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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: 23 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
An extra oral prosthesis for extensive maxillofacial defect: A clinical report

Authors: BasharA.Tawfeeq --- Mohammed A. Abdulla
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: SpIss Pages: S12-S16
Publisher: Mosul University جامعة الموصل

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Abstract

AIMS: Prosthetic rehabilitation of the patient by extraoral appliance, restoring the losing eye, part of the nose, cheek, roof of the palate (left side), and improving esthetic, phonetic and mastication of the patient. METHODS: Impression and making of the working cast, Sculpture of the wax pattern, artificial eye made from acrylic resin, body of prosthesis made from acrylic resin lined with soft lining material, silicon elastomers of maxillofacial applied to the prosthesis for life like skin appearance, and delivery of the prosthesis to the patient. CONCLUSIONS: Many methods of retaining the maxillofacial prosthesis have been used like tissue under cuts,magnets, medical adhesives, osseointegrated implants or combination of them. The prognosis was poor for the prosthetic treatment because of the extensive defect size, radiation applied all around the defect area make a challenge to get benefit from implant fixed in the surrounding bony area to enhance the retention of the prosthesis, and little bony support. For the case which describe in this report, retention obtained from hard and soft tissue under cut


Article
Reinforced Microwave - Cured Acrylic Resin Denture Base Material with Glass Fibers

Authors: Mohammed A Abdulla --- Radhwan H. Hasan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2010 Volume: 10 Issue: 20 Pages: 314-321
Publisher: Mosul University جامعة الموصل

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Abstract

AIMS: To evaluation the Effect of adding glass fibers on the transverse strength and the levels of the residual monomer of specially formulated acrylic resin to be cured by microwave and heat cured acryl-ic resin denture base materials. MATERIALS AND METHODS: The materials were used in this study heat cured acrylic resin and microwave cured acrylic resin which is formulated to be cured by microwave energy( Acronacrylic resin). Thirty two samples were prepared for transverse strength test and divided into the following groups Control group (I) heat cured alone, group (II) microwave cured alone, the group (III) heat cured+fibers, group (IV) microwave cured+fibers the transverse strength was evaluated by using an Instron testing machine . Thirty two samples were prepared for residual mono-mer test and divided into four groups water bath and microwave cured with and without glass fibers, the residual monomer was evaluated by using ultraviolet visible spectrophotometer for seven days. RESULTS: Transverse strength test: Statistical Analysis of Variance(ANOVA) shows that there is significant differences at (p>0.0001)among the four groups and Duncan's multiple range test showed that microwave cured + fibers significantly higher transverse strength followed by heat cured +fibers, microwave alone, while heat alone shows significantly lowest transverse strength. Residual monomer test: Analysis of variance(ANOVA) for the four groups from the first day of immersion in water until 7th day shows that there are significant differences between the four groups in the all six days except the 7th day shows that there are no significant differences among the four groups for the level of the residual monomer. CONCLUSIONS: Microwave cured acrylic resin with glass fibers have signifi-cantly higher transverse strength than that of acrylic resin cured by water bath, also microwave cured acrylic resin have significantly lower residual monomer content from the 1st day of immersion when compared to that of water bath which show the same level of residual monomer at the 7th day of im-mersion


Article
Prosthetic Treatment for Hemimaxillectomy Patient: (A Clinical Case)

Authors: Nadira A Hatim --- Mohammed A Abdulla --- Nashwah Subhi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2018 Volume: 18 Issue: 34 Pages: 67-72
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: prosthetic rehabilitation of a maxillary defect after hemi-maxillectomy with a palatal obturator madefrom nickel chromium framework. Materials and methods: A silicon impression was made and pouredwith a dental stone to develop a definitive cast. The site, position and shape of maxillary defect determinethe path of insertion. Design the metal framework of the obturator to Class II R.P.D according to Kennedy'sclassification. Casting the framework in base-metal alloy made from nickel chromium framework, centricjaw relation was recorded. A finished prosthesis (an obturator of closed hollow-bulb type) was inserted.Conclusions: Obturator prosthesis enhancing function and speech, reduce the rate of fluids and foodpassing to the nose. Extend the border of an acrylic of the prosthesis at defect site lead to enhance both theretention and stability of the obturator.


Article
An Enveloped Auricular Prosthesis for Ear Defect: A Clinical Report

Authors: Mohammed A. Abdulla --- Salem Hazem --- Nadira A. Hatim
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: SpIss Pages: S44-S48
Publisher: Mosul University جامعة الموصل

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Abstract

Prosthetic rehabilitation of the patient by extraoral auricular appliance. Restoring defect part of the ear. Improving esthetic of the patient. METHODS: Impression taking and making of the working cast. Sculpture of the wax pattern. Try-in step for the wax pattern. Enveloped auricular prosthesis made from maxillofacial silicon elastomers. Delivery of the prosthesis to the patient. CONCLUSIONS: To make maxillofacial prosthesis, the shape, volume, position, texture and transparency of the patient's features tried to be respected. One of the greatest challenges faced is to reproduce the patient's exact skin color and provide adequate esthetics

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