<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>The purpose of this investigation was to examine lower arch alignment in the long term following treatment by second molar extraction. Thirty subjects, treated by extraction of four second permanent molars at an average age of 13.9 years, were examined five and ten years after extractions. None had any mechanical treatment in the lower arch. Twenty had some simple upper arch treatment, including, in five cases, extraction of first premolars. The changes in lower arch alignment were measured on study models. There was a small average decrease in lower arch crowding in the first five years following extraction, and little or no change in alignment in the next five years.</p>
</abstract>

The purpose of this investigation was to examine lower arch alignment in the long term following treatment by second molar extraction. Thirty subjects, treated by extraction of four second permanent molars at an average age of 13.9 years, were examined five and ten years after extractions. None had any mechanical treatment in the lower arch. Twenty had some simple upper arch treatment, including, in five cases, extraction of first premolars. The changes in lower arch alignment were measured on study models. There was a small average decrease in lower arch crowding in the first five years following extraction, and little or no change in alignment in the next five years.

Second Permanent Molar Extraction and Late Lower Arch Crowding: A Ten-Year Longitudinal Study

Associate Specialist Orthodontist Department of Orthodontics The Royal Hospitals School of Dentistry Belfast

Australasian Orthodontic Journal

This work is licensed under the Creative Commons Attribution 4.0 International License.

The purpose of this investigation was to examine lower arch alignment in the long term following treatment by second molar extraction. Thirty subjects, treated...

Second Permanent Molar Extraction and Late Lower Arch Crowding: A Ten-Year Longitudinal Study

Published Online: Jan 16, 2024

Page range: 163 - 167

Received: Feb 01, 1996

Accepted: Jun 01, 1996

DOI: https://doi.org/10.2478/aoj-1996-0016

Keywords
second molar extraction, crowding, stability,

© 1996 Margaret E. Richardson, published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Second Permanent Molar Extraction and Late Lower Arch Crowding: A Ten-Year Longitudinal Study

Published Online: Jan 16, 2024

Page range: 163 - 167

Received: Feb 01, 1996

Accepted: Jun 01, 1996

DOI: https://doi.org/10.2478/aoj-1996-0016

Keywordssecond molar extraction, crowding, stability,

© 1996 Margaret E. Richardson, published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Keywords
second molar extraction, crowding, stability,