Occlusion Lecture 1 Flashcards Preview

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Flashcards in Occlusion Lecture 1 Deck (43):
1

maximal intercuspal position

Complete intercuspation of opposing teeth, independant of condylar position

"best fit of teeth"
when the dentist says "close all the way"

2

7 components of the masticatory system

- dentition
- supporting structures (bone, gums, ligaments)
- the 2 arches
- TMJ
- muscles
- innervation
- vasculature

3

centric relation

Maxillomandibular relationship with the condyles articulating at the thinnest portion of their disks in the anterior superior position.

- Is independent of tooth contact.
- Rotation strictly about the transverse horizontal axis.

4

centric occlusion

Occlusion of teeth when the mandible is in centric relation. Can be be same as maximal intercuspal position.

5

retruded contact position

Guided occlusal relationship occurring at the most retruded condylar position.

retruded - as most posterior as possible

6

distance between xray and mid-saggital plane?

60 inches

7

distance between mid-saggital plane and film?

About 15 inches

8

True or False:
Distance between mid-saggital plane and xray film must be the same between takes otherwise the image is distorted.

True. Image can't be compared to previously taken xrays.

9

PO || porion

midpoint of upper contour of external auditory meatus

10

S || sella

midpoint of sella turcica cavity

11

O || orbitale

lowest point of the inferior margin of the orbit

12

POG || pogonion

most anterior part of chin

13

ME || menton

most inferior point on the mandibular symphysis

14

GN || gnathion

center of the inferior contour of the chin

15

GO || gonion

center of the inferior contour of the mandibular angle

16

N || nasion

anterior point of the intersection of the frontal bone and nasal bone

17

Frankfort Horizontal Plane

PO --> O
porion to orbitale

18

occlusal plane

line bisecting the overlapping cusps of 1st molars and incisors.

19

cant of the occlusal plane

angle between Frankfort and occlusal plane
9.3 degree angle for perfect class 1 occlusion

20

How many degrees is the cant of the occlusal plane?

9.3 degrees

21

facial plane

POG --> N
pogonion to nasion

22

facial angle

angle between Frankfort and facial plane. It is the degree of or retrusion of the manible

mean angle = 87.7 degrees

23

How many degrees is the facial angle?

87.7 degrees

24

axis orbitale plane

O --> terminal hinge axis
orbitale to terminal hinge axis

terminal hinge axis = where the mandible rotates

25

mandibular plane

GO --> ME
gonion to menton

26

Frankfort mandibular angle

angle between the frankfort and mandibular planes
mean angle = 21.9 degrees

27

How many degrees is the frankfort mandibular angle?

21.9 degrees

28

Y growth axis

the angle measured between the line formed by S - GN (sella and gnathion) and the frankfort horizontal plane.

- indicates position of chin
- bisects the angle formed by the mandibular and facial planes

29

inter incisor angle

internal angle the maxillary and mandibular incisors make

- 135 degrees
- occlusal plane bisects this angle dividing it unequally.
maxillary = 60 degrees and mandibular = 75 degrees

30

postural position

mandibular relationship with minimal muscle contraction

31

occlusal vertical dimmension

distance between 2 points when in occlusion

32

rest vertical occlusion

distance between 2 points when mandible is in physiologic resting position

Point A: middle of face or nose
Point B: lower face or chin

33

physiologic rest position

head upright puts the mandible in a position and elevator and depressor muscles are in equilibrium (tonic contraction).

- condyles are neutral

34

interocclusal distance

distance between occluding maxillary and mandibular surfaces with the mandible in a set position

35

interocclusal rest space

difference between rest vertical dimension and occlusal vertical dimension while in occlusion

36

curve of wilson

follows curve of mandibular molars from one side to the other of the arch

37

curve of spee

line that follows the occlusal table

38

occlusion class I

normal occlusion

39

occlusion class II

maxilla sticks out further than class I occlsion

- division 1: central incisors stick out
- division 2: central incisors stick inward

40

occlusion class II division 1

maxilla sticks out further with the central incisors sticking out

41

occlusion class II division 2

maxilla sticks out further with the central incisors sticking in

42

occlusion class III

mandible sticks further out than maxilla.

43

neutral position

teeth are in a position where lingual and labial forces are equal. Neutral position can change if forces change