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Complete Removable Prosthodontics > Maxilla-Mandibular Relationships > Flashcards

Maxilla-Mandibular Relationships Flashcards

1
Q

Maxillomandibular Relationships (2)

A

Vertical relationship

Horizontal relationship

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2
Q

vertical relationships (2)

A

occlusal vertical relation

rest vertical relation

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3
Q

horizontal relationships (3)

A

centric relation (used in lab)
protrusive
R & L lateral (eccentric)

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4
Q

Occlusal Vertical Dimension

A

The distance between two points –one above
and one below the mouth –measured when
the occluding members are in contact.

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5
Q

physiological rest position

A

a postural position the mandible assumes when all muscles that close the haws and all the muscles that open the jaws are in a state of minimal tonic contraction sufficient only to maintain posture

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6
Q

in PRP, equilibrium exists between

A

opening and closing muscles

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7
Q

At the physiologic rest position, there should be no

contact of

A

any teeth of one arch with teeth of the

other arch.

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8
Q

Rest Vertical Dimension

A

The distance between two selected points (one
above, one below) measured when the mandible is
in its physiologic rest position.

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9
Q

Interocclusal distance (Freeway space)

A

The space between the teeth or occluding members when the

mandible is in the physiologic rest position.

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10
Q

RVD =

A

OVD + Interocclusal distance

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11
Q

Lips touch-

A

PRP

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12
Q

Space-

A

IOD (2-4mm.)

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13
Q

Teeth touch-

A

VDO

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14
Q

establishing occlusal vertical dimension (3)

A

no scientific method exists
several methods used with equal results
patients old dentures, swallowing threshold, closest speaking space, phonetics, esthetics, tactile sense, paralleling posterior ridges, pre-ext records, facial measurements

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15
Q

the interocclusal distance (free way space) is the

A

distance or gap existing between the upper and the lower teeth when the mandible is in the physiological rest position

it is usually 2-4 mm when observed at the position of the first premolars

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16
Q

the closest speaking space is the

A

closest relationship of the occlusal surfaces and incisal edges of the mandibular teeth to the maxillary teeth during function and rapid speech

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17
Q

OVD-a method (3)

A

reference marks on the nose and chin
maxillary base/rim in mouth, patient says “M” and holds lips when first touch (rest vertical dimension). record the distance between the two reference points. repeat and take average
insert mandibular base/rim. contour until meets max rim evenly at approx 3 mm less than recorded RVD

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18
Q

Verify with another method (3)

A

a) Patient swallows, then relaxes
b) Check interocclusal distance
c) Resting measurement should be greater than the occluding measurement

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19
Q

Vertical Relationships: (3)

A

OVD, RVD, Interocc.

Distance

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20
Q

Horizontal relationships: (3)

A

Centric

relation, protrusive, L & R lateral

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21
Q

centric relation (2)

A

a horizontal mandibular position at an established vertical dimension

is reproducible posterior hinge position of the mandible

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22
Q

interocclusal records: 3 parts

A
  1. max cast mounted to the correct axis by a face bow transfer
  2. mand cast mounted in centric relation position to the max cast
  3. casts mounted at the correct vertical distance from each other to allow teeth to be arranged, based placed in the mouth and teeth occlude at that vertical dimension
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23
Q

to make sure the max baseplate stays in place during the interocclusal bite registration,

A

sprinkle a small amount of denture adhesive powder on the tissue side of the denture

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24
Q

denture adhesive hygiene (2)

A

remove adhesive from the record bases before placing the record bases on the master casts
adhesive will result in denture processing errors

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25
Q

the midline and cuspid line are

A

clearly marked on the max rim

26
Q

the Mand rim is adjusted so that it fits intimately against the

A

max rim at the proper vertical dimension

27
Q

this will provide a

A

stable base for the interocclusal relationship of the maxilla to the mandible to be recorded accurately at CR

28
Q

measure the vertical dimension of occlusion (VDO) and the vertical dimension at rest (VDR) and record these neasurements on a tongue blade. the difference between the VDR and the VDO is known as

A

freeway space and is usually 2-4 mm

29
Q

boley garage technique is

A

more precise and easier to use than the tongue blade

30
Q

the mandibular rim is reduced so that there is adequate space for

A

a bite registration material (approx 2 mm).

31
Q

both rims then are scored with a sharp knife to make V shaped cuts about 2 deep that cross in the middle of the cast. this will ensure that the

A

bite registration will be stable in a lateral direction

32
Q

Recording CR on a patient (2)

A
  1. Remove 2-3 mm of wax off mand. rim distal to canine on both
    sides
  2. Place sharp notches in the wax/occlusal rims
33
Q

CR record: have patient practice closing gently in a — position before making the final record

A

retruded

34
Q

making CR records consists of two phases:

A
  1. getting the entire mandible retruded (bimanual technique)
  2. positioning the condyle-disc assembly in the uppermost anterior position
35
Q

steps 3-6

A
  1. practice with patient
  2. place recording material on posterior rim
  3. hold bases in place and guide patient to slow closure on back teeth
  4. hold until material is set
36
Q

recording jaw relations: why might you remake?

A

if there is contact between the max and mand rims or bases during the registration

37
Q

verify records (3)

A 
bases may be returned to mouth, jaw retruded and closure made to verify that correct contact occurs 
additional record(s) may be made and used to verify the first record 
if in doubt, remake record and remount cast
38
Q

The importance of accurate interocclusal records and accurately
mounted casts merit extra time — with the patient.

A

practicing

39
Q

Great — is often required of both the patient and the dentist if
accurate records are to be made.

A

patience

40
Q

factors that affect the CR record (6)

A
  • resiliency of the tissues supporting the denture bases
  • stability and retention of record bases
  • the tempura-mandibular joint and its neurons muscular mechanism
  • technique employed in making the records
  • amount of pressure applied in making the records
  • the skill of the dentist
41
Q

registration should be —, not —

A

sharp

rounded

42
Q

1880 –

A

Hayes –“caliper”

43
Q

1900 –

A

Gysi –transfer maxillary cast

44
Q

1900 –

A

Snow –most instruments used today are modifications of Snow’s

45
Q

Facebow

A

Instrument that carries the relationship between the maxillae and the
condyles from the patient to the articulator.

46
Q

Facebow Types (2)

A

Arbitrary

Kinematic

47
Q

Arbitrary –

A

an arbitrary axis is used (external auditory meatus, etc)

48
Q

Kinematic –

A

the transverse hinge axis is located and used

49
Q

Arbitrary facebow -

Uses arbitrary landmarks of the face/head to

A

approximate the

rotational centers of the mandible.

50
Q

Kinematic facebow

Locates exact

A

hinge axis points on skin, then transfers cast to articulator in
accurate relation to these points- not necessary for dentures!

51
Q

if arbitrary location of hinge axis is within 5 mm of transverse hinge axis, and a CR record of 3 mm thickness is used to mount the mandibular cast, the AP error is approx

A

0.2 mm in second molar region

52
Q

arbitrary face bow is accurate enough for

A

CD fabrication

53
Q

the face bow transfer: purpose

A

to orient the max cast to the articulator in the same relationship to the opening/closing axis of the articulator as exists between the maxillae and the opening/closing axis of the TM joints of the patient

54
Q

a simple procedure to orient the max cast at a reasonably accurate radius from the

A

opening axis

55
Q

a third point of reference transfers

A

elevation of cast in relation to the axis orbital plane of the patient

56
Q

face bow transfer should be used when (4)

A
  1. cusp form posterior teeth are used
  2. balanced occlusion in eccentric positions is desired
  3. interocclusal records are used to verify jaw positions/ cast mounting
  4. occlusal vertical dimension is subject to change
57
Q

how many articulators are there?

A

over 300, from simple to complex

58
Q

Semi-adjustable Articulator (3)

A

Accepts facebow record
Accepts interocclusal records
Has individually adjustable condylar guidances - vertical and horizontal

59
Q

Fully Adjustable Articulator-Not

needed for

A

complete dentures

60
Q

Denar, fully adjustable, not for

denture fabrication, use for

A

FIXED

Complete Removable Prosthodontics (20 decks)

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