2 - Digital Dentistry Concepts Flashcards
(28 cards)
Why do we need dental records in prosthodontics
To capture the patient
(Now we can do that virtually - virtual patient)
First digital instrument is
pictures
Where so we use digital dentistry
Fixed prosth
Removable prosth
Implant dentistry
Maxillofacial surgery
Endodontics
TMD and OFP
Orthodontics
Orthognathic surgery
Data acquisition
Trying to scan the surface (intro oral or impression and scan impression)
Intra-oral scanning and model scanning
Surface mapping that allows for the surface geometry or shape of an object to be stored as a set of 3D points or vertices. The surface of the object is then stored as a series of polygons (or faces) that are constructed by indexing these vertices. The number of verticies the face may index can vary, though triangular faces with three vertices are common
3D surface scanning
The process of acquiring the 3D image of a dental model for translation into a digital file format, such as STL. The digital file can be stored for future reference or used in a CAD software program for the design and fabrication of a dental prosthesis
Model Scanning
What makes a picture
Pixels
STL file
File format used for 3D images
Vertices (points) create –> _____ which create –> ___ which create –> ___ which create
Edges (lines)
faces
(this is the STL)
polygons
surfaces
Different file formats
No color and Color
What is the name of the file format for no color
Standard Tessellation Language (.stl)
What is the name of the file format for color
Digital color model (.DCM)
Object file format (.obj) (ortho)
Polygonal file format (.ply) (additional layer)
Look at pics for STL format vs PLY format
Look at photos
File format native to the stereolithography CAD software created by 3D systems. This file format is supported by many other software packages; it is widely used for rapid prototyping and computer-aided manufacturing. This describes only the surface geometry of a 3D object without any representation of color, texture, or other common CAD model attributes
Standard Tessellation Language (STL)
3D file format that stores graphical objects described as a collection of polygons. File also specifies properties associated with each vertex, such as coordinates, normals and color
Polygon file format (PLY)
Simple data-format file that represents 3D geometry alone: the position of each vertex, position of each texture coordinate vertex, normal, and the faces that make each polygon defined as a list of vertices, and texture vertices.
OBJ
After data acquisition we –>
Design CAD (Computer aided design)
The use of computer programs to create two or three dimensional graphical representations of physical objects. CAD software may be specialized for specific applications
Computer aided design (CAD)
After design CAD –>
Manufacuring CAM
The use of computer software to control machine tools and related machinery in the manufacturing of work pieces. Its primary purpose is to create a faster production process and components and tooling with more precise dimensions and material consistency. In some cases, it uses only the required amount of raw material (thus minimizing waste), while simultaneously reducing energy consumption.
Computer - aided manufacturing (CAM)
Subtractive manufacturing vs additive manufacturing
Subtractive = milling (3-Axis, 4-axis, 5-axis, 7-axis)
Additive = 3D printing (FDM, DLP, SLA, SLS/SLM)
Advantage of having extra axises in milling
Undercuts
More Details
(showed video of 4 vs 5 axis)
Additive manufacturing
FDM:
Filament deposition modeling
Most basic
Not used in dentistry
Not much detail and accuracy
Additive manufacturing
SLA:
Stereolithography
Cures resin layer by layer
super accurate
Very slow
25-100 um
