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Cast metal Full Crown , Cast metal Complete veneer crown

Cast metal Full Crown , Cast metal Complete veneer crown. Zhu ziyuan Staff Room of Prosthodontics. Contents. What is the full crown? How many types of the full crown are there? What’s the advantage of the metal cast crown? Which teeth need crowns? How are crowns done?.

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Cast metal Full Crown , Cast metal Complete veneer crown

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  1. Cast metal Full Crown,Cast metal Complete veneer crown Zhu ziyuan Staff Room of Prosthodontics

  2. Contents • What is the full crown? • How many types of the full crown are there? • What’s the advantage of the metal cast crown? • Which teeth need crowns? • How are crowns done?

  3. What is the full crown • A dental restoration that completely reproduces the clinical crown of a natural tooth

  4. Types of the crown • Metal full crown (金属全冠) • Non-metal full crown (非金属全冠)

  5. Types of the crown • Combinatorial crown (金属—非金属混合全冠)

  6. Metal crown( posterior tooth) • Cast (铸造) metal crown • Wrought (锤造)metal crown • Computer aided design and computer aided manufactory( CAD/CAM )metal crown

  7. Non-metal crown( posterior and anterior tooth) • resin crown • ceramic crown • Cast glass ceramic crown • CAD/CAM ceramic crown • Porcelain crown

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

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

  10. Advantages of cast metal crown • high Strength • tooth removed less • fitness • Long lasting • Fine protection

  11. Indications of metal crown • Posterior tooth with large defect

  12. Indications of metal crown • Malposition (错位), torsoclusion (扭转)or malformation of posterior tooth(形态不良) • Weak posterior abutment (基牙) of removable partial denture

  13. Posterior retainer of fixed partial denture

  14. Posterior tooth after RCT ( Root canal therapy 根管治疗)

  15. Contraindications of metal crown • Incontrollable caries • People allergic to the metal • Tooth with esthetical requirement

  16. Contraindications of metal crown • Residual root

  17. Design of metal crown • Material selection

  18. Design of metal crown • The position of gingival margin of the crown • To reduce the occlusal force

  19. Tooth preparation • Occlusal reduction: • Provide the adequate room for the crown

  20. Tooth preparation • Occlusal surface: • Amount of tooth reduction:1.0mm

  21. Essentials of Occlusal preparation • Reduce the inclination of cusp

  22. Essentials of Occlusal preparation • Prepare ladder on large filling material

  23. Buccal and lingual reduction: • Provide the adequate room for the crown • Amount of tooth removing:1.0mm

  24. Essentials of buccal and lingual preparation • The functional cusp bevel preparation

  25. Proximal reduction: • Provide the adequate room for the crown • Amount of tooth removing:1.0mm

  26. Essentials of axical preparation • Axial convergent angle 2°~5°

  27. The axial surface angel preparation • To keep the contour of the crown

  28. Cervical preparation • Chamfer or bevel • Width of shoulder • Non-noble metal:0.5~0.8mm • Noble metal:0.35~0.5mm

  29. Position of gingival margin • At the gingiva • 1.0mm above gingiva • 0.5~1.0mm under gingiva

  30. 1.0mm 1.0 0.5 to 0.8 • Finish

  31. 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

  32. Impression steps • Impression of opposite teeth • Impression of abutment • Bite Registration

  33. Gingival retraction • Retraction cord

  34. Impression procedure

  35. Impression method • Two step method • One step method

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

  37. Try in of metal crown • Placement onto the abutment • Occlusal adjustment

  38. Essentials • Pulp protection • Gingiva protection • Dental tissue protection

  39. Essentials • Correct tool selection • Application of temporary crown • Occlusal adjustment

  40. Essentials • Indications and contraindications • To improve the retention

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