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. 2017 Sep 1;9(9):e1088-e1095.
doi: 10.4317/jced.53947. eCollection 2017 Sep.

Epidemiological survey on third molar agenesis and facial pattern among adolescents requiring orthodontic treatment

Rafael Gómez de Diego  1 , Javier Montero  2 , Nansi López-Valverde  3 , José Ignacio de Nieves  4 , Juan-Carlos Prados-Frutos  5 , Antonio López-Valverde  6
Affiliations

Epidemiological survey on third molar agenesis and facial pattern among adolescents requiring orthodontic treatment

Rafael Gómez de Diego et al. J Clin Exp Dent. .

Abstract

Background: The aim of this study was to determine the association between facial pattern according to Ricketts cephalometric analysis, and prevalence of third molar agenesis, taking subject age and gender as control variables.

Material and methods: An epidemiological survey was conducted based on a sample of 224 candidates for orthodontic treatment aged 12 to 24 (n=224). Third molar agenesis was recorded using Ricketts cephalometric analyses of lateral teleradiographs and panoramic radiographs. The risk for agenesis was predicted considering the 5 Vert Index parameters (facial axis, facial depth, mandibular plane angle, lower facial height and mandibular arch), facial type (brachyfacial, mesofacial, dolichofacial) and sociodemographic variables (age and sex), using odds ratio (OR) calculated by logistic regression.

Results: Third molar agenesis was observed in 25% of the sample. Risk for agenesis is significantly determined by sociodemographic factors (age, OR: 1.2), cephalic patterns (mesofacial vs dolichofacial, OR:4.3; and brachyfacial vs dolichofacial OR: 3.2) and cephalometric patterns (facial axis, OR: 0.8; lower facial height, OR: 0.8; and mandibular plane angle, OR:0.9).

Conclusions: Facial parameters (facial axis, lower facial height, and mandibular plane angle) proved to be strong predictors of the risk for third molar agenesis, the prevalence of agenesis being significantly lower in dolichofacial individuals. Key words:Facial Pattern, Ricketts Analysis, Third Molar Agenesis.

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Conflict of interest statement

Conflict of interest statement:The authors declare they have no conflicts of interest.

Figures

Figure 1
Figure 1
Facial pattern. 1) Facial depth angle. 2) Mandibular plane angle. 3) Lower facial height. 4) Mandibular arch.
See this image and copyright information in PMC

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