Method for determining a mapping of the contacts and/or distances between the maxillary and mandibular arches of a patient
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[0055]Obtaining Meshes of the Maxillary Arch and the Mandibular Arch
[0056]Prior to the implementation of the method, the dental arches have been scanned in occlusion position with a known and reproducible relationship. A tool that can be used for this purpose is an intrabuccal optical imprint camera. One arch is scanned then the other, as well as a vestibular imprint (on the side) of the teeth in occlusion position to know the position of one arch with respect to the other. This operation is known per se and does not as such form part of the invention. Another method could consist in using a table scanner. This scans the plaster models derived from physical-chemical imprints one after the other then occlusion position. The invention may in fact be implemented with a 3D model of the dental arches generated by commercially available techniques.
[0057]The result of these scannings is a surface mesh of the maxillary arch and the mandibular arch. Each mesh is defined in an orthonormal coordi
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Abstract
- obtaining the mandibular kinematics recorded on the patient;
- obtaining surface meshes of the maxillary arch and the mandibular arch and registering said meshes relative to one another;
- creating a reduced mesh of at least one of said arches, comprising the selection, in the mesh of said arch, of the cells in which the nodes are located at a distance of less than 1 cm from the mesh of the opposite arch;
- creating, for each cell of said reduced mesh, a bounding box comprising a plurality of voxels surrounding said cell;
- using the mandibular kinematics, calculating a network of contacts comprising, for each voxel of the bounding box, information on the existence of a contact between said voxel and a node of the mesh of the opposite arch during a relative movement of the mandibular arch in relation to the maxillary arch.
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