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. Finish
1.0mm
1.0
0.5 to 0.8

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