Gupta Mohit, Divyashree R, Abhilash Pr, A Bijle Mohammed Nadeem, Murali Kv
Department of Orthodontics, New Horizon Dental College, Bilaspur, Chhattisgarh, India.
J Int Oral Health. 2013 Feb;5(1):16-22. Epub 2013 Feb 26.
Chronological age, dental development, height and weight measurements, sexual maturation characteristics and skeletal age are some biological indicators that have been used to identify time of growth. Many researchers have agreed that skeletal maturity is closely related to the craniofacial growth, and bones of hand and wrist are reliable parameters in assessing it. The complete hand and wrist radiograph involves 30 bones and assessment of these bones is one elaborate task. The present study is therefore, undertaken to assess the correlation between the chronological age, dental age and skeletal ages among different types of twins.
The study consisted of 60 subjects (30 twins) aged 8 to 16 years, divided into group of 10 monozygotic, 10 dizygotic and 10 mixed sex twins. The sample was selected from Twin Survey- 2008 conducted by Department of Orthodontics and Dentofacial Orthopaedics, Sree Balaji Dental College and Hospital, Chennai. Their zygosity was determined by sex, blood groups and by the parent. The chronological age was measured by the date of birth given by the parents. Panoramic and hand wrist x-rays were taken. Dental age was assessed by Demerjian et al method and skeletal age by Greulich and Pyle method. The correlation among twins in dental and skeletal ages with the chronological age was assessed using Correlation Coefficient and Student's't' Test.
The obtained data was fed into the computer and statistical analysis was done for the same using the SPSS version 10.0. Statistical significance was tested at P<0.05 level. Mean and Standard Deviation, Correlation Coefficient, Student's't' Test statistical methods were employed. The result showed highly significant 'p' value as <0.001 in all the correlations except for mixed pairs. Descriptive statistics in most of the areas demonstrated a non-significant result between zygosity groups.
There is a correlation existing between the individual's chronological age, dental age and skeletal age and correlation also exists in the twin pairs of the same zygosity and among each pair but no correlation exists between different zygotic twins. How to cite this article: Gupta M, Divyashree R, Abhilash P R, Bijle M N A, Murali K V. Correlation between Chronological Age, Dental Age and Skeletal Age among Monozygoyic and Dizygotic Twins. J Int Oral Health 2013; 3(1):16-22.
实足年龄、牙齿发育、身高和体重测量、性成熟特征以及骨骼年龄是一些已被用于确定生长时间的生物学指标。许多研究人员一致认为，骨骼成熟与颅面生长密切相关，而手部和腕部骨骼是评估骨骼成熟的可靠参数。完整的手部和腕部X光片包含30块骨骼，对这些骨骼进行评估是一项复杂的任务。因此，本研究旨在评估不同类型双胞胎的实足年龄、牙齿年龄和骨骼年龄之间的相关性。
本研究包括60名年龄在8至16岁之间的受试者（30对双胞胎），分为10对同卵双胞胎、10对异卵双胞胎和10对混合性别双胞胎。样本选自金奈Sree Balaji牙科学院和医院正畸与牙颌面正畸科进行的2008年双胞胎调查。通过性别、血型和父母来确定他们的合子性。实足年龄通过父母提供的出生日期来测量。拍摄全景和手部腕部X光片。牙齿年龄采用德梅尔坚等人的方法进行评估，骨骼年龄采用格罗利希和派尔的方法进行评估。使用相关系数和学生t检验评估双胞胎的牙齿年龄和骨骼年龄与实足年龄之间的相关性。
将获得的数据输入计算机，并使用SPSS 10.0版本对其进行统计分析。在P<0.05水平上检验统计学显著性。采用均值和标准差、相关系数、学生t检验等统计方法。结果显示，除混合对之外，所有相关性中的“p”值均极显著，<0.001。大多数领域的描述性统计表明，合子性组之间的结果无显著性差异。
个体的实足年龄、牙齿年龄和骨骼年龄之间存在相关性，同合子性的双胞胎对之间以及每对双胞胎之间也存在相关性，但不同合子性的双胞胎之间不存在相关性。如何引用本文：Gupta M, Divyashree R, Abhilash P R, Bijle M N A, Murali K V. 同卵和异卵双胞胎的实足年龄、牙齿年龄和骨骼年龄之间的相关性。《国际口腔健康杂志》2013年；3(1):16 - 22。
