3 - Techniques for Determining VDO, Lab 3 (Edentulosu Record Bases and Wax Rims)

Question 1

how do you determine occlusion on edentulous patients

Answer 1

joint position and anatomical landmarks

Question 2

what are the average heights of wax rims

Answer 2

22 mm max
18 mm mand

Question 3

wax rims are adjusted for what

Answer 3

1. esthetics
2. phonetics
3. function (freeway space)

intraoraaly to determine patient VDO

Question 4

difference between natural and complete denture occlusion

Answer 4

1. Natural teeth are suspended in the bone by PDL which acts as a shock absorber
2. Denture teeth are part of the denture base which rests on movable/displaceable tissues
3. Premature, deflective contacts between artificial teeth cause movement of the denture resulting in damage to the supporting tissues

Question 5

goals of complete denture occlusion

Answer 5

1. limit trauma to supporting tissues
2. preserve remaining structures
3. create stability of dentures
4. restore esthetics, speech and mastication (function)

Question 6

what is the simultaneous contacting of maxillary and mandibular teeth on the right and left in the anterior and posterior occlusal areas when the jaws are in centric or eccentric relations

Answer 6

balanced occlusion

Question 7

is facebow (ear bow) record a joint or bite registration

Answer 7

joint

Question 8

what is a hypothetical line thru two mandibular condyles around which mandible may rotate

Answer 8

hinge axis

Question 9

what is difficult to determine in edentulous patients and requires special armamentarium (fully adjustable articulator)

Answer 9

true hinge axis

Question 10

what is an estimated axis loaction, using any current technique will place the position +/- 6 mm of the true hinge axis

Answer 10

arbitrary hinge axis

Question 11

ear bows use the external auditory meatus reference point as what

Answer 11

arbitrary hinge axis

Question 12

what refers to the length of the face

Answer 12

vertical dimension

Question 13

what is the distance between two points: fixed point at tip or base of the nose and on the movable mandible (usually chin)

Answer 13

vertical dimension

Question 14

what is the length of the face when the teet are in contact and the mandible is in CR

Answer 14

VDO

Question 15

what is the length of the face when teeth are separated and mandible is in physiologic rest position

Answer 15

VDR

Question 16

T/F: VDR equals VDO

Answer 16

FALSE!

Question 17

what is campers plane

Answer 17

bottom of ala of nose to top of tragus (ear)

Question 18

what is inter pupillary line

Answer 18

line drawn parallel from right pupil to left pupil

Question 19

average nasolabial angle for men and women

Answer 19

men 90-95 degree
women 95-105 degree

Question 20

when contour mx wax rim, lips at rest, the wax should project how many mm below lip line

Answer 20

1-2 mm

Question 21

do males or females have more tooth exposed with relaxed lip

Answer 21

Females

Question 22

the older the person, are the maxillary anterior teeth more or less visible

Answer 22

less visible

Question 23

what sounds can be used to verify length of maxillary wax rim contour

Answer 23

fricative sounds (fourty, four etc)

Question 24

mandibular occlusal plane cannot be above what

Answer 24

1/2 way up retromolar pad

Question 25

what is the opening of parotid gland near second premolar

Answer 25

parotid papilla

Question 26

what is the chiasma of facial muscles held together by fibrous tissue lateral and superior to each angle of the mouth

Answer 26

modiolus

Question 27

what is the meeting place of buccinators and other facial muscles near mouth angle

Answer 27

modiolus

Question 28

with teeth loss, the modiolus is displaced with given appearance of what

Answer 28

sunken cheeks

Question 29

T/F: the buccal surface of the lwoer denture at premolar region must be thin to avoid the modiolus lifting the denture

Answer 29

TRUE

Question 30

how to mark high lip line on mx wax rim

Answer 30

have patient say "Eeeeeew"

Question 31

the average VDR is ___ mm greater than VDO

Answer 31

2-4 mm

Question 32

in natural dentition, the teeth are separated and the degree of separation is called ___

Answer 32

free way space (2-4 mm seperation)

Question 33

what phonetics help determine VDO

Answer 33

siblants (church, six, seven) space 1-2 mm in PM area

Question 34

what phonetics determine lip support and incisal edge position

Answer 34

fricatives - F and V sounds

Question 35

what phonetics can be used to determine facial muscle relaxation

Answer 35

"m" or "emma" or hum

Question 36

how many measurements do you take to measure VDR

Answer 36

3

Question 37

what phonetic tests is ued to determine if VDO allows lip competency

Answer 37

plosive - peter picked a pickled pepper

Question 38

occlusion of opposing teeth when the mandible is in centric relation which may or may not coincide with maximum intercuspation

Answer 38

centric occlusion (CO)

Question 39

a maxillomandibular relationship in which the condyles articulate with the thinnest avascular portion of their respective discs in their most anterior superior position against the slope of the articular eminences

Answer 39

centric relation (CR)

Question 40

___ with teeth present is a tooth to tooth relation whereas ___ is a static position with a bone to bone relation

Answer 40

CO, CR

Question 41

what can be used to generate CR records

Answer 41

waxes (alu wax), impression compounds, ZOE paste

Question 42

CR is a reference point in recording what relations

Answer 42

maxillo mandibular relations

Question 43

is CR dependnt or independent of tooth contact

Answer 43

independent

Question 44

what record can be verified and repeated and is a functional position

Answer 44

CR record

Question 45

what record is the start point for developing occlusion

Answer 45

CR record

Question 46

you first establish VDR and VDO by adjusting which rim

Answer 46

lower wax rim

Question 47

how many apointments needed to make a denture

Answer 47

8 appointments

Question 48

how many appointments involve lab work

Answer 48

5

Question 49

how many appointments involve delivery of denture

Answer 49

3

Question 50

what can be placed on palate to prevent slight shrinkage of triad

Answer 50

tin foil

Question 51

how wide should the wax rim be anterior, premolar, and molar area

Answer 51

anterior: 5 mm premolar: 7 mm molar: 10 mm