Machinable ceramics6)ceramics credit … · Advantages •Reduce production ... CEREC . CEREC scan...
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Transcript of Machinable ceramics6)ceramics credit … · Advantages •Reduce production ... CEREC . CEREC scan...
Machinable ceramics
CAD – CAM system
CAD
Computer aided manufacturing CAM
Computer aided design
Digitizing
Designing
Milling
• Intra – oral
• Extra – oral –Cast
–Die
–Pattern
–Impression
–Bite registration
Digitizing
Teeth powdering with
non-reflective
material
optical
impression
Contact
digitizing
Non-contact
digitizing
Designing
Milling
Advantages
• Reduce production time.
• Introduce consistent and measurable
accuracy.
Disadvantages
• Expensive technique .
• Some are not user friendly and very
complicated .
• Micro fractures are generated during grinding
.
• Difficult to maintain dimensional accuracy.
Computer controlled construction of large dies
Computer controlled of milling of large copings
Milled Sintered
• Shrinkage 50% by volume, 21% linear
50% dense zirconia
Using of shrinkage free blanks (fully sintered blanks)
COPY MILLING
