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Crown and Bridge Lecture
Transcript
COPING DESIGN
• Think of your wax coping as the foundation of a building- the base layer
• If properly designed and executed you can build floors upon floors
• If improperly designed and unsupported, the building will collapse
Price Point:
Types of PFM Crowns
•Anywhere between $250-$450 (+ metal) depending on the lab
•Attracts technicians because of its market value
•Not volume based (i.e. orthodontics)
•Dollar signs irrelevant if your coping substructure can’t support your porcelain
1.Porcelain fused to High Noble
2.Porcelain fused to Semi-Precious
3.Porcelain fused to Non-precious
Substructure Design:
Reason For PFM Crown and Bridges
• Esthetics= No orthodontic treatment
• Crack line in the tooth that runs deep = pain
• Portion of tooth fractures
• Need to anchor bridge
•Cast substructure provides fit for tooth
• Bonds to porcelain
• Foundation to which brittle porcelain is attached for necessary strength and support
• Coping restores the proper emergence profile
of the patient's natural tooth
PFM: How Do We Get There?
Doc makes prep and
sends impression
Pour the mold and prepare
the model and dye
Wax Up Design For Single Unit PFM
Wax up a substructure
What We Have Learned
• Have to place the wax accordingly with the finish product in mind
Invest and burnout the ring
[Cheat note: draw the finishing lines on your model]
•What a PFM crown is
•Why it is universally used
•Proper design and thickness
•How to NOT be this guy...
Cast the waxed substructure in metal
• Coping should be between .3mm-.5mm
• Less than .3mm is dangerous for support
• More than .5mm will not allow for adequate design of the porcelain
Trim and polish the substructure
Apply porcelain to the coping
Final product is known as a PFM
• Angles, edges, undercuts must be avoided as porcelain cracks at corners
• No area of the wax/metal should leave the porcelain without proper support
• Total thickness of a single unit should be between 1.5-2mm thick maximum
RECAP:
What Does 'PFM' Stand For?
- Discussed the importance of tooth preparation design, model work, articulation, spot grinding, and margins
• Porcelain Fused to Metal Crown
• Majority of crowns done this way in today’s labs
- Essential in crown and bridge and begin to lay the proper foundation for which to build upon
• New techniques in the market
(i.e. cad/cam, pressables)
• Traditional method and what we need for learning foundation
- Fundamental principles of crown and bridge begin when we start to discuss proper design and SUPPORT porcelain
So, How Do You Get
To Be That Guy?
- Listen
- Understand
- Apply
• Lesson Objective:
Grasp the concept of what a PFM is,
what a coping is, and how it should
look with sufficient support
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