Mohsen Shirazi; Armin Soudi; Pedram Baghaeian; Yasamin Farajzadeh Jalali
Abstract
Background: The aim of this study was to investigate the crystal structure of mineral part in the Compact and Cancellous bones in different areas of alveolar bones.
Methods: In this study, 7 alveolar bone samples were prepared from buccal and distal plates of the jaws of three patients, and 4 samples ...
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Background: The aim of this study was to investigate the crystal structure of mineral part in the Compact and Cancellous bones in different areas of alveolar bones.
Methods: In this study, 7 alveolar bone samples were prepared from buccal and distal plates of the jaws of three patients, and 4 samples from Cortical and Cancellous bone of two other patients' palate. After converting all the samples into powder, the samples were examined by using the X-RD method. Diffractogram of 1-7 samples were compared with each other and Diffractogram of 8-11 samples also were compared with each other too. Results: Comparing two corresponding points in the jaws the crystallinity degree in the mandible is higher than the maxilla. In comparison of two corresponding points in the maxilla and mandible degree of crystallinity and the crystalline hydroxyapatite on the right has been more than on the left. The amount of crystalline hydroxyapatite phase in females is more than males and crystallinity degree of this phase in males is more than females, and in younger people, the hydroxyapatite crystalline phase is more than others and crystallinity of this phase in older subjects is higher than others.
Conclusions: Tooth movement, despite the influence of the same forces, is faster on left side than the right side and is faster on maxilla than mandible. Tooth movement is faster in younger people than in older subjects.
Yasamin Farajzadeh Jalali; Maryam Nasiri; Farnaz Jabbari
Abstract
Background: Achieving esthetics is the most important objective of the modern orthodontics. The introduction of a standard, called the divine proportion for the evaluation of a profile, can lead orthodontic, orthopedic and surgical treatment to obtain maximum facial beauty.
Objectives: The aim of this ...
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Background: Achieving esthetics is the most important objective of the modern orthodontics. The introduction of a standard, called the divine proportion for the evaluation of a profile, can lead orthodontic, orthopedic and surgical treatment to obtain maximum facial beauty.
Objectives: The aim of this study is to analyze the divine proportion in the face of Iranian normal females and the ability of that using as a standard and index to analyze harmony in patient’s face before and after orthodontic treatment along with other common cephalometric analyses.
Patients and Methods: The selected samples included twenty 19 - 26 years old females. Full-face and profile photography and lateral cephalometric radiography were taken; initially the cephalometric radiography were used for conducting common cephalometric analyses in order to compare them with the results gained from the divine proportion measurements. Seven ratios in photography and twelve ratios in radiography calculated. Radiographic and photographic data were analyzed separately using multivariate analysis of variance (MANOVA) and one-sample t-test and compared with 1.618 (golden ratio).
Results: The average values vary from 1.4 to 1.7; the ratio R11 with the average value of 1.613 was the closest value to 1.618. Three cephalometric variables (R3, R8, R12) and two photographic ones (R6 and R7) had a significant difference with 1.618.
Conclusions: The divine proportion on the soft ratio can be a good standard to assess an orthodontic treatment. Divine proportion covers a wide domain and there is a long way ahead of these studies; so it can be extended even more in future.
