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Article
Color Stability of Different Aesthetic Archwires (An In vitro study)

Authors: Zainab Th. Noori --- Nidhal H. Ghaib نضال حسين غايب
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 1 Pages: 164-168
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Coated aesthetic archwires are currently the existing solutions for the esthetic problem, but the color ofthese archwires tends to change overtime. This study was aimed to evaluate the color stability of different types ofesthetic archwires from four different companies at different time periods after immersion of two different stainingdrinks which are tea and Pepsi cola.Materials and methods: 48 specimens were prepared, each specimen contains 10 aesthetic archwires; and weredivided according to type of solution into two groups: A (tea) &B (Pepsi cola); each group contained 24 specimens(12 specimens were immersed in the staining solution as 4 specimens for each time intervals and 12 specimens wereimmersed in distilled water as control group). Each subgroup contains one specimen from each company. Colormeasurements were performed by means of a computed spectrophotometer according to the CommissionInternationale de I’Eclairage L*a*b* system, and color changes (ΔE*) and National Bureau of Standards units.Results: Both staining solution caused color change in variable degree and the higher amount of color instability wasfound for the archwires from the Hubit Company while the least amount of color change was for the archwires fromthe Orthotechnology Company.Conclusion: The tea caused highly significant change on the aesthetic archwires which is higher than the effect ofthe Pepsi cola


Article
Evaluation of Mandibular Third Molar Position by Using Space-Width Ratio Method

Authors: Istabraq M. Mohamed استبرق محمد --- Nidhal H. Ghaib نضال حسين غايب
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 4 Pages: 168-171
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The prediction of changes in the mandibular third molar position and eruption is an important clinical concern because third molar retention may be beneficial for orthodontic anchorage. The aims of this study were to assess the mandibular third molar position by using medical CT scan and lateral reconstructed radiograph and evaluate gender differences.Materials and Methods: The sample of present study consisted of 39 patients (18 males and 21 females) with age range 11-15 years who were attending at Al-Suwayra General Hospital/ the Computerized Tomography department. The distance from anterior edge of ramus to distal surface of permanent mandibular second molar and mesio-distal width of developing mandibular third molar were measured in both three dimensional volumetric and two dimensional CT derived lateral images. The statistical analyses included: means, standard deviations. Paired t-test was used to compare between the two methods and independent t-test was used in verifying the genders difference.Results: The results showed that there was high significant method difference between 3D CT and 2D image and gender differences were observed in values of linear measurements of present study, as males showed higher mean values than females.Conclusion: There is high accuracy of measurement on CT images, so C.T. scan is advisable during the diagnosis and treatment plan of orthodontic cases

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