Second premolar agenesis is associated with mandibular form: a geometric morphometric analysis of mandibular cross-sections
Identifieur interne : 000525 ( Main/Exploration ); précédent : 000524; suivant : 000526Second premolar agenesis is associated with mandibular form: a geometric morphometric analysis of mandibular cross-sections
Auteurs : Michael H. Bertl [Autriche] ; Kristina Bertl [Suède, Autriche] ; Manuel Wagner [Autriche] ; André Gahleitner [Autriche] ; Andreas Stavropoulos [Suède] ; Christian Ulm [Autriche] ; Philipp Mitteroecker [Autriche]Source :
- International Journal of Oral Science [ 1674-2818 ] ; 2016.
Abstract
The aim of this study was to compare mandibular form (i.e., size and shape) between patients with agenesis of the lower second premolar (P2) and a control group with no agenesis. Three hypotheses were tested: (H1) agenesis causes a change in mandibular morphology because of inadequate alveolar ridge development in the area of the missing tooth (mandibular plasticity); (H2) agenesis is caused by spatial limitations within the mandible (dental plasticity); and (H3) common genetic/epigenetic factors cause agenesis and affect mandibular form (pleiotropy). A geometric morphometric analysis was applied to cross-sectional images of computed tomography (CT) scans of three matched groups (
Url:
DOI: 10.1038/ijos.2016.41
PubMed: 27857074
PubMed Central: 5168418
Affiliations:
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<front><div type="abstract" xml:lang="en"><p>The aim of this study was to compare mandibular form (i.e., size and shape) between patients with agenesis of the lower second premolar (P2) and a control group with no agenesis. Three hypotheses were tested: (H1) agenesis causes a change in mandibular morphology because of inadequate alveolar ridge development in the area of the missing tooth (mandibular plasticity); (H2) agenesis is caused by spatial limitations within the mandible (dental plasticity); and (H3) common genetic/epigenetic factors cause agenesis and affect mandibular form (pleiotropy). A geometric morphometric analysis was applied to cross-sectional images of computed tomography (CT) scans of three matched groups (<italic>n</italic>
=50 each): (1) regularly erupted P2; (2) agenesis of P2 and the primary second molar <italic>in situ</italic>
; and (3) agenesis of P2 and the primary second molar missing for >3 months. Cross-sections of the three areas of interest (first premolar, P2, first molar) were digitized with 23 landmarks and superimposed by a generalized Procrustes analysis. On average, the mandibular cross-sections were narrower and shorter in patients with P2 agenesis compared with that in the control group. Both agenesis groups featured a pronounced submandibular fossa. These differences extended at least one tooth beyond the agenesis-affected region. Taken together with the large interindividual variation that resulted in massively overlapping group distributions, these findings support genetic and/or epigenetic pleiotropy (H3) as the most likely origin of the observed covariation between mandibular form and odontogenesis. Clinically, reduced dimensions and greater variability of mandibular form, as well as a pronounced submandibular fossa, should be expected during the treatment planning of patients with P2 agenesis.</p>
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