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RD Second half Semester > Occlusion II > Flashcards

Occlusion II Flashcards

1
Q

How does musculature effect tooth position?

A

-labial to teeth are the lips and cheeks that provide relatively ight but constant lingually directed force
-tongue

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2
Q

what is neutral space?

A

position where labiolingual and buccolingual forces are in equilibrium

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3
Q

How does proximal contact impact tooth position?

A

prox contact between teeth helps maintain alignment due to continuous mastication over time tooth wear in proximal areas put at risk of mesial drift

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4
Q

how do occlusal contacts impact tooth position?

A

precent extrusion or super-eruption of teeth

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5
Q

the buccoccusal line is on which arch?

A

mandibular (reveals arch form)

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6
Q

the linguocccusal line is on which arch?

A

maxillary (reveals arch form)

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7
Q

how is proximal contact location related to central fossa line?

A

they are sightly buccal to it

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8
Q

The maxillary lingual occlusal line aligns with what on the mandibular teeth?

A

Mand central fossa

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9
Q

The mandibular buccal occlusal line aligns with what on max teeth?

A

Central fossa line

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10
Q

What are supporting cusps?

A

Cusps of teeth that contact and support maximal intercuspal position (usually facial cusps of mandibular posterior teeth and maxillary palatal cusps)

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11
Q

What do non supporting cusps do

A

Overlap opposing teeth, usually max buccal and mand lingual cusps

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12
Q

What might happen without the overlap of max buccal and mand lingual cusps?

A

Biting cheek or tongue

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13
Q

Are teeth positioned up and down in the mouth?

A

No! Mand posterior teeth crowns have lingual tip and laterally roots

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14
Q

How do max posterior teeth keep the crown?

A

Slight buccal inclination with lingual inclination in root

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15
Q

From a lingual view all teeth have a slight _____ inclination

A

Mesial

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16
Q

Anterior crowns have a slight ____ protrusion and their crowns seem to ?

A

Labial, laterally
In other words the anterior teeth tip out to the side and to the front

17
Q

What is the difference between overjet and overbite?

A

Overjet is horizontal overlap
Overbite is vertical overlap

18
Q

What is the advantages of cusp- fossa relation?

A

Directs forces along axis of tooth
Greater stability for entire arch of teeth and less tendency for tooth movement
Less chance for food impact ion between embrassure

19
Q

How many teeth normally tout with occlusion and what are the exceptions

A

2
Except for mand central and max third molar that only touch one tooth

20
Q

What is crossbite?

A

When one or more teeth in Mand arch are located facial to max counterparts

21
Q

When you bite down what should happen to posterior teeth?

A

They should all come into contact at the same time, if they don’t then the one hitting first takes the most force and is subject to damage

22
Q

What is posselts envelope of motion?

A

-Refers to extreme range of motion allowed by the mandible
First 20mm of mandibular movement is rotation, then translation of condyle begins

23
Q

In real life do people function at the envelope of motion?

A

No but function within it

24
Q

What is mandibular transition?

A

The translators (mediolaterial) movement of mandible when viewed from frontal plane
(Movement to the left, condyle on left remains stationary while right condyle and disc move forward and down and mesial within articulator fossa)

25
Q

What is a protrusive jaw movement?

A

Position when mandible moves anteriorly so both mand condyles and discs are forward in fossa

26
Q

What is anterior guidance?

A

When the mandible moves into protrusive, the mandibular anterior teeth glide along the lingual surfaces of the max anterior teeth and disclude posterior teeth

27
Q

Mandibular protrusion happens as what passes what?

A

Mand teeth pass their max counterpart in anterior direction

28
Q

Centric occlusion position is

A

1mm away from maximal intercuspation position (most retruded mandible can be)

29
Q

What is the working side?

A

The side toward which the mandible moves in lateral excursion

30
Q

What is the non working side?

A

Side of mand that moves toward medial line in lateral excursion also called balancing side

31
Q

What determines the exact pathway of the balancing side during mediotrusion?

A

shape of the medial wall and the superior aspect of the articular fossae, the medial pole of the balancing condyle, the congruency of the articulating disc with the articulating surfaces, the tightness of the capsule, and the ligaments

32
Q

Right working movement is result of:

A

rotation of the right (working) condyle around a vertical axis and translation of the left (non-working) condyle down, forward and inward.

33
Q

The amount of the translatory displacement (side shift) of both condyles varies individually and depends on the anatomical constraints, such as

A

ligaments and capsule of the working side
TMJ, shape and congruency of the balancing side condyle with the medial and superior walls of the articulating fossa, and the differential activity of the masticatory muscles.

34
Q

Multiple contact relations between the maxillary and mandibular teeth in lateral movements on the working-side whereby simultaneous contact of several teeth acts as a:

A

group to distribute occlusal forces

35
Q

What is canine guidance?

A

A form of mutually protected articulation in which the vertical and horizontal overlap of the canine teeth disclude the posterior teeth in the excursive movements of the mandible

36
Q

What is mutually protected occlusion?

A

an occlusal scheme in which the posterior teeth prevent excessive contact of the anterior teeth in maximal intercuspal position, and the anterior teeth disengage the posterior teeth in all mandibular excursive movements
( ant protects post and vice versa)

37
Q

What is bilateral balanced occlusion?

A

Occurs when all posterior teeth contact on the working side
and one or more teeth on the balancing side contact
simultaneously

38
Q

When is the only time bilateral balanced occlusion is used?

A

Complete dentures
(Potentially dangerous for a patient with maturation teeth to have contact in nonworking side)

39
Q

Increasing the anterior guidance has what effect on occlusal determinants?

A

Allows lengthening of a cusp that otherwise had to be shoerter in the presence of a pronounced immediate lateral translation of the condyles

RD Second half Semester (5 decks)

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