Abstract
Introduction: The position of lower incisor has been of considerable concern when planning an orthodontic treatment, having been recognized as one of diagnostic keys, Very important in the development of malocclusion and facial pattern. Objectives: In this study we claim to determine the importance of the position and inclination of lower incisor in the different malocclusions and facial patterns, and to base which of the cephalometric measurement parameters are the mostreliable. Material and Methods: Ninety lateral radiographies were taken, and they were classified by skeletal malocclusion and facial pattern.These teleradiographies have been performed cephalometric analysis, which includelower incisor position belong the following analysis: Ricketts, Riolo, Tweed, McHorris, Jarabak-MSE and Holdaway. Study Design: Cross-sectional study where we perform statistical analysis Anova test, Pearson correlations and Bonferroni analysis. Results: The analyzed measurements present a statistically significant differentiation in lower incisor inclination respect to the anterior cranial base, McHorris angle, angulation of lower incisor respect to occlusal plane and mandibular plane. Conclusions: There are statistically significant differentiation in lower incisor position and inclination respect the malocclusion and individual facial pattern. Key words:Lower incisor, cephalometric analysis, facial patterns, facial biotype, skeletal malocclusions.
Highlights
The position of lower incisor has been of considerable concern when planning an orthodontic treatment, having been recognized as one of diagnostic keys, Very important in the development of malocclusion and facial pattern
Lower incisor and its position in the lower arch is considered to be of prime importance at time of planning an orthodontic treatment, having been this recognized as one of the keys in the orthodontic diagnostic.This paper of crucial importance in orthodontics is giving by its effects on aesthetic and stability [1]
The analyzed parameters, according to the Anova test, show values statistically significant when analyzing differences found in different skeletal malocclusions which are: the angulation of the lower incisor respect to the anterior cranial base, the McHorris angle, and the angulation of the inferior lower respect to mandibular plane and to occlusal plane; all of them with a signification of p=0.000, except McHorris angle, with a data of p=0.002 (Table 2)
Summary
The position of lower incisor has been of considerable concern when planning an orthodontic treatment, having been recognized as one of diagnostic keys, Very important in the development of malocclusion and facial pattern. The incisal adaptation to changes that sagittal maxillo-mandibular relationship suffers during growing, has been demonstrated in many longitudinal studies [6] With these ideas in mind, it can be stated there is a close relationship between the antero-posterior relationship of the jaw or mandible, and the incisor inclination [7,8]. It is a frequent objective of the presurgical orthodontic, to decompensate the inclination of a lower incisor, which it can be hidden or at least, doing less evident the basic skeletal pathology. As a result, it makes easier the obtainment of more favourable post-surgical results [13]. Shape of the alveolar bone, in the incisor region, corresponds with the inclination of the lower incisor [4,15]
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