上并用于获取印模。这些印模在23°C（标准差=1）和4°C（标准差=1）、相对湿度100%的条件下储存，然后立即灌注石膏，并在12、25、45和60分钟后再次灌注。用精度为0.5微米的移动式显微镜测量铸型。
藻酸盐和印模的尺寸稳定性均显著依赖于时间和温度。在室温下储存至12分钟以及在4°C（标准差=1）下储存至45分钟时，印模在尺寸上显著稳定。
藻酸盐印模的尺寸稳定性受储存时间和环境温度的影响，但潮湿环境和4°C（标准差=1）的温度可能会延迟灌注。
