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?

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

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

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

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

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

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

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

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

Indications of metal crown Posterior tooth with large defect

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

Posterior retainer of fixed partial denture

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

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

Contraindications of metal crown Residual root

Design of metal crown Material selection

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

Tooth preparation Occlusal reduction： Provide the adequate room for the crown

Tooth preparation Occlusal surface： Amount of tooth reduction：1.0mm

Essentials of Occlusal preparation Reduce the inclination of cusp

Essentials of Occlusal preparation Prepare ladder on large filling material

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

Essentials of buccal and lingual preparation The functional cusp bevel preparation

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

Essentials of axical preparation Axial convergent angle 2°~5°

The axial surface angel preparation To keep the contour of the crown

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

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

Finish 1.0mm 1.0 0.5 to 0.8

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

Impression steps Impression of opposite teeth Impression of abutment Bite Registration

Gingival retraction Retraction cord

Impression procedure

Impression method Two step method One step method

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

Try in of metal crown Placement onto the abutment Occlusal adjustment

Essentials Pulp protection Gingiva protection Dental tissue protection

Essentials Correct tool selection Application of temporary crown Occlusal adjustment

Essentials Indications and contraindications To improve the retention