China Nickel and Chromium Alloy Dental Crown Lab, Full Cast Metal Crown High Strength, Find details about China Pfm, Dental from Nickel and Chromium Alloy Dental Crown Lab, Full Cast Metal Crown High Strength
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
Try in on the die
Placement onto the abutment
Occlusal adjustment
Essentials
Pulp protection
Gingiva protection
Dental tissue protection
Correct tool selection
Application of temporary crown
Occlusal adjustment
Indications and contraindications