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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
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 _____ _____
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
chapter 8 dental ceramics