CAM

Technologies: CAD/CAM 2013 Metal-Ceramic vs All-Ceramic Improved Materials Improved Technology  CAD/CAM Computer Aided Design/ Computer Aided...
Author: Laurel Bates
278 downloads 1 Views 2MB Size
Technologies: CAD/CAM

2013

Metal-Ceramic vs All-Ceramic

Improved Materials

Improved Technology  CAD/CAM

Computer Aided Design/ Computer Aided Manufacturing

      

Procera Cerec Everest Lava Celay Wol-Ceram Epc-CAM Cercon etc.

Application of science to dentistry CAD/CAM made it possible to work with a new generation of hard ceramics in dentistry. These materials cannot be cast so therefore must be machined. In order to machine something a cutting path is required. The cutting path is generated from digital scanned data. 

SCAN THE OBJECT



CREATE DIGITAL DATA POINTS



GENERATE CUTTING PATH



MACHINE REPLICA OBJECT

CAD/CAM What is dental CAD/CAM? Dental CAD/CAM is the process by which the model of a prepared tooth is scanned. This data is then used to generate the coping design (CAD) which in turn is used to generate a cutting path for manufacturing the coping (CAM).

 



Computer Aided Design (CAD) and Computer Aided Manufacture (CAM) in restorative dentistry can be used to: Reduce production time for copings and frameworks; increasing overall productivity Introduce consistent and measurable accuracy Provide evidence of product quality

CAD/CAM technology 





Scanner - digital impression of the prepared teeth Software – CAD - digital cast on the screen - virtual design of the model Milling unit – CAM - computer aided milling unit (cnc) - grinding process



Non-contact sensor: optical: laser point, laser stripe, white light, fotogrammetry



Contact sensor: mechanical

Elements – material versatility

Presintered, yttrium-stabilised, HIP zircon  Copings and bridges

Non- shrinkage zircon silicat  Full crowns in the posterior region Industrial manufactured titanium blanks  Copings, crowns and bridges Leucite-reinforced glass ceramics  Inlays, Onlays, Veneers as well as anterior and posterior copings



Green processing  Milling

of presintered ceramic blocks  advantage: easy to process, grinding instruments do not have to be replaced that often  disadvantage: porous presintered zirconia shape shrinks during final sintering- enlarged substructures= software calculated 

Hard processing  Milling

of dense sintered ceramic blocks  Takes more time, grinding instruments wear off 

HIP= Hot Isostatic Press : special sintering technique  High

temperature and pressure applied to densify the material, gaining 20% more in strength

Frameworks zirconium oxide

CAD/CAM methods 

In clinic - the dentist purchases an intra-oral scanner, the cutting machine and the consumable materials. All the work is done by the dentist at the clinic. Mainly suitable for full crowns, inlays and onlays.



In lab - the laboratory purchases a scanner, cutting machine and consumables. The dentist sends the patient's impressions and prescription to the lab. The lab scans models of the prepared teeth, designs the restoration and machines the restoration.

CAD/CAM methods 

Centralised machining - in this situation the lab purchases or leases a scanner only. Again, the dentist sends the patient's impressions and prescription to the lab. The lab scans models of the prepared teeth and designs the coping and then sends this data off to an external machining centre. The machined coping is returned to the lab for veneerig.



Centralised scanners and machining - the laboratory sends the model away to the external centre to be scanned. The coping is also designed and machined at the external centre. The model and coping are sent back to the lab for veneering.

ProceraCentralised machining

Stockholm/ Sweeden

  

 

 

Making a sectioned cast in the lab Scanning the die and the cast CAD-data sent to central machining center (checking) Milling starts in 19 minutes Copings (hand) packed and mailed delivered within 5 days First patient 1985 (1994)

Katana-Centralised machining

Semmelweis Laboratory

Everest-in lab •

ScanMeasuring unit

• EngineMilling and grinding unit •

ThermSintering unit



ElementsMaterials

Software User interface

Light beam projection 

15 projection sequences



The rotary plate moves on its vertical and horizontal axis during this process

CAD- Software



The preparation limit is automatically detected

Design Decision guidance

Form of margins Juncture region Metal margin Framework thickness

  

3-D virtual view of the occlusion on the screen The distances between occlusion and framework construcion are shown with different colours. Easy, quick and safe design of frameworks in connection with the virtual wax knife.

Design Virtual wax knife -

-

Can be used to process the virtual framrwork in three dimensions on the screen Precise addition or removal of virtual material enables quick and precise waxing

Design

Cantilever bridge

Bridge for veneering

CAM Engine 

5-axis technology  Ensures secure milling of undercuts • The wide degree of freedom during the milling process enables complex geometry • Engine speed 5.000 – 80.000 min-1

Engine Simultaneously controlled 5-axis technology  Thin crown margins and best marginal fit  The wide degree of freedom during the milling process enables complex geometry  Engine speed 5.000 – 80.000 min-1 

Engine 

The 5-axis milling strategy

5-axis technology

Milling of titanium

Cerec-in clinic

Intraoral scanning-no impression  Digaital images of tooth and opposing arch 

CAD and CAM

Milling the crown

20 minutes chairside

Milling titanium

Thank You for Your Attention!