Morphometric analysis of mandibular growth in skeletal Class III malocclusion

Jenny Zwei Chieng Chang, Yi Jane Chen, Frank Hsin Fu Chang, Jane Chung Chen Yao, Pao Hsin Liu, Chih-Han Chang, Wan Hong Lan

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Background: The craniofacial growth patterns of untreated individuals with skeletal Class III malocclusion have rarely been systemically investigated. This study used morphometric techniques to investigate the growth characteristics of the mandible in individuals with skeletal Class III malocclusion. Methods: Lateral cephalometric head films of 29 4 individuals with untreated skeletal Class III malocclusion (134 males, 160 females) were selected and divided into five triennial age groups (T1-T5) and by gender to identify the morphologic characteristics and sexual dimorphism in changes of mandibular growth. Procrustes, thin-plate spline, and finite element analyses were performed for localization of differences in shape and size changes. Maximum and minimum principal axes were drawn to express the directions of shape changes. Results: From T1 (age 6-8 years) to T4 (age 15-17 years), the distribution of localized size and shape changes of the mandible was very similar between the two genders. From T1 to T2 (age 9-11 years), significant lengthening of the condylar region was noted (23.4-39.7%). From T2 to T3 (age 12-14 years), the greatest size and shape change occurred at the condylar head (27.4-34.9%). From T3 to T4, the greatest size and shape changes occurred in the symphyseal region (23.6-42.1%). From T4 to T5 (age ≥ 18 years), significant sexual dimorphism was found in the distribution and amount of localized size and shape changes. Females displayed little growth increments during T4. Despite differences in the remodeling process, the whole mandibular configurations of both genders exhibited similarly significant upward and forward deformation from T4 to T5. Conclusion: We conclude that thi n-plate spline analysis and the finite element morphometric method are efficient for the localization and quantification of size and shape changes that occur during mandibular growth. Plots of maximum and minimum principal directions can provide useful information about the trends of growth changes.

Original languageEnglish
Pages (from-to)318-328
Number of pages11
JournalJournal of the Formosan Medical Association
Volume105
Issue number4
DOIs
Publication statusPublished - 2006 Jan 1

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Malocclusion
Growth
Finite Element Analysis
Mandible
Sex Characteristics
Cephalometry
Motion Pictures
Age Groups
Head

All Science Journal Classification (ASJC) codes

  • Medicine(all)

Cite this

Chang, Jenny Zwei Chieng ; Chen, Yi Jane ; Chang, Frank Hsin Fu ; Yao, Jane Chung Chen ; Liu, Pao Hsin ; Chang, Chih-Han ; Lan, Wan Hong. / Morphometric analysis of mandibular growth in skeletal Class III malocclusion. In: Journal of the Formosan Medical Association. 2006 ; Vol. 105, No. 4. pp. 318-328.
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abstract = "Background: The craniofacial growth patterns of untreated individuals with skeletal Class III malocclusion have rarely been systemically investigated. This study used morphometric techniques to investigate the growth characteristics of the mandible in individuals with skeletal Class III malocclusion. Methods: Lateral cephalometric head films of 29 4 individuals with untreated skeletal Class III malocclusion (134 males, 160 females) were selected and divided into five triennial age groups (T1-T5) and by gender to identify the morphologic characteristics and sexual dimorphism in changes of mandibular growth. Procrustes, thin-plate spline, and finite element analyses were performed for localization of differences in shape and size changes. Maximum and minimum principal axes were drawn to express the directions of shape changes. Results: From T1 (age 6-8 years) to T4 (age 15-17 years), the distribution of localized size and shape changes of the mandible was very similar between the two genders. From T1 to T2 (age 9-11 years), significant lengthening of the condylar region was noted (23.4-39.7{\%}). From T2 to T3 (age 12-14 years), the greatest size and shape change occurred at the condylar head (27.4-34.9{\%}). From T3 to T4, the greatest size and shape changes occurred in the symphyseal region (23.6-42.1{\%}). From T4 to T5 (age ≥ 18 years), significant sexual dimorphism was found in the distribution and amount of localized size and shape changes. Females displayed little growth increments during T4. Despite differences in the remodeling process, the whole mandibular configurations of both genders exhibited similarly significant upward and forward deformation from T4 to T5. Conclusion: We conclude that thi n-plate spline analysis and the finite element morphometric method are efficient for the localization and quantification of size and shape changes that occur during mandibular growth. Plots of maximum and minimum principal directions can provide useful information about the trends of growth changes.",
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Morphometric analysis of mandibular growth in skeletal Class III malocclusion. / Chang, Jenny Zwei Chieng; Chen, Yi Jane; Chang, Frank Hsin Fu; Yao, Jane Chung Chen; Liu, Pao Hsin; Chang, Chih-Han; Lan, Wan Hong.

In: Journal of the Formosan Medical Association, Vol. 105, No. 4, 01.01.2006, p. 318-328.

Research output: Contribution to journalArticle

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AU - Chang, Jenny Zwei Chieng

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AU - Chang, Frank Hsin Fu

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AB - Background: The craniofacial growth patterns of untreated individuals with skeletal Class III malocclusion have rarely been systemically investigated. This study used morphometric techniques to investigate the growth characteristics of the mandible in individuals with skeletal Class III malocclusion. Methods: Lateral cephalometric head films of 29 4 individuals with untreated skeletal Class III malocclusion (134 males, 160 females) were selected and divided into five triennial age groups (T1-T5) and by gender to identify the morphologic characteristics and sexual dimorphism in changes of mandibular growth. Procrustes, thin-plate spline, and finite element analyses were performed for localization of differences in shape and size changes. Maximum and minimum principal axes were drawn to express the directions of shape changes. Results: From T1 (age 6-8 years) to T4 (age 15-17 years), the distribution of localized size and shape changes of the mandible was very similar between the two genders. From T1 to T2 (age 9-11 years), significant lengthening of the condylar region was noted (23.4-39.7%). From T2 to T3 (age 12-14 years), the greatest size and shape change occurred at the condylar head (27.4-34.9%). From T3 to T4, the greatest size and shape changes occurred in the symphyseal region (23.6-42.1%). From T4 to T5 (age ≥ 18 years), significant sexual dimorphism was found in the distribution and amount of localized size and shape changes. Females displayed little growth increments during T4. Despite differences in the remodeling process, the whole mandibular configurations of both genders exhibited similarly significant upward and forward deformation from T4 to T5. Conclusion: We conclude that thi n-plate spline analysis and the finite element morphometric method are efficient for the localization and quantification of size and shape changes that occur during mandibular growth. Plots of maximum and minimum principal directions can provide useful information about the trends of growth changes.

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