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Discriminant factor analysis of dental arch dimensions with 3-dimensional virtual models.
Am J Orthod Dentofacial Orthop. 2011 Nov; 140(5):680-7.AJ

Abstract

INTRODUCTION

The form and the size of a dental arch are products of the configuration and the naturally established balance of the jaw, alveolar bone, and muscles. We investigated which arch dimensions mostly discriminate particular dentoalveolar classes and sexes.

METHODS

Plaster dental casts were collected from 137 white adolescent subjects (71 girls, 66 boys) aged between 15 and 18 years (mean, 16.0 ± 1.2 years) with Class I (43 subjects: 24 girls, 19 boys), Class II (50 subjects: 28 girls, 22 boys), and Class III (44 subjects: 19 girls, 25 boys) malocclusions. Casts were scanned with the ATOS II SO (small objects) scanner (GOM mbH, Braunschweig, Germany) and measured with ATOS Viewer software (version 6.0.2; GOM mbH).

RESULTS

The major discriminating factors of the particular dentoalveolar classes are the mandibular canine width/depth ratio and the maxillary molar width/depth ratio, which explain 82.8% of the total variability (P <0.001). Class III subjects with the widest and shallowest frontal segment of the mandibular arch and the posterior segment of maxillary arch are clearly distinguished from Class II subjects whose abovementioned segments are the deepest and narrowest. Class I subjects are more similar to Class II than to Class III subjects. The most homogenous are Class III subjects, with 61.1% of them correctly classified, followed by Class II (57.8%) and Class I (52.4%). Sex differences are significant in linear measurements, but not in ratios.

CONCLUSIONS

Variability of dental arch dimensions and forms is a common characteristic of all dentoalveolar classes. Maxillary arch form is more distinguishing in the posterior segment, and mandibular arch form is more distinguishing in the anterior segment. Class III patients have the most detectable arch form, and Class I the least detectable arch form.

Authors+Show Affiliations

Department of Orthodontics, School of Dental Medicine, University of Zagreb, Zagreb, Croatia. mslaj@sfzg.hrNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

22051488

Citation

Slaj, Martina, et al. "Discriminant Factor Analysis of Dental Arch Dimensions With 3-dimensional Virtual Models." American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, vol. 140, no. 5, 2011, pp. 680-7.
Slaj M, Spalj S, Jelusic D, et al. Discriminant factor analysis of dental arch dimensions with 3-dimensional virtual models. Am J Orthod Dentofacial Orthop. 2011;140(5):680-7.
Slaj, M., Spalj, S., Jelusic, D., & Slaj, M. (2011). Discriminant factor analysis of dental arch dimensions with 3-dimensional virtual models. American Journal of Orthodontics and Dentofacial Orthopedics : Official Publication of the American Association of Orthodontists, Its Constituent Societies, and the American Board of Orthodontics, 140(5), 680-7. https://doi.org/10.1016/j.ajodo.2010.12.022
Slaj M, et al. Discriminant Factor Analysis of Dental Arch Dimensions With 3-dimensional Virtual Models. Am J Orthod Dentofacial Orthop. 2011;140(5):680-7. PubMed PMID: 22051488.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Discriminant factor analysis of dental arch dimensions with 3-dimensional virtual models. AU - Slaj,Martina, AU - Spalj,Stjepan, AU - Jelusic,Damir, AU - Slaj,Mladen, PY - 2010/04/01/received PY - 2010/12/01/revised PY - 2010/12/01/accepted PY - 2011/11/5/entrez PY - 2011/11/5/pubmed PY - 2011/12/30/medline SP - 680 EP - 7 JF - American journal of orthodontics and dentofacial orthopedics : official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics JO - Am J Orthod Dentofacial Orthop VL - 140 IS - 5 N2 - INTRODUCTION: The form and the size of a dental arch are products of the configuration and the naturally established balance of the jaw, alveolar bone, and muscles. We investigated which arch dimensions mostly discriminate particular dentoalveolar classes and sexes. METHODS: Plaster dental casts were collected from 137 white adolescent subjects (71 girls, 66 boys) aged between 15 and 18 years (mean, 16.0 ± 1.2 years) with Class I (43 subjects: 24 girls, 19 boys), Class II (50 subjects: 28 girls, 22 boys), and Class III (44 subjects: 19 girls, 25 boys) malocclusions. Casts were scanned with the ATOS II SO (small objects) scanner (GOM mbH, Braunschweig, Germany) and measured with ATOS Viewer software (version 6.0.2; GOM mbH). RESULTS: The major discriminating factors of the particular dentoalveolar classes are the mandibular canine width/depth ratio and the maxillary molar width/depth ratio, which explain 82.8% of the total variability (P <0.001). Class III subjects with the widest and shallowest frontal segment of the mandibular arch and the posterior segment of maxillary arch are clearly distinguished from Class II subjects whose abovementioned segments are the deepest and narrowest. Class I subjects are more similar to Class II than to Class III subjects. The most homogenous are Class III subjects, with 61.1% of them correctly classified, followed by Class II (57.8%) and Class I (52.4%). Sex differences are significant in linear measurements, but not in ratios. CONCLUSIONS: Variability of dental arch dimensions and forms is a common characteristic of all dentoalveolar classes. Maxillary arch form is more distinguishing in the posterior segment, and mandibular arch form is more distinguishing in the anterior segment. Class III patients have the most detectable arch form, and Class I the least detectable arch form. SN - 1097-6752 UR - https://www.unboundmedicine.com/medline/citation/22051488/Discriminant_factor_analysis_of_dental_arch_dimensions_with_3_dimensional_virtual_models_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0889-5406(11)00679-2 DB - PRIME DP - Unbound Medicine ER -