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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
The Effect of Insertion Angle on Primary Stability of Orthodontic Mini-implants "An Experimental in vivo Study"

Author: Saba H Al–Zubaidi
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 22 Pages: 327-332
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To determine whether obliquely inserted mini-implants can be loaded immediately with light orthodontic force? And which mini-implants are more stable those with 90 degree or 60 degree insertion angles? Materials and Methods: three rabbits were used in this study. Sixteen mini-implants divided into 2 groups equally. The first group implanted in the rabbit’s tibia bone at 90 degree insertion angle and the second group implanted in the rabbit’s tibia bone at 60 degree insertion angle. The stability of mini-implants was measured using periotest device immediately before and after loading and after 2 weeks of loading period. The data were analyzed using descriptive statistic, Analysis of variance (ANOVA), Duncan Multiple analysis range test and student t-test. Result: mini-implants at 60 degree insertion angle can be loaded immediately with light orthodontic force. Also, those miniimplants having a significant greater stability before loading and after two weeks of loading period in comparison with mini-implants implanted at 90 degree angle. Conclusions: In clinical practice, miniimplants inclined to the bone surface at 60degree tend to have better primary stability and can be loaded immediately.


Article
Effect of smoking on hard palate bone density
تأثير التدخين على كثافة عظم الحنك الصلب

Author: Zahraa M. Al- Fadily
Journal: journal of kerbala university مجلة جامعة كربلاء ISSN: 18130410 Year: 2016 Volume: 14 Issue: 1 Pages: 112-119
Publisher: Kerbala University جامعة كربلاء

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Abstract

Background: The bone density of hard palate is key factor for success of palatal mini-implant. Smoking is an important determinant of osteoporosis.Materials and method: Sixty males were selected with age range 20-39 years and divided into two groups according to smoking; smokers group (30), and nonsmokers (control) group (30). The measurements of hard palate bone density by HU (unit used to measure radiodensity of bone on CT scan) were made at 20 sites at the intersection of five anterioposterior and four mediolateral reference lines using Philips, Brilliancetm, 64-multislice computed tomography scanner software.Results: The results that were obtained showed that there was a statistically significant difference between the two groups in bone density at most areas of hard palate. The comparison between the two groups in the overall cortical bone density showed a highly statistically significant difference. The comparison between the two groups in the overall cancellous bone density showed a statistically significant difference.Conclusion: Hard palate bone density decreased by smoking. In spite that, orthodontic mini-implants can be safely used for smoker persons in hard palate.

الخلفية: كثافة عظم الحنك الصلب عامل مهم لنجاح الزرعات التقويمية الحنكية. التدخين مسبب رئيسي لهشاشة العظام.المواد والادوات: شملت العينة 60 ذكر تتراوح أعمارهم بين٢٠- 3٩ سنة. قسمت العينة الى مجموعتين, المدخنين (30) وغير المدخنين (30). كثافة عظم الحنك الصلب قيست ل٢٠ موقع عند تقاطع خمس خطوط إشارة أمامية خلفية مع أربع خطوط إشارة قريبة بأستخدام برامجيات المفراس الحلزوني ٦٤- متعدد المقاطع لشركة فلبس المتألقة. النتائج: النتائج أظهرت أن هنالك فروق ذات دلالة إحصائية في كثافة عظم الحنك الصلب بين المدخنين وغير المدخنين في معظم المناطق. مقارنة كثافة العظم القشري الكلية بين المجموعتين بينت فروق ذات دلالة إحصائية عالية . مقارنة كثافة العظم الإسفنجي الكلية بين المجموعتين بينت فروق ذات دلالة إحصائية. الاستنتاج: كثافة عظم الحنك الصلب تتناقص بالتدخين. بالرغم من ذلك, الزرعات التقويمية من الممكن وضعها للمدخنين في عظم الحنك الصلب.


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


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

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