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Occlusion > Introduction Articulators and Facebows > Flashcards

Introduction Articulators and Facebows Flashcards

1
Q

TYPES OF RESTORATIVE MATERIALS FOR TEETH (5)

A 
dental amalgam
composite materials 
gold restorations (gold foil)
gold castings (inlays, onlays, crowns)
ceramics
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2
Q

ceramics includes (3)

A

crowns
bridges (fixed partial dentures)
veneers

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3
Q

CONCERNS ABOUT DENTAL AMALGAM AS RESTORATIVE MATERIAL (8)

A

poor aesthetics compared to resin composites
weakening of tooth from removal of tooth structure
recurrent caries
no adhesive bonding unless bonded restoration
sensitivity of properties to manipulation
brittle nature of material
biocompatibility (not generally considered problem for patients)
wastewater pollution with mercury

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4
Q

CONCERNS ABOUT DENTAL AMALGAM AS RESTORATIVE MATERIAL (8)

A

poor aesthetics compared to resin composites
weakening of tooth from removal of tooth structure
recurrent caries
no adhesive bonding unless bonded restoration
sensitivity of properties to manipulation
brittle nature of material
biocompatibility (not generally considered problem for patients)
wastewater pollution with mercury

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5
Q

downside of dental amalgam restorations (2)

upside (1)

A

mercury
not aesthetically pleasing

repairs itself over time

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6
Q

dental composite advantages (5)

A 
aesthetics
bonding to tooth structure
can be more conservative in the preparation of the tooth
less expensive than ceramic
reduced mercury
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7
Q

dental composite disadvantages (6)

A

shrinkage
durability
chipping
more skill and training required
need to keep working area in mouth completely dry
time and expenses (20 more min longer per restoration)

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8
Q

bonding allows the dentist to use dental composites on teeth to change (3)

A

shape, color, contours

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9
Q

oldest type of filling material available

A

gold foil/direct gold

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10
Q

how long does gold last

A

can last the lifetime of the patient

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11
Q

— — can be placed in one visit in small cavities and will last longer than any other restorative material

A

pure gold

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12
Q

average cost of metal in a cast gold crown

A

250 dollars

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13
Q

cost of a full gold crown can be over

A

300 dollars

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14
Q

why can aesthetics be a problem?

A

depends on your personal concept of aesthetics

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15
Q

“How Long Will PFM Crowns Last?” (3)

A

95% success rate between 5-10 years in cross-sectional
study
97.5% success rate at 7 years
95.5% at 7 years assessed in private practices

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16
Q

tooth replacement options with implants (3)

A

complete dentures
partial dentures
fixed bridge and single teeth

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17
Q

skipped:

High Strength Ceramics (6)

A
  • Broad range of indications
  • • Excellent clinical performance
  • • Accepted metal alternative
  • • Less tooth reduction required
  • • Thinner coping thicknesses
  • • Shaded coping options offer improved esthetics
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18
Q

articulator

A

a mechanical device that simulates mandibular movements of condyles in their fossae

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19
Q

uses of the articulator (4)

A

diagnosis
treatment planning
communicate with patients/patient education
fabrication of protheses/restorations

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20
Q

components of the articulator (5)

A 
upper member 
lower member 
anterior or incisal pin
condylar mechanisms 
mounting ring (guide and retention system)
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21
Q

non adjustable or hinge articulators allow only — movements

A

opening and closing

22
Q

non adjustable articulators can be usde for

A

single posterior restoration

23
Q

the use of a non adjustable articulator can create a change in the — —, and by doing so the final restoration will present premature contacts

A

closure angle

24
Q

articulator used the most

A

semi-adjustable

25
Q

semi adjustable articulators allow for (3) movements

A

opening and closing movements as well as excursive lateral and protrusive movements

26
Q

Types of Semi-Adjustable Articulators: (2)

A

arcon

non arcon

27
Q

arcon (2)

A
  • Condyles in lower member

- Condylar inclination in the upper member

28
Q

non arcon (2)

A

Condyles on upper member

Condylar inclination on the lower member

29
Q

what type of articulator is our articulator?

A

arcon articulator

30
Q

purpose of the facebow

A

orient the maxillary cast to the rotational axis in three planes

31
Q

using a facebow will result in reproducible articulation of the subsequent — casts

A

maxillary

32
Q

the facebow orients the dental cast in the same relationship to the

A

opening axis of the articulator

33
Q

usually the anatomic references are the (2)

A

mandibular condyles transverse horizontal axis and one other selected anterior point

34
Q

kinematic locates the

A

true transverse horizontal axis of rotation

35
Q

arbitrary locates the

A

axis by using anatomical landmarks

36
Q

arbitrary utilizes — — to approximately locate the axis of rotation

A

average measurements

37
Q

transverse horizontal axis (terminal hinge axis)

A

imaginary axis which passes through each of the mandibular condyles

38
Q

it is around the transverse horizontal axis that the — of the mandible occurs

A

pure rotational movement of the mandible

39
Q

the transverse horizontal axis is about – mm under the soft tissues in the front of the — (on each side of the face)

A

8 mm

tragus

40
Q

Bergstrom point

A

a point 10 mm anterior to the center of a spherical insert in the external auditory meatus and 7 mm below the Frankfort horizontal plane

41
Q

Ear-bow

A

Indexes to external auditory meatus and registers the relation of the max arch to these and a horizontal reference plane

42
Q

the facebow orients the maxillary cast to a

A

reference plane

43
Q

the reference plane requires – points

A

3

two on each side of the face and one on the anterior face

44
Q

the anterior reference point is also known as the

A

3rd point of reference

45
Q

the 3rd point of reference should be (2)

A

repeatable and reproducible

46
Q

3rd point of reference (5)

A 
orbitale 
nasion
maxillary incisor incisal edge 
lower edge of the nostril
parallel to the upper and lower arms of the articulator
47
Q

orbitale

A

the lowest point on the intra orbital rim (spring bow)

48
Q

nasion

A

whip mix

49
Q

maxillary incisor incisal edge

A

denar

50
Q

lower edge of the nostril

A

older hanau models

51
Q

when to use a face bow (3)

A

cusp teeth are present
interocclusal records are made at an increased occlusal vertical dimension
the occlusal vertical dimension is subject to change and alteration in occlusal surfaces are necessary

Occlusion (15 decks)

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