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Creating an Accurate 3D Geometrical Model of the Human ...

Creating an Accurate 3D Geometrical Model of the Human ...

Transformation The XY stack was re-sliced into the XZ stack (XZ planes.seq). Figure 3. Example of XZ plane image. Processing (1) Location of maximum-intensity pixel in every column (XZ outlines.seq) Figure 4. Example of occlusal surface outline, XZ plane image. (2) Conversion of outline to points: Figure 4 AND Figure 5 (Lines image) = Figure 6 Figure 5. Example of Lines image. Figure 6. Example of occlusal surface points, XZ plane image. (3) “Painting” subtracted the number of the frame in the stack from the image… the max value of each point in the frame varies according to the number of the frame: Figure 6 – number of the frame in the stack = Figure 7 Figure 7. Example of XZ plane image – points with Y coordinate information (max value). Coordinate measurement Coordinate measurement involved count/size and data collection. Figure 8. Data list. Occlusal surface points’ cloud coordinates (XYZ_Coordinates.txt): X = Center-X (mass) Y = [Den./Inten. (max)] x (units/pixel) Z = Center-Y (mass) Optical Models Figures 9 and 10 present models of the occlusal surfaces of two teeth. The models were created using data acquired with the 3D optical scanner. Meshing software was used for editing and rendering. Figure 9. A 3D model of the occlusal surfaces and gum. Figure 10. A 3D model of the occlusal surfaces of teeth and gum after editing.

Computed Tomography Models Multisectional spiral CT images (GE Healthcare LightSpeed Pro16 computed tomography system) were imported into Image-Pro Plus with a dicom2.exe converter. Figure 11. Example of the section of occlusal surface of the tooth in the CT XZ plane image. Figure 12 presents a 3D model of two teeth, which was created with data from computed tomography scanning. In this case, the resolution of the occlusal surfaces is significantly lower. Figure 12. A three-dimensional CT model of the occlusal surfaces. Hybrid Modeling Results Using data acquired with both optical and CT scanning systems, highly accurate three-dimensional geometrical models of all hard parts of the masticatory system can be created (Figures 13 – 15). Figure 13. Composition of optical and tomographic models. Occlusal surface taken from optical model (yellow); remaining surfaces (red) taken from tomographic model. Figure 14. Clench of several teeth and gums.

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