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

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Presentation on theme: "Cast metal Full Crown , Cast metal Complete veneer crown Zhu ziyuan Staff Room of Prosthodontics."— Presentation transcript:

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  Posterior tooth with large defect Indications of metal crown

12  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

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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 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


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