Hegde Sapna, Patodia Akash, Dixit Uma
Department of Paediatric Dentistry, Pacific Dental College and Hospital, Udaipur, Rajasthan, India.
Department of Paediatric Dentistry, Pacific Dental College and Hospital, Udaipur, Rajasthan, India.
Forensic Sci Int. 2016 Dec;269:63-69. doi: 10.1016/j.forsciint.2016.11.009. Epub 2016 Nov 13.
The usefulness of the developmental status of the third molar has been studied in assessment of the chronological age of adolescents in whom the development of the other permanent teeth is nearly complete. However, little is known about the timing and pattern of third-molar development in the Indian population.
This study aimed to stage the third molar development in relation to chronological age of 5-16year old Indian children.
In this cross-sectional observational study, the status of third molar development in relation to chronological age of 1139 Indian children aged 5-16 years was evaluated radiographically, using Orhan's modification of Demirjian's method.
The frequency of occurrence of the third molars varied from 47% to 70%. Crypt formation, crown completion and root completion occurred as early as 5.4, 8.7 and 15.0 years, respectively. No significant differences based on gender or side were observed in third-molar development (p>0.05). For most stages, maxillary third molars were slightly more advanced than their mandibular counterparts (p>0.05).
Considering the high degree of variability observed in third molar genesis and development, the usefulness of this tooth in age determination studies may be very limited in the age group studied.
在评估其他恒牙发育已基本完成的青少年的实际年龄时，已对第三磨牙的发育状态的效用进行了研究。然而，对于印度人群中第三磨牙发育的时间和模式知之甚少。
本研究旨在根据5至16岁印度儿童的实际年龄对第三磨牙发育进行分期。
在这项横断面观察性研究中，采用奥尔汉对德米尔坚方法的改良，通过影像学评估了1139名5至16岁印度儿童的第三磨牙发育状态与实际年龄的关系。
第三磨牙的出现频率在47%至70%之间。牙胚形成、牙冠完成和牙根完成分别最早出现在5.4岁、8.7岁和15.0岁。在第三磨牙发育方面，未观察到基于性别或牙侧的显著差异（p>0.05）。在大多数阶段，上颌第三磨牙比下颌第三磨牙略为超前（p>0.05）。
考虑到在第三磨牙发生和发育过程中观察到的高度变异性，在本研究年龄组中，这颗牙齿在年龄确定研究中的效用可能非常有限。
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