Abstract
The dynamic correlation between teeth and denture morphology as well as the morphological positions needs to be explored.Methodology63 adult patients with skeletal class III malocclusions that met the inclusion criteria were enrolled and imaged with Cone Beam Computed Tomography (CBCT), and Digital Imaging and Communications in Medicine (DICOM) data were collected. The torque angle and axial inclination were measured and analyzed for the corona, root, and entire body of every tooth on the maxilla.ResultsThere is a statistically significant difference between the coronal axial inclination/coronal torque angle for the skeletal class III malocclusion cases and Andrew’s six keys of occlusion. On the sagittal plane of the maxillary denture (except that the secondary molar is inclined medial-distally), the remaining teeth are inclined towards the labia with slightly larger angles compared to the normal occlusion. In the coronal direction, the maxillary anterior teeth tend to have a corona that inclines medial-distally, whereas the posterior teeth have a buccal inclination compared to the normal occlusion.ConclusionSagittal and transversal compensations prevail in maxillary dentures; for the camouflaged treatment design for skeletal class III, there is limited scope of sagittal and transversal movements on the maxillary denture.
Highlights
Skeletal class III malocclusion is a severe malocclusion abnormality that results from sagittal and transversal malposition of the maxilla and mandible, which leads to denture compensation or decompensation [1]
On the sagittal plane of the maxillary denture, the remaining teeth are inclined towards the labia with slightly larger angles compared to the normal occlusion
Existing studies regarding the denture position characteristics for the skeletal class III malocclusion abnormality provide only a macro indication that is expressed by the length/width of the arch; the relation of the area in between each tooth site and the arch morphology is unclear
Summary
Skeletal class III malocclusion is a severe malocclusion abnormality that results from sagittal and transversal malposition of the maxilla and mandible, which leads to denture compensation or decompensation [1] The treatment for this abnormality primarily includes camouflage treatment [2] and/or orthodontic-occlusion treatment [3]. Existing studies regarding the denture position characteristics for the skeletal class III malocclusion abnormality provide only a macro indication that is expressed by the length/width of the arch; the relation of the area in between each tooth site and the arch morphology is unclear. This experiment summarizes the measurement metrics and provides a quantification analysis of each tooth site characteristics on a maxillary denture that has skeletal class III malocclusion abnormality to provide experimental inputs and data reference for a clinical design and treatment plan for the skeletal class III malocclusion abnormality
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