Metal Ceramic Restoration by Bhawani Chandra

transcript

METAL CERAMIC CROWNS

BHAWANI CHANDRA

070301186 ,Final BDS,

MCODS,MANIPAL

Okkkkk so here it goes …..’’Crown preparation is where you grind the tooth down so that you can put a cap on the tooth ‘’!!!!

just a little of 49 slices ….without butter….

…..and as they say dentistry requires ……………………………………patience…..

METAL-CERAMIC

ALSO CALLED PORCELAIN FUSED TO METAL RESTORATION (PFM).

CONSISTS OF A CERAMIC LAYER BONDED TO A THIN CAST METAL COPING THAT FITS OVER THE TOOTH PREPARATION.

METAL CERAMIC

COMBINES THE STRENGTH AND ACCURATE FIT OF A CAST RESTORATION WITH THE COSMETIC EFFECT OF A CERAMIC CROWN.

METAL-CERMIC

WITH THE METAL UNDERSTRUCTURE,METAL-CERAMIC RESTORATIONS HAVE GREATER STRENGTH THAN RESTORATIONS MADE OF CERAMIC ALONE.

METAL-CERMIC

CAN BE USED IN A WIDE VARIETY OF SITUATIONS INCLUDING THE REPLACEMENT OF MISSING TEETH WITH FPD’S.

METAL-CERMIC IS A COMBINATION OF METAL AND CERAMIC, THE TOOTHPREPARATION IS ALSO COMBINATION OF DEEPREDUCTION FACIALLY AND SHALLOWER REDUCTION LINGUALLY.THERE MAY BE A WING ON EACH PROXIMAL SURFACE WHERE THE DEEP REDUCTION ENDS AND THE SHALLOWER PROXIMALREDUCTION BEGINS.

METAL-CERMIC

ADEQUATE REDUCTION IS ESSENTIAL FOR ACHIEVING A GOOD ESTHETIC RESULT.

METAL-CERMIC WHEN THERE IS INADEQUATE SPACE FOR A SUFFICIENT THICKNESS OF CERAMIC MATERIAL 1. POORLY CONTOURED

RESTORATION AFFECTING BOTH ESTHETIC AND HEALTH OF THE SURROUNDING GINGIVA.

METAL-CERMIC

2.THE SHADE AND TRANSLUCENCY OF THE RESTORATION WILL NOT MATCH THE ADJACENT NATURAL TEETH.

ANTERIOR METAL CERAMIC

ANTERIOR METAL-CERAMIC CROWNS

A UNIFORM REDUCTION OF APPROXIMATELY 1.2MM IS NEEDED OVER THE ENTIRE FACIAL SURFACE.

TO ACHIEVE ADEQUATE REDUCTION WITHOUT ENCROACHING UPON THE PULP ,FACIAL SURFACE

IS PREPARED IN TWO PLANES THAT CORRESPOND ROUGHLY TO THE TWO GEOMETRIC PLANES PRESENT ON THE FACIALSURFACE OF AN UNCUT TOOTH

ARMAMENTARIUM

1. LAB KNIFE WITH NO:25 BLADE

2. SILICONE PUTTY3. ROUND – END TAPERED

DIAMOND4. SMALL WHEEL DAIMOND5. LONG NEEDLE DAIMOND6. RADIAL FISSURE BUR

(ROUNDED SHOULDER)7. MODIFIED BINANGLE

CHISEL

SILICONE INDEX IS MADE BEFORE THE TOOTH PREPARATION.

WHEN TOOTH IS BADLY BROKEN DOWN,THEN INDEX IS MADE ON WAXED UP DIAGNOSTIC CAST.

ANTERIOR METAL-CERAMIC CROWN PREPARATION

STEP NO : 1PLACEMENT OF DEPTH ORIENTATION GROOVES - ( 1.2MM )THE LABIAL GROOVES CUT IN TWO SETS1. ONE SET PARALLEL

WITH THE GINGIVAL HALF OF LABIAL SURFACE

2. ONE SET PARALLEL WITH THE INCISAL HALF OF LABIAL SURFACE

STEP NO : 2INCISAL REDUCTION- (2MM)ROUND –END TAPERED DAIMOND.

INADEQUATE INCISAL REDUCTION RESULTS IN POOR INCISAL TRANSLUCENCY.

STEP NO : 3LABIAL REDUCTION(INCISAL HALF)ROUND- END TAPERED DAIMOND.

STEP NO :4LABIAL REDUCTION(GINGIVAL HALF)ROUND-END TAPERED DAIMOND

STEP NO : 5LINGUAL REDUCTION(0.7 -1MM )SMALL WHEEL DAIMOND.

STEP NO :6INITIAL PROXIMAL REDUCTIONLONG NEEDLE DAIMOND

STEP NO : 7LINGUAL AXIAL REDUCTIONROUND - END TAPERED DAIMOND.

STEP NO : 8SMOOTHENING THE SHARP ANGLES

FACIAL MARGIN1. DEEP CHAMFER2. SHOULDER WITH BEVEL3. SHOULDER4. RADIAL SHOULDER

DEEP (HEAVY ) CHAMFER

PROVIDE 90-DEGREE CAVOSURFACE ANGLE WITH A LARGE –RADIUS ROUNDED INTERNAL ANGLE.

RADIAL SHOULDER

MODIFIED FORM OF SHOULDERSMALL RADIUS INTERNAL ANGLE WITH 90-DEGREE CAVOSURFACE

SHOULDER WITH BEVEL

USUALLY THISDESIGN CAN BE USED IN WHEREGINGIVAL ESTHETICSARE NOT CRITICAL.

IMPROVED ESTHETICS

ALL CERAMIC LABIAL MARGIN

THIS ELIMINATES THE METAL COLLAR AT THE FACIOGINGIVAL MARGIN OF THE FINISHED METAL-CERAMIC RESTORATION

IMPROVED ESTHETICS

ALL CERAMIC LABIAL MARGIN

THIS ELIMINATES THE METAL COLLAR AT THE FACIOGINGIVAL MARGIN OF THE FINISHED METAL-CERAMIC RESTORATION

POSTERIOR METAL CERAMIC CROWN

POSTERIOR METAL-CERAMIC CROWNS

STEP NO : 1OCCLUSAL REDUCTION FOLLOWED BY FUNCTIONAL CUSP BEVEL

STEP NO : 2DEPTH ORIENTATIONGROOVES

STEP NO :3FACIAL REDUCTION-OCCLUSAL HALF

POSTERIOR METAL-CERAMIC CROWN

STEP NO :4

FACIAL REDUCTIONGINGIVAL HALF

STEP NO: 5

PROXIMAL AXIAL REDUCTION

STEP NO :6

LINGUAL AXIAL REDUCTION

STEP NO : 7

AXIAL FINISHING

STEP NO :8

GINGIVAL BEVEL

REFERENCES………….1.GOOOOGLE SEARCH IMAGES….2.3.

Metal Ceramic Restoration by Bhawani Chandra

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