Aalaei Shima, Ganj-Khanloo Rohollah, Gholami Fatemeh
Assistant Professor, Department of Prosthodontics, Dental Caries Prevention Research Center, Qazvin University of Medical Sciences, Qazvin, Iran.
Private Practice, Zanjan, Iran.
J Dent (Tehran). 2017 Jan;14(1):31-39.
This study aimed to evaluate the effect of storage period on dimensional stability of Alginplus and Hydrogum 5.
In this in vitro experimental study, 60 impressions were taken of an upper jaw typodont, including 10 impressions for each storage period to be tested (12 minutes, 24 and 120 hours) for each type of alginate. Then, the impressions were stored in an incubator with stable temperature and humidity, and poured using a type III dental stone. Subsequently, the mesiodistal dimension, occlusogingival height, and interarch distance were measured using a digital caliper with an accuracy of 0.01mm. The data were analyzed using ANOVA and t-test (P<0.05).
Alginplus and Hydrogum 5 impressions were not significantly different from the master model after 12 minutes and 24 hours in terms of dimensions (P>0.05). After 120 hours, all dimensions measured on casts were significantly different from those measured on the master model, except for the mesiodistal dimension of the Hydrogum 5 impressions.
At a consistent temperature and humidity, the Alginplus and Hydrogum 5 impressions were dimensionally stable for at least 24 hours.
本研究旨在评估储存时间对藻酸盐印模材Alginplus和Hydrogum 5尺寸稳定性的影响。
在这项体外实验研究中，对上颌标准牙列模型制取60个印模，每种藻酸盐印模材针对每个要测试的储存时间（12分钟、24小时和120小时）制取10个印模。然后，将印模储存在温度和湿度稳定的培养箱中，并用III型牙科石膏灌注。随后，使用精度为0.01mm的数字卡尺测量近远中尺寸、咬合龈向高度和牙弓间距离。使用方差分析和t检验对数据进行分析（P<0.05）。
在12分钟和24小时后，Alginplus和Hydrogum 5印模在尺寸方面与主模型无显著差异（P>0.05）。120小时后，除Hydrogum 5印模的近远中尺寸外，铸型上测量的所有尺寸与主模型上测量的尺寸均有显著差异。
在恒定的温度和湿度下，Alginplus和Hydrogum 5印模在尺寸上至少24小时保持稳定。
