The Journal of Contemporary Dental Practice

Register      Login



Volume / Issue

Online First

Related articles

VOLUME 14 , ISSUE 2 ( March-April, 2013 ) > List of Articles


Arch Widths after Extraction and Nonextraction Treatment in Class I Patients

Vikranth Shetty, Sangeeta A Golwalkar

Citation Information : Shetty V, Golwalkar SA. Arch Widths after Extraction and Nonextraction Treatment in Class I Patients. J Contemp Dent Pract 2013; 14 (2):312-315.

DOI: 10.5005/jp-journals-10024-1319

Published Online: 01-08-2013

Copyright Statement:  Copyright © 2013; The Author(s).



To compare pretreatment and post-treatment dental arches in relation to intercanine and intermolar width changes in extraction and nonextraction treatment in class I patients.

Materials and methods

In this retrospective study pretreatment and post-treatment dental casts of 60 patients (30 extractions of first premolars and 30 nonextractions) were selected.

Anterior and posterior arch widths in the canine and molar regions from the most labial aspect of buccal surfaces, the canines and the molars were measured with the help of digital caliper on the study models and compared statistically to determine whether the dental arches were narrower after extraction treatment.


At the start of the treatment there were no statistically significant differences in maxillary and mandibular intercanine widths in both groups. At the end of treatment in both the groups anterior and posterior arch width changes were not significant except for the intercanine dimension which was 0.82 mm larger (p < 0.05) in the extraction group.


The extraction treatment does not result in narrower dental arches than nonextraction treatment in intercanine and intermolar region.

Clinical significance

It is documented that the arch widths determine smile esthetics and treatment stability. According to the findings of the present study the arch widths in extraction treatments are not narrower than nonextraction so there will not be any compromising effects on esthetics and treatment stability.

How to cite this article

Golwalkar SA, Shetty V. Arch Widths after Extraction and Nonextraction Treatment in Class I Patients. J Contemp Dent Pract 2013;14(2):312-315.

PDF Share
  1. Treatment of malocclusion of the teeth and fractures of the maxillae, Angles system (6th ed). SS Philadelphia: White Dental Manufacturing Co; 1990;15-23.
  2. Das Gesetz der Transformation der Knochen. Berlin: Hirschwald; 1892. English translation by Springer-Verlag 1896;82-89.
  3. The question of extraction in orthodontia. Am J Orthod Dentofacial Orthop 1964;50:658-69.
  4. Arch width after extraction and nonextraction treatment. Am J Orthod Dentofacial Orthop 2003;123:25-28.
  5. The fallacy of denture expansion. Angle Orthod 1949;19:12-17.
  6. Review of the retention problem. Angle Orthod 1960;6:179-99.
  7. Statistical methods for medical and biological students. London: George Allen and Unwin Ltd 1940:122-32.
  8. Stability and relapse of dental arch alignment. Br J Orthod 1990;17:235-41.
  9. Relapse revisited. Am J Orthod Dentofacial Orthop 1997;111:543-53.
  10. A retrospective study of Angle class I malocclusions treated orthodontically without extractions using two palatal expansion methods. Am J Orthod Dentofacial Orthop 1999;116:101-07.
  11. Nonextraction orthodontic therapy: Post-treatment dental and skeletal stability. Am J Orthod Dentofacial Orthop 1987;92:321-28.
  12. A long-term comparison of nonextraction and premolar extraction edgewise therapy in ‘borderline’ class II patients. Am J Orthod Dentofacial Orthop 1992;102:1-14.
  13. The effects of premolar extraction: A long-term comparison of outcomes in “clear-cut” extraction and nonextraction class II patients. Angle Orthod 1993;63:257-72.
  14. Analysis of change in arch form with premolar expansion. Am J Orthod Dentofacial Orthop 1999;113:307-15.
  15. Long-term stability of dental relationships after orthodontic treatment. Angle Orthod 1983;53:240-52.
  16. Extractions vs nonextraction: Arch widths and smile esthetics. Angle Orthod 2003:73:354-58.
  17. Smile esthetics after orthodontic treatment with and without extractions of four first premolars. Am J Orthod Dentofacial Orthop 1995;108:162-67.
  18. Resolution of mandibular arch crowding in growing patients with class 1 malocclusions treated nonextraction. Am J Dentofacial Orthop 1996;110:359-64.
  19. Maxillary transverse deficiency. Am J Orthod Dentofacial Orthop 2000;117:567-70.
PDF Share
PDF Share

© Jaypee Brothers Medical Publishers (P) LTD.