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Article
Prosthetic Application of Newly Experimental Modeling Wax with some Additives( Medical Grass Extract)

Authors: Nadira A Hatim Department of --- Amer A Taqa --- Ahmad W Alubaidi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2012 Volume: 12 Issue: 2 Pages: 363-370
Publisher: Mosul University جامعة الموصل

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Abstract

Aims of the study: preparation of a new experimental modeling wax from hard paraffin, beeswax, starch, and medical Grass Extract (olive oil) and study the linear thermal expansion and melting point properties of the prepared wax. Materials and Methods : The samples were prepared ( 30 samples) by mixing Iraqi natural waxes (hard paraffin and beeswax) with additives (starch and olive oil) using spe-cial percentages proportions determined according to this study and using mold prepared according to ADA specification No.24, and the melting range and thermal expansion of these samples measured then compared with commercial modeling wax (SHANGCHI). Results: The new experimental model-ing wax 1 ( 80% hard paraffin + 15% beeswax + 5% olive oil) have minimum and maximum melting point mean value (59.8 – 63.6 °c) near to control (commercial modeling wax) (58 -63.4 °c) and the new experimental modeling wax 2 (90% beeswax + 5% starch + 5% olive oil) have linear thermal expan-sion mean value (0.186%) near to control (SHANGCHI) (commercial modeling wax) (0.204%). Con-clusions : The addition of olive oil to new experimental modeling wax 1(80% hard paraffin + 15% beeswax + 5% olive oil) lead to increase the linear thermal expansion and reduce the melting point, and the addition of olive oil to new experimental modeling wax 2 (90% beeswax + 5% starch + 5% olive oil) lead to decrease thermal expansion and reduce melting point.


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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