Abstract
The aim of this study was investigate the association between the mandibular arch morphology and the facial type of Brazilian Caucasians with natural normal occlusion. For this, we used a sample comprised of lateral radiographs and respective dental casts of 51 individuals (21 male and 30 female), presenting at least 4 of the 6 Andrews' keys to normal occlusion without previous orthodontic treatment. Angle's first molar relationship was considered indispensable for the sample. The facial type was defined by two cephalometric measurements (SN.SGn and SN.GoGn). After scanning the models (3D) and radiographs, the images were evaluated by 12 orthodontists. A modified Kappa test evaluated the agreement between examiners to classify the morphology of the dental arch. The chi-square test was used to verify the association between the facial type (dolichofacial, mesofacial, or brachyfacial) and the dental arch morphology (square, oval, or tapered), using significance level of 5%. Casual and systematic errors (p > 0.05) showed no significant results and the Kappa test showed significant agreement among examiners for the dental arch form (0.55) with a p < 0.001, considered as 'moderate'. The chi- square test indicated no significant association. The null hypothesis was accepted, as the facial type was not associated with dental arch morphology in individuals with normal occlusion.
Highlights
Treatment plan comes from a routine patient data collected
Vertical facial skeletal pattern comprises an essential item for an adequate diagnosis, since characterizing facial type, craniofacial growth can be described and quantified by means of dimensional, angular and topographical features
The study was approved by the Research Ethics Committee of the Methodist University - UMESP (Protocol no. 281691 - 09). This is an analytical observational study on initial sample comprising 95 lateral cephalometric radiographs taken with the same x-rays machine and operator with their respective dental casts carefully selected from 13,618 white students, in the department of orthodontics located in the Methodist University of São Paulo
Summary
Treatment plan comes from a routine patient data collected. Among these data, vertical facial skeletal pattern comprises an essential item for an adequate diagnosis, since characterizing facial type, craniofacial growth can be described and quantified by means of dimensional, angular and topographical features. Health Sciences facial skeletal pattern, often referred as facial type, when analyzed radiographically, can be classified as dolichofacial (more long and narrow face), brachyfacial (more shorter and wider face), and mesiofacial (intermediate type) (RICKETTS et al, 1979). Facial morphology is defined and maintained during growth; under genetic control in determining the Maringá, v. The facial type can be determined by subjective evaluation or by using cephalometric analyses, i.e., a set of measurements of the facial complex that shows the predominant direction of growth. Several authors described facial type analyses (RICKETTS et al, 1979; RIEDEL, 1952; SASSOUNI, 1955)
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