Journal of Contemporary Dentistry

Register      Login

VOLUME 7 , ISSUE 2 ( May-August, 2017 ) > List of Articles

ORIGINAL RESEARCH

Effect of Bi-jaw Premolar Extractions on Tooth Size Discrepancy in an Indian Population having Class I Malocclusion: An in vitro Study

Manish Sonawane, Ravindranath V Krishnan, Girish R Karandikar, Samay Tahilramani

Citation Information : Sonawane M, Krishnan RV, Karandikar GR, Tahilramani S. Effect of Bi-jaw Premolar Extractions on Tooth Size Discrepancy in an Indian Population having Class I Malocclusion: An in vitro Study. J Contemp Dent 2017; 7 (2):114-117.

DOI: 10.5005/jp-journals-10031-1196

License: CC BY 3.0

Published Online: 01-06-2014

Copyright Statement:  Copyright © 2017; The Author(s).


Abstract

Aim

To evaluate the effect of bi-jaw premolar extractions on Bolton tooth size discrepancy in patients of Indian origin, all of which exhibited a bilateral Angle’s class I molar relationship.

Materials and methods

Ninety sets of pretreatment study casts, which constituted the sample for the study, were divided into three groups, namely, Bolton small (BS), Bolton normal (BN), and Bolton big (BB). Simulated bi-jaw extraction of premolars was carried out in four different combinations for each set of study cast. The four values of Bolton’s overall ratio (BOR) thus obtained were compared with the original BOR value.

Results

The BOR value reduced when subjected to any of the four combinations of bi-jaw premolar extractions.

Conclusion

Premolar extraction in any combination inevitably changes the BOR value, which potentially affects the settling of occlusion toward the finishing stages of orthodontic treatment.

Clinical significance

The present study provides an insight into the choice of bi-jaw premolar extraction combination for each of the three groups in patients exhibiting class I malocclusion in the Indian population.

How to cite this article

Tahilramani S, Karandikar GR, Krishnan RV, Sonawane M. Effect of Bi-jaw Premolar Extractions on Tooth Size Discrepancy in an Indian Population having Class I Malocclusion: An in vitro Study. J Contemp Dent 2017;7(2):114-117.


HTML PDF Share
  1. Disharmony in tooth size and its relation to analysis in treatment of malocclusion. Angle Orthod 1958;28:113-130.
  2. The clinical application of a tooth size analysis. Am J Orthod 1962 Jul;48(7):504-529.
  3. The effect of premolar extractions on tooth size discrepancies. Angle Orthod 2004 Aug;74(4):508-511.
  4. The effect of premolar extraction models on Bolton overall ratio among different classes of malocclusion. Hua Xi Kou Qiang Yi Xue Za ZhI 2012 Apr;30(2):176-182.
  5. Tooth-size discrepancies among different occlusion groups of southern Chinese children. Am J Orthod Dentofacial Orthop 2001 Nov;120(5):556-558.
  6. Asymmetry in tooth sizes: a factor in the etiology, diagnosis and treatment of malocclusion. Angle Orthod 1944 Jul;14(3):67-70.
  7. Variation of tooth position. Svensk Tandiak Tidskr 1946;39:50-51.
  8. Descriptive anatomy of the human teeth. 4th ed. Philadelphia (PA): S. S. White Dental Mfg. Co.; 1902.
  9. A study of Pont’s, Howes’, Rees’s, Neff’s and Bolton’s analyses on Class I adult dentitions. Angle Orthod 1958 Oct;28(4):215-225.
  10. Comparison of intermaxillary tooth size discrepancies among different malocclusion groups. Am J Orthod Dentofacial Orthop1999 Nov;116(5):539-544.
  11. Sex difference in tooth size. J Dent Res 1964 Mar-Apr;43(2):306.
  12. The effect of premolar extractions on tooth-size discrepancy. Am J Orthod Dentofacial Orthop 1997 Apr;111(4):428-434.
PDF Share
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.