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ORIGINAL RESEARCH
Year : 2011  |  Volume : 1  |  Issue : 6  |  Page : 306-310

The effect of additives and microwave oven drying on the compression strength of type IV dental stone


1 Reader, Dept. of Prosthodontics, Bharati Vidyapeeth Dental College, Pune, India
2 Sree Ramachandra Medical College and Hospital, Chennai, India
3 Noorul Islam College of Dental Sciences, Aralumoodu PO, Neyantinkara, Trivandrum, 695123, India

Correspondence Address:
N Vasantha Vijayaraghavan
Dept. of Prosthodontics, B-5, 402 Ganga Constella Society, Kharadi, Pune
India
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Source of Support: None, Conflict of Interest: None


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Context: Several attempts have been made to increase the compressive strength shorten the setting time of Type IV dental stone. Aims: 1. to explore the use of cured PMMA powder, and pulverized dihydrate, as modifier of Type IV dental stone. 2. To explore the use of microwave oven for accelerate drying of casts. 3. To investigate compressive strength associated with modifiers and microwave oven drying. Methods and Materials: According to ANSI/ADA Specification No.25 for Gypsum products, the specimens were made. Resin and pulverized dihydrate are added at a concentration of 1% by weight. They were also dried in microwave oven. The control group was conventional Type IV Dental stone. Statistical analysis used: One way analysis of variance (ANOVA) technique adjusted for multiple comparisons using Tukey's method was used. Results: A highly significant difference was found between modified samples and conventional control Conclusion: Within the limitations of study, it was found that resin and pulverized dihydrate can be incorporated in limited concentrations to get improved physical properties of Type IV dental stone. Microwave oven drying at a low power level for 5 minutes can be used for accelerated drying of casts' thereby earlier manipulation of casts.


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