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Article
Evaluation of the shear bond strength of four orthodontic adhesive systems

Author: Mahmood Kh Ahmed
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2007 Volume: 7 Issue: 9 Pages: 66-70
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluate shear bond strength of four types of orthodontic adhesive systems including two–paste composite (Concise), light–cured composite (Transbond), no–mix composite (Alpha–dent) and light–cured glass ionomer cement (Fuji), and to compare shear bond strength between these four types of orthodontic adhesive systems. Materials and Methods: Forty extracted premolars and forty stainless steel mesh edge–wise brackets were used. Each type of orthodontic adhesives were used for bonding of ten brackets according to its manufacturer instructions, after setting the brackets were debonded and the shear bond strength were measured using Instron testing machine. Results: Showed that the two–paste composite (Concise) and the light–cured composite (Transbond) gives the highest bond strength, the bond strength of the glass ionomer cement (Fuji) significantly lower than that of Concise and Transbond but it was remained within the accepted level for clinical use, the no–mix composite (Alpha–dent) showed very low shear bond strength which was below the accepted value for clinical application. Conclusions: Concise and Transbond have high bond strength so that it can be used to fix orthodontic attachment in areas subjected to high force. The bond strength of the glass ionomer cement (Fuji) remains within the accepted level for clinical use with the benefit of fluoride release. Also the shear bond strength of the no–mix composite (Alpha–dent) is very low makes it not suitable for clinical use.


Article
Mesiodistal crowns angulation in Class II division 1 malocclusion

Authors: Dina A Al–Khashab --- Mahmood Kh Ahmed --- Neam F Agha
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2006 Volume: 6 Issue: 7 Pages: 53-63
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluate the mesiodistal angulation of the crowns in 50 study models (25 for each sex) ofClass II division 1 malocclusion and compare it to 38 study models (19 for each sex) of Class I normalocclusion to find the differences between the two groups so as to provide valuable information in the treatment of Class II division 1 malocclusion. Materials and Methods: Mesiodistal crown angulation is measured as the angle formed between the long axis of the crown and a line perpendicular to the occlusal plane. The data subjected to statistical analysis at p< 0.05. Descriptive statistics (mean,standard deviation, minimum, maximum), correlation for all the crowns and comparison between rightand left side, male and female and between Class I and Class II were carried out. Results: Significantdifferences in the angulation of the crowns between the two classes in the buccal segment of the upperdental arches for both sexes with significant higher values in Class II division 1 were found. For thelower arch there were significant differences in central, lateral incisors and second premolar in malesand in all crowns except first molar in females with significant higher values in Class II division 1 indicating that the crowns are more mesially inclined in Class II division 1 malocclusion. Conclusion:The crowns were more mesially inclined for Class II division 1 malocclusion than for Class I occlusion. There was a correlation among teeth in each quadrant.


Article
Prevalence of "White Spots" Around Orthodontic Brackets: A Clinical Study

Authors: Ahmad A Abdulmawjood --- Mahmood Kh Ahmed --- Ne’am R. Al- Saleem
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2012 Volume: 12 Issue: 20 Pages: 371-377
Publisher: Mosul University جامعة الموصل

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Abstract

Aim: To determine the prevalence of white spot lesions in orthodontic patients treated with fixed or-thodontic appliances at different treatment periods and to reveal the teeth most commonly affected by white spot lesions. Materials and Methods: Forty eight patients (31 females and 17 males) treated with fixed orthodontic appliance were included in this study. The patients were examined for the pres-ence of white spot before insertion of the appliance and after its removal using visual examination. Results: This study showed that there was a significant increase in the formation of white spot lesions along with the increase in treatment duration in male group, while females showed no significant dif-ference in white spots at different durations. The first molars were the most affected teeth by white spots followed by canines and second premolars. Conclusion: This clinical study showed that the teeth in buccal segment were affected by white spots more than incisors and the prevalence of white spots increased when the duration of treatment increased.

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