Maxilla-Mandibular Relationships

Question 1

Maxillomandibular Relationships (2)

Answer 1

Vertical relationship

Horizontal relationship

Question 2

vertical relationships (2)

Answer 2

occlusal vertical relation

rest vertical relation

Question 3

horizontal relationships (3)

Answer 3

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

Question 4

Occlusal Vertical Dimension

Answer 4

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

Question 5

physiological rest position

Answer 5

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

Question 6

in PRP, equilibrium exists between

Answer 6

opening and closing muscles

Question 7

At the physiologic rest position, there should be no

contact of

Answer 7

any teeth of one arch with teeth of the

other arch.

Question 8

Rest Vertical Dimension

Answer 8

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

Question 9

Interocclusal distance (Freeway space)

Answer 9

The space between the teeth or occluding members when the

mandible is in the physiologic rest position.

Question 10

RVD =

Answer 10

OVD + Interocclusal distance

Question 11

Lips touch-

Answer 11

PRP

Question 12

Space-

Answer 12

IOD (2-4mm.)

Question 13

Teeth touch-

Answer 13

VDO

Question 14

establishing occlusal vertical dimension (3)

Answer 14

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

Question 15

the interocclusal distance (free way space) is the

Answer 15

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

Question 16

the closest speaking space is the

Answer 16

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

Question 17

OVD-a method (3)

Answer 17

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

Question 18

Verify with another method (3)

Answer 18

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

Question 19

Vertical Relationships: (3)

Answer 19

OVD, RVD, Interocc.

Distance

Question 20

Horizontal relationships: (3)

Answer 20

Centric

relation, protrusive, L & R lateral

Question 21

centric relation (2)

Answer 21

a horizontal mandibular position at an established vertical dimension

is reproducible posterior hinge position of the mandible

Question 22

interocclusal records: 3 parts

Answer 22

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

Question 23

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

Answer 23

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

Question 24

denture adhesive hygiene (2)

Answer 24

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

Question 25

the midline and cuspid line are

Answer 25

clearly marked on the max rim

Question 26

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

Answer 26

max rim at the proper vertical dimension

Question 27

this will provide a

Answer 27

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

Question 28

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

Answer 28

freeway space and is usually 2-4 mm

Question 29

boley garage technique is

Answer 29

more precise and easier to use than the tongue blade

Question 30

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

Answer 30

a bite registration material (approx 2 mm).

Question 31

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

Answer 31

bite registration will be stable in a lateral direction

Question 32

Recording CR on a patient (2)

Answer 32

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

Question 33

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

Answer 33

retruded

Question 34

making CR records consists of two phases:

Answer 34

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

Question 35

steps 3-6

Answer 35

3. practice with patient 4. place recording material on posterior rim 5. hold bases in place and guide patient to slow closure on back teeth 6. hold until material is set

Question 36

recording jaw relations: why might you remake?

Answer 36

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

Question 37

verify records (3)

Answer 37

``` 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 ```

Question 38

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

Answer 38

practicing

Question 39

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

Answer 39

patience

Question 40

factors that affect the CR record (6)

Answer 40

- 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

Question 41

registration should be ---, not ---

Answer 41

sharp | rounded

Question 42

1880 –

Answer 42

Hayes –“caliper”

Question 43

1900 –

Answer 43

Gysi –transfer maxillary cast

Question 44

1900 –

Answer 44

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

Question 45

Facebow

Answer 45

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

Question 46

Facebow Types (2)

Answer 46

Arbitrary | Kinematic

Question 47

Arbitrary –

Answer 47

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

Question 48

Kinematic –

Answer 48

the transverse hinge axis is located and used

Question 49

Arbitrary facebow - | Uses arbitrary landmarks of the face/head to

Answer 49

approximate the | rotational centers of the mandible.

Question 50

Kinematic facebow | Locates exact

Answer 50

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

Question 51

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

Answer 51

0.2 mm in second molar region

Question 52

arbitrary face bow is accurate enough for

Answer 52

CD fabrication

Question 53

the face bow transfer: purpose

Answer 53

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

Question 54

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

Answer 54

opening axis

Question 55

a third point of reference transfers

Answer 55

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

Question 56

face bow transfer should be used when (4)

Answer 56

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

Question 57

how many articulators are there?

Answer 57

over 300, from simple to complex

Question 58

Semi-adjustable Articulator (3)

Answer 58

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

Question 59

Fully Adjustable Articulator-Not | needed for

Answer 59

complete dentures

Question 60

Denar, fully adjustable, not for | denture fabrication, use for

Answer 60

FIXED