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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


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.

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