Occlusion Lecture 3

Question 1

Where do the lingual cusps of maxillary teeth and buccal cusps of mandibular teeth occlude?

Answer 1

Know this cold. Slide 2, lecture 3

Question 2

if shown an arch be able to differentiate it from maxillary or mandibular.

Answer 2

know this because she will not tell you on the exam/quiz

• use the number or shapes of molar cusps to differentiate

Question 3

horizontal-verticle overlap

Answer 3

the overlap of teeth that can be used to describe overbite if excessive.

• incisal guidance depends on this overlap
• can clinically see the amount of overlap
• Understand what dimensions increase/decrease and wether the teeth have increased/decreased incisal guidance based on changes to the parameters.

Question 4

anterior guidance

Answer 4

the influence of the contacting surfaces of anterior teeth on tooth limiting mandibular movements

• depends on horizontal and vertical overlap dimensions
• guidance can increase if the vertical overlap overlap increases
• guidance decreases with increased horizontal overlap

Question 5

If the vertical overlap increases what happens to the incisal guidance?

Answer 5

it increases.

• what happens if the vertical overlap decreases?

Question 6

If the horizontal overlap decreases what happens to incisal guidance?

Answer 6

It increases.

• what happens if horizontal overlap increases?

Question 7

working side

Answer 7

The side toward which the mandible moves in a lateral excursion.

• side of the mandible that moves to the cheek side

Question 8

nonworking side

Answer 8

The side of the mandible that moves toward the median line in a lateral excursion.

• side of the mandible that moves to the tongue or middle of the face

Question 9

if you move your mandible to the left what is the working and non working side?

Answer 9

mandibular left: working side
mandibular right: nonworking side

• what if the mandible moves to the right?

Question 10

group function

Answer 10

Multiple contact relation between the maxillary and mandibular teeth in the lateral movements on the working side.

• simultaneous contact points of multiple teeth act as a group to distribute occlusal forces

Question 11

canine guidance

canine protected articulation

Answer 11

Form of mutually protected articulation in which the vertical and horizontal overlap of the canines disengage the posterior teeth in excursive movements of the mandible.

• canines glide over each other to prevent occlusal forces from damaging molars, it helps in separating molars
• VERY LIKELY TO BE ON THE EXAM AND QUIZ

Question 12

transverse horizontal axis

hinge axis

Answer 12

An imaginary line around which the mandible may rotate within the sagittal plane

Question 13

hinge movement

rotation

Answer 13

The movement in space characterized by two divergent points moving around a central axis of rotation.

• mandible opening and closing around an axis basically and how the distance between two points (one on the maxilla and another on the mandible) changes with mandibular rotation

Question 14

translatory movement

Answer 14

The movement in space characterized by linear motion with no stationary axis of rotation

• movement of mandible without opening closing it (i.e. grinding mandible anteriorly or posteriorly)

Question 15

balanced articulation

Answer 15

The bilateral, simultaneous, anterior and posterior occlusal contact of teeth in centric and eccentric positions.

• ONLY applies to complete dentures only, NEVER natural occlusion.
• complete dentures dont rock back and forth in maximal intercuspation

Question 16

mutually protected articulation

Answer 16

An occlusal scheme in which the posterior teeth prevent excessive contact intercuspation, and the anterior teeth disengage the posterior teeth in all mandibular excursive movements

• applies to natural dentition

Question 17

What are the 3 functions related to teeth?

Answer 17

• mastication
• speech
• esthetics

Question 18

Occlusal Vertical Dimension (VDO)

Answer 18

distance between two points when in occlusion

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

Question 19

Rest Vertical Dimension (VDR)

Answer 19

distance between 2 points when mandible is in physiologic resting position

Question 20

physiologic rest position

Answer 20

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

• condyles are neutral

Question 21

Interocclusal Rest Space (IRS)

Answer 21

difference between VDO and VDR

VDR - VDO = IRS