Abstract
The anatomy of dental compensation curve in the frontal plane described by George H. Wilson is one of the occlusal determinants of orthodontic treatment. However, there is few published comparing malocclusion and normocclusion individuals. Objectives: The aim of this study is to compare the curve of Wilson at first and second maxillary molars, normocclusion pattern and malocclusion pattern, with and without bilateral posterior crossbite, using angular references in CBCT studies. Material and Methods: We analyzed 10 cases of malocclusion with bilateral posterior crossbite, 10 cases of malocclusion without bilateral posterior crossbite and 10 cases with non orthodontic normocclusion (patients who underwent cone beam study for other reasons than orthodontic). All of them were adults, more than 19 years. Angular variables from left and right axis (line connecting the occlusal and furcation groove) of first and second molars towards a perpendicular to the frontal palate were measured. There was carried out an Anova test, Bonferroni analysis and Levene´s statistics. Results: The descriptive analysis of the results shows an average values of total maxillary curve of Wilson for first molars (sum of left and right angle) of 8.1° for normocclusion group, 0.4° for the malocclusion pattern with bilateral posterior crossbite and 16.9° for the malocclusion pattern without this alteration. The mean differences was statistical significant (P<0,042) between between malocclusion pattern groups with and without crossbite . Conclusion: The curve of Wilson, measured at maxillary first molars in patients with bilateral posterior crossbite is more concave than the other groups, suggesting no dentoalveolar compensations. Key words:Wilson curve, CBCT, buccal posterior occlusion, posterior crossbite.
Highlights
Occlusion in orthodontics has been studied looking for a benefit to the population, taking an importan place in finishing requirements [1,2,3,4,5]
Wilsons curve has been the subject of studies related to the change in angulation during growth [9], as an indicator of post-expansion [10] maxillary stability and even as a etiological factor of temporomandibulars disorders [11], but the emergence of the new CBCT records allows us to perform a more exhaustive study of the curve to try to quantify it in different normocclusion and malocclusion patterns
It allows us to measure the inclination of left and right molar and as can be seen in figures 1 and 2. It was performed a descriptive analysis of data and the following inferential analysis to compare the mean differences : analysis of variance (ANOVA), post-hoc test (Bonferroni analysis) and Levenes statistics
Summary
Occlusion in orthodontics has been studied looking for a benefit to the population, taking an importan place in finishing requirements [1,2,3,4,5]. Many theories support [6,7] different occlusion schemes, often with contradictory concepts, but there are few studies based on scientific evidence, trying to clarify and obtain clinical applicability. This is specially remarked regarding the frontal view at bucolingual posterior cusps, as we know that the occlusal surfaces of the molars do not follow a single plane. The fourth key is related to the curve of Wilson, describing the posterior inclination of the crowns of the posterior upper teeth as a concave curve, setting the molars with a lingual torque. The aim of this research is to verify that knowledge using CBCT images, comparing malocclusive adult cases with and without maxilar bilateral posterior crossbite and normocclusives non orthodontic adult individuals
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