The Effects of Extraction Versus Nonextraction Orthodontic Treatment on the Growth of the Lower Anterior Face Height

The effect of orthodontic treatment on the lower anterior face height (ANS-Me) is of fundamental importance to the orthodontist. However, the choice between the two main methods of treatment, extraction versus nonextraction, is not clear cut. It is believed that the extraction method decreases ANS-M...

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Main Authors: Chua, Ai-Lian, LIM, Young Sain, Joseph, Lubit, Erwin C.
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Language:English
Published: Institutional Knowledge at Singapore Management University 1993
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Online Access:https://ink.library.smu.edu.sg/lkcsb_research/1136
https://doi.org/10.1016/s0889-5406(05)81334-4
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spelling sg-smu-ink.lkcsb_research-21352010-09-23T06:24:04Z The Effects of Extraction Versus Nonextraction Orthodontic Treatment on the Growth of the Lower Anterior Face Height Chua, Ai-Lian LIM, Young Sain, Joseph Lubit, Erwin C. The effect of orthodontic treatment on the lower anterior face height (ANS-Me) is of fundamental importance to the orthodontist. However, the choice between the two main methods of treatment, extraction versus nonextraction, is not clear cut. It is believed that the extraction method decreases ANS-Me, whereas nonextraction methods result in an increase in ANS-Me. This study examined the effects of both methods on ANS-Me for a sample of 174 subjects divided equally between Class I and II malocclusions. Most studies controlled for growth by using subjects in the same age group. However, we controlled for the effects of growth by normalizing ANS-Me measurements to the Michigan Growth Standard. With this method, we can compare subjects who differ in terms of the age at which treatment was started, as well as subjects whose treatments were of different duration, thereby enlarging the sample size. In addition to growth and duration of treatment, other factors like the effects of treatment choice and treatment mechanics were considered. The results obtained show that nonextraction treatment in Class I and II subjects is associated with a significant increase in the lower anterior face height. However, extraction treatment is not associated with any significant change in ANS-Me. 1993-10-01T07:00:00Z text https://ink.library.smu.edu.sg/lkcsb_research/1136 info:doi/10.1016/s0889-5406(05)81334-4 https://doi.org/10.1016/s0889-5406(05)81334-4 Research Collection Lee Kong Chian School Of Business eng Institutional Knowledge at Singapore Management University Business
institution Singapore Management University
building SMU Libraries
continent Asia
country Singapore
Singapore
content_provider SMU Libraries
collection InK@SMU
language English
topic Business
spellingShingle Business
Chua, Ai-Lian
LIM, Young Sain, Joseph
Lubit, Erwin C.
The Effects of Extraction Versus Nonextraction Orthodontic Treatment on the Growth of the Lower Anterior Face Height
description The effect of orthodontic treatment on the lower anterior face height (ANS-Me) is of fundamental importance to the orthodontist. However, the choice between the two main methods of treatment, extraction versus nonextraction, is not clear cut. It is believed that the extraction method decreases ANS-Me, whereas nonextraction methods result in an increase in ANS-Me. This study examined the effects of both methods on ANS-Me for a sample of 174 subjects divided equally between Class I and II malocclusions. Most studies controlled for growth by using subjects in the same age group. However, we controlled for the effects of growth by normalizing ANS-Me measurements to the Michigan Growth Standard. With this method, we can compare subjects who differ in terms of the age at which treatment was started, as well as subjects whose treatments were of different duration, thereby enlarging the sample size. In addition to growth and duration of treatment, other factors like the effects of treatment choice and treatment mechanics were considered. The results obtained show that nonextraction treatment in Class I and II subjects is associated with a significant increase in the lower anterior face height. However, extraction treatment is not associated with any significant change in ANS-Me.
format text
author Chua, Ai-Lian
LIM, Young Sain, Joseph
Lubit, Erwin C.
author_facet Chua, Ai-Lian
LIM, Young Sain, Joseph
Lubit, Erwin C.
author_sort Chua, Ai-Lian
title The Effects of Extraction Versus Nonextraction Orthodontic Treatment on the Growth of the Lower Anterior Face Height
title_short The Effects of Extraction Versus Nonextraction Orthodontic Treatment on the Growth of the Lower Anterior Face Height
title_full The Effects of Extraction Versus Nonextraction Orthodontic Treatment on the Growth of the Lower Anterior Face Height
title_fullStr The Effects of Extraction Versus Nonextraction Orthodontic Treatment on the Growth of the Lower Anterior Face Height
title_full_unstemmed The Effects of Extraction Versus Nonextraction Orthodontic Treatment on the Growth of the Lower Anterior Face Height
title_sort effects of extraction versus nonextraction orthodontic treatment on the growth of the lower anterior face height
publisher Institutional Knowledge at Singapore Management University
publishDate 1993
url https://ink.library.smu.edu.sg/lkcsb_research/1136
https://doi.org/10.1016/s0889-5406(05)81334-4
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