Journal of Postgraduate Medicine, Education and Research

Register      Login

VOLUME 51 , ISSUE 1 ( January-March, 2017 ) > List of Articles

RESEARCH ARTICLE

Assessment of Vertical Skeletal Patterns using a New Cephalometric Parameter: The Dhaval—Rohan Angle

Dhaval Ranjitbhai Lekhadia, Rohan Rai, Niveditha Hegde, Abhinay Sorake

Citation Information : Lekhadia DR, Rai R, Hegde N, Sorake A. Assessment of Vertical Skeletal Patterns using a New Cephalometric Parameter: The Dhaval—Rohan Angle. J Postgrad Med Edu Res 2017; 51 (1):7-11.

DOI: 10.5005/JPMER-51-1-7

Published Online: 00-03-2017

Copyright Statement:  Copyright © 2017; Jaypee Brothers Medical Publishers (P) Ltd.


Abstract

Introduction

The aim of this study was to establish a new cephalometric parameter, named the Dhaval—Rohan angle (DR), to assess the vertical skeletal patterns on a lateral cephalogram with accuracy and reproducibility.

Materials and methods

One hundred and twenty pretreatment lateral cephalograms of the patients visiting the department of orthodontics and dentofacial orthopedics for treatment were obtained and divided into three groups. i.e., horizontal growth pattern, average growth pattern, and vertical growth pattern cases based on the routinely used cephalometric parameters; FMA, SN-GoGn, Y-axis angle and Jarabak ratio. This angle uses three skeletal landmarks, the point C (center of the condyle), point M (midpoint of premaxilla), and point G (center of the largest circle that is tangent to the internal inferior, anterior, and posterior surfaces of the mandibular symphysis).

Results

The one-way analysis of variance (ANOVA) test showed that the three groups studied were not the same for DR angle and the post hoc Tukey test found the groups to be significantly different. According to the Student's t-test, there was no statistically significant difference in mean values of DR angle between males and females.

Conclusion

Cephalometric evaluation of young adults shows that the DR angle below 28.5° indicates a horizontal growth pattern, between 28.5 and 32.5° indicate an average growth pattern and above 32.5° indicate a vertical growth pattern.

How to cite this article

Lekhadia DR, Rai R, Hegde N, Hegde G, Sorake A, Kumar A. Assessment of Vertical Skeletal Patterns using a New Cephalometric Parameter: The Dhaval—Rohan Angle. J Postgrad Med Edu Res 2017;51(1):7-11.


PDF Share
  1. A new view of the control of the morphogenesis of the skull. Acta Morphol Neerl Scand 1970 Nov;8(2):143-160.
  2. The role of genetic and local environmental factors in the control of postnatal craniofacial morphogenesis. Acta Morphol Neerl Scand 1972 Oct;10(1):37-47.
  3. A classification of skeletal facial types. Am J Orthod 1969 Feb;55(2):109-123.
  4. The Frankfort mandibular plane angle in orthodontic diagnosis, classification, treatment planning and prognosis. Am J Orthod Oral Sur 1946 Apr;32:175-230.
  5. Cephalometrics for you and me. Am J Orthod 1953;39:729-755.
  6. Variations in facial relationships, their significance in analysis and treatment planning. Am J Orthod 1948 Oct;34(10):812-840.
  7. A method of cephalometric evaluation. Am J Orthod 1984 Dec;86(6):449-469.
  8. Technique and treatment with light-wire edgewise appliances, 2nd ed. Saint Louis, MO:CV Mosby Co; 1972:277-379.
  9. Reliability of the existing vertical dysplasia indicators in assessing a definitive Growth Pattern. Am J Orthod 2011Dec16:1-5.
  10. A new parameter for assessing vertical skeletal discrepancies: The R angle. Am J Orthod 2013 Jun16:1-7.
  11. Cephalomteric assessment of sagittal relationships between maxilla and mandible. Am J Orthod Dentofacial Orthop 1994 Apr;105(4):328-344.
  12. A new sagittal dysplasia indicator: the yen angle. World J Orthod 2009 Summer;10(2):147-151.
  13. A new approach of assessing sagittal dysplasia: the W angle. Eur J Orthod. 2013 Feb;35(1):66-70.
  14. The HBN Angle. J Indian Orthod Soc 2015;49(2):79-84.
  15. C.axis: A growth vector for the maxilla. Angle Orthod 1999 Dec;69(6):539.542.
  16. A new approach of assessing sagittal discrepancies: The beta angle. Am J Orthod Dentofacial Orthop 2004 Jul;126(1):100-105.
  17. The G. Axis: A growth vector for the mandible. Angle Orthod 2004 Jun;74:328.331.
  18. Basic principles of ROC analysis. Semin Nucl Med 1978 Oct;8(4):283-298.
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.