Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

SP17: Occlusion > Midterm > Flashcards

Midterm Flashcards

1
Q

Two schools of articulator design?

A
  1. Geometric School: disregarded condylar paths

2. Condylar School: has adjustable condylar guides and average value instruments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Describe the equilateral triangle theory.

A

The size of the mandible is equal to 10 cm from condyle to condyle and from each condyle to the incisor point. (Bonwill)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is the Balkwill angle?

A

Formed between the occlusal plane and Bonwill triangle. 26 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the cylindrical theory of von Spee?

A

The teeth curve around an axis around the mid-orbital plane. The steeper the condyle path, the more pronounced the curvature.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Christensen’s phenomenon?

A

When you move the mandible forward, a space is created between the posterior teeth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Who presented the spherical theory?

A

Monson

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Which theory uses the external occipital protuberance as a rotation center of the mandible?

A

Hall’s conical theory

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is a protrusive movement?

A

Forward and down

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What is rotational or rotatory movement?

A

When an object moves around an axis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What is translational or translatory movement?

A

When an object makes a bodily movement. The whole thing moves in space

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What is the THA?

A

Terminal Hinge Axis or Transverse Horizontal Axis. The rotational axis of the condyles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

What is the working side during mandibular movement?

A

Whichever side you choose to move the mandible to

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

How does the non-working condyle move in lateral movement?

A

Down, forward, and medial

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

How does the working condyle move during lateral mandibular movement?

A

Bennett’s Movement: draw a cone lateral from the condyle

The condyle can move anywhere in the cone of Bennett

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Describe the motion of the mandible in terms of rotational and translational movement?

A

The condyles will rotate around the THA for the first few millimeters of opening. The condyles will then under go protrusive translational movement to open the rest of the way.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

T/F: Chewing movement involves a circular mandibular motion.

A

TRUE

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is the difference between centric occlusion and maximum intercuspation?

A

Centric Occlusion: when the first touch of teeth occurs when closing the mouth

Maximum intercuspation: when the mouth is closed as much as possible

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is Posselt’s envelope of motion?

A

An imaginary border that bounds the mandibular movements

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What are some functions of the anterior teeth?

A
  1. Anterior guidance
  2. Perform initial mastication
  3. Speech
  4. Lip Support
  5. Esthetics
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is group function?

A

When all of the posterior teeth occlude with the same equally distributed force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What type of anterior guidance results from Class II occlusion?

A

Deep bite (bottom teeth extremely lingual)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What type of anterior guidance results from Class III occlusion?

A

Open bit (bottom teeth rest on the facial of top)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Why is it important to restore or replace teeth when possible?

A

When tooth contacts are missing the mandible is unstable and the forces are not dispersed properly to each tooth

24
Q

It is important to have _____ and ______ contact of all teeth during closure.

A

EVEN and SIMULTANEOUS

25
Q

What does it mean for someone to have MI=CO?

A

There is no slide from first contact to maximum occlusion

26
Q

What part of the tooth structure is meant to tolerate pressure forces?

A

periodontal ligament

27
Q

What are the two spots that cusps will often occlude with the opposing teeth?

A

Fossa or the marginal ridge

28
Q

How many points of contact is optimal for a tooth cusp on the occluding surface?

A

three (tripodization)

29
Q

What are the aspects of mutually protected occlusion?

A
  1. Contact of posterior teeth minimize horizontal load on anterior teeth
  2. Anterior teeth protect posterior teeth from lateral or protrusive movements
30
Q

What are some possible negative effects from tooth loss?

A
  1. Supraeruption
  2. Tilting
  3. Loss of contact
  4. Loss of posterior tooth support
  5. Loss of vertical dimension
  6. Flaring of anterior teeth
  7. Non-working interferences
31
Q

What are the four major occlusal treatment goals?

A
  1. Forces along long axis of teeth
  2. CO=MI
  3. No non-working interference during anterior guidance
  4. Working contacts should not be prevented by non-working
32
Q

How far does the mandible maintain rotation without translating?

A

20-25 mm

33
Q

Who developed the “envelope of motion” for the mandible?

A

Ulf Posselt

34
Q

How do you calculate the interocclusal rest distance?

A

Vertical dimension of rest minus vertical dimension of occlusion (VDR - VDO)

35
Q

T/F: It is bets to fix small issues with occlusion even at the risk of creating new occlusion interferences.

A

FALSE

if the patient is not in discomfort it is often best to not risk creating new interferences

36
Q

What is the basic rule to correct an anterior slide?

A

MUDL: grind Mesial of Upper or Distal of Lower

37
Q

Do we grind cusps or inclines?

A

Inclines

38
Q

What is an interference to line closure?

A

Cause mandible to deviate right or left from CO to MI

39
Q

If the interfering incline causes the mandible to slide to the cheek what is the grinding rule?

A

BULL: grind Buccal of Upper or Lingual of Lower

40
Q

If the interfering incline causes the mandible to slide toward the tongue what is the grinding rule?

A

LUBL: grind Lingual of Upper or Buccal of Lower

41
Q

What is the grinding rule for lateral interferences on opening on non-working cusps?

A

BULL

42
Q

What is the rule for eliminating protrusive interferences?

A

DUML

43
Q

What Angle’s classification is ideal?

A

Class I: mesiobuccal cusp of maxillary first molar is centered on the buccal groove of the mandibular first molar

44
Q

Describe class II occlusion?

A

mandibular arch is posterior to the maxillary arch

45
Q

Describe class III occlusion?

A

the mandibular arch is anterior to the maxillary arch

46
Q

What are the centric cusps?

A

Lingual or maxillary posterior teeth and buccal of mandibular posterior teeth

47
Q

Which curve is the anteroposterior curve? (viewed easily from the Side)

A

curve of Spee

48
Q

Which curve is the mediolateral curve?

A

curve of Wilson

49
Q

What is an excursive movement?

A

When the mandible moves away from MI

50
Q

What is horizontal overlap?

A

The projection of teeth beyond their antagonists

51
Q

What is overjet?

A

When the maxillary insisors are labial to the mandibular incisors?

52
Q

When does the greatest portion of translation occur during lateral movement?

A

Early in the first 4 mm

53
Q

What is reverse articulation?

A

mandibular teeth are facial to ideal occlusion

54
Q

What is vertical overlap? (overbite)

A

Amount that maxillary anteriors are inferior to incisal edges of mandibular anteriors

55
Q

What is the frankfort horizontal plane?

A

A line from the lower eye to the upper ear

SP17: Occlusion (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions