Occlusion for the Partially Edentulous Patient

Question 1

what is mutually protected occlusion also known as

Answer 1

optimal functional occlusion

Question 2

what is mutually protectde occlusion

Answer 2

• multiple, even, bilateral, simultaneous contacts of the posterior teeth in MIP with the mandible in CR position
• MIP and CR are coincident

Question 3

the anterior teeth exhibit _____ occlusal contacts as compared to posterior teeth in MIP

Answer 3

lighter

Question 4

posterior teeth are axially loaded in _____

Answer 4

MIP

Question 5

in excursive movements there is_____ guidance and _____ guidance

Answer 5

canine and anterior

Question 6

anterior teeth protect ____ and vice versa

Answer 6

posterior teeth

Question 7

the _____ teeth withstand the majority of the load in MIP, protecting anterior teeth from high loads

Answer 7

posterior

Question 8

the anterior teeth disclude the posterior teeth in _________ movements, thereby protecting the posterior teeth from off axis loading

Answer 8

excursive movements

Question 9

what are the occlusal schemes during excursive movements

Answer 9

• canine guidance- anterior guidance
• group function (unilateral balance)
• balanced occlusion ( bilateral balance)

Question 10

where do you begin?

Answer 10

• evaluate the current condition of teeth, supporting structures, intra-oral and peri-oral tissues
• and occlusion

Question 11

what do you use to evaluate occlusion

Answer 11

intraorally and on articulated diagnostic casts

Question 12

what is canine guidance

Answer 12

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

Question 13

what is anterior guidance

Answer 13

the anterior teeth disclude the posterior teeth when the mandible moves in protrusion

Question 14

what discludes the posterior teeth when the mandible moves in protrusion

Answer 14

the canines, central and lateral incisors

Question 15

contacts between the posterior teeth during excursive movements are considered _____ that can create damaging effects on teeth and periodontium

Answer 15

interferences

Question 16

mandible is a class ____ lever

Answer 16

III

Question 17

the more anterior the resistance occurs, the ____ the impact

Answer 17

lesser

Question 18

more anterior is ____ from the fulcrum

Answer 18

further

Question 19

which tooth has the longest root and best bone support

Answer 19

canine

Question 20

what are the anterior controlling factors

Answer 20

• anterior teeth
• anterior guidance

Question 21

what determines how the anterior portion of the mandible moves

Answer 21

anterior teeth

Question 22

what is anterior guidance controlled by

Answer 22

position and contours of anterior teeth

Question 23

what is anterior guidance altered by

Answer 23

• restorations
• orthodontics
• extractions
• caries
• habits
• tooth wear

Question 24

anterior guidance is a ____ factor rather than a fixed factor

Answer 24

variable

Question 25

what is the anterior guidance angle

Answer 25

the angle formed by the intersection of the horizontal plane and the disclusive pathway of the anterior teeth

Question 26

what is anterior guidance angle influenced by

Answer 26

- vertical overlap (VO) - horizontal overlap (HO)

Question 27

what does increased VO angle do to anterior guidance angle

Answer 27

increases it

Question 28

what does increased HO overlap do to anterior guidance angle

Answer 28

decreases it

Question 29

increased anterior guidance angle:

Answer 29

-allows steeper cusps on posterior teeth - decreases the likelihood for occlusal interferences

Question 30

what is group function

Answer 30

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

Question 31

what is balanced occlusion

Answer 31

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

Question 32

what patients is balanced occlusion not acceptable for and why

Answer 32

- for dentate patients - promotes tooth wear on natural teeth - non working side contacts are extremely destructive and must be avoided

Question 33

when is balanced occlusion an acceptable form of occlusion

Answer 33

for removable prostheses

Question 34

describe malocclusion

Answer 34

- lack of posterior occlusion - significant wear of maxillary and mandibular anterior teeth - mandibular anterior teeth are aupraerupted - posterior teeth are supraerupted

Question 35

what is the plane of occlusion

Answer 35

an imaginary surface that touches the incisal edges of the incisors and cusp tips of the occlusing surfaces of the posterior teeth

Question 36

the plane of occlusion curves to fit the _____ and _____ of all the teeth

Answer 36

occlusal surfaces and incisal edges

Question 37

is the plane of occlusion flat

Answer 37

no

Question 38

plane of occlusion is ____ on the mandible

Answer 38

concave

Question 39

plane of occlusion is ______ on the maxilla

Answer 39

convex

Question 40

what is an interference

Answer 40

any unwanted or premature interocclusal contact

Question 41

what are the types of occlusal interferences

Answer 41

- centric interferences - working side interferences - non working side interferences - protrusive interferences

Question 42

why do we need to eliminate occlusal interferences

Answer 42

- potentially destructive - interfere with the patients ability to incise properly -involve mesial inclines of mandibular posterior teeth and distal inclines of maxillary posterior teeth - disruption of normal muscle function

Question 43

where are working interferences located

Answer 43

- posterior teeth - same side as the direction that the mandible moves (working) - disclude anterior teeth = an interference - involves maxillary buccal cusps and mandibular buccal cusps and/or maxillary lingual cusps and mandibular lingual cusps

Question 44

describe non working interferences

Answer 44

- opposite to direction of movement - particularly destructive in nature - involves maxillary lingual cusps and mandibular buccal cusps

Question 45

the potential for damage in non working side interferences is attributed to:

Answer 45

- changes in the mandibular leverage - forces outside the long axes of the teeth - disruption of normal muscle function

Question 46

what are the RPD treatments in predoctoral clinic at UMKC

Answer 46

- completed axium record - diagnostic casts - survey of casts and proposed design - articulation of casts and occlusal analysis of exisiting conditions and propposed treatment

Question 47

for most situations you should maintain the existing _____ dimension

Answer 47

occlusal vertical

Question 48

ensure adequate _______ space with a suitable occlusal plane

Answer 48

interarch/interocclusal space