Abstract
Objectives: The aim of this study is to compare the setting time, which is shortened by using various different slurry water concentrations with the changes of setting expansions of plaster and stones. Materials and Methods: In this study, two improved dental stones were used to fabricate master casts and dies. The tested fabrications were BegoStone, Moldano and plaster of paris. Three specimens per stone were fabricated to be 100 mm in length and triangular in cross-section (33×50×33 mm). Mixing was performed with distilled water, tap water and 2% and 16% slurry water. The mixtures were poured into an electronic expansion-measuring device, and setting expansion values were continuously measured and recorded for 24 hours. Results: The mixtures were poured into an electronic expansion-measuring device, and setting expansion values were continuously measured and recorded for 24 hours. In the first five hour period not only did the initial setting time shorten, the amount of the expansion also increased to a considerable level. Conclusions: Within the context of this study, it was observed that not only did the initial setting time shorten but the amount of the expansion also increased to a pronounce level in the first 24 hours when slurry water was used. Unexpected results may be faced when indirect dental restorations are done within this period of time. Clinical Relevance: Dental gypsum products must have specific setting times and setting expansion. The setting rate for gypsum materials can be accelerated by various methods.
Highlights
Dental stone and plaster are referred to as the interval materials used in the fabrication of prosthesis as a last product such as, complete denture, fixed partial denture or removable orthodontic appliance in practical dentistry
Within the context of this study, it was observed that did the initial setting time shorten but the amount of the expansion increased to a pronounce level in the first 24 hours when slurry water was used
According to the multivariate (ANOVA) test results the initial setting time of a gypsum type and the expansion amounts for the times of 0.5, 1, 2, 5 and 24 hours are found to be statistically significant (p
Summary
Dental stone and plaster are referred to as the interval materials used in the fabrication of prosthesis as a last product such as, complete denture, fixed partial denture or removable orthodontic appliance in practical dentistry. A dental cast or die is plaster or stone which is poured into an impression made for a negative reproduction. With this procedure, exact copies of hard and soft tissues are obtained. The main difference between the basic powders lies with the variations in the sizes, shapes and the porosity of particles produced by the manufacture, with different methods [3]. According to their types, plaster and stones show different dimensional changes during and after their setting [2,4]. Plaster or dental stones, which sometime show high rate of setting expansion, are preferred for the purpose of compensating the expected polymerization shrinkage states of the materials used as resultant production [5,6]
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