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Personalized Orthodontics: From the Sagittal Position of Lower Incisors to the Facial Profile Esthetics

Background: One of the goals of orthodontic treatment is to obtain maximum facial harmony. The sagittal position of the lower incisors plays a significant role in the planning of orthodontic treatment. The aim of the study was to evaluate the relationship between the sagittal position of lower incis...

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Autores principales: Derwich, Marcin, Minch, Liwia, Mitus-Kenig, Maria, Zoltowska, Agata, Pawlowska, Elzbieta
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8402232/
https://www.ncbi.nlm.nih.gov/pubmed/34442336
http://dx.doi.org/10.3390/jpm11080692
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author Derwich, Marcin
Minch, Liwia
Mitus-Kenig, Maria
Zoltowska, Agata
Pawlowska, Elzbieta
author_facet Derwich, Marcin
Minch, Liwia
Mitus-Kenig, Maria
Zoltowska, Agata
Pawlowska, Elzbieta
author_sort Derwich, Marcin
collection PubMed
description Background: One of the goals of orthodontic treatment is to obtain maximum facial harmony. The sagittal position of the lower incisors plays a significant role in the planning of orthodontic treatment. The aim of the study was to evaluate the relationship between the sagittal position of lower incisors and facial profile esthetics with reference to the skeletal vertical dimension. Methods: There were 200 patients included in the study. Patients were allocated into three groups, depending on the vertical growth pattern: normal-angle, low-angle, and high-angle cases. Tweed–Merrifield cephalometric analysis was used to assess the sagittal and vertical position of the mandible, as well as to assess the sagittal position of the lower incisors. Results: Z-angle and Frankfort mandibular incisor plane angle (FMIA) decreased significantly (p < 0.001) with the increase of the skeletal vertical dimension. Incisor mandibular plane angle (IMPA) was significantly higher (p < 0.001) in low-angle patients compared to the high-angle ones. Z-angle appeared to be the most accurate parameter (area under curve, AUC = 0.957) describing patients with a convex profile. The cutoff value of Z-angle 68.0° was characterized by the sensitivity of 94.1% and the specificity of 84.3%. Conclusions: The sagittal position of the lower incisors significantly affects the facial profile convexity. The Z-angle is the parameter which most accurately describes the patients with a convex profile.
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spelling pubmed-84022322021-08-29 Personalized Orthodontics: From the Sagittal Position of Lower Incisors to the Facial Profile Esthetics Derwich, Marcin Minch, Liwia Mitus-Kenig, Maria Zoltowska, Agata Pawlowska, Elzbieta J Pers Med Article Background: One of the goals of orthodontic treatment is to obtain maximum facial harmony. The sagittal position of the lower incisors plays a significant role in the planning of orthodontic treatment. The aim of the study was to evaluate the relationship between the sagittal position of lower incisors and facial profile esthetics with reference to the skeletal vertical dimension. Methods: There were 200 patients included in the study. Patients were allocated into three groups, depending on the vertical growth pattern: normal-angle, low-angle, and high-angle cases. Tweed–Merrifield cephalometric analysis was used to assess the sagittal and vertical position of the mandible, as well as to assess the sagittal position of the lower incisors. Results: Z-angle and Frankfort mandibular incisor plane angle (FMIA) decreased significantly (p < 0.001) with the increase of the skeletal vertical dimension. Incisor mandibular plane angle (IMPA) was significantly higher (p < 0.001) in low-angle patients compared to the high-angle ones. Z-angle appeared to be the most accurate parameter (area under curve, AUC = 0.957) describing patients with a convex profile. The cutoff value of Z-angle 68.0° was characterized by the sensitivity of 94.1% and the specificity of 84.3%. Conclusions: The sagittal position of the lower incisors significantly affects the facial profile convexity. The Z-angle is the parameter which most accurately describes the patients with a convex profile. MDPI 2021-07-22 /pmc/articles/PMC8402232/ /pubmed/34442336 http://dx.doi.org/10.3390/jpm11080692 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Derwich, Marcin
Minch, Liwia
Mitus-Kenig, Maria
Zoltowska, Agata
Pawlowska, Elzbieta
Personalized Orthodontics: From the Sagittal Position of Lower Incisors to the Facial Profile Esthetics
title Personalized Orthodontics: From the Sagittal Position of Lower Incisors to the Facial Profile Esthetics
title_full Personalized Orthodontics: From the Sagittal Position of Lower Incisors to the Facial Profile Esthetics
title_fullStr Personalized Orthodontics: From the Sagittal Position of Lower Incisors to the Facial Profile Esthetics
title_full_unstemmed Personalized Orthodontics: From the Sagittal Position of Lower Incisors to the Facial Profile Esthetics
title_short Personalized Orthodontics: From the Sagittal Position of Lower Incisors to the Facial Profile Esthetics
title_sort personalized orthodontics: from the sagittal position of lower incisors to the facial profile esthetics
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8402232/
https://www.ncbi.nlm.nih.gov/pubmed/34442336
http://dx.doi.org/10.3390/jpm11080692
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