Porcelain Veneers Flashcards
Name the two types of porcelain veneers
Slice and conventional prep
What are the indications for a slice prep (5)
Crowding, diastema, missing interdental papillae, interproximal restorations and movement of teeth
How many planes of preparation in a anterior veneer
3
What are the differences between conventional good enamel and poor enamel prep
Poor enamel : prep 0.5 depth chamfer 1mm down the palalatal
Good enamel: but joint sloping or 90 degrees
How do you assess good enamel for a veneer
- Bruxism
- Is the tooth in guidance
- Quality of labial enamel
- Whether ip Restorations
What is a Geller model
Stone die placed in a plastic model to ensure the emergence profile of veneers is correct . (Able to trim papillae )
What is tye axial inclination of a conventional veneer
10-15
What is the convergence angle of a porcelain veneer
20-30
What is the labial reduction for a empress crown
0.75-1mm
If a tooth has ip Restorations and is in guidance what type of veneer is required
Slice with Palatal prep
What is the the incisal edge reduction required for a porcelain veneer
2mm
What would be the preparation of a conventional veneer at the gingival margin of an upper central
0.3mm
What depth should a Palatal mini chamfer be
0.5mm
When creating a conventional veneer What depth should be achieved ip
Cut through ip approx 1mm in depth (nick the corners only not through the contact point )
When would you place a Palatal chamfer on a veneer
The tooth is in anterior guidance and has poor labial enamel
When preparing a conventional veneer which has no anterior guidance and good labial enamel what is the incisal edge reduction
2mm
When prepping an upper right 2 for a veneer What depth should it be at the gingival margin
0.35mm
What is the ip prep required for a slice preparation
0.5mm
For a slice preparation what is the incisal edge reduction required
2mm
What is the labial reduction used for a feldspathic crown
0.5mm
When carrying out a porcelain conventional veneer how far in to the contact point do you want to prep
1/2 to a 1/3rd
In order for a slice prep to influence the papillae where do the ip margins need to be
At least 0.5mm below the papillae
Why is it preferable to use addition cure light and medium body impression material
More accurate
Able to get more pours from the material
