3 veneers Flashcards
What are the most estheticaly pleasing of all fixed restorations:
Crowns, inlays, veneers made of all dental porcelain
veneersits an alternative for :
*when possible
fills the anteriors 3-3 or 5-5
full crowns
anesthesiafor veneers?
local anesthesia is not required but for crowns its a must
advantages of veneers
labial reduction .5 mm
disadvantages
1 difficult in not excessivly contoured restorations
2expensive
3effect in gengival health’‘subgingival”
indications for veneers:
1 discolored teeth
2 stained teeth
3 mildly MALalighned
cauces of discoloration :
antibiotics -tetracyline
hypo-minerlization =enamel defet in child 0-2
hypo-calcification
a case of making veneers?
-crowded tooth
-diagnosting waxing to obtain incisor form
-vacum formed matrix(invisilign)
**-tooth preperation
**-placed restoration
contraindecations veneer
-severe midline
-class 3occlusion edge to edge
-periodontal disease
-insufficient enamel- cuz its where the cementation occurs
special considerations:
1 midline
2 incisal length
3 zenith points
zenith point
dictated byroot form anatomy/cementoemnamel junction/osseous crest,bone
DISTAL tithe centrals
how to close diastema?
what happento the zenith point
distal portions of the centrals and lateral is cut down and add porcelain to the mesial
this leads to mesiallyshifted of zenith piont
why PLV is placed supragingivally?
because the bonding materialwont be in direct contact with the gingiva
used instrumants:
1mm rounf bur=for making chamfer
.5mm depth cutter/rotary instrumant
finishing strip=create proximal clearance
why usingthe rotary instrumant/depth cutter?
make initial depth grooves while avoiding undesired penetration of abnormally thin enamel
what are the areas that often overcontoured?
gingival third and proximal lines angles
after the diagnosting waxing we take indix putty reduction guid from the diagnostic waxing?
for determing optemum reduction
its preferable not to reduce the incisal edge but it cant be avoided?
cuz it help support the porcelin and makes chipping less likely
preperation types of dental veneers:
1 window
2 feather
those two has no reduction of incisal edge
3 bevel prep incisal 0.5-1.0
4 overlap prep 2.mm reduction extends to palatal aspect
which type of prep provide path of incertion that is free from the undercuts ?
type one
which type have a greater thickness and control shades?
type 2
chamfer line is
cavosurface margin should follow the gingval crest and if there is no shamfer you cant make the veneers
techniques in fabricating PLV
1 platinum foil
2 refractory
3 pressed
4 cad/cam
refractoy die technique depend on what?
on the dntal technisian skilles
what material we should use in the refractoy die technique?
refractory die material- phosphate bonded material
important steps in refractory die technique :
-mark margin with blue pencil
-burout for 20min 600-990
-refractory model soaked in distaled water 2-3min
-thin layer .2-,3 body of porceline
-slow cool the model
what does the platinum foil do?
support the porceline during firing and prevent distortion
and great adaptation
veneer can be mde as thin as .3 but why its not prefarable ?
for transtucensy purposes cuz if any defects was in the prepared tooth it will cover it if its .5
ADV and DISADV for platinum foil:
adv: low cost
quick easthatic acceptable
disadv:technique sensitave high skill is required
what is the most apical point of the clinical crowns (height of contour)?
zenith point
for gingiva, third over contoured maximum reduction should be achieved with
minimum penetration intondentin
how doe the refractory model degassed?
placed in regular burnout 600 for 20 min
