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Predictors of favorable soft tissue profile outcomes following Class II Twin-block treatment

OBJECTIVE: The aim of this study was to determine cephalometric factors that help predict favorable soft-tissue profile outcomes following treatment with the Class II Twin-block appliance. METHODS: Pre- and post-treatment lateral cephalograms of 45 patients treated with the Class II Twin-block appli...

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Autores principales: Kim, Ji-Eun, Mah, Su-Jung, Kim, Tae-Woo, Kim, Su-Jung, Park, Ki-Ho, Kang, Yoon-Goo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Korean Association of Orthodontists 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5702773/
https://www.ncbi.nlm.nih.gov/pubmed/29291184
http://dx.doi.org/10.4041/kjod.2018.48.1.11
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author Kim, Ji-Eun
Mah, Su-Jung
Kim, Tae-Woo
Kim, Su-Jung
Park, Ki-Ho
Kang, Yoon-Goo
author_facet Kim, Ji-Eun
Mah, Su-Jung
Kim, Tae-Woo
Kim, Su-Jung
Park, Ki-Ho
Kang, Yoon-Goo
author_sort Kim, Ji-Eun
collection PubMed
description OBJECTIVE: The aim of this study was to determine cephalometric factors that help predict favorable soft-tissue profile outcomes following treatment with the Class II Twin-block appliance. METHODS: Pre- and post-treatment lateral cephalograms of 45 patients treated with the Class II Twin-block appliance were retrospectively analyzed. Profile silhouettes were drawn from the cephalograms and evaluated by three orthodontists in order to determine the extent of improvement. Samples were divided into a favorable group (upper 30% of visual analogue scale [VAS] scores, n = 14) and an unfavorable group (lower 30% of VAS scores, n = 14). Skeletal and soft-tissue measurements were performed on the cephalograms and an intergroup comparison was conducted. RESULTS: An independent t-test revealed that the following pre-treatment values were lower in the favorable group compared to the unfavorable group: lower incisor to mandibular plane angle, lower incisor to pogonion distance, point A-nasion-point B angle, sella-nasion line (SN) to maxillary plane angle, SN to mandibular plane angle, gonial angle, and symphysis inclination. The favorable group had a larger incisor inclination to occlusal plane. Moreover, the favorable group showed larger post-treatment changes in gonial angle, B point projection, and pogonion projection than did the unfavorable group. CONCLUSIONS: Class II malocclusion patients with a low divergent skeletal pattern and reduced lower incisor protrusions are likely to show more improvement in soft-tissue profile outcomes following Class II Twin-block treatment.
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spelling pubmed-57027732018-01-01 Predictors of favorable soft tissue profile outcomes following Class II Twin-block treatment Kim, Ji-Eun Mah, Su-Jung Kim, Tae-Woo Kim, Su-Jung Park, Ki-Ho Kang, Yoon-Goo Korean J Orthod Original Article OBJECTIVE: The aim of this study was to determine cephalometric factors that help predict favorable soft-tissue profile outcomes following treatment with the Class II Twin-block appliance. METHODS: Pre- and post-treatment lateral cephalograms of 45 patients treated with the Class II Twin-block appliance were retrospectively analyzed. Profile silhouettes were drawn from the cephalograms and evaluated by three orthodontists in order to determine the extent of improvement. Samples were divided into a favorable group (upper 30% of visual analogue scale [VAS] scores, n = 14) and an unfavorable group (lower 30% of VAS scores, n = 14). Skeletal and soft-tissue measurements were performed on the cephalograms and an intergroup comparison was conducted. RESULTS: An independent t-test revealed that the following pre-treatment values were lower in the favorable group compared to the unfavorable group: lower incisor to mandibular plane angle, lower incisor to pogonion distance, point A-nasion-point B angle, sella-nasion line (SN) to maxillary plane angle, SN to mandibular plane angle, gonial angle, and symphysis inclination. The favorable group had a larger incisor inclination to occlusal plane. Moreover, the favorable group showed larger post-treatment changes in gonial angle, B point projection, and pogonion projection than did the unfavorable group. CONCLUSIONS: Class II malocclusion patients with a low divergent skeletal pattern and reduced lower incisor protrusions are likely to show more improvement in soft-tissue profile outcomes following Class II Twin-block treatment. Korean Association of Orthodontists 2018-01 2017-11-19 /pmc/articles/PMC5702773/ /pubmed/29291184 http://dx.doi.org/10.4041/kjod.2018.48.1.11 Text en © 2018 The Korean Association of Orthodontists. http://creativecommons.org/licenses/by-nc/4.0/ This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
spellingShingle Original Article
Kim, Ji-Eun
Mah, Su-Jung
Kim, Tae-Woo
Kim, Su-Jung
Park, Ki-Ho
Kang, Yoon-Goo
Predictors of favorable soft tissue profile outcomes following Class II Twin-block treatment
title Predictors of favorable soft tissue profile outcomes following Class II Twin-block treatment
title_full Predictors of favorable soft tissue profile outcomes following Class II Twin-block treatment
title_fullStr Predictors of favorable soft tissue profile outcomes following Class II Twin-block treatment
title_full_unstemmed Predictors of favorable soft tissue profile outcomes following Class II Twin-block treatment
title_short Predictors of favorable soft tissue profile outcomes following Class II Twin-block treatment
title_sort predictors of favorable soft tissue profile outcomes following class ii twin-block treatment
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5702773/
https://www.ncbi.nlm.nih.gov/pubmed/29291184
http://dx.doi.org/10.4041/kjod.2018.48.1.11
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