Occlusion

Question 1

•Multiple, even, bilateral, simultaneous occlusal contacts of the posterior
teeth in MIP with the mandible is CR position i.e. MIP and CR are coincident.
•The anterior teeth exhibit lighter occlusal contacts as compared to posterior
teeth in MIP
•Posterior teeth are axially loaded in MIP
•In excursive movements there is canine guidance and anterior guidance

Answer 1

Mutually protected occlusion

Question 2

Anterior teeth protect Posterior teeth and vice versa
•The posterior teeth withstand the majority of the load in MIP, protecting
the anterior teeth from high loads.
•The anterior teeth disclude the posterior teeth in excursive movements,
thereby protecting the posterior teeth from off-axis loading.

Answer 2

Mutually protected occlusion

Question 3

\: the canines on 
the working side guide the 
movement when the mandible 
moves laterally causing all other 
teeth to disclude

Answer 3

Canine guidance

Question 4

Mandible - _____ lever
• The more anterior (away from the fulcrum), the resistance (load) occurs, the
lesser the impact (magnitude)
• The canine(s) has the longest root, and best bone support (canine eminence)

Answer 4

Class III

Question 5

•THE ANGLE FORMED BY THE INTERSECTION OF THE HORIZONTAL
PLANE AND THE DISCLUSIVE PATHWAY OF THE ANTERIOR TEETH
•Influenced by
• vertical overlap (VO)
• horizontal overlap (HO)

Answer 5

ANTERIOR GUIDANCE ANGLE

Question 6

Horizontal overlap decreases, what happens?

Answer 6

Increase anterior guidance angle

Question 7

Vertical overlap increases, anterior guidance ______

Answer 7

Increases

Question 8

When the mandible moves laterally, the outer inclines of the mandibular
buccal cusps, on the working side, slide along the inner inclines of the
buccal cusps of the maxillary posterior teeth, guiding the movement.

Answer 8

Group function

Question 9

•Simultaneous contacts on both sides (working and non-working) during lateral
excursive movements (working side contacts and balancing side contacts)
•Contacts between the posterior and anterior teeth during protrusive movement

Answer 9

Balanced Occlusion

Question 10

AN IMAGINARY SURFACE THAT TOUCHES THE INCISAL
EDGES OF THE INCISORS AND CUSP TIPS OF THE
OCCLUDING SURFACES OF THE POSTERIOR TEETH

Answer 10

PLANE OF OCCLUSION

Question 11

_____ interferences
•Potentially destructive
•Interfere with the patient’s ability to incise properly
•Involve mesial inclines of mandibular posterior teeth and distal
inclines of maxillary posterior teeth
•Disruption of normal muscle function

Answer 11

Protrusive Interferences

Question 12

_______ interferences
•Posterior teeth
•Same side as the direction that the mand moves (working)
•Disclude anterior teeth = an interference
•Involve maxillary lingual cusps and mandibular lingual cusps and
possibly maxillary buccal cusps and mandibular buccal cusps

Answer 12

Working Interferences

Question 13

\_\_\_\_\_\_ interferences
•Opposite to direction of movement
•Particularly destructive in nature
•Potential for damage attributed  to:
1.changes in the mandibular leverage
2.forces outside the long axes of the teeth
3.disruption of normal muscle function
•Involve maxillary lingual cusps and mandibular buccal cusps

Answer 13

Non-working Interference