Occlusion

Question 1

definitions

Answer 1

mandibular movement and the resulting contacts of maxillary and mandibular teeth from these movements

Question 2

intra-arch alignment

Answer 2

with in the same arch

Question 3

interarch alignment

Answer 3

with opposing arch

Question 4

Intra-arch alignment characteristics

Answer 4

1. contact areas and tooth form

2. embrasures

Question 5

axial positioning of intra-arch alignment

Answer 5

relationships created parallel to and with the long axis of the teeth

Question 6

Curve of spee description and function

Answer 6

Anterior-posterior
description-canine tip to DB cusp of maxillary second molar
function-distribute occlusal forces

Question 7

curve of wilson descript. and function

Answer 7

medial to lateral (lingual inclination)
descript.-inclination of teeth
function-distribute occlusal forces

Question 8

intra-arch alignment variations

Answer 8

buccoversion-buccal to normal arch form
linguoversion-lingual to normal arch form
tosoversion-tooth rotate/turns in an otherwise normal position

Question 9

Supraversion

Answer 9

supereruption due to lack of opposing tooth

Question 10

infraversion

Answer 10

ankylosed-tooth does not reach occlusal plane. Generally primary teeth that are retained

Question 11

mesioconversion

Answer 11

loss of one tooth causing posterior tooth to drift to midline

Question 12

distoversion

Answer 12

tooth moves away from midline, usually pre-molars

Question 13

Centric relation

Answer 13

bone dictated position, condyle and temporal bone (interarch)

Question 14

Centric Occlusion

Answer 14

tooth dictated, position where teeth fit together best (interarch)

Question 15

Elevation 2 movements

Answer 15

1. CR

2. CO

Question 16

Lateral movements

Answer 16

1. canine guidance/group function; posterior teeth open up when canines touch
2. working side; when moving mandible to the right side, that side is the working side,
3. balancing side; when the mandible is moved to the right side, the left side becomes the the balancing side

Question 17

protrusion movements

Answer 17

1. anterior movement
2. determined by temperal bone and anterior teeth shape
3. posterior teeth should not touch

Question 18

retraction movements

Answer 18

1. opposite of protrusion

2. only anterior teeth contact

Question 19

4 characteristics to ideal occlusion

Answer 19

1. CR=CO
2. canine protection in lateral movements
3. no balancing side interference
4. no posterior interference in protrusion

Question 20

2 traits of premature contacts

Answer 20

1. contact before CO or guided CR

2. instability in patients occlusion

Question 21

Articulation of a complex hinge joint is what class lever system?

Answer 21

class 3

Question 22

ligaments only restrict..

Answer 22

envelope of motion. no ability to move mandible

Question 23

3 traits of muscles

Answer 23

1. create all mandibular movement
2. CR; posterior position in the envelope of function where mandible should be during function
3. CO; teeth create a muscle memory, and muscles take teeth where they fit best

Question 24

overjet characteristics

Answer 24

1. horizontal overlap
2. avoid biting soft tissues
3. protects anterior incisal edge
4. allows for posterior maximal intercuspation

Question 25

underjet

Answer 25

maxillary anterior teeth are lingual to mandibular anteriors

Question 26

overbite characteristics

Answer 26

1. usually with in the incisal 1/3 2. creates disclusion of posterior in protrusion 3. excessive lingual attrition 4. deficient open bite