Using Condyle Positioning for the Digital Face Bow
Bellus3D has added the ability for users to place left side and right side condyle location markers on the face model as locations in 3D space that are coincident with the alignment of the face and jaw models. By having the face model, jaw model and condyle points coincident the models can be imported to a virtual articulator in dental planning software to achieve a digital face-bow for improving simulation of occlusal contacts in the planning of restorations.
There are two methods that can be used for positioning the condyle location markers within Dental Pro. The first method consists of placing a physical sticker or ink dot on the patient's face at the time of face scanning providing a physical target reference point that is captured as part of the face scan. The left and right positions can be established by palpitation or using industry convention for the average position referenced by an axis line extending from the center of tragus to the lateral canthus (outer angle point of the eye fold) . More specifically, the average condyle position is a point that is 3 mm orthogonally offset from the "tragus-lateral canthus" axis that is positioned 11 mm from the center of the tragus.
An accepted practice for finding the condyle point is to traverse 11 mm along the line from the center of the tragus towards the outer angle of the eye (lateral canthus) that is orthogonally upward offset of 3 millimeter high. (see the picture below)
Once the left and right side condyle points are positioned within Dental Pro, they can can be exported as a distinct export STL file. When jaw files have been imported from 3Shape Communicate, the condyle points can be exported directly back into 3Shape Communicate under the same case id of the jaw files.
The condyle position enables an "automatic snap to position" import of the face and jaw files into a virtual articulator in dental planning software. This provides a fast placement that optimizes the dental planning workflow.
In Dental Pro, open a Workspace, tap Guides, then tap condyle points. You will see something similar to this:
Then, after you set the left and right condyle points, export the Guides and face model and you will have this (demonstrated in Meshlab on a Mac...but you could import or upload into 3Shape):
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