Popular Nickel and Chromium Full Cast Metal Crown ISO9001/200
What's a Full Cast Metal Crown?
Cast Metal crown is a full crwon restoration which is cast with dental alloy.
Advantages
- High Strength
- Tooth reomoved less
- Fitness
- Long lasting
- Fine protection
Disadvantages
- Inaesthetic
- Metal easy lead to allergy
Indication
- Posterior tooth with Large defect
- Malposition, Torsoclusion or malformation of posterior tooth
- Weak posterior abutment of removable partial denture
- Posterior retiner of fixed partial denture
- Posterior tooth after RCT ( Roogt Canal Therapy)
Contraindications
- Incontrollable caries
- People allergic to the metal
- Tooth with esthetical requirment
- Residual root
Design of Metal Crown
- Material Selection
- The position of gingiva margin of the crown
- To reduce the occlusal force
Tooth Preparation
1) Occlusal Reduction
- Provide the adequate room for the crown
- Occlusal Surface
- Amout of tooth reduction : 1.0MM
2) Essentials of Occlusal Preparation
- Reduce the inclination of cusp
- Prepare ladder on large filling material
3) Buccal and lingual reduction
- Provided the adequate room for the crown
- Amount of tooth removing: 1.0MM
4) Essential of buccal and lingual
- Preparation
- The functional cusp level preparation
5)Proxiaml redcuction
- Provide the adequate room for the crown
- Amount of tooth removing:1.0MM
6) Essentials of Axical Preparation
- Axical convergent angle 2-5 degree
- The axical surface agngle preparation to keep the contour of the crown
7)Cervical Preparation
- Chamfer or bevel
- Width of shoulder
- Non- Noble metal :0.5-0.8MM
- Noble Metal: 0.35-0.5MM
8)Position of Gingival Margin
- At the gingiva
- 1.0mm above gingiva
- 0.5-1.0mm under gingiva
Impression of Metal Crown
An imprint of the teeth and surrounding tissues formed with a plastic matereial to provide a mold for use in malering restoration
Impression step
- Impression of opposite tooth
- Impression of abutment
- Bite Registraion
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
- Tr
