class IV stuff Flashcards
what needs to match in tooth restorations
Shape
Surface texture
Color
Translucency
distal outline of central incisors shape
Slightly convex
more rounded on the mesial
distoincisal angle shape vs mesial of central incisors
distoincisal is more rounded
location of the crest of curvature of central incisors
in the incisal 1/3 close to the junction of the incisal and middle 1/3
what is the mesial outline of a central incisor
slightly convex to striatght
where is the crest of curvature of central incisors
in the incisal 3rd near the mesioincial angle
shape of the mesioincisal angle in central incisors
Sharp
are central incisors flat
No, 3 lobes with 2 concavities
should class 4 preps be preped ideally
No, should copy the opositng teeth
process of getting the shape of a tooth for class 4
follow outline
primary anatomy: line angles
secondary anatomy: surface changes in the tooth
tertiary anatomy: not smooth, but have perinkema
how do we determine the color of the teeth
Vita classic shade guide
3 dimensiosn of color
Hue
Chroma
Value
chroma
saturation/purity of color
Hue
color tone
Value
high value is light
low value is dark
hue for dentist
Color category of the dentinal body
Chroma for the dentist
Color saturation of the dentinal body
VAlue for the dentist
The degree of whiteness of enamel
A in shade guide
Red-brown
B in shade guide
Red-yellow
C in shade guide
greyish
D in shade guide
Red-grey
when shoudl shade matching be done
Before the teeth are exposed to dehydration
what happens to teeth when dehydrated
become lighter and does not return for 30 minutes of rehydration
in the vita system what happens are you increase in number
VAlue becomes more dark and chroma becomes greater
what does enamel do for the look of a tooth
Shape
Surface texture
Modifies dentin color
what does the dentin do for the tooth
Gives it color
Opacity
lobues
fluorescence
what happens to the optical properites of resin
are affected with time and water uptake, especially if not completely cured
Final resin shade depends on
Color of underyling tooth
thickness
Polymerization (yellow-blue, opaque)
finish and polish
what does opacitiy do
how much of the tooth blocks the black inside the mouth
what happens if you over whiten the tooth
eeth become black/grey because the dentin looses color
roll of fluoresnce of a composite
absorbs light slighty, and in dark can transmit a glow (big deal in clubs and makes tooth look life like
can patients tell small color differences in teeth
not nearly as well as dental professionals
what thickens as you go incisal on a class IV prep
enamel becomes thick
what happens to thickness as you go gingival on a class IV prep
more dnetin seen and less enamel
why do teeth look poly chromatic
different thickness of enamel and dentin
color change in not completed cured resin
yellow-> translucient due to photo-initiator going away
composite and moisture
abosrbs water, and tooth looks whiter without water
why might a tooth be dehydrated over time
rubber damn
do you always need to finish and polish composites
yes
what shouldnt be used when resotring class 3 and 4
wedges, BBL3 and 8A
how important is color mathcing
not needed for biological success, but needed for esthetic success
why do composites fail today
B/c of the densist (not the correct composite, bad technique
- last a long time anteriorly if correctly used
location of the CEJ for Central lateral Canine
High low high
oral-facial estheics
the maxillo-mandibular relationship to the face and the dental idline to the face pertaining to the teeth, mouth and gums
Oral estheics
the relation of the lips to the arches, gingiva and teeth
Dentogingival esthetics
the relationship of the gingiva to the teeth collectively and individually
Dental esthics
MAcro and micro dental esthetics
what is a negative space
the area that lacks something
Type 1 smile restoration
Only restorative (no changes in tooth positiong giniva and bike)
type 2 smile resotration
Crown lengthening (move ginvia)
type 3 smile restoration
Cr restorative (Change bite, increase VDO)
type 4 smile restoration
IMplant restorative (add bone implants)
type 5 smile restoration
Ortho (move tooth positions)
type 6 smile restoration
orthognatic restorative (move arch, faical profile)
how to do smile restoration
transfrom to type 1 first
pros of porcelain laminate veneers
Porcelain laminate veneers (excellent aesthetics, long durability)
cons of porcelain laminate veneers
Need to remove teeth
temporization often needed
cannot be repaired
expensive
pros of direct composite veneers
Conservative
inexpensive
excellenct esthics
No need to draw for prep
cons of direct composite veneers
operatior skill
less durable
