Pontics Flashcards
How many mm of bone can be lost following extraction?
6-7 mm
When should you mention grafting therapy when extracting a tooth?
Before extraction
What class of eruption involves loss of FL width only (32%)?
Class 1
What class of eruption involves loss of OG height only (3%)?
Class 2
What class of eruption involves loss of FL width and OG height (56%)?
Class 3
What class of eruption involves no loss of bone (8%)?
Normal
What are the dimensions of the Edentulous space? What are the positions of the abutment teeth? What is the occlusion likely to be? Is there a need to reposition the teeth orthodontically? \_\_\_\_\_\_\_ up is key to answer these questions before you begin treatment
Diagnostic Wax
T/F: When two materials are
used, the finish line for their
joining should not be on
the edentulous ridge.
True
Ideally, a pontic should have the _____ inciso-gingival height as the original or
same
T/F: When resorption of the bone has taken place, the pontic changes shape in order to
keep in contact with the ridge concavity
True
Contour needs to be blended ______ to avoid a ledge at the cervical.
smoothly
T/F: When the pontic does not adapt well, esthetics, speaking, and food impaction can
become troublesome
True
What type of tissue should the pontic be placed over?
Keratinized tissue
If tissue is non-keatinized, should the pontic contact?
No!
Contact with the tissue should be minimal. Pontic shape in contact with tooth should also be
_______
convex
Pontics placed \_\_\_\_\_\_ of the inter-abutment axis creates torque on the connectors and abutments which can lead to failure
outside
Recall that _______ is the biggest reason why we see mechanical failure in
bridgework. So replacing as ideal occlusion as possible extends the life of the
restoration.
occlusion
_____ pontic design:
- Also known as a Saddle pontic
- Not used any longer
- Forms a large CONCAVE contact area with ridge
- Patient not able to clean
- Creates tissue inflammation leading to tissue ischemia and necrosis
Ridge Lap
\_\_\_\_\_\_ pontic design -Also known as Sanitary Pontic -No contact with Ridge -at least 2-3mm of space between the ridge and the pontic -Patient can easily clean without the pontic being a food trap -Only for use in non-esthetic areas -Design and shape is CONVEX in all directions.
Hygenic Pontic
\_\_\_\_\_\_ pontic design To increase strength of bridge in connectors with hygenic pontic Deflection is increased with less occlusal gingival height. So, lets beef up those connectors!
Modified Hygenic pontic
\_\_\_\_\_ pontic design -Passive contact with ridge crest -Rounded and cleansable -Triangular embrasure space can trap food -Best suited for thin mandibular ridges -Also not best for esthetic areas.
Conical Pontic
_____ pontic design
- Passive contact facial side of ridge crest
- Can appear very esthetic
- Convex tissue surface contact
- Used frequently in the esthetic areas.
- Shape can help keep food from trapping
- Cleansability much easier for patients
Modified Ridge Lap
\_\_\_\_\_ pontic design Convex in all directions except for a small concavity on the lingual side of the facial-gingival aspect of the pontic Contact area is meant to be minimal Lingual side needs to be smooth and highly polished Tissue contact ok but should not put pressure on the tissue. Keep tissue contact on Keratinized tissue Tissue contact shape is ideally shaped like a T.
Modified ridge lap design
_____ pontic design
Blunt rounded Pontic shape that is set into a
concavity in the tissue of the edentulous ridge
Generally requires planning
-Pre-Prosthetic surgery via immediate
provisionalization after extraction
-Surgery/modification with provisional to
develop tissue shape and contour
-Ovate Pontics keep a slight pressure on the
tissue to maintain the effect of
emerging from the ridge
Cleansable by well educated and motivated
patients
Highly Esthetic
Ovate pontic
SHould gingiva shape be u shaped or v shaped?
U shaped
SHould the connectors be shaped concave or convex?
Concave
If you increase connector height, you ____ strength of FPD
Increase
Anterior connectors are placed more _____
for esthetics
lingually
Anterior connectors are longer or shorter inciso-gingivally
for strength
longer
Connector size for all ceramic is at least ___mm and possibly needs to
be larger
4
\_\_\_\_\_ soldering Uniting components of the same alloy BEFORE porcelain is fired. Uses high-fusing solder Melt solder with a torch Solder has lower melting temp than alloy, but higher melting temp than porcelain firing temperature Less Technique Sensitive
Pre-Ceramic Veneer Soldering
_______ soldering
Uniting components of the same alloy AFTER
porcelain is fired
Uses low-fusing solder
Melt solder in oven
Solder has lower melting temp than alloy and
porcelain
More Technique sensitive
*Can compensate for slight discrepancies or
distortions that occur AFTER the porcelain is
fired.
*Porcelain can crack in area of solder joint
during solder process
Post-Ceramic Veneer Soldering
When would you use Post-Ceramic Veneer Soldering?
Not often
– Adding material to contact area Smoothing and shaping contact area Voila! Contact! Can add contacts to Zirconia too but not to Lithium Disilicate
Addition Soldering
