1
Q
The clinical protocols for digitizing the tissue surface of a denture depend on the used system.
A
- Direct scanning of the supporting tissue using (Intra – Oral Scanner)
- Indirectly scanning the stone cast or even the impression, using lab. Desktop scanner or intraoral scanner.
2
Q
Advantages of intra-oral scanner over conventional impression
A
- improvement of patients’ comfort .
- facilitation of laboratory procedures, without the need of physical casts.
- dimensionally accurate for CD fabrication.
digital denture technology is still behind as regards the registration of maxillomandibular relationships.
3
Q
currently two principal methods exist. both require the appropriate three-dimensional (3D) denture design CAD files.
A
- The additive method (also called rapid prototyping) was invented in 1981 and can be encountered as 3D printing.
- fabricate a 3D object in a layer-by- layer fashion based on the relevant CAD file.
4
Q
Comparing 3D printing vs. Milling Method
A
- Both CAM technologies offer clinically acceptable results faster than the traditional process.
- 3D printer is more affordable than a milling machine
- Selection of the appropriate 3D printer is a complicated task, while milling have been on the market for a longer period .
- CDs produced with the Milling method have been found to be superior in toughness and color stability than the 3D- printed ones.
- the bond strength of denture teeth might be a concern with both CAM techniques
5
Q
Summery of Digital complete denture steps
A
- Digital impression (intra-Oral Scanner).
- Fabrication of Base plate and occlusion rim.
- Conventional jaw relation record. Scanning of the record.
- Selection and arrangement of the artificial teeth digitally.
- Printing or milling a trial denture (mono-block)
- Try-in, minimal adjustments by grinding or adding wax to the trial denture.
- Milling of the denture base and teeth separaely
- Bonding of the teeth to the denture base sockets.
- Polymerization in a pressure pot, finishing and polishing.
