Zohreh Hedayati; Abdolaziz Haghnegahdar; Ashkan Bagheri
Abstract
Background and Aim: Age estimation may be needed to plan treatment procedures in pedodontic, and orthodontics. Third molar is the last and most variable tooth to develop and may be used for age estimation in adulthood. The purpose of this study was to investigate relationship between chronological age ...
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Background and Aim: Age estimation may be needed to plan treatment procedures in pedodontic, and orthodontics. Third molar is the last and most variable tooth to develop and may be used for age estimation in adulthood. The purpose of this study was to investigate relationship between chronological age and developmental stages of the mandibular third molar in a population of south Iran.Method: The Demirjian’s classification system was used to evaluate the developmental status of the mandibular third molars on the 500 panoramic radiographs of orthodontic patients. The age range of patients was 12 to 20 years. Mean and Standard deviations of Chronological age for each developmental stages were calculated. One-way ANOVA and post-hoc Tuckey HSD test were used to compare the mean age and developmental stages of molar teeth. The age differences in the developmental stages between the genders was assessed. Correlation between calcification stages of the third molars and age was determined.Results: Crown calcification was completed at the mean age of 13.8 years, and root formation without apex closure was observed at the mean age of 17.5 years. At a mean age of 18.4 years apex closure was occurred. Males were advanced in the most of stages of calcification. A strong correlation between developmental stages of the lower third molars and chronological age was found in both genders.Conclusion: The present investigation could provide reference data for third molar development in our population. Developmental stages of mandibular third molars showed a strong correlation with age. The lower third molars developed earlier in males than females.
Javad Chalipa
Abstract
Aim: The goal of this research was examination of agreement between analysis of Hand wrist bones and cervical vertebrae to determine the skeletal age and patient’s growth value in 8-18 years of Iranian children referred to the department of orthodontics, faculty of Dentristy, Tehran University ...
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Aim: The goal of this research was examination of agreement between analysis of Hand wrist bones and cervical vertebrae to determine the skeletal age and patient’s growth value in 8-18 years of Iranian children referred to the department of orthodontics, faculty of Dentristy, Tehran University of Medical Sciences. Materials and Methods: A group of 123 subjects, in accordance with specific treatment design for these patients, performed right hand wrist and lateral cephalograms. Bones evolutionary stages of hand wrist examined based on Grave & Browns and Bjork methods in 9 phase and in 7 regions of hand and wrist. Evolutionary stages of cervical vertebrae determined based on Baccetti method by using from sight or aspect trunk of 2,3,4 vertabrae in 5 phase. These analyses repeated 6 month later. . Kappa Correlation index used for comparison of two used method in order to determine stage of skeletal maturity in general sample.Results: and Conclusion: correlation value in these two methods was weak to determine the skeletal age by analysis of Hand wrist radiography and cervical vertebrae. These cannot be considered as the alternate to determine skeletal age and growth peak with each other.
