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Article
Hard palate bone density and thickness determination using CT scan and their relationships with body compositions measured by bioelectrical impedance analysis for Iraqi adult sample

Authors: Zahraa M. Al- Fadily --- Hadeel A. Al- Hashimi
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2015 Volume: 27 Issue: 2 Pages: 163-172
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: This study was conducted to evaluate the hard palate bone density and thickness during 3rd and 4thdecades and their relationships with body mass index (BMI) and compositions, to allow more accurate mini-implantplacement.Materials and method: Computed tomographic (CT) images were obtained for 60 patients (30 males and 30females) with age range 20-39 years. The hard palate bone density and thickness were measured at 20 sites at theintersection of five anterioposterior and four mediolateral reference lines with 6 and 3 mm intervals from incisiveforamen and mid-palatal suture respectively. Diagnostic scale operates according to the bioelectric impedanceanalysis principle was used to measure body weight; percentages of body fat, water, and muscle; bone mass; andbasal and active metabolic rates.Results: No significant difference in overall bone density and thickness of hard palate during 3rd and 4th decades. Thegender should be considered in regard to bone thickness. Cortical bone density and thickness showed a tendencyto decrease posteriorly, while the cancellous bone density showed a tendency to increase posteriorly. In themediolateral areas, no specific patterns were observed. With increasing BMI, the cortical bone density wasincreased. The relationships of bone density and thickness with most scale measurements were not significant.Conclusion: Mini-implants for orthodontic anchorage can be effectively placed in most areas of hard palateregarding the bone density. While regarding bone thickness, care should be taken during the planning of theirplacement in hard palate. A new classification for bone thickness of hard palate has been developed


Article
Bone density determination for the maxilla and the mandible in different age groups by using computerized tomography (Part I)

Authors: Sarah M. Tewfiq سارة توفيق --- Hadeel A. Al- Hashimi هديل علي الهاشمي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 1 Pages: 164-170
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Mini implant stability is primarily related to local bone density; no studies have evaluated bone densityrelated to mini implant placement for orthodontic anchorage between different age groups in the maxilla and themandible. The present research aims to evaluate side, gender, age, and regional differences in bone density of thealveolar bone at various orthodontic implant sites.Materials and method: Fifty three individuals who were divided into two groups according to their age into: group I(ages 16-20 years) and group II (ages 21-29 years) had subjected to clinical examination, then 64-multislicecomputed tomography scan data were evaluated and bone density was measured in Hounsfield unit at 102 points(51 in the maxilla and 51 in the mandible), and mean alveolar bone density was calculated at each site in the CTaxial plane.Results: No significant differences in bone density between the sides and gender were found. Generally, the bonedensity measurements of group I and II were not statistically different at almost most sites. The mean bone density ofthe alveolar cortical bone was greater in the mandible than in the maxilla and showed a progressive increase fromthe anterior to the posterior area, while in the maxilla the highest bone density was at the premolars region. Themaxillary tuberosity was the region with lowest bone density. Cancellous bone had almost comparable densitiesbetween the mandible and the maxilla and its density was less than those of cortical sites.Conclusion: When mini implants are indicated, no gender and side differences affect the success rate regardingbone density; while age and area should be considered when selecting and placing mini implants for orthodonticanchorage.


Article
Orthodontic considerations of functional occlusion in Class І normal occlusion

Authors: Doaa B. Al-Nassar دعاء باسل النصار --- Hadeel A. Al-Hashimi
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2015 Volume: 27 Issue: 3 Pages: 130-139
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The therapeutic goal of orthodontic treatment is to establish ideal occlusion which includes both staticand functional aspects. The objective of this study was to clarify functional occlusal treatment goals by analyzingfunctional occlusion in subjects with established normal occlusion and identify the differences between canineprotected occlusion and group function occlusion.Materials and Methods: The sample consisted of 62 subjects with normal occlusion and with an age range of (18-25years).Functional occlusal contacts during lateral excursion were identified on a fully adjustable articulator, and thenthe samples were classified according to:1) Type of functional occlusion:A) Canine protected occlusion group (canine protected occlusion on both working sides).B) Group function occlusion group (group function occlusion on both working sides).C) Mixed functional occlusion group (canine protected occlusion on one side and group function occlusion on theother side.)2) Working side contact into: Canine protected occlusion (62 sides) and group function occlusion (62 sides). Thendifferent variables were analyzed.Results: Results revealed that vertical canine overlap, position of maxillary canine and 1st molar mesiobuccal cusp tipto the center of opposing embrasure/groove, and arch form analysis had significant difference between groups.Adding to that, some of the maxillary and mandibular teeth were significantly differed between groups in regard tocrown angulation and inclination.Conclusions: It was concluded that the vertical canine overlap, position of maxillary canine and 1st molarmesiobuccal cusp tip to the center of the opposing embrasure/groove, arch form harmony were importantfunctional aspects of orthodontic treatment goals


Article
A Clinical Method for Prediction of Alveolar Bone Mineral Density in the Area between the Second Premolar and First Molar in Iraqi Adults with Class I Occlusion

Authors: Maha Ali Hasan Al-Juboori مها علي حسن الجبوري --- Hadeel A. Al-Hashimi
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2015 Volume: 27 Issue: 4 Pages: 161-167
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Orthodontic mini-implants are increasingly used in orthodontics and the bone density is a veryimportant factor in stabilization and success of mini-implant. The aim of this study was to observe the relationshipamong maximum bite force (MBF); body mass index (BMI); face width, height and type; and bone density in anattempt to predict bone density from these variables to eliminate the need for CT scan which have a highly hazardon patient.Materials and Methods: Computed tomographic (CT) images were obtained for 70 patients (24 males and 46females) with age range 18-30 years. The maxillary and mandibular buccal cortical and cancellous bone densitieswere measured between 2nd premolar and 1st molar at two levels from the alveolar crest (3 and 6 mm). Face heightand width were measured from CT. Clinically; Maximum bite force was measured on first molar region unilaterally bya digital device. The sample was divided into two groups according to the body mass index into; normal andoverweight.Results: The results obtained showed that there were no statistical significant differences in MBF or bone density inboth genders. Only the cortical bone density in maxilla in overweight group tended to be higher than normal BMIgroup. The face width and height correlated significantly negatively with MBF which correlated significantly positivelywith cortical bone density.Conclusions: It was concluded that a prediction of cortical bone density of preselected areas can be made frommaximum bite force, body mass index and inter-zygomatic width

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