Radiopaque Tissue Surface-Based Digital Registration Technique for Completely Edentulous Ridge

Figure 1. Clinical examination. Figure 2. Radiographic tissue-surface impression of the edentulous mandible using a radiopaque impression material and closed-mouth impression technique. Figure 3. Radiopaque impression material lining on the tissue surface of the recording base. Figure 4. Positive form of the digitized impression body that is a negative imprint of the edentulous arch obtained from optical surface scanning. Figure 5. Digital model of the edentulous ridge generated by reversal of the digitized impression body. Figure 6. Virtual teeth arrangement on the digital model.

Figure 7. Radiopaque impression material lining on the tissue surface of the recording base. Figure 8. Three-dimensional image registration of the digital edentulous model to the radiographic data based on the surface of the radiopaque impression. Figure 9. Cross-sectional image shows the accuracy of the image registration. (L, left; R, right). Figure 10. Planning of the implant position based on the registered image of the underlying bone, digital model, and virtual teeth arrangement. Figure 11. Color-coded map showing the internal misfit of the surgical guide. Green indicates a closely matched surface (error ± 0.1 mm). Yellow to red shades: the test model is larger than the reference (error between +0.1 mm and +0.63 mm). Light blue to dark blue shades: the test model surface is smaller than the reference (error between −0.1 mm and −0.63 mm).