Computerized Cd

Question 1

The clinical protocols for digitizing the tissue surface of a denture depend on the used system.

Answer 1

1. Direct scanning of the supporting tissue using (Intra – Oral Scanner)
2. Indirectly scanning the stone cast or even the impression, using lab. Desktop scanner or intraoral scanner.

Question 2

Advantages of intra-oral scanner over conventional impression

Answer 2

• 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.

Question 3

currently two principal methods exist. both require the appropriate three-dimensional (3D) denture design CAD files.

Answer 3

• 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.

Question 4

Comparing 3D printing vs. Milling Method

Answer 4

• 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

Question 5

Summery of Digital complete denture steps

Answer 5

• 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.