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what is the hygienist implication of porcelain?
watch porcelain margins
what is the MOST COMMON restoration in fixed prosthodontics?
Procelain-Metal Restorations (PBM/PFM)
how does metal and porcelain bond?
through OXIDE layer on metal as metal is heated
an advantage of PFM is the strength of the restoration from the ______ between the ____ and the ______
what are most porcelain failures related to?
chemcial bond between porcelain and metal OXIDES upon OCCLUSAL LOADING
what is the metal thickness of a PFM?
porcelain jacket crowns are made from _____ ____ ____
low fusing porcelain
the ____ _____ in the ______ area is ______ due to the _______ _____ with all ceramic crowns than the PFM
- fracture rate
- occlusal loading
what type of restorations are all ceramic crowns used for?
what are two advantages of low fusing porcelain over regular procelain?
- less wear (less abrasive) on opposing teeth
- easier to polish
what is an advantage of all ceramic compared to PFM?
no opaque laer to mask metal
what are two advantages to the computer assisted CAD/CAM restoartions?
- no die needed and not temp corwn
- Optical canner makes impression of crown prep/adj teeth
with the computer assisted CAD/CAM restorations what takes an "impression" of the crown prep and adjacent teeth?
t/f vaneers are less opaque
false, MORE OPAQUE
vaneers can be used to cover defects such as what?
does a veneer bond better to enamel or dentin?
ENAMEL! bond is stronger than dentinal bond
what is the strongest bond overall?
______ coupling agent is added to _____ porcelain surface to enhance bond between the procelain and resin cement
what is used for conditioning with a vaneer?
what do you look for when taking a shade? 3
what is the tooth color or mixtures of color?
what is the INTENSITY of color?
what is the lightness or darknees of tooth (GRAYNESS)
when is the shade taken? 2
- preparation of tooth
- rubber dam placement
with what type of lights would a shade look more blue?
t/f with incandescent lights the shade appears more yellow
the natural _____ light is great but not in the AM or PM..why?
- more yellow and orange in AM and PM there is less green and blue
dental unit lights _______ shade brightenss and ______ color intensity
the dental unit light increases the shade ______ and decreases _____ _____
- color intensity
what type of backgroud do you want when taking a shade?
what color of bib is good for taking a shade?
what type of shade guide is used when taking a shade?
PORCELAIN shade guide
when taking a shade the shade tabs should be _____ and next to the tooth in the same ______
what is noted when characterizing a shade? 3
what type of fluoride is used with porcelain restorations?
neutral sodium fluoride
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