POTENTIAL RELATIONSHIP BETWEEN INCLINATION OF THE LOWER INCISORS AND MANDIBULAR SYMPHYSIS PARAMETERS IN PATIENTS WITH ANTERIOR CROSSBITE
Keywords:
inclination of the lower incisors, mandibular symphysis, anterior crossbite, lateral cephalogram, 3D cone beam computerized tomographyAbstract
In the majority of cases anterior crossbite presents with vestibular inclination of the lower anterior teeth. Vestibular bone coverage in cases of protrusion is less thick. Development of recessions in this area depends on the anatomical features of the mandibular symphysis.
Aim:To study the potential relationship between the inclination of the lower incisors and the parameters of the mandibular symphysis in patients with anterior crossbite using profile teleradiography and 3D cone beam computed tomography.
Material and methods: We examined 20 patients with anterior crossbite aged 18-37 years (mean age 25.70 ± 5.95) who had not undergone orthodontic treatment. Profile teleradiographs and 3D cone beam computed tomography were performed on the included subjects. The inclination of the lower incisors and the parameters of the symphysis were measured (width at the narrowest and widest part and height – vestibularly and lingually).
Results: Protrusion was prevalent in patients – 6 (30%) patients had retrusion and 14 (70%) had protrusion which is a significant difference of 40% (p = 0.26). The difference in the measurement of the inclination of the incisors using the two methods is not statistically significant (p = 0.128). Symphysis width measured on 3D cone beam computerized tomography amounts to 5.79 ± 0.74 mm in the narrow part and 15.41 ± 1.89 mm in the wide part. The height of the symphysis has a value of 24.19 ± 3.52 mm vestibularly and 25.20 ± 3.0 mm lingually. A significant positive correlation (Table 3) was found between the vestibular height of the symphysis and the inclination of the incisors in the mandible (r = 0.473, p = 0.035). A greater inclination of the incisors is associated with higher values of the vestibular height of the symphysis.
Conclusion:We found a high level of consistency between teleradiographic and 3D cone beam tomographic measurements of the inclination of the lower incisors. Protrusion of lower incisors is associated with higher values of the symphysis measured vestibularly.
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