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Midterm Flashcards

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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
Occlusal Stand inclination
10 degrees
26
Condylar guide
30 degrees
27
Incisal guid pin
Zero
28
VDO
Vertical Dimension of occlusion The degree of separation (distance between) the maxillae and the mandible
29
VDO when in MI
0
30
THA
Transverse horizontal axis Where rotation occurs Is an imaginary line connecting the centers of two condyles
31
The rotational movement is limited to
About 20-25 mm of incisal separation before the mandible begins to translate
32
Centric Relation
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
Centric Relation arc of Closure
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
Centric Occlusion
If the mandible is manipulated upward on the centric relation arc of closure until tooth contact occurs the mandible is now in CO
35
Initial Points of contact
These contact points are located on the distal inclines of mandibular teeth and the mesial inclines of the maxillary teeth
36
Sagittal Plane
Rotational Movement
37
Horizontal Plane
Straight protrusive Lateral movements Working slight lateral translation Non working travels forward and medial
38
Frontal Plane
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
VDO
Vertical dimension of occlusion The distance between two reference pints with the teeth in MI
40
VDR
Vertical dimension at rest The distance between two points with the mandible at rest
41
Interocclusal rest distance
VDR-VDO
42
Incisal guidance
Anterior teeth guided by incisal guidance Posterior guided by artocular eminence
43
Functions of Anterior Teeth
``` Anterior Guidance Perform initial acts of mastication Speech Lip Support Esthetics ```
44
Anterior Guidance
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
Occlusal Schemes
Anterior Guidance - Incisal Guidance - Canine Guidance Group Function
46
Acron articulator
Condyles connected to the lower member
47
Non arcon Articulator s
Condyles connected tot heir upper members
48
Significance of Ear Bow Transfer
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
CR Record
``` Along the arc of rotation of the mandible No teeth touching Thin Soft Fast setting Stable Verifiable ```
50
Goals of Occlusal Equilibration
To improve functional and esthetic relationships between maxillary and mandibular teeth To eliminate TMD
51
The shorter the slide
The more likely it is that selective grinding can be accomplished within the confines of the enamel
52
Selective Grinding
A procedure by which the occlusal surface of the teeth are altered to improve the overal contact pattern.
53
When the slide has a great horizontal component
It becomes difficult to eliminate within the conies of the enamel Flat cusps
54
Mandibular Excursions
Locate tooth in the arch Determine if it moves Identify movement
55
When the earbow transfer is used which 3 things become anatomically oriented
Maxillary arch Mandibular Arch Condylar Axis
56
Requirements of Centric Relation Record
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
Occlusal Equlibration
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
Anterior teeth guide ______ movements of the _____ so that no _______ teeth contact during lateral or protrusive movements
Excursive Mandible Posterior
59
In maximal intercuspal position posterior teeth______
Come into contact and act as stops to minimize horizontal load on anterior teeth
60
In maximal intercuspal position all mandibular teeth
Should contact their maxillary opponents at the same time and with the same intensity CO should coincide with MI
61
Incisal Guidance
Immediate discussion of posterior teeth takes place on mandibular protrusion
62
Canine Guidance
Immediate discussion of posterior teeth takes place as soon as the lateral movement begins
63
Group Function
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
Equilibration Procedures
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
Anterior Slide correction
MUDL
66
MUDL
Corrects anterior slide Mesial inclines upper Distal inclines lower
67
Interference of the arc of closure
Has the effect of displacing the mandible forward of the interference to reach MI
68
Interference of the line of Closure
Primary interferences that cause the mandible tod evictee right or left from the initial contact point to MI
69
If the interfering incline causes the mandible to deviate toward the cheek
BULL
70
BULL
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
If the interfering incline causes the mandible to deviate toward the tongue
LUBL
72
LUBL
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
Centric Interferences
To the arc of closure Line of closure
74
Lateral Interferences (on opening)
Divided into interferecens of the working side or non working side
75
Non working interferences on opening
BULL
76
Working side interference on opening
Use LUBL to get anterior guidance preferably
77
Rule for eliminating protrusive interferences
DUML

Occlusion (2 decks)

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