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Article
Fracture resistance of premolars with bonded amalgam restorations

Authors: Abdul–Haq A Suleiman --- Mohammad Gh Hamdoon
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2003 Volume: 3 Issue: 2 Pages: 156-160
Publisher: Mosul University جامعة الموصل

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Abstract

The aim of this in vitro study is to evaluate the fracture resistance of premolars with three surface amalgam restorations. Fifty premolars were used, and divided into five groups. The teeth in group one remains intact whereas the teeth in the second group prepared and not restored. The teeth in the third group prepared and restored with amalgam only. In groups four and five, the amalgam restorations were lined with All–Bond 2 and Scotchbond Multi Purpose Plus respectively. After thermocycling, the teeth were tested under universal compression machine at a crosshead speed 5 mm/minute. Data were analyzed using one way Analysis of Variance and Duncan’s Multiple Range Test. The results of this study indicates that both Scotchbond Multi Purpose Plus and All–Bond 2 increase the fracture resistance as compared to the control groups (groups two and three). The results of this study also show no significant difference between the two bonding agents regarding teeth fracture resistance.


Article
Determination of residual dentin caries after conventional mechanical and chemomechanical caries removal with Carisolv™

Authors: Abdul–Haq A Suleiman --- Omar S Rahawi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2006 Volume: 6 Issue: 3 Pages: S101-S106
Publisher: Mosul University جامعة الموصل

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Abstract

To examine the efficacy of chemo–mechanical dentin removal method in vitro. Material and Methods: Forty eight extracted permanent teeth with occlusal caries. The dentin caries of each tooth was removed either with chemo–mechanical method using Carisolv™ or mechanically using round bur. Cutting and caries removal monitored by checking the hardness of dentin with a dental explorer and stopped when teeth in each group showed either a leather hard texture or a sharp scratching sound was heard. The caries activity of the remaining dentin was assessed by using an acid red as a caries indicator. The mean surface areas of the pink zone (caries active, pH <5.5) and yellow zone (caries inactive, pH >5.5), of each caries lesion was calculated using AutoCAD computer software. Result: Revealed that for teeth treated with Carisolv,™ the surface area of remaining carious dentin was significantly more when it compared with teeth that treated mechanically in each group, using unpaired t– test regardless of the clinical criterion for caries removal. Conclusion: Carisolv™ is effective in caries removal when used as chemomechanical caries removal than conventional mechanical method and the mean surface areas of remaining affected carious dentin was more in chemomechanical than conventional mechanical meaning that more tooth structure is preserved using chemomechanical method.


Article
The bactericidal efficiency of Chlorhexidine as an endodontic irrigant

Authors: Abdul–Haq A Suleiman --- Ghada Y Abdul–Rahman --- Wiam M. Al–Ashou
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2006 Volume: 6 Issue: 3 Pages: S71-S78
Publisher: Mosul University جامعة الموصل

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Abstract

to determine the bactericidal efficiency of 0.75% Chlorhexidine in vitro . The time required for this irrigant to start its antimicrobial effect on the selected microorganisms isolated from the infected root canals and unidentified samples taken from root canals with necrotic pulps were evaluated. Materials and Methods: The substantive antimicrobial effect of 0.75% Chlorhexidine in vitro is also considered. Samples taken from 13 teeth with necrotic pulp from patients attended the Department of Conservative Dentistry, College of Dentistry at Mosul University. The turbidity method was applied to determine the antimicrobial effect of 0.75% Chlorhexidine and the combination of 0.5% Chlorhexidine and 0.5% sodium hypochlorite comparing with the antimicrobial effect of 2.5% sodium hypochlorite, the time required for these materials to start their antimicrobial effect on the selected microorganisms was determined using contact test. The antimicrobial effectiveness were evaluated at different time intervals, immediately, 5, 10, 15 minutes after the contact of the microorganisms with the irrigating solutions. Results: Both 0.75% Chlorhexidine and 2.5% sodium hypochlorite are effective on microorganisms collected from root canal. There is no significant difference between Chlorhexidine and sodium hypochlorite in their antimicrobial effect on the anaerobic microorganisms, but Chlorhexidine is more effective on the aerobic microorganisms. Conclusion: Chlorhexidine 0.75% and 2.5% sodium hypochlorite has an immediate effect on the selected microorganisms and unidentified samples from the teeth with necrotic pulps. The combination of Chlorhexidine 0.5% and 0.5% sodium hypochlorite has an effect started after 5 minutes

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