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Occlusion > Ashman review > Flashcards

Ashman review Flashcards

1
Q

what happens at the condyles in the early stages of opening the mouth

A

pure rotation at the condyles

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2
Q

what happens at the condyles in the late stages of opening the mouth

A

translation

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3
Q

what do you look for to determine if you have a class 1 occlusion (angles class of occlusion)

A

in class 1 occlusion the MB cusp of the maxillary 1st molar should rest in the MB groove of the mandibular 1st molar

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4
Q

What is the position of the condyles when you are in CR (centric realtion)

A

they are UNRESTRAINED in the superior posterior part of the glenoid fossa

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5
Q

is CR a cuspal relationship

A

no, it is a skeletal position and is totally independent of tooth contacts

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6
Q

what is CO (centric occlusion)

A

maximum intercuspation

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7
Q

concerning posselts envelope of motion, when do you have the smallest vertical dimension

A

when you are in CO

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8
Q

concerning posselts envelope of motion, what happens to your vertical dimension when you move from CO in a protrusive motion

A

your vertical dimension increases

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9
Q

concerning posselts envelope of motion, what happens to your vertical dimension when you move from CO in a retrusive motion

A

your vertical dimension increases

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10
Q

what is the curve of spee

A

the anterior to posterior curve of the teeth seen from the sagittal plane

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11
Q

what is the curve of wilson

A

the right to left curve of the teeth seen from the frontal plane

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12
Q

what is a combination of the curve of spee and curve of wlison

A

the sphere of monson (said you could put an 8” diameter ball on the mandible and it would touch each cusp tip)

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13
Q

what is christensens phenomenon

A

the fact that when you do a protrusive movement, your incisors remain in contact but your posterior teeth separate from each other.

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14
Q

what causes christensens phenomenon

A

the angle of the articular eminence of the temporal bone. when the condyle translates out of the glenoid fossa it goes down along the articular eminence. this depression causes the gap between posterior teeth

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15
Q

the larger the gap between the posterior teeth in a protrusive movement, the _____ the angle of the articular eminence

A

steeper

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16
Q

what are other names for the bennett movement

A

lateral side shift

lateral mandibular translation

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17
Q

in a bennett movement what happens with the condyle on the working side

A

the working side condyle rotates (eventually it will also translate)

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18
Q

in a bennett movement what happens with the condyle on the non-working side

A

it translates

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19
Q

there will be a picture of the articulators analog of the medial wall of the glenoid fossa, what is the angle of that wall associated with

A

the bennett angle

20
Q

what on the articulator is the analog of the condyle

A

the brass ball

21
Q

what is the brass ball of the articulator the analog of

A

the condyle

22
Q

before putting the alginate impression and tray into the mouth of a patient, what must you check for in their mouth

A

tori

23
Q

should you make sure that a patient doesn’t have stuff in their teeth before taking an alginate impression

A

yes

24
Q

what do you do with your impressions if you have a patient with heavy calculus

A

take an impression with the calculus, and take one after the calculus has been removed to show the patient the difference

25
Q

What is the formula for gypsum you need to know

A

CaSO4*1/2H2O + 1.5H2O –> CaSO4 * 2H2O + heat

I think its the only option with CaSO4

26
Q

what are some various uses of gypsum products

A
  1. used as the investment in lost wax products
  2. plaster for impressions for a complete denture
  3. make casts
    (not flexable)
27
Q

what do you need to remember about taking alginate impressions out of a patients mouth

A

You need to SNAP it out quickly, if you don’t it can mess with the modulus of elasticity (make it less accurate)

28
Q

what should you have the patient do when you are removing an alginate impression from their mouth

A

relax with their mouth half open

29
Q

what can you do to increase the setting time of your alginate

A

use cold water

30
Q

what are the 4 primary muscles of mastication

A

masseter
temporalis
lateral pterygoid
medial pterygoid

31
Q

which muscle is the only depressor of the mandible

A

the lateral pterygoid

32
Q

which muscles elevate the mandible

A

masseter
temporalis
medial pterygoid

33
Q

where do you put the excess alginate you have mixed

A

in the trash, not the sink

34
Q

is alginate reversable or irreversable hydrocolloid

A

irreversable hydrocolloid

35
Q

what type of reaction is the alginate reaction

A

chemical

36
Q

(picture or the T-bar) what is the T-bar used for

A

to hold up the bite fork when you are setting up your maxillary cast for mounting

37
Q

what type of joint is the TMJ

A

a giglymoarthroidal joint

38
Q

what is a ginglymoarthroidal joint

A

a joint that both glides/slides, and rotates

39
Q

are crowns made on small articulators, or on articulators that are closer to the size of the patients skull more accurate

A

those that are larger are more accurate (you will have to make less adjustments on crowns made on larger articulators than those made on small articulators)

40
Q

what happens with the disk of the TMJ in a healthy TMJ when the mouth opens widely

A

it pulls foreward with the condyle, and stays between it and the articular eminence

41
Q

what is the #1 goal is restorative dentistry

A

not to introduce any interferences into the patients mouth

42
Q

what are the possible outcomes if there are interferences put into a patients mouth

A

small interferences - the patient may adapt

larger ones - the patient will not adapt and this will cause problems if not corrected

43
Q

why do we use the articulator when doing restorative dentistry

A

so that we have fewer and smaller interferences

44
Q

what bite record do you need to set the condylar guidance angle

A

the protrusive bite record

45
Q

what happens to your alginate if you have a high guluronate to mannuronate ratio

A

it will be strong and brittle

46
Q

what happens to your alginate if you have a high mannuronate to guluronate ratio

A

it will be weak and elastic

Occlusion (7 decks)

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