1/29: Maxillo-Mand Records

Question 1

What are the two maxillomandibular relationships?

Answer 1

Vertical and horizontal relationships

Question 2

What are the two vertical relationships?

Answer 2

Occlusal vertical dimension (OVD), rest vertical dimension (RVD)

Question 3

What are the 3 horizontal relationships?

Answer 3

Centric relation (CR), protrusive, R & L lateral (“eccentric”)

Question 4

What is 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

What is physiological rest position?

Answer 5

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

Question 6

What exists between opening and closing muscles in physiologic rest poisition?

Answer 6

Equilibrium

Question 7

At the physiologic rest position, there should be ______ contact of any teeth of one arch with teeth of the other arch

Answer 7

No

Question 8

What is physiologic 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

What is the interocclusal distance (IOD) aka 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

RVD = OVD + Interocclusal distance (IOD)

Question 11

What is the closest speaking space?

Answer 11

Closest relationship of the occlusal surfaces and incisal edges of the mandibular teeth to the maxillary teeth during function and rapid speech
- saying words with “S” in them– teeth shouldn’t touch

Question 12

How to get the OVD?

Answer 12

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

Question 13

What are examples of vertical relationships?

Answer 13

OVD, RVD, interocc. distance

Question 14

What are examples of horizontal relationships?

Answer 14

Centric relation, protrusive, L&R lateral

Question 15

What is centric relation?

Answer 15

Horizontal mandibular position at an established vertical dimension

Question 16

Centric relation is what in relation to the mandible?

Answer 16

Centric relation is a reproducible posterior hinge position of the mandible

Question 17

What are objectives of recording jaw relationships?

Answer 17

1. Maxillary cast mounted to the correct axis by a facebow transfer
2. Mandibular 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, bases placed in the mouth and teeth occlude at the vertical dimensions

Question 18

When should the adhesive from the record bases be removed?

Answer 18

BEFORE placing the record bases on the master casts
*adhesive remaining will result in denture processing errors

Question 19

What is the difference between the VDR and VDO known as?

Answer 19

Freeway space and is usually 2-4mm anteriorly

Question 20

Making centric relation records consist of two phases:

Answer 20

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

Question 21

What are factors that affect the centric relation?

Answer 21

1. Resiliency of the tissues supporting the denture bases
2. Stability and retention of record bases
3. The tempro-mandibular joint and its neuromuscular mechanism
4. Technique employed in making the records
5. Amount of pressure applied in making the records
6. The skill of the dentist

Question 22

What is a facebow?

Answer 22

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

Question 23

What are the two facebow types?

Answer 23

Arbitrary
Kinematic

Question 24

What is an arbitrary facebow?

Answer 24

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

Question 25

What is a kinematic facebow?

Answer 25

The exact transverse hinge axis is located and used

Question 26

Use arbitrary landmarks of the face/head to ___________ of the mandible

Answer 26

approximate the rotational centers

Question 27

What does the kinematic facebow locate and transfer?

Answer 27

Locates exact hinge axis point on skin
Transfers cast to articulator in accurate relation to these points (not necessary for dentures)

Question 28

What is the purpose of the facebow transfer?

Answer 28

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

Question 29

What does a third point of reference transfer?

Answer 29

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

Question 30

Facebow transfer should be used when:

Answer 30

1. Cusp from posterior teeth are used
2. Balanced occlusion in eccentric positions is desired
3. Interocclusal records are sued to verify jaw positions/cast mountings
4. The occlusal vertical dimension is subject to change

Question 31

What does a semi-adjustable articulator accept?

Answer 31

Facebow records and interocclusal records

Question 32

A semi-adjustable articulator has individually adjustable _______

Answer 32

Condylar guidances - vertical and horizontal

Question 33

What kind of articulator is not needed for complete dentures?

Answer 33

Fully adjustable articulator

Question 34

Denar, fully adjustable, not for denture fabrication are used for _______

Answer 34

Fixed