Subbarao Vummidisetti V, Regalla Ravindra Reddy, Santi V, Anita G, Kattimani Vivekanand S
Reader, Department of Conservative Dentistry and Endodontics, Lenora Institute of Dental Sciences, Rajamundry, Andhra Pradesh, India.
Professor and Head, Department of Orthodontics and Dentofacial Orthopedics, Rajiv Gandhi Institute of Medical Sciences, Adilabad, Andhra Pradesh India.
J Contemp Dent Pract. 2014 Jan 1;15(1):103-7. doi: 10.5005/jp-journals-10024-1196.
Orthodontists have several methods to detect inter arch-tooth size discrepancies in patients presenting for orthodontic treatment. Many methods such as Pont's analysis, Nance and Carey's analysis, Peck and Peck ratio, Bolton's analysis are commonly used methods. A thorough search of literature reveals a paucity of reliable data on the mesiodistal dimensions of the crowns of the permanent dentition of Indian population. Without information about the size of individual tooth and groups of teeth for Indian population, it is difficult for the clinician to make an adequate diagnosis and treatment plan and to carry out a plan of therapy.
To determine the size of individual permanent tooth and the sex differences, with tooth size ratios according to Bolton's formula and to evaluate the reliability of Bolton's norms (Anterior/ Posterior) in Indian population.
One hundred and twenty cases in which an excellent occlusion was naturally existent with the mean age of 22 years (18-27 years) were selected in the study. The casts were prepared after taking alginate impression of maxillary and mandibular arches and pouring them immediately with dental stone. A sliding Digital Vernier calliper used to measure the teeth. The ratios of the mean of mesiodistal dimensions of types of teeth were computed.
The mean overall ratio for the Indian population is found to be 92.11 with a standard deviation of 2.12. The values ranged from 86.50-97.13 and the median is 92.16. The mean anterior ratio for the Indian population is found to be 78.14 with a standard deviation of 2.59.
Bolton's original data does not represent Indian population. In our study greater size variability was found in maxillary teeth as compared with mandibular teeth except mandibular first molar. Our study indicated that population-specific standards are necessary for clinical assessments. Significant differences were shown for the overall ratio and anterior ratio for both sexes as compared to Bolton's ratio.
正畸医生有多种方法来检测正畸治疗患者的牙弓间牙齿大小差异。许多方法如庞特分析法、南斯和凯里分析法、佩克和佩克比率法、博尔顿分析法都是常用方法。对文献进行全面检索后发现，关于印度人群恒牙牙冠近远中尺寸的可靠数据很少。由于缺乏印度人群个体牙齿和牙齿组大小的信息，临床医生很难做出充分的诊断和治疗计划，也难以实施治疗方案。
根据博尔顿公式确定个体恒牙的大小、性别差异以及牙齿大小比率，并评估博尔顿标准（前后牙比率）在印度人群中的可靠性。
本研究选取了120例自然存在良好咬合关系、平均年龄22岁（18 - 27岁）的病例。在对上颌和下颌牙弓取藻酸盐印模并立即用牙科石膏灌注后制作模型。使用滑动式数字游标卡尺测量牙齿。计算各类牙齿近远中尺寸平均值的比率。
印度人群的平均总体比率为92.11，标准差为2.12。数值范围为86.50 - 97.13，中位数为92.16。印度人群的平均前牙比率为78.14，标准差为2.59。
博尔顿的原始数据不能代表印度人群。在我们的研究中，除下颌第一磨牙外，上颌牙齿的大小变异性比下颌牙齿更大。我们的研究表明，临床评估需要特定人群的标准。与博尔顿比率相比，男女的总体比率和前牙比率均显示出显著差异。
