3 veneers

Question 1

What are the most estheticaly pleasing of all fixed restorations:

Answer 1

Crowns, inlays, veneers made of all dental porcelain

Question 2

veneersits an alternative for :
*when possible

fills the anteriors 3-3 or 5-5

Answer 2

full crowns

Question 3

anesthesiafor veneers?

Answer 3

local anesthesia is not required but for crowns its a must

Question 4

advantages of veneers

Answer 4

labial reduction .5 mm

Question 5

disadvantages

Answer 5

1 difficult in not excessivly contoured restorations
2expensive
3effect in gengival health’‘subgingival”

Question 6

indications for veneers:

Answer 6

1 discolored teeth
2 stained teeth
3 mildly MALalighned

Question 7

cauces of discoloration :

Answer 7

antibiotics -tetracyline
hypo-minerlization =enamel defet in child 0-2
hypo-calcification

Question 8

a case of making veneers?

Answer 8

-crowded tooth
-diagnosting waxing to obtain incisor form
-vacum formed matrix(invisilign)
**-tooth preperation
**-placed restoration

Question 9

contraindecations veneer

Answer 9

-severe midline
-class 3occlusion edge to edge
-periodontal disease
-insufficient enamel- cuz its where the cementation occurs

Question 10

special considerations:

Answer 10

1 midline
2 incisal length
3 zenith points

Question 11

zenith point

Answer 11

dictated byroot form anatomy/cementoemnamel junction/osseous crest,bone
DISTAL tithe centrals

Question 12

how to close diastema?
what happento the zenith point

Answer 12

distal portions of the centrals and lateral is cut down and add porcelain to the mesial

this leads to mesiallyshifted of zenith piont

Question 13

why PLV is placed supragingivally?

Answer 13

because the bonding materialwont be in direct contact with the gingiva

Question 14

used instrumants:

Answer 14

1mm rounf bur=for making chamfer
.5mm depth cutter/rotary instrumant
finishing strip=create proximal clearance

Question 16

why usingthe rotary instrumant/depth cutter?

Answer 16

make initial depth grooves while avoiding undesired penetration of abnormally thin enamel

Question 17

what are the areas that often overcontoured?

Answer 17

gingival third and proximal lines angles

Question 18

after the diagnosting waxing we take indix putty reduction guid from the diagnostic waxing?

Answer 18

for determing optemum reduction

Question 19

its preferable not to reduce the incisal edge but it cant be avoided?

Answer 19

cuz it help support the porcelin and makes chipping less likely

Question 20

preperation types of dental veneers:

Answer 20

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

Question 21

which type of prep provide path of incertion that is free from the undercuts ?

Answer 21

type one

Question 22

which type have a greater thickness and control shades?

Answer 22

type 2

Question 23

chamfer line is

Answer 23

cavosurface margin should follow the gingval crest and if there is no shamfer you cant make the veneers

Question 24

techniques in fabricating PLV

Answer 24

1 platinum foil
2 refractory
3 pressed
4 cad/cam

Question 25

refractoy die technique depend on what?

Answer 25

on the dntal technisian skilles

Question 26

what material we should use in the refractoy die technique?

Answer 26

refractory die material- phosphate bonded material

Question 27

important steps in refractory die technique :

Answer 27

-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

Question 28

what does the platinum foil do?

Answer 28

support the porceline during firing and prevent distortion
and great adaptation

Question 29

veneer can be mde as thin as .3 but why its not prefarable ?

Answer 29

for transtucensy purposes cuz if any defects was in the prepared tooth it will cover it if its .5

Question 30

ADV and DISADV for platinum foil:

Answer 30

adv: low cost
quick easthatic acceptable
disadv:technique sensitave high skill is required

Question 31

what is the most apical point of the clinical crowns (height of contour)?

Answer 31

zenith point

Question 32

for gingiva, third over contoured maximum reduction should be achieved with

Answer 32

minimum penetration intondentin

Question 33

how doe the refractory model degassed?

Answer 33

placed in regular burnout 600 for 20 min