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Article
The Effect of Acrylic Resin Recycling on The Hardness of Artificial Acrylic Resin Denture Teeth

Authors: Mohammed M Sadoon --- Ali'a W Omari --- Nada Z Mohammed
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2009 Volume: 9 Issue: 14 Pages: 220-224
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluate the effect of recycling of denture base on the surface hardness of artificial acrylic denture teeth. Materials and methods: thirty identical artificial acrylic denture teeth of two types(cross linked and conventional denture teeth) were positioned within polyvinylchloride tubes filled with melted wax to prepare a samples within heat activated denture resin to be tested for Vickers hardnesstest before and after recycling by water bath for 1 hours at 100 °C and by microwave for 30 minutes at 80 watt then for 1.5 minute at 500 watts. Results: Showed that the water bath and microwaverecycling of denture base will not affect the hardness of conventional and cross linked denture teeth, and cross linked denture teeth are more wear resistance after recycling by microwave and water bath.Conclusions: Artificial denture teeth will not affect by double cycle of curing produced of acrylic denture base.


Article
Effect of some disinfectant solutions on the hardness property of selected soft denture liners after certain immersion periods.

Author: Basima M.A. Hussein* BDS, MSc, PhD د. باسمة محمدعلي حسين
Journal: Journal of the Faculty of Medicine مجلة كلية الطب ISSN: 00419419 Year: 2009 Volume: 51 Issue: 3 Pages: 259-264
Publisher: Baghdad University جامعة بغداد

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Abstract

Summary: Background: Disinfection of denture and soft denture liners became among the priorities for cross contamination control as well as patient's health. All the trials aimed to have maximum infection control with minimal adverse changes in the materials properties. Materials and methods: Discs of 30x2mm were made from Coe Super Soft and Coe Soft denture liners. Every 5 specimens were immersed separately and daily in CHX, Sodium hypochlorite and chlorine dioxide, control group specimens were immersed in the distilled water. Hardness property of the experimental and control groups was evaluated by using Shore A durometer after 1, 7, 30 days. Results: Statistical analysis indicated non significant differences when the control group was compared with every disinfectant solution regarding tested periods, while ANOVA test showed significant differences among tested solutions after every testing period. Further LSD attributed these differences to the chlorine dioxide since it is the only solution that decreases hardness value after immersion. Conclusion: Either of the tested solutions can be used safely regarding hardness property, although CHX and Sodium hypochlorite are more recommended since their effects on the hardness property was relatively same in comparison to the control. Keywords: CHX, Sodium hypochlorite, Chlorine dioxide, hardness, soft denture liners.

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