BASIC TECHNIQUES MILLING, AND PRINTING Flashcards
CAD:
CAM:
Computer Aided Designing
Computer Aided Manufacturing
DENTAL MILLING MACHINE
CLINIC RELATED FACTORS
(3)
q Milling Axis
q Dry and Wet Milling
q Functional Movement of Bur
I. MILLING AXIS
* DENTAL MILLING MACHINES CAN MILL VARIETY OF RESTORATION TYPES AND MATERIALS.
* MOST CHAIRSIDE MILLING MACHINES ARE —
* MOST LABORATORY MILLING MACHINES ARE —
4-AXIS MILL
5 OR MORE AXIS MILL
I. MILLING AXIS
* 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)
I. MILLING AXIS
* FOUR AXIS MILLING MACHINE
* 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.
I. MILLING AXIS
* FIVE AXIS MILLING MACHINE
* MILLING MACHINES WITH – OR MORE AXES CAN ROTATE THE MATERIAL BLOCK
IN ADDITIONAL AXES
* MILLING OF MORE COMPLEX DESIGNS – …
5
UNDERCUTS IN IMPLANT
SUPERSTRUCTURE
I. MILLING AXIS
* FIVE AXIS MILLING MACHINE
* 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.
FOUR AXIS MILL
* SPEED
* BLOCK SIZE
* UNDERCUT
* USAGE
FASTER IN SINGLE PRODUCT
MAX 80 X 16 MM
DISABLE
CROWN AND SHORT FPD
FIVE AXIS MILL
* SPEED
* BLOCK SIZE
* UNDERCUT
* USAGE
FASTER IN MULTIPLE PRODUCT
∅ 98.5 X 30MM
LIMITED
LONG FPD AND DENTURE
*(2) is not relevant with the axis
accuracy and resolution
II. DRY AND WET MILLING
* IN GENERAL, THE TYPE OF MATERIAL BEING MILLED DETERMINES WHETHER A MILL
SHOULD BE DRY OR WET.
* WET MILLING:
* DRY MILLING:
* BOTH DRY AND WET:
LITHIUM DISILICATE, FELDSPATHIC PORCELAINS, AND CHROME
COBALT METALS
WAX, SOME ACRYLIC, AND RESIN
ZIRCONIA, TITANIUM, AND SOME ACRYLIC
II. DRY AND WET MILLING
* THE LIQUID IN A WET MILL SERVES SEVERAL FUNCTIONS:
(3)
- 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)
II. DRY AND WET MILLING
* DRY MILLING DOES NOT USE LIQUID TO REMOVE SCRAP MATERIAL AWAY FROM THE
CUTTING SURFACE, BUT RATHER (2), OR A COMBINATION OF
BOTH.
* MAINTENANCE CLEANING IS STILL REQUIRED, AS A CONSIDERABLE AMOUNT OF
(2) ARE GENERATED WITH DRY MILLING.
* VACUUM SIZE, NOISE, AND OPERATING EXPENSE SHOULD ALL BE CONSIDERED
BEFORE MAKING A PURCHASE.
PRESSURIZED AIR, VACUUM
DUST AND SHAVINGS
III. FUNCTIONAL MOVEMENT OF BUR
* BUR MOVEMENT AT MILLING IS THE REVERSE OF ..
* A SUCCESSFUL TEETH PREPARATION SHOULD ..
TEETH PREPARATION.
FOLLOW THE MILLING PROCESS AND BUR
DIMENSION
A SUCCESSFUL TEETH PREPARATION SHOULD
FOLLOW THE …
MILLING PROCESS AND BUR
DIMENSION
III. FUNCTIONAL MOVEMENT OF BUR
1. MARGIN AT LEAST – WIDTH IN
DIMENSION OF THE BUR TIP’S SIZE.
2. CUSP AND FOSSA AT LEAST THE
— DIMENSION OF THE BUR TIP’S
SIZE.
3. PREPARED TEETH — AT
MOST THE BUR’S LENGTH.
½
SAME
HEIGHT
- MARGIN THICKNESS IS DEPENDS
ON BOTH THE (2) - TAPERING ANGLE DEPEND ON
…
BUR SIZE AND CROWN
MATERIAL.
THE BUR DESIGN (DISCUSS LATER)
CYLINDER POINTED BUR 12 S (— BUR)
OCCLUSION
I. CEREC MCX/MCXL
STEP BUR 12 S
CYLINDER POINTED BUR 12 S
Usage:
(3)
Crown / Onlay / Inlay
(E-max, Enamic, Certra Duo, Vita Mark II)
I. CEREC MCX/MCXL
STEP BUR 20
CYLINDER POINTED BUR 20 S
Usage:
(1)
Implant (Temp) Crown
(E-max, Telio Temp)
SHAPER 25 RZ (— BUR)
WILD CUTTING
FINISHER 10 (— BUR)
BRITTLE CUTTING
I. CEREC MCX/MCXL
SHAPER 25 RZ
FINISHER 10
Usage:
(4)
CEREC Surgical Guide / Temp Crown / Zirconia Crown / FPD
(CEREC Guide Bloc, Zirconia, Telio Temp)
TH E HEIG HT O F PREPA RA TIO N ;
This distance
should not
exceed —
12 mm
- THE WIDTH OF PREPARATION;
This width should
not be less than
—
1.0 mm
(0.8 -1.25 mm)
- TALL VERTICAL WALLS;
5 mm
Step bur 12 S
3 º
- TIGHT CORNERS;
RECOMMENDATION:
ENSURE CORNERS OF THE INTERNAL SURFACE
MARGIN HAVE GREATER THAN 1.0 MM
DIAMETER.
- “HOLY” ZONE (OVER MILL);
RECOMMENDATION:
ENSURE PREPARATION SHOULDERS AND
CUSPS ARE AT LEAST 1.0 MM IN
DIAMETER.
- MARGIN DESIGN;
RECOMMENDATION:
FINISH ALL MARGINS WITH A FINE OR
SUPERFINE DIAMOND. SO THAT ALL SMALL
DEFECTS, “BUR CHATTER” ETC., ARE REMOVED.
- MIN IM UM THIC KN ESS
— for isthmus
— internal line angles
1.5-2 mm
rounded
- UNDERCUTS.
Undercut
detected but will
not mill:
Undercut not
detected:
Open
margin
Not
seat
- UNDERCUTS.
Recommendation:
If undercuts cannot be
avoided during
preparation of the tooth,
avoid capturing undercuts
during the Optical
Impression stage. The
user may also rectify
situations like the one
shown here (right) by
changing the path of
insertion (“Design” >
“Insertion axis…”)
PREPARATION REQUIREMENTS
(5)
- SUFFIC IEN T TOOTH RED UC TIO N (ADEQUATE STRENGTH O F
MATERIALS); - ROUNDED IN TERN A L ANGLES (PA SSIVE SEA TIN G , PREVENTS
FRACTURES); - SM OOTH TAPERED W ALLS (GOOD IN TERN A L A D A PTA TIO N );
- CRISP W ELL -D EFIN ED M A RG IN S A ID IN M A RG IN D ETEC TIO N ;
- EXIT ANGLES AND M A RG IN S A PPRO A C HIN G 90 ̊ENSURES BULK O F
CERAMIC AT MARGIN FOR STRENGTH
In case of equigingival or subgingival margins, — is necessary
gingival
retraction
Check if there is (2) for the area that
you’re going to scan.
bleeding or swelling
3D PRINTING
DEFINITION
- 3D PRINTING OR ADDITIVE MANUFACTURING
TECHNOLOGIES CREATE THREE-DIMENSIONAL
PARTS FROM COMPUTER-AIDED DESIGN MODELS
BY SUCCESSIVELY ADDING MATERIAL LAYER BY
LAYER UNTIL PHYSICAL PART IS CREATED.
3D PRINTING TECHNOLOGIES
(3)
q Deposition Methods
q Polymerization Methods
q Sintering Methods
skipped
3D PRINTING MATERIALS
AVAILABLE IN DENTAL CLINIC
(7)
q DENTAL MODEL RESIN
q DENTAL PROTOTYPE RESIN
q DENTAL SURGICAL GUIDE RESIN
q DENTAL NIGHT GUARD RESIN
q DENTAL CASTABLE WAX RESIN
q DENTURES BASE/TEETH RESIN
q DENTURE METAL
(COBALT-CHROMIUM (CO-CR) ALLOYS)
