MOD ONLAYS

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MOD ONLAYS MOD ONLAYS INDICATIONS INDICATIONS Broken down teeth with intact Broken down teeth with intact buccal and lingual cusps buccal and lingual cusps MOD restorations with wide isthmus MOD restorations with wide isthmus As a post endodontic restoration As a post endodontic restoration To correct the occlusal plane of a To correct the occlusal plane of a tilted tooth tilted tooth

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dr shabeel p n. MOD ONLAYS. INDICATIONS Broken down teeth with intact buccal and lingual cusps MOD restorations with wide isthmus As a post endodontic restoration To correct the occlusal plane of a tilted tooth. CONTRA INDICATIONS. Patients with high caries rate Young patients - PowerPoint PPT Presentation

Transcript of MOD ONLAYS

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MOD ONLAYSMOD ONLAYSINDICATIONSINDICATIONS

• Broken down teeth with intact buccal and Broken down teeth with intact buccal and lingual cuspslingual cusps

• MOD restorations with wide isthmusMOD restorations with wide isthmus

• As a post endodontic restorationAs a post endodontic restoration

• To correct the occlusal plane of a tilted To correct the occlusal plane of a tilted tooth tooth

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CONTRA INDICATIONSCONTRA INDICATIONS

Patients with high caries ratePatients with high caries rateYoung patientsYoung patientsTeeth with short clinical crown heightTeeth with short clinical crown height

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INITIAL PREPARATIONINITIAL PREPARATION

1.1. OCCLUSAL REDUCTION OCCLUSAL REDUCTION FIRST STEP IS THE REDUCTION OF THE FIRST STEP IS THE REDUCTION OF THE

CUSPS WHICH IMPROVES THE CUSPS WHICH IMPROVES THE ACCESS AND VISIBILITY FOR SUBSEQUENT ACCESS AND VISIBILITY FOR SUBSEQUENT

STEPS IN TOOTH PREPARATION.STEPS IN TOOTH PREPARATION. EFFECIENCY OF THE CUTTING INSTRUMENT EFFECIENCY OF THE CUTTING INSTRUMENT

AND THE AIR-WATER COOLING SPRAY.AND THE AIR-WATER COOLING SPRAY. IT IS EASIER TO ASSESS THE HEIGHT OF THE IT IS EASIER TO ASSESS THE HEIGHT OF THE

REMAINING CLINICAL CROWN OF THE TOOTH. REMAINING CLINICAL CROWN OF THE TOOTH.

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USING THE NO.271 USING THE NO.271 CARBIDE BUR HELD CARBIDE BUR HELD PARALLEL TO THE PARALLEL TO THE LONG AXIS OF THE LONG AXIS OF THE CROWN, PREPARE 2 CROWN, PREPARE 2 mm DEEP PULPAL mm DEEP PULPAL FLOOR ALONG THE FLOOR ALONG THE CENTRAL GROOVE.CENTRAL GROOVE.

THE OCCLUSAL THE OCCLUSAL PREPARATION IS PREPARATION IS EXTENDED FACIALLY EXTENDED FACIALLY AND LINGUALLY JUST AND LINGUALLY JUST BEYOND THE CARIES BEYOND THE CARIES TO SOUND TOOTH TO SOUND TOOTH STRUCTURE, TO STRUCTURE, TO VERIFY NEED FOR VERIFY NEED FOR CUSP CAPPING.CUSP CAPPING.

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WITH THE SIDE OF WITH THE SIDE OF THE NO.271 CARBIDE THE NO.271 CARBIDE BUR, PREPARE BUR, PREPARE UNIFORM 1.5 mm UNIFORM 1.5 mm DEEP DEPTH CUTS ON DEEP DEPTH CUTS ON THE REMAINING THE REMAINING OCCLUSAL SURFACE. OCCLUSAL SURFACE. THEY ARE USUALLY THEY ARE USUALLY PLACED ON THE PLACED ON THE CREST OF THE CREST OF THE TRIANGULAR RIDGES TRIANGULAR RIDGES AND IN THE FACIAL AND IN THE FACIAL AND LINGUAL AND LINGUAL GROOVE REGIONS.GROOVE REGIONS.

THE DEPTH CUTS THE DEPTH CUTS SERVES AS GUIDES SERVES AS GUIDES FOR THE AMOUNT OF FOR THE AMOUNT OF REDUCTION.REDUCTION.

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CUSP REDUCTION IS CUSP REDUCTION IS COMPLETED WITH THE COMPLETED WITH THE SIDE OF THE NO.271 BUR, SIDE OF THE NO.271 BUR, AND THE REDUCTION AND THE REDUCTION SHOULD REFLECT THE SHOULD REFLECT THE GENERAL TOPOGRAPHY OF GENERAL TOPOGRAPHY OF THE ORIGINAL OCCLUSAL THE ORIGINAL OCCLUSAL SURFACE.SURFACE.

SHOULD NOT ATTEMPT TO SHOULD NOT ATTEMPT TO REDUCE THE MESIAL AND REDUCE THE MESIAL AND DISTAL MARGINAL RIDGES DISTAL MARGINAL RIDGES AT THIS TIME( TO AVOID AT THIS TIME( TO AVOID HITTING ADJACENT HITTING ADJACENT TOOTH).TOOTH).

THE GINGIVAL-TO-THE GINGIVAL-TO-OCCLUSAL DIVERGENCE OCCLUSAL DIVERGENCE OF THESE PREPARATION OF THESE PREPARATION WALLS SHOULD RANGE WALLS SHOULD RANGE FROM 2-5 degrees FROM 2-5 degrees DEPENDING ON THEIR DEPENDING ON THEIR HEIGHTS. HEIGHTS.

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2. 2. OCCLUSAL STEPOCCLUSAL STEP AFTER CUSP REDUCTION, AFTER CUSP REDUCTION,

THERE SHOULD BE A 0.5 mm THERE SHOULD BE A 0.5 mm DEEP OCCLUSAL STEP IN DEEP OCCLUSAL STEP IN THE CENTRAL GROOVE THE CENTRAL GROOVE REGION BETWEEN THE REGION BETWEEN THE REDUCED CUSPAL INLCINES REDUCED CUSPAL INLCINES AND THE PULPAL FLOOR.AND THE PULPAL FLOOR.

OCCLUSAL STEP IS OCCLUSAL STEP IS EXTENDED EXTENDED FACIALLY AND LINGUALLY FACIALLY AND LINGUALLY BEYOND THE CARIOUS BEYOND THE CARIOUS AREASAREAS AND THE WALLS SHOULD AND THE WALLS SHOULD GOGO AROUND THE CUSPS IN AROUND THE CUSPS IN GRACEFUL CURVES THEN GRACEFUL CURVES THEN EXTENDED MESIALLY AND EXTENDED MESIALLY AND DISTALLY TO EXPOSE THE DISTALLY TO EXPOSE THE PROXIMAL DEJ IN PROXIMAL DEJ IN ANTICIPATIONANTICIPATION OF PROXIMAL BOXING. OF PROXIMAL BOXING.

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3. 3. PROXIMAL BOXPROXIMAL BOX CONTINUING WITH NO.271 CARBIDE BUR A CONTINUING WITH NO.271 CARBIDE BUR A

PROXIMAL DITCHPROXIMAL DITCH IS PREPARED. IS PREPARED. THE MESIODISTAL WIDTH OF THE DITCH SHOULD THE MESIODISTAL WIDTH OF THE DITCH SHOULD

BE 0.8 mm AND PREPARED APPROX. TWO-THIRDS BE 0.8 mm AND PREPARED APPROX. TWO-THIRDS AT THE EXPENSE OF DENTIN AND ONE-THIRD OF AT THE EXPENSE OF DENTIN AND ONE-THIRD OF ENAMEL.ENAMEL.

IDEAL EXTENSION GINGIVALLY OF A MINIMAL IDEAL EXTENSION GINGIVALLY OF A MINIMAL CAVITATED LESION ELIMINATES CARIES ON THE CAVITATED LESION ELIMINATES CARIES ON THE GINGIVAL FLOOR AND PROVIDES 0.5 mm GINGIVAL FLOOR AND PROVIDES 0.5 mm CLEARANCE OF THE UNBEVELED GINGIVAL MARGIN CLEARANCE OF THE UNBEVELED GINGIVAL MARGIN WITH THE ADJACENT TOOTH.WITH THE ADJACENT TOOTH.

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FINAL PREPARATIONFINAL PREPARATION

1.1. REMOVAL OF THE REMOVAL OF THE INFECTED INFECTED CARIOUS DENTIN CARIOUS DENTIN AND DEFECTIVE AND DEFECTIVE RESTORATIVE RESTORATIVE MATERIALS ON MATERIALS ON THE PULPAL AND THE PULPAL AND AXIAL WALLS. AXIAL WALLS.

A CEMENT A CEMENT BASE CAN BE GIVEN BASE CAN BE GIVEN IF IT IS INDICATED.IF IT IS INDICATED.

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2.2. PREPARATION OF PREPARATION OF BEVELS AND BEVELS AND FLARES.FLARES.

A DIAMOND A DIAMOND INSTRUMENT IS INSTRUMENT IS USED TO PLACE USED TO PLACE COUNTER BEVELSCOUNTER BEVELS ON THE REDUCED ON THE REDUCED CUSPS, TO APPLY CUSPS, TO APPLY GINGIVAL BEVELSGINGIVAL BEVELS AND TO CREATE AND TO CREATE SECONDARY FLARESSECONDARY FLARES ON THE FACIAL AND ON THE FACIAL AND LINGUAL WALLS OF LINGUAL WALLS OF THE PROXIMAL THE PROXIMAL BOXES. BOXES.

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FISSURE THAT FISSURE THAT EXTENDS SLIGHTLY EXTENDS SLIGHTLY LINGUAL TO LINGUAL TO NORMAL POSITION NORMAL POSITION OF COUNTER OF COUNTER BEVEL MAY BE BEVEL MAY BE INCLUDED BY INCLUDED BY SLIGHTLY SLIGHTLY DEEPENING DEEPENING COUNTER BEVEL IN COUNTER BEVEL IN FISSURED AREA.FISSURED AREA.

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AFTER BEVELILNG AFTER BEVELILNG AND FLARING AND FLARING SHARP JUNCTIONS SHARP JUNCTIONS BETWEEN THE BETWEEN THE COUNTER BEVELS COUNTER BEVELS AND THE AND THE SECONDARY SECONDARY FLARES ARE FLARES ARE ROUNDED ROUNDED SLIGHTLY. SLIGHTLY.

LIGHTLY BEVEL LIGHTLY BEVEL AXIOPULPAL LINE AXIOPULPAL LINE ANGLE ALSO.ANGLE ALSO.

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IF NECESSARY, IF NECESSARY, SHALLOW( 3 mm SHALLOW( 3 mm DEEP) DEEP) RETENTION RETENTION GROOVESGROOVES MAY BE MAY BE CUT IN THE CUT IN THE FACIOAXIAL AND FACIOAXIAL AND THE LINGOAXIAL THE LINGOAXIAL LINE ANGLES WITH LINE ANGLES WITH NO.169 L CARBIDE NO.169 L CARBIDE BUR. BUR.

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COMPLETED MESIO OCCLUSO COMPLETED MESIO OCCLUSO DISTAL ONLAY PREPARATIONDISTAL ONLAY PREPARATION