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Occlusion > Midterm > Flashcards

Midterm Flashcards

1
Q

3 Requisites of Contour

A

Mechanical
Biological
Esthetics

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2
Q

Mechanical Requisites of Contour

A

Movements and occlusion with other teeth

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3
Q

Biological Requisites of Contour

A

Ex. Preventing over contour to decrease chances of periodontal disease

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4
Q

Esthetics Requisites of Contour

A

Most difficult. The smallest change in contour can have very noticeable effects on patients appearance

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5
Q

Universal Occlusal Stand

A

Should be adjusted to be 10 degrees inclination

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6
Q

Fence

A

Maxillary models should be oriented so that the midline is centralized onto the inscribed midline of the fence

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7
Q

Condylar Guides

A

Should be 30 Degrees

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8
Q

Incision guide pin

A

Should be 0

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9
Q

The Geometric (Non-Anatomical) School of articulator designs

A

Denied existence of condylar axes and disregarded the consular paths as influences on occlusion. Instead, claiming that the articulation of teeth guides the mandible during mastication

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10
Q

The Condylar (anatomical) School of Articulator Design

A

Adjustable condylar guides

Average value instruments

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11
Q

Equilateral Triangle Theory

A

The size of the mandible is equal to 10 cm from condyle to condyle (4 inches) and from each condylar to the incisor point

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12
Q

Balkwill Angle

A

Triangle is formed between the occlusal plane and Bonwill triangle (about 26 Degrees)

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13
Q

Curve of Spee

A

Teeth are not flat, they have a curve

The molar mastication surface lie on the same arc of a circle. The posterior continuation of which touches the most anterior point of the condyle

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14
Q

The location of the axis of the cylinders curvature is at

curve of spee

A

The level of the horizontal mid orbital plane

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15
Q

The steeper the path of the condyle the_______ the tooth curve would be because_______

A

More pronounced

Because both have the same radius

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16
Q

Christensen’s Phenomeneon

A

The space that occurs between the maxilla and mandible during protrusion

The phenomenon of a space that occurs between mandible and maxilla when anterior teeth touch and the mandible protrudes

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17
Q

Christensen’s Rational Articulator

A

The first to describe an intraoral method for obtaining a protrusive record to determine the condylar inclination

“Arrangement of teeth is NOT flat”

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18
Q

Monson’s Spherical Theory

A

You always need to find the center of rotation

“All teeth are touching the sphere plane”

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19
Q

Curve of Wilson

A

Mediolateral Curve

In the theory that occlusion should be spherical, the curvature of the cusps as projected on the FRONTAL plane expressed in both arches; the curve in the lower arch being CONCAVE and the one in the upper arch being CONVEX

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20
Q

Curve of Spee__________

Curve of wilson______

A 
Spee= anteroposterior
Wilson= mediolateral
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21
Q

Rupert Hall’s Conical Theory of Mandibular Movements

A

The external occipital protuberance was considered as the anatomic ratio center of the mandible (about 10 cm from the mandible)

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22
Q

ARCON

A

Articulating condyle

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23
Q

Universal occlusal stand relates to

A

Bonwills equilateral triangle

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24
Q

3 Requisites in contour

A

Mechanical
Biological
Esthetics

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25
Q

Occlusal Stand inclination

A

10 degrees

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26
Q

Condylar guide

A

30 degrees

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27
Q

Incisal guid pin

A

Zero

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28
Q

VDO

A

Vertical Dimension of occlusion

The degree of separation (distance between) the maxillae and the mandible

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29
Q

VDO when in MI

A

0

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30
Q

THA

A

Transverse horizontal axis

Where rotation occurs
Is an imaginary line connecting the centers of two condyles

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31
Q

The rotational movement is limited to

A

About 20-25 mm of incisal separation before the mandible begins to translate

32
Q

Centric Relation

A

A spatial relationship of one bone to another; the mandible and maxilla or cranium.

Independent of tooth contacts
Condyles articulate with the thinnest avascular portion of their respective disks
Against Articulator eminences

33
Q

Centric Relation arc of Closure

A

When the mandible is guided to CR the arc traced by the point between 2 mandibular central incisors is referred to as the arc of closure

34
Q

Centric Occlusion

A

If the mandible is manipulated upward on the centric relation arc of closure until tooth contact occurs the mandible is now in CO

35
Q

Initial Points of contact

A

These contact points are located on the distal inclines of mandibular teeth and the mesial inclines of the maxillary teeth

36
Q

Sagittal Plane

A

Rotational Movement

37
Q

Horizontal Plane

A

Straight protrusive

Lateral movements

Working slight lateral translation
Non working travels forward and medial

38
Q

Frontal Plane

A

Straight protrusive movements. Both condyles will move downward as they slide along emmincens.

Working-rotate and move lateral and upward or lateral and downward

Non working downward and medial

39
Q

VDO

A

Vertical dimension of occlusion

The distance between two reference pints with the teeth in MI

40
Q

VDR

A

Vertical dimension at rest

The distance between two points with the mandible at rest

41
Q

Interocclusal rest distance

A

VDR-VDO

42
Q

Incisal guidance

A

Anterior teeth guided by incisal guidance

Posterior guided by artocular eminence

43
Q

Functions of Anterior Teeth

A 
Anterior Guidance
Perform initial acts of mastication
Speech 
Lip Support
Esthetics
44
Q

Anterior Guidance

A

1) Position of the incisively edge of the mandibular anterior teeth relative to the lingual surfaces of the maxillary anterior teeth
2) Changes in morphology of the lingual surfaces of maxillary anterior teeth
3) length of mandibular incisors or canines

45
Q

Occlusal Schemes

A

Anterior Guidance

  • Incisal Guidance
  • Canine Guidance

Group Function

46
Q

Acron articulator

A

Condyles connected to the lower member

47
Q

Non arcon Articulator s

A

Condyles connected tot heir upper members

48
Q

Significance of Ear Bow Transfer

A

1) Relates maxillary cast to the Terminal Hinge Axis
2) Orients the maxillary cast correctly in space using a third point of reference
3) Is aligned parallel to the inter pupillary line
4) Permits mounting of the maxillary cast on a semi adjustable articulator
5) The mandibular cast is mounted using a centric relation record

49
Q

CR Record

A 
Along the arc of rotation of the mandible
No teeth touching
Thin
Soft
Fast setting
Stable
Verifiable
50
Q

Goals of Occlusal Equilibration

A

To improve functional and esthetic relationships between maxillary and mandibular teeth

To eliminate TMD

51
Q

The shorter the slide

A

The more likely it is that selective grinding can be accomplished within the confines of the enamel

52
Q

Selective Grinding

A

A procedure by which the occlusal surface of the teeth are altered to improve the overal contact pattern.

53
Q

When the slide has a great horizontal component

A

It becomes difficult to eliminate within the conies of the enamel

Flat cusps

54
Q

Mandibular Excursions

A

Locate tooth in the arch
Determine if it moves
Identify movement

55
Q

When the earbow transfer is used which 3 things become anatomically oriented

A

Maxillary arch
Mandibular Arch
Condylar Axis

56
Q

Requirements of Centric Relation Record

A

Along the arc of rotation of the mandible
No teeth touching
Fast setting
Thin
Soft
Dimensionally stable
Easily verifiable in the mouth and on the mounted casts

57
Q

Occlusal Equlibration

A

Refers to the correction of stressful occlusal contacts through selective grinding. It involves the selective reshaping of tooth surfaces that interfere wit normal harmonious jaw function

58
Q

Anterior teeth guide ______ movements of the _____ so that no _______ teeth contact during lateral or protrusive movements

A

Excursive
Mandible
Posterior

59
Q

In maximal intercuspal position posterior teeth______

A

Come into contact and act as stops to minimize horizontal load on anterior teeth

60
Q

In maximal intercuspal position all mandibular teeth

A

Should contact their maxillary opponents at the same time and with the same intensity

CO should coincide with MI

61
Q

Incisal Guidance

A

Immediate discussion of posterior teeth takes place on mandibular protrusion

62
Q

Canine Guidance

A

Immediate discussion of posterior teeth takes place as soon as the lateral movement begins

63
Q

Group Function

A

The mandibular buccal working cusps travel downward, forward and lateral in contact with the lingual inclines of the maxillary buccal cusps simultaneously with the canine

64
Q

Equilibration Procedures

A

Reduction of all contacting tooth surfaces that interfere with the terminal hinge axis closure

Selective reduction of tooth structure that interferes with lateral excursions

Elimination of all posterior tooth structure that interferes with protrusive excursions

Harmonization of the anterior guidance

65
Q

Anterior Slide correction

A

MUDL

66
Q

MUDL

A

Corrects anterior slide

Mesial inclines upper

Distal inclines lower

67
Q

Interference of the arc of closure

A

Has the effect of displacing the mandible forward of the interference to reach MI

68
Q

Interference of the line of Closure

A

Primary interferences that cause the mandible tod evictee right or left from the initial contact point to MI

69
Q

If the interfering incline causes the mandible to deviate toward the cheek

A

BULL

70
Q

BULL

A

If the interfering incline causes the mandible to deviate toward the cheek

Grind the buccal incline of the upper
lingual incline of the lower
or both

71
Q

If the interfering incline causes the mandible to deviate toward the tongue

A

LUBL

72
Q

LUBL

A

If the interfering incline causes the mandible to deviate toward the tongue

Grind the lingual incline of the upper
Buccal incline of the lower
Or both

73
Q

Centric Interferences

A

To the arc of closure

Line of closure

74
Q

Lateral Interferences (on opening)

A

Divided into interferecens of the working side or non working side

75
Q

Non working interferences on opening

A

BULL

76
Q

Working side interference on opening

A

Use LUBL to get anterior guidance preferably

77
Q

Rule for eliminating protrusive interferences

A

DUML

Occlusion (2 decks)

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