Introduction:Cone-Beam Computed Tomography (CBCT) is essential for tridimensional planning of
orthognathic surgery, as it allows visualization and evaluation of bone structures
and mineralized tissues. Tomographic slices allow evaluation of tooth inclination
and individualization of movement performed during preoperative decompensation.
The aim of this paper was to assess maxillary and mandibular incisors inclination
pre and post orthodontic decompensation in skeletal Class III malocclusion. Methods: The study was conducted on six individuals with skeletal Class III malocclusion,
surgically treated, who had Cone-Beam Computed Tomographic scans obtained before
and after orthodontic decompensation. On multiplanar reconstruction view,
tomographic slices (axial, coronal and sagittal) were obtained on the long axis of
each incisor. The sagittal slice was used for measurement taking, whereas the
references used to assess tooth inclination were the long axis of maxillary teeth
in relation to the palatal plane and the long axis of mandibular teeth in relation
to the mandibular plane. Results: There was significant variation in the inclination of incisors before and after
orthodontic decompensation. This change was of greater magnitude in the mandibular
arch, evidencing that natural compensation is more effective in this arch, thereby
requiring more intensive decompensation. Conclusion: When routinely performed, the protocols of decompensation treatment in surgical
individuals often result in intensive movements, which should be reevaluated,
since the extent of movement predisposes to reduction in bone attachment levels
and root length.