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8/3/2019 vishakha dalvi

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What is the full crown?

How many types of the full crown

are there? Whats the advantage of the metal

cast crown?

Which teeth need crowns? How are crowns done?


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A dental restoration that

completely reproduces the

clinical crown of a natural tooth


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Metal full crown

Non-metal full

crown


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Combinatorial crown


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Metal crown( posterior tooth)

Cast metal crown

Wrought metal crown

Computer aided design and

computer aided manufactory

( CAD/CAM ) metal crown


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Non-metal crown( posterior andanterior tooth)

resin crown

ceramic crown

Cast glass ceramic crown

CAD/CAM ceramic crown

Porcelain crown


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combinatorial crown (posterior andanterior tooth)

Porcelain fused to metal crown

Metal-resin crown


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Cast metal crown is a full crown

restoration which is cast with dental alloy.


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high Strength

tooth removed less

fitness

Long lasting

Fine protection


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Posteriortooth with large defect


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Malposition , torsoclusion or

malformation of posterior tooth.

Weak posterior abutment of removable

partial denture.


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Posterior retainer

of fixed partial

denture


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Posterior tooth after RCT ( Root

canal therapy.


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Incontrollable caries

People allergic to the metal

Tooth with esthetical requirement


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Residual root


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Material selection


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The position of gingival margin

of the crown

To reduce the occlusal force


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Occlusal reduction

Provide the adequate room for the

crown


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Occlusal surface

Amount of tooth

reduction1.0mm


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Essentials ofOcclusal preparation

Reduce theReduce the

inclination of cuspinclination of cusp


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Essentials ofOcclusal preparation

Prepare ladder on large filling material


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Buccal and lingual reduction

Provide the adequate room for the crown

Amount of tooth removing1.0mm


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Essentials of buccal and lingualEssentials of buccal and lingual

preparationpreparation

The functional cusp bevel preparationThe functional cusp bevel preparation


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Proximal reduction

Provide the adequate room for the crown

Amount of tooth removing1.0mm


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Essentials of axical preparationEssentials of axical preparation

Axial convergent angleAxial convergent angle 22~5~5


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The axial surface angel preparation

To keep the contour of the crown


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Cervical preparation

Chamfer or bevel

Width of shoulder

Non-noble metal0.5~0.8mm

Noble metal0.35~0.5mm


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Position of gingival margin

At the gingiva

1.0mm above gingiva

0.5~1.0mm under gingiva


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Finish

1.0mm

1.0

0.5 to 0.8


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An imprint of the teeth and

surrounding tissues, formed with a

plastic material to provide a mold for

use in making restorations


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Impression steps

Impression of opposite teeth

Impression of abutment

Bite Registration


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Gingival retractionGingival retraction

Retraction cordRetraction cord


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Impression procedure


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Impression method

Two step method

One step method


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Check the gingival

margin and tissular

surface of the

crown

Try in on the die


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Placement onto the abutment

Occlusal adjustment


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Pulp protection

Gingiva protection

Dental tissue protection


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Correct tool selection

Application of temporary crown

Occlusal adjustment


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Indications and contraindications

To improve the retention


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