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Article
Impact Strength of Maxillary Complete Dentures Fabricated From Different Heat Cured Acrylic Resin Denture Base Materials

Author: Mohammed A. Abdulla
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2012 Volume: 12 Issue: 1 Pages: 24-31
Publisher: Mosul University جامعة الموصل

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Abstract

AIMS: Evaluation of the impact strength of maxillary complete dentures fabricated from new type high impact heat-cured acrylic denture base material and comparison with other types of acrylic resin denture base materials. MATERIALS AND METHODS: Three types of materials were used in this study, high impact heat-cured acrylic resin; cross-linked acrylic resin (no cadmium); and conventional heat-cured acrylic resin. Twenty four maxillary complete dentures were fabricated to be tested and divided into three groups. Group 1, Group 2, and Group3 for high impact acrylic resin, cross-linked acrylic resin, and conventional heat- cured resin, respectively. Before testing, all specimens were stored in distilled water at 37ºC for 2 months. The impact strengths (J) of the dentures were measured with a falling-weight impact test. The impact strengths of both groups were compared by a repeated measures analysis of variance (ANOVA) and Duncan's Multiple Analysis Range Test to determine the signifi-cant difference among the tested groups at (p<0.001) level of significance. RESULTS: There is a sig-nificant difference of the mean values of impact strengths for high impact acrylic resin, cross linked acrylic resin and conventional acrylic resin denture base materials at crack initiation and complete frac-ture. The impact strength between crack initiation and complete fracture within each group was signifi-cantly different (p<0.001) for all the groups, and more energy was needed for complete fracture than that for crack initiation for the high impact strength acrylic resin. CONCLUSIONS: Maxillary com-plete dentures made from high impact acrylic resin denture base material have significantly higher im-pact strength than that of maxillary complete denture made from cross-linked and conventional acrylic resin denture base materials. Maxillary complete dentures made from cross-linked acrylic resin denture base material have significantly higher impact strength than that made from conventional acrylic resin denture base materials.


Article
The Effect of Autoclave Processing on Some Properties of Cross-Linked Acrylic Denture Base Material
تاثير المعالجة بالموصدة على بعض خصائص الاكريليك المتشابك المستخدم كقاعدة لطقم الأسنان

Author: Husam Mejbel Khalaf حسام مجبل خلف
Journal: Al-Rafidain University College For Sciences مجلة كلية الرافدين الجامعة للعلوم ISSN: 16816870 Year: 2015 Issue: 36 Pages: 305-325
Publisher: Rafidain University College كلية الرافدين الجامعة

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Abstract

Background: Impact strength, surface hardness, water sorption and solubility are important properties for cross linking acrylic resin as denture base material so it is important to evaluate these properties after autoclave processing.Objectives: The aim of this research is to investigate the effect of different time durations of autoclave processing on some physical and mechanical properties of cross linking acrylic denture base materials.Materials and methods: Heat cured cross link acrylic was the acrylic denture base material included in this study. Total of (108) specimens were prepared. The specimens were grouped into: control group in which acrylic resin processed by conventional water bath processing technique and experimental groups in which acrylic resins processed by autoclave at 121°C, 210 KPa. The experimental groups were divided into group 1 (Fast) for 15 minutes. and group 2 (Slow) for 30minutes to study the effect of the autoclave processing, four tests were conducted: impact strength (Charpy tester), surface hardness (shore D), and water sorption and solubility test.Result: The results were analyzed by ANOVA. There were no significant differences between the results of the processing techniques regarding impact, hardness, and water sorption and solubility tests.Conclusions: The autoclave processing technique might also be a good alternative to the conventional water bath processing technique regardless to the cycle of autoclave processing either fast or slow.

قوة الصدمة، وصلادة السطح، وامتصاص الماء والذوبان هي من الخصائص الهامة للاكريليك المتشابك كمادة قاعدة طقم الأسنان لذلك من المهم تقييم هذه الخصائص بعد المعالجة بالموصدة.الهدف من هذا البحث: هو دراسة تأثير فترات زمنية مختلفة من معالجة المُوصَدة على بعض الخصائص الميكانيكية والفيزيائية للاكريليك المتشابك كمادة قاعدة طقم الأسنان.المواد والطرق: تم استعمال الاكريليك المتشابك المعالج حراريا في هذه الدراسة. المجموع الكلي للعينات التي تم تحضيرها هو 108. تم تقسيمها الى : مجموعة التحكم وفيها تم معالجة الاكريليك بحوض الماء التقليدي ومجموعات تجريبية تم فيها معالجة الاكريليك بالموصدة عند درجة حرارة 121° وضغط 210 كيلوباسكال. تم تقسيم المجموعات التجريبية الى المجموعة الاولى (المعالجة السريعة) لمدة 15 دقيقة والمجموعة الثانية (المعالجة البطيئة) لمدة 30 دقيقة لدراسة تأثير معالجة الموصدة. أجريت أربعة اختبارات: قوة الصدمة، والصلادة السطحية واختبارامتصاص الماء واختبار الذوبان.النتائج: عدم وجود فروق ذات دلالة إحصائية بين نتائج انواع المعالجة فيما يتعلق بقوة الصدمة، وصلادة السطح، وامتصاص الماء والذوبان.الاستنتاجات: المعالجة بالموصدة قد تكون أيضا بديلا جيدا للمعالجة بحوض الماء التقليدي بغض النظر عن مدة المعالجة سريعة كانت أو بطيئة.

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