Pros Flashcards
porosity in PFM
inadequate condensation
What is the weakest porcelain?
Feldspathic porcelain
Best material to oppose a porcelain crown?
porcelain
What turns a PFM green?
silver
what component makes a PFM green in the cervical 1/3
copper
What is function of opaque porcelain EXCEPT:
- mask metal framework
- to help come up with a base/stump shade
- for initial bond to metal
- to decrease contamination of additional porcelain with metal in ensuing firing and baking procedures
to decrease contamination of additional porcelain with metal in ensuing firing and baking procedures
fact: Pt had veneers cemented with light cured resin. Now comes back few weeks later with
brown staining at gingival margins. Why?
Chromogenic bacteria
fact: Pt had veneers cemented with light cured resin. Now comes back few weeks later with
brown staining at gingival margins. Why?
Chromogenic bacteria
How much tooth structure needs to removed on the facial for a porcelain veneer?
___ mm
0.5 mm
order of what you do if veneer fractures:
mice, etch, microetch, etch, microabrasion,
silane
What do you use to cement a veneer?
• Resin cement
• Polyacrylic
resin cement
minimum incisal reduction in anterior PFM
2mm
Pt has veneers from 6-11, which fluoride do you use to not stain?
A. Stannous Flouride
B. Sodium Flouride
C. Acid Flouride
Sodium Flouride
10 crown on a patient is PFM. It looks longer than #7. All of the following maybe the
reason why the crown looks like this, except?
– Incorrect shade.
– insufficient tooth prep
– too think metal
– too thick porcelain
incorrect shade
Most common reason for PFM bridge breakage?
Firing schedule,
high contact,
inadequate design
inadequate design
What prevents lingual displacement of a ¾ crown?
a. lingual wall of grooves
b. facial wall of grooves
c. facial aspect of prep
a. lingual wall of grooves
Most important dimension that ensures the metal connector between abutment and
pontic is sufficient (in 3-unit fpd bridge)?
-buccolingual
-occlusogingival
-Mesiodistal
occlusogingival
How do you decrease the width of an artificial tooth? Deepen the facial line angle proximally and increase the interproximal embrasure, Deepen the facial line angle proximally and decrease interproximal embrasure, take the facial line angle labially and increase the interproximal embrasure, take the facial line angle labially and decrease the interproximal
embrasure.
take the facial line angle labially and increase the interproximal embrasure
The strength of soldered connector of FPD in enhanced? 1. Using higher carat solder, 2.
Increasing height , 3. Increasing width, 4. Increasing gap
increase height
key vs keyway: which one is on pontic and which one is on abudment?
Key is within pontic
keyway is within retainer
What is an active screw (post) vs. inactive post?
An active post is one that engages (screws into) the dentin in the canal space. Traditionally, the major
concern about active posts has been the potential for vertical fracture of the tooth during placement of the
post. active posts are indicated when the canal length is insufficient to gain adequate retention with a
passive post
Most important when selecting shade? value, transluceny, chroma,
concentration, and hue, color .
value
When you have color index of 100, which of the following is effected?
hue/value/chroma
value
When you add a different color to a resin, you increase what? Hue? Value? Chroma?
chroma
A dentist adjusts the shade of a restoration using a complementary color. This procedure will result in A. increased value. B. decreased value. C. intensified color. D. increased translucency
B. decreased value.
