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23/24 Complete Dentures > 3 - Techniques for Determining VDO, Lab 3 (Edentulosu Record Bases and Wax Rims) > Flashcards

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

1
Q

how do you determine occlusion on edentulous patients

A

joint position and anatomical landmarks

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2
Q

what are the average heights of wax rims

A

22 mm max
18 mm mand

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3
Q

wax rims are adjusted for what

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

intraoraaly to determine patient VDO

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4
Q

difference between natural and complete denture occlusion

A
  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
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5
Q

goals of complete denture occlusion

A
  1. limit trauma to supporting tissues
  2. preserve remaining structures
  3. create stability of dentures
  4. restore esthetics, speech and mastication (function)
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6
Q

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

A

balanced occlusion

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7
Q

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

A

joint

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8
Q

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

A

hinge axis

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9
Q

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

A

true hinge axis

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10
Q

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

A

arbitrary hinge axis

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11
Q

ear bows use the external auditory meatus reference point as what

A

arbitrary hinge axis

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12
Q

what refers to the length of the face

A

vertical dimension

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13
Q

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

A

vertical dimension

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14
Q

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

A

VDO

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15
Q

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

A

VDR

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16
Q

T/F: VDR equals VDO

A

FALSE!

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17
Q

what is campers plane

A

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

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18
Q

what is inter pupillary line

A

line drawn parallel from right pupil to left pupil

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19
Q

average nasolabial angle for men and women

A

men 90-95 degree
women 95-105 degree

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20
Q

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

A

1-2 mm

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21
Q

do males or females have more tooth exposed with relaxed lip

A

Females

22
Q

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

A

less visible

23
Q

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

A

fricative sounds (fourty, four etc)

24
Q

mandibular occlusal plane cannot be above what

A

1/2 way up retromolar pad

25
Q

what is the opening of parotid gland near second premolar

A

parotid papilla

26
Q

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

A

modiolus

27
Q

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

A

modiolus

28
Q

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

A

sunken cheeks

29
Q

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

A

TRUE

30
Q

how to mark high lip line on mx wax rim

A

have patient say “Eeeeeew”

31
Q

the average VDR is ___ mm greater than VDO

A

2-4 mm

32
Q

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

A

free way space (2-4 mm seperation)

33
Q

what phonetics help determine VDO

A

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

34
Q

what phonetics determine lip support and incisal edge position

A

fricatives - F and V sounds

35
Q

what phonetics can be used to determine facial muscle relaxation

A

“m” or “emma” or hum

36
Q

how many measurements do you take to measure VDR

A

3

37
Q

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

A

plosive - peter picked a pickled pepper

38
Q

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

A

centric occlusion (CO)

39
Q

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

A

centric relation (CR)

40
Q

___ with teeth present is a tooth to tooth relation

whereas

___ is a static position with a bone to bone relation

A

CO, CR

41
Q

what can be used to generate CR records

A

waxes (alu wax), impression compounds, ZOE paste

42
Q

CR is a reference point in recording what relations

A

maxillo mandibular relations

43
Q

is CR dependnt or independent of tooth contact

A

independent

44
Q

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

A

CR record

45
Q

what record is the start point for developing occlusion

A

CR record

46
Q

you first establish VDR and VDO by adjusting which rim

A

lower wax rim

47
Q

how many apointments needed to make a denture

A

8 appointments

48
Q

how many appointments involve lab work

A

5

49
Q

how many appointments involve delivery of denture

A

3

50
Q

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

A

tin foil

51
Q

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

A

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

23/24 Complete Dentures (6 decks)

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