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fixed 2 > reading > Flashcards

reading Flashcards

1
Q

what should all contact after occlusal adjustment

A

3 anterior and 3 posterior

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2
Q

what part of the tooth should be adjusted in occlusal adjustment

A

deepen the opposing fossa

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3
Q

what are aliginates made of

A

hydrocolloids of sodium or potassium salts of alginic acid in water that reacts with calcium sulfate to produce a calcium alignate

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4
Q

how heavy should you adjust

A

adjust the indicating mark, don’t remove the entire mark

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5
Q

how is CR taken

A

in the terminal hinge position where opening and closing are purely rotational movements

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6
Q

what is defined as a CR

A

defined as the maxillomandibular relationship where the condyles articulate with the thinnest avascular portion of their respective disk

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7
Q

why do CR mounting

A

has more diagnostic value compared to those mounted in MI

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8
Q

what are excursive movement

A

laterotrusive

protrusive

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9
Q

how is the upper member of an articulator moved for A right laterotrusive movement

A

upper moved to the left

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10
Q

does CR depend on tooth intercuspation

A

independent of tooth contact

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11
Q

what do you do to put into CR if mandible is difficult to manipulate

A

deprogramming device is useful

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12
Q

Bio considerations for the tooth prep

A 
conservation of tooth
avoidance of over contour
supragingival margin
Harmonious occlusion
Protection against tooth fracture
minimize damage to surrounding dental tissue
look at future dental health prep
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13
Q

mech considerations for the tooth prep

A

affect the integrity and durability of the restoration
Retention
Resistance
Deformation

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14
Q

esthetic considerations of the prep

A

mini display of metal
maxi thickness of porcelain
porcelain occlusal
subgingival margins

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15
Q

what are so considerations affecting future dental health

A

Axial reduction for development of good axial contours
margin located supragingival
margin adaptation (junction between restoration and tooth)
Margin geometry

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16
Q

problem with subgingival margins

A

hard to clean

major factor in periodontal disease

17
Q

what outranks lack of retention as a cause of failure of crowns

A

dental caries

porcelain failure

18
Q

factors concerning retention form

A

magnitude of dislodging forces
taper (slight, but not parallel cuz won’t be able to seat)
surface area (long walls more retentive)
stress conecetrations ( rounded line angle reduce stress concentration)
types of prep
roughness of surface to be cementeed
material to be cemented ( base metals better retained than less reactive high-gold metals)
types of luting agent

19
Q

how do lateral movements affect a restoration

A

displace the restoration by rotating around the gingival margin

20
Q

good resistance depends on

A

magnitude and direction of dislodging force
geometry of prep( follows the same rule as retention)
partial coverage has less resistance ( U shaped grooves and boxes help)
luting agents
decresing the temp

21
Q

what preformed provisional looks the most natural

A

Polycarbonate( can even be relined to look nicer)

22
Q

how are polycarbonate crowns supplied

A

Incisor
Canine
Premolar

23
Q

why are methyl methacrylates highly exothermic

A

due to the low molecular weight leading to many reactions

24
Q

why use sand disks with methacrylates and thermoplastic materials

A

will melt if you use diamond burs

25
Q

what is the core of a dental crown

A

Dentin

26
Q

how does cement keep the crown on

A

increases friction

most don’t bind/adhere to the tooth

27
Q

ideal tapper

A

6 degrees

28
Q

how rotation of the prop is stopped

A

compressive areas called resistance areas

29
Q

how is prep height related to difficulty of displacement

A

linear

30
Q

Roll of silicate glasses

A

controls shrinkage
strengthens
esthetics

31
Q

How is zirconia keep stable in its tetrogoneal possition

A

substituting some Zr4+ with larger ones

32
Q

when some of the zirconia in dense sintered zirconia is replaced with larger ions

A

stabilized zirconia

33
Q

How is all zirconia made

A

must be milled,

can’t be pressed from wax

fixed 2 (8 decks)

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