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Article
The Effect of Disinfectant on the Microstructure of Dental Stone at Different Time Intervals

Author: Dr. Shorouq Majid Abass B.D.S., M.Sc.* د. شروق ماجد
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2007 Volume: 4 Issue: 2 Pages: 199-205
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Gypsum products have been considered to be among the most widely used model and die materials. Modifications of these materials by adding chemicals or salts result in a change in their structure. This study was designed to evaluate the effect of the addition of Calcium Hypochlorite disinfectant on the microstructure of dental stone.Calcium Hypochlorite disinfectant in aqueous solution in different concentrations (0.5, 1.0, 1.5 and 2.0%) was added to type III dental stone. The microstructure of the dental stone samples was examined under the microscope and then photo scoped, pictures were taken at different time intervals (immediately, after 10, 30 min., 1and 2 hours) for all the test groups.The results of this study showed that at different time intervals, from the beginning of mixing of dental stone with Calcium Hypochlorite disinfectant solution, deformation in the microstructure was produced (calcium sulfate dihydrate crystals).Microscopically appearance of dental stone samples mixed with Calcium Hypochlorite disinfectant solution revealed a deformation in size and shape of the calcium sulfate dihydrate crystals when compared with the control group.


Article
The effect of glycerin-painted wax pattern on surface quality of dental stone mold

Author: Dr. Arshad F. Jassem Al-Kaabi. * د. ارشد فيصل جاسم
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2016 Volume: 13 Issue: 1 Pages: 52-56
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Aim: The aim of this study was to examine the effects of glycerin-coated wax patternon dental stone surface quality in terms of surface roughness and micro airbubble formation.Method: In this study, a total of 20 modeling wax samples were used for thehydrophilicity test (the contact angle test) divided into 2 groups (control andglycerin-painted). A total of 20 dental stone samples were also prepared forvisual and microscopic analysis divided into 2 groups (control and glycerinpainted).Results and conclusion: The contact angle data showed a significant decrease insurface hydrophilicity for the glycerin-painted group (P-value < 0.05). However,the visual and microscopical analysis did not show a prominent distinction insurface quality between the two groups, so there is no noticeable effect on dentalstone surface caused by glycerin-modified wax pattern.

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