Abstract
BackgroundThe 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 MethodsAn 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.ResultsThird 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).ConclusionsFacial 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.
Highlights
Tooth agenesis may affect any tooth, the third molar being the most frequently affected by this anomaly (5.3-56.0% range) [1,2,3]
Agenesis of one or more third molars was observed in 25%, with a higher, not significant, frequency in women (28.1%)
Subjects with agenesis showed a significantly shorter lower facial height (42.7 ± 4.9o) than those who were not affected by it (45.0 ± 5.4o), which is comparable for the rest of cephalometric values (Table 3)
Summary
Tooth agenesis may affect any tooth, the third molar being the most frequently affected by this anomaly (5.3-56.0% range) [1,2,3]. An identifiable trait, often provides a visual vertical description of the face It is determined by a calculation involving five angles: facial axis, facial angle, mandibular plane angle, lower facial height and mandibular arch (Fig. 1). 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. 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
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