Cast metal Full Crown ， Cast metal Complete veneer crown

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

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

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

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

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

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

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

32. 1.0mm 1.0 0.5 to 0.8 • Finish

33. 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

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

35. Gingival retraction • Retraction cord

36. Impression procedure

37. Impression method • Two step method • One step method

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

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

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

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

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