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Article
Effect of chlorhexidine mouth wash and flouridated mouth wash on mechanical properties of orthodontic arch wires (An in vitro study)

Authors: Khawla M Awni --- Hind T Jarjees --- Hakam H Sabah
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: SpIss Pages: S150-S159
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: The aims of the this study were to measure the effect of chlorhexidine and fluoridated mouth wash on mechanical properties of stainless steel and nickel titanium wires and to study the effect of three time intervals (3, 7, and 10 days) immersion on these mechanical properties. Materials and Methods: Two types of orthodontic wires were taken which included stainless steel and superelastic nickel titanium wires (Dentaurum, Germany). The 0.016×0.016 inch wires were selected. Each type of wires divided into seven groups; control group and six experimental groups in which the wires immersed in the chlorhexidine and fluoridated mouth wash for 3, 7, and 10 days and then the mechanical properties of wires (yield stress, ultimate tensile stress, modulus of elasticity) measured by using the universal tensile testing machine. Results: The results of the present study showed that a significant difference in the mechanical properties of both stainless steel and nickel titanium wires between the control group and experimental groups immersed in the fluoridated mouth wash and this decreased in the mechanical properties as immersion time increased. Also the results of the present study showed that a non significant difference in the mechanical properties of both stainless steel and nickel titanium wires between the control group and experimental groups immersed in the chlorhexidine mouth wash. Conclusions: The results of the present study indicated that the fluoridated mouth wash decreased the mechanical properties of stainless steel and nickel titanium wires and this degradation in mechanical properties could contributed to prolong orthodontic treatment. While the chlorhexidine has no effect on mechanical properties of stainless steel and nickel titanium wires


Article
Success and failure rates of orthodontic micro implants (a clinical study)

Authors: Zaid S Tawfiq --- Mahmood Kh Ahmad --- Ahmad A Abdulmawjood
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2011 Volume: 11 Issue: SpIss Pages: S131-S135
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluate the rates of success and failure regarding the mobility of orthodontic microimplants in patients undergoing fixed orthodontic appliance treatment. Materials and Methods: The sample consisted of 36 titanium microimplants (AbsoAnchor®, Dentos inc. Korea) inserted in 15 female patients. The mean age for the patients was 25.53 years. Microimplants of 1.2 mm in diameter and 6–10 mm in length were used. A self–drilling method was used. A small vertical stab incision and the microimplants inserted with a screwdriver. The patients were seen periodically every 3–4 weeks. A microimplant with complete absence of a clinically detectable mobility was considered as a successful one. Whereas failure was defined as a microimplant mobility within 8 months. Results and Discussion: The total success rate for microimplants for both jaws was (86.1%). Whereas a (91.7%) success rate was recorded in the upper jaw and in the lower jaw it was (75%).Despite of higher failure rates in the mandible, which may be attributed to the occlusal force, yet they remain non significantly different from those in maxilla. Conclusions: The relatively high success rates of microimplants make them an appropriate solution for providing absolute anchorage whenever being needed in orthodontic therapy


Article
Nickel & Chromium Ions Release from Fixed Orthodontic Appliances in Iraqi patients

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Abstract

Nickel and chromium can cause hypersensitivity in some people , this study wasconducted to investigate the alteration in the nickel and chromium concentrations insaliva of patients with fixed orthodontic appliance.The investigation is comprised of 45 orthodontic patients .The selected sampledivided into 3 groups. The first group consisted of 15 patients with fixed appliancesin their upper & lower arches. The second group consisted of 15 patients with a fixedappliance placed only in the upper arch. The control group consisted of 15 patientswho were not undergoing orthodontic treatment.Nickel and chromium release was quantified with the use of an atomic absorptionspectrophotometr. The analysis of variance was used to determine if differencesexisted between the nickel and chromium release according to time interval. Foursamples of stimulated saliva were collected from each patient before insertion of fixedappliance, 1 week , 1month , and 2month after insertion of the appliance.A considerable variation in the concentrations of both nickel and chromium wasobserved. Significant differences were found between the no-appliance samples andthe samples obtained after insertion of the appliance.Nickel and chromium concentrations of saliva are significantly affected by fixedorthodontic appliances during the first 2 month of treatment.


Article
Detection of skeletal maturity using periapical radiographs (A study on Iraqi growing sample)

Author: Hayder F. Saloom حيدر فاضل سلوم
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2011 Volume: 23 Issue: special issue Pages: 155-161
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Among different treatment modalities of skeletal malocclusion, growth modification is the interceptiveprocedure undertaken in a growing child. For the growth modification to be successful it is absolutely essential that itshould be initiated at the right time. This study aimed to verify the possibility of clinical employment of thedevelopmental stage of middle phalanx of the middle finger and that of mandibular second molar in thedetermination of maturity in both genders.Materials and method: The sample consists of 216 Iraqi subjects, 108 males and 108 females, for each subject twoperiapical radiographical films were used, one for mandibular left second molar and the other for the middlephalanx of the middle finger, to determine their developmental stage according to the method described byDemirjian et al (1973) for ossification of teeth, and Hagg and Taranger (1982) that later modified by adding E ¾ stagegiven by Leite et al (1987) to describe the relation of epiphysis to metaphysis in the middle phalanx of the middlefinger.Results: A high significant correlations were found among chronological age, in years, calcification stages ofmandibular left second molar , and developmental stages of middle finger (P<0.000), with a higher puberty stage infemale than in male within the same dental calcification stage.Conclusion: The maturity stage of growing subject can be detected depending on calcification stage of mandibular2nd molar using periapical radiograph.

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