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Craniofacial growth and SITAR growth curve analysis


Patcas, Raphael; Keller, Heidi; Markic, Goran; Beit, Philipp; Eliades, Theodore; Cole, Tim J (2022). Craniofacial growth and SITAR growth curve analysis. European Journal of Orthodontics, 44(3):325-331.

Abstract

BACKGROUND
SITAR (SuperImposition by Translation And Rotation) is a shape invariant growth curve model that effectively summarizes somatic growth in puberty.
AIM
To apply the SITAR model to longitudinal mandibular growth data to clarify its suitability to facial growth analysis.
SUBJECTS AND METHODS
2D-cephalometric data on two mandibular measurements (AP: articulare-pogonion; CP: condylion-pogonion) were selected from the Denver Growth Study, consisting of longitudinal records (age range: 7.9-19.0 years) of females (sample size N: 21; number of radiographs n: 154) and males (N: 18; n: 137). The SITAR mixed effects model estimated, for each measurement and gender separately, a mean growth curve versus chronological age, along with mean age at peak velocity (APV) and peak velocity (PV), plus subject-specific random effects for PV and mean size. The models were also fitted versus Greulich-Pyle bone age.
RESULTS
In males, mean APV occurred at 14.6 years (AP) and 14.4 years (CP), with mean PV 3.1 mm/year (AP) and 3.3 mm/year (CP). In females, APV occurred at 11.6 years (AP and CP), with mean PV 2.3 mm/year (AP) and 2.4 mm/year (CP). The models explained 95-96 per cent of the cross-sectional variance for males and 92-93 per cent for females. The random effects demonstrated standard deviations (SDs) in size of 5.6 mm for males and 3.9 mm for females, and SDs for PV between 0.3 and 0.5 mm/year. The bone age results were similar.
CONCLUSION
The SITAR model is a useful tool to analyse epidemiological craniofacial growth based on cephalometric data and provides an array of information on pubertal mandibular growth and its variance in a concise manner.

Abstract

BACKGROUND
SITAR (SuperImposition by Translation And Rotation) is a shape invariant growth curve model that effectively summarizes somatic growth in puberty.
AIM
To apply the SITAR model to longitudinal mandibular growth data to clarify its suitability to facial growth analysis.
SUBJECTS AND METHODS
2D-cephalometric data on two mandibular measurements (AP: articulare-pogonion; CP: condylion-pogonion) were selected from the Denver Growth Study, consisting of longitudinal records (age range: 7.9-19.0 years) of females (sample size N: 21; number of radiographs n: 154) and males (N: 18; n: 137). The SITAR mixed effects model estimated, for each measurement and gender separately, a mean growth curve versus chronological age, along with mean age at peak velocity (APV) and peak velocity (PV), plus subject-specific random effects for PV and mean size. The models were also fitted versus Greulich-Pyle bone age.
RESULTS
In males, mean APV occurred at 14.6 years (AP) and 14.4 years (CP), with mean PV 3.1 mm/year (AP) and 3.3 mm/year (CP). In females, APV occurred at 11.6 years (AP and CP), with mean PV 2.3 mm/year (AP) and 2.4 mm/year (CP). The models explained 95-96 per cent of the cross-sectional variance for males and 92-93 per cent for females. The random effects demonstrated standard deviations (SDs) in size of 5.6 mm for males and 3.9 mm for females, and SDs for PV between 0.3 and 0.5 mm/year. The bone age results were similar.
CONCLUSION
The SITAR model is a useful tool to analyse epidemiological craniofacial growth based on cephalometric data and provides an array of information on pubertal mandibular growth and its variance in a concise manner.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Center for Dental Medicine > Clinic for Orthodontics and Pediatric Dentistry
Dewey Decimal Classification:610 Medicine & health
Language:English
Date:24 May 2022
Deposited On:14 Oct 2021 14:41
Last Modified:25 Apr 2024 01:40
Publisher:Oxford University Press
ISSN:0141-5387
Additional Information:This is a pre-copy-editing, author-produced PDF of an article accepted for publication in The European Journal of Orthodontics following peer review. The definitive publisher-authenticated version Patcas, Raphael; Keller, Heidi; Markic, Goran; Beit, Philipp; Eliades, Theodore; Cole, Tim J (2021), Craniofacial growth and SITAR growth curve analysis, European Journal of Orthodontics: Online ahead of print is available online at: https://academic.oup.com/ejo/advance-article/doi/10.1093/ejo/cjab059/6358060.
OA Status:Green
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1093/ejo/cjab059
PubMed ID:34435635
  • Content: Accepted Version
  • Language: English