intro to digitals Flashcards
CAD vs CAM
CAD: Computer Aided Designing
CAM: Computer Aided Manufacturing
WHY I NEED TO KNOW
ABOUT THIS?
WHAT YOU MAKE IS WHAT YOU GET
DENTAL MILLING MACHINE CLINIC RELATED FACTORS
q Milling?
q Dry and Wet?
q Functional Movement of?
q Milling Axis
q Dry and Wet Milling
q Functional Movement of Bur
MILLING AXIS
* MOST CHAIRSIDE MILLING MACHINES ARE?
* MOST LABORATORY MILLING MACHINES ARE?
- DENTAL MILLING MACHINES CAN MILL VARIETY OF RESTORATION TYPES AND MATERIALS.
- MOST CHAIRSIDE MILLING MACHINES ARE 4-AXIS MILL
- MOST LABORATORY MILLING MACHINES ARE 5 OR MORE AXIS MILL
FOUR AXIS MILLING MACHINE
- THE MILLING BUR MOVES IN THE 3 AXES, X, Y, AND Z, AND THE MATERIAL BLOCK CAN ROTATE IN 1 ADDITIONAL AXIS (ALSO TERMED 3 + 1 AXIS MILLING MACHINE
- THE ADDITION OF A FOURTH AXIS (A AXIS) ALLOWS THE BLOCK TO BE?
- THE ADDITION OF A FOURTH AXIS (A AXIS) ALLOWS THE BLOCK TO BE
AUTOMATICALLY FLIPPED OVER, SO THE MACHINE CAN REMOVE MATERIAL
FROM BOTH SIDES
FIVE AXIS MILLING MACHINE
* MILLING MACHINES WITH?
* MILLING OF MORE?
- MILLING MACHINES WITH 5 OR MORE AXES CAN ROTATE THE MATERIAL BLOCK IN ADDITIONAL AXES
- MILLING OF MORE COMPLEX DESIGNS – UNDERCUTS IN IMPLANT
SUPERSTRUCTUR
5 AXIS CNC MACHINES CAN SELECT TWO OF THE?
5 AXIS CNC MACHINES CAN SELECT TWO OF THE THREE ROTATIONAL
AXES (A,B,C) TO USE. THE A, B, AND C AXES PERFORM A 180° ROTATION
AROUND THE X, Y, AND Z AXES, CORRESPONDINGLY.
foru vs five axis milling machines
Accuracy and resolution?
DRY AND WET MILLING
*What DETERMINES WHETHER A MILL SHOULD BE DRY OR WET?
* WET MILLING materials
* DRY MILLING materials
* BOTH DRY AND WET materials
- IN GENERAL, THE TYPE OF MATERIAL BEING MILLED DETERMINES WHETHER A MILL SHOULD BE DRY OR WET.
- WET MILLING: LITHIUM DISILICATE, FELDSPATHIC PORCELAINS, AND CHROME COBALT METALS
- DRY MILLING: WAX, SOME ACRYLIC, AND RESIN
- BOTH DRY AND WET: ZIRCONIA, TITANIUM, AND SOME ACRYLIC
liquid of wet milling functions
- KEEPING BOTH THE TOOL AND MATERIAL COOL
- HELPS TO REMOVE MATERIAL FROM THE MILLING DISK OR BLOCK CERTAIN (CLEAN FILTER)
- ADDITIVES CAN ALSO BE INCLUDED IN THE LIQUID TO ACT AS A CUTTING LUBRICANT (CLEAN WATER TANK)
dry milling maintenance
DRY MILLING DOES NOT USE LIQUID TO REMOVE SCRAP MATERIAL AWAY FROM THE CUTTING SURFACE, BUT RATHER PRESSURIZED AIR, VACUUM, OR A COMBINATION OF
BOTH.
* MAINTENANCE CLEANING IS STILL REQUIRED, AS A CONSIDERABLE AMOUNT OF DUST AND SHAVINGS ARE GENERATED WITH DRY MILLING.
* VACUUM SIZE, NOISE, AND OPERATING EXPENSE SHOULD ALL BE CONSIDERED BEFORE MAKING A PURCHASE.
FUNCTIONAL MOVEMENT OF BUR
* BUR MOVEMENT AT MILLING IS THE REVERSE OF?
* A SUCCESSFUL TEETH PREPARATION SHOULD?
- BUR MOVEMENT AT MILLING IS THE REVERSE OF TEETH PREPARATION.
- A SUCCESSFUL TEETH PREPARATION SHOULD FOLLOW THE MILLING PROCESS AND BUR DIMENSION.
FUNCTIONAL MOVEMENT OF BUR
1. MARGIN AT LEAST ? WIDTH IN
DIMENSION OF THE BUR TIP’S SIZE.
2. CUSP AND FOSSA AT LEAST THE
SAME DIMENSION OF?
3. PREPARED TEETH HEIGHT AT?
4. MARGIN THICKNESS IS DEPENDS
ON?
5. TAPERING ANGLE DEPEND ON?
- MARGIN AT LEAST ½ WIDTH IN DIMENSION OF THE BUR TIP’S SIZE.
- CUSP AND FOSSA AT LEAST THE SAME DIMENSION OF THE BUR TIP’S SIZE.
- PREPARED TEETH HEIGHT AT MOST THE BUR’S LENGTH.
- MARGIN THICKNESS IS DEPENDS ON BOTH THE BUR SIZE AND CROWN MATERIAL.
- TAPERING ANGLE DEPEND ON THE BUR DESIGN (DISCUSS LATER)
CURRENT AVAILABLE MILLING MACHINE at school
CEREC MCXL (4-Axis)
number of bur sets
4
bur set 1 for four axis
milling bur set 2
milling burr set 3
bur set 4
width of prep requirements?
This width should not be less than 1.0 mm (0.8 -1.25 mm)
vertical walls prep requirements
tall vertical walls
HOLY” ZONE (OVER MILL);
RECOMMENDATION:
ENSURE PREPARATION SHOULDERS AND CUSPS ARE AT LEAST 1.0 MM IN
DIAMETER.
prep req: margins designs
prep undercuts for milling
Undercut detected but will not mill à Open margin
Undercut not detected à Not seat
