Cast metal Full Crown,Cast metal Complete veneer crown

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Cast metal Full Crown,Cast metal Complete veneer
crown

• Zhu ziyuan
• Staff Room of Prosthodontics

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Contents

• 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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What is the full crown

• A dental restoration that completely reproduces
  the clinical crown of a natural tooth

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Types of the crown

• Metal full crown
• (????)
• Non-metal full crown
• (?????)

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Types of the crown

• 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 and anterior tooth)
• resin crown
• ceramic crown
• Cast glass ceramic crown
• CAD/CAM ceramic crown
• Porcelain crown

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• combinatorial crown (posterior and anterior
  tooth)
• Porcelain fused to metal crown
• Metal-resin crown

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Definition of cast metal crown

• Cast metal crown is a full crown restoration
  which is cast with dental alloy.

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Advantages of cast metal crown

• high Strength
• tooth removed less
• fitness
• Long lasting
• Fine protection

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Indications of metal crown

• Posterior tooth with large defect

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Indications of metal crown

• 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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Contraindications of metal crown

• Incontrollable caries
• People allergic to the metal
• Tooth with esthetical requirement

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Contraindications of metal crown

• Residual root

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Design of metal crown

• Material selection

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Design of metal crown

• The position of gingival margin of the crown
• To reduce the occlusal force

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Tooth preparation

• Occlusal reduction
• Provide the adequate room for the crown

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Tooth preparation

• Occlusal surface
• Amount of tooth reduction1.0mm

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• Essentials of Occlusal preparation

• Reduce the inclination of cusp

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• Essentials of Occlusal 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 lingual preparation
• The 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 preparation
• Axial convergent angle 25

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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 metal0.50.8mm
• Noble metal0.350.5mm

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• Position of gingival margin
• At the gingiva
• 1.0mm above gingiva
• 0.51.0mm under gingiva

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• Finish

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Impression of metal crown

• 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 retraction
• Retraction cord

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• Impression procedure

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• Impression method
• Two step method
• One step method

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Try in of metal crown

• Check the gingival margin and tissular surface of
  the crown
• Try in on the die

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Try in of metal crown

• Placement onto the abutment
• Occlusal adjustment

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Essentials

• Pulp protection
• Gingiva protection
• Dental tissue protection

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Essentials

• Correct tool selection
• Application of temporary crown
• Occlusal adjustment

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Essentials

• Indications and contraindications
• To improve the retention