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Clinic Prostho > Jaw Relation > Flashcards

Jaw Relation Flashcards

1
Q

What is the maximal intercuspal position (MIP)?

A

The complete intercuspation of the opposing teeth, independent of condylar position.

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2
Q

What is centric occlusion?

A

The occlusion of opposing teeth when the mandible is in centric relation (may or may not coincide with MIP).

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3
Q

Define centric relation (CR).

A

A maxillomandibular relationship where the condyles articulate in the anterior-superior position against the posterior slopes of the articular eminences; the mandible performs a purely rotary movement.

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4
Q

What is the “Transverse horizontal axis”?

A

An imaginary line around which the mandible rotates within the sagittal plane, also called the terminal hinge axis.

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5
Q

What is a protrusive movement?

A

Mandibular movement anterior to centric relation (CR).

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6
Q

Define the working-side and nonworking-side during mandibular lateral translation.

A

The working-side is where the mandible moves in a lateral excursion; the nonworking-side moves toward the medial line in a lateral excursion.

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7
Q

What is a facebow?

A

An instrument used to record the spatial relationship of the maxillary arch to anatomical reference points, transferring this relationship to an articulator.

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8
Q

What are the vertical jaw relations?

A

The amount of separation between the maxilla and mandible under specified conditions, including Rest Vertical Dimension (RVD) and Occlusal Vertical Dimension (OVD).

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9
Q

Define Rest Vertical Dimension (RVD).

A

The postural position of the mandible when an individual is upright, with muscles in minimal contraction.

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10
Q

Define Occlusal Vertical Dimension (OVD).

A

The distance between two marked points (usually on the nose and chin) when teeth are in contact.

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11
Q

What is interocclusal rest distance (freeway space)?

A

The difference between RVD and OVD.

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12
Q

What are the hazards of increased vertical dimension?

A

Bulk sensation, loss of freeway space, muscular fatigue, TMJ pain, premature occlusion, increased ridge resorption, and elongated facial appearance.

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13
Q

What are the hazards of decreased vertical dimension?

A

Aged appearance, reduced masticatory efficiency, cheek/lip biting, angular cheilitis, prognathism, and excessive freeway space.

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14
Q

What are the roles of a record base and occlusal rim?

A

Establish vertical jaw relations, occlusal planes, and midline; determine centric relation (CR); and transfer jaw relationships to an articulator.

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15
Q

What is the Bennett angle setting?

A

An average value of 15° or calculated by the formula: L = H/8 + 12, where H is the inclination of the condylar pathway.

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16
Q

What is the protrusive condylar path?

A

The path the condyle travels when the mandible is moved forward from its initial position.

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17
Q

What is protrusive condylar inclination?

A

The angle formed by the path of the moving condyles within the sagittal plane compared with the horizontal plane.

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18
Q

Define mandibular lateral translation.

A

The translatory (medio-lateral) movement of the mandible when viewed in the frontal plane.

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19
Q

What is laterotrusion?

A

Condylar lateral movement on the working-side, also known as Bennett movement.

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20
Q

Define the working-side and nonworking-side condyles.

A

The working-side condyle is the condyle on the laterotrusive side (rotating condyle), while the nonworking-side condyle is on the translating (orbiting) side.

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21
Q

What is an articulator?

A

A mechanical instrument that represents the temporomandibular joints and jaws to which casts are attached to simulate some or all maxillomandibular relations and mandibular movements.

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22
Q

What is an arbitrary facebow?

A

A facebow designed to fit directly into the external auditory meatus (EAM), measuring an average distance from the EAM to an arbitrary hinge axis.

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23
Q

How is Rest Vertical Dimension (RVD) obtained?

A

Through methods such as swallowing, sounding M, relaxation, and electromyography.

24
Q

How is Occlusal Vertical Dimension (OVD) obtained?

A

By subtracting 2-4 mm from the Rest Vertical Dimension (RVD).

25
Q

What are the signs of excessive support from the anterior portion of the occlusal rim?

A

Shallow nasolabial & mentolabial folds, smooth philtrum, and corners of the mouth appear stretched laterally.

26
Q

How is the occlusal plane aligned with anatomical landmarks?

A

It should be parallel with the Camper’s line (ala of the nose to tragus of the ear) and the interpupillary line.

27
Q

What is Christensen’s phenomenon?

A

The downward movement of the condyles and separation of the posterior teeth as the mandible protrudes.

28
Q

What is the use of an interocclusal (protrusive) record?

A

It captures the posterior separation between the occlusion rims and is used to determine the condylar path inclination.

29
Q

What is the significance of lateral interocclusal records?

A

They are used in lateral excursions to determine the Bennett angle setting.

30
Q

What is the transverse horizontal axis also known as?

A

The terminal hinge axis.

31
Q

What is the difference between the working-side and nonworking-side condyle movement during lateral excursions?

A

The working-side condyle rotates (laterotrusion), while the nonworking-side condyle translates (orbiting).

32
Q

What is the average Bennett angle setting used for articulators?

A

15 degrees.

33
Q

What is the purpose of a facebow?

A

To record the spatial relationship of the maxillary arch to anatomical reference points and transfer this to an articulator.

34
Q

What does a protrusive record capture?

A

The separation of the posterior teeth as the condyles move downward in protrusion (Christensen’s phenomenon).

35
Q

What is the formula to determine the Bennett angle setting?

A

L = H/8 + 12, where H is the inclination of the condylar path.

36
Q

What are the consequences of an improper occlusal rim providing insufficient lip support?

A

Deepening of the nasolabial and mentolabial sulci, loss of definition in the philtrum, and drooping of the corners of the mouth.

37
Q

What are the typical measurements for the anterior portion of the occlusal rim to ensure proper lip support?

A

The maxillary rim should be reduced to approximately 1 to 2 mm below the lower edge of the lip.

38
Q

What is the interocclusal rest space (IRS)?

A

The difference between the Rest Vertical Dimension (RVD) and the Occlusal Vertical Dimension (OVD).

39
Q

What factors can affect Rest Vertical Dimension (RVD)?

A

Fatigue, pain, position of the head and body, among other factors.

40
Q

What is the plane of occlusion parallel to when viewed from the front?

A

The interpupillary line.

41
Q

What is the importance of marking the corner of the mouth on the wax occlusal rim?

A

It approximates the location of the distal surface of the cuspid teeth.

42
Q

What is the function of the occlusal plane guide, like the Fox plane guide?

A

It helps ensure that the plane of occlusion is aligned correctly in relation to the anatomical landmarks like Camper’s line and the interpupillary line.

43
Q

What does the condylar path inclination refer to?

A

The angle formed by the path of the moving condyles within the sagittal plane compared to the horizontal plane during mandibular movements.

44
Q

What is the transverse horizontal axis also known as?

A

The terminal hinge axis.

45
Q

What is the difference between the working-side and nonworking-side condyle movement during lateral excursions?

A

The working-side condyle rotates (laterotrusion), while the nonworking-side condyle translates (orbiting).

46
Q

What is the average Bennett angle setting used for articulators?

A

15 degrees.

47
Q

What is the purpose of a facebow?

A

To record the spatial relationship of the maxillary arch to anatomical reference points and transfer this to an articulator.

48
Q

What does a protrusive record capture?

A

The separation of the posterior teeth as the condyles move downward in protrusion (Christensen’s phenomenon).

49
Q

What is the formula to determine the Bennett angle setting?

A

L = H/8 + 12, where H is the inclination of the condylar path.

50
Q

What are the consequences of an improper occlusal rim providing insufficient lip support?

A

Deepening of the nasolabial and mentolabial sulci, loss of definition in the philtrum, and drooping of the corners of the mouth.

51
Q

What are the typical measurements for the anterior portion of the occlusal rim to ensure proper lip support?

A

The maxillary rim should be reduced to approximately 1 to 2 mm below the lower edge of the lip.

52
Q

What is the interocclusal rest space (IRS)?

A

The difference between the Rest Vertical Dimension (RVD) and the Occlusal Vertical Dimension (OVD).

53
Q

What factors can affect Rest Vertical Dimension (RVD)?

A

Fatigue, pain, position of the head and body, among other factors.

54
Q

What is the plane of occlusion parallel to when viewed from the front?

A

The interpupillary line.

55
Q

What is the importance of marking the corner of the mouth on the wax occlusal rim?

A

It approximates the location of the distal surface of the cuspid teeth.

56
Q

What is the function of the occlusal plane guide, like the Fox plane guide?

A

It helps ensure that the plane of occlusion is aligned correctly in relation to the anatomical landmarks like Camper’s line and the interpupillary line.

57
Q

What does the condylar path inclination refer to?

A

The angle formed by the path of the moving condyles within the sagittal plane compared to the horizontal plane during mandibular movements.

Clinic Prostho (2 decks)

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