Introduction Articulators and Facebows Flashcards by sophie rosen

TYPES OF RESTORATIVE MATERIALS FOR TEETH (5)

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

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ceramics includes (3)

crowns
bridges (fixed partial dentures)
veneers

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CONCERNS ABOUT DENTAL AMALGAM AS RESTORATIVE MATERIAL (8)

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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CONCERNS ABOUT DENTAL AMALGAM AS RESTORATIVE MATERIAL (8)

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downside of dental amalgam restorations (2)

upside (1)

mercury
not aesthetically pleasing

repairs itself over time

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dental composite advantages (5)

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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dental composite disadvantages (6)

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

shape, color, contours

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oldest type of filling material available

gold foil/direct gold

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how long does gold last

can last the lifetime of the patient

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

pure gold

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average cost of metal in a cast gold crown

250 dollars

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cost of a full gold crown can be over

300 dollars

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why can aesthetics be a problem?

depends on your personal concept of aesthetics

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“How Long Will PFM Crowns Last?” (3)

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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tooth replacement options with implants (3)

complete dentures
partial dentures
fixed bridge and single teeth

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skipped:

High Strength Ceramics (6)

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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articulator

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

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uses of the articulator (4)

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

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components of the articulator (5)

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

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non adjustable or hinge articulators allow only — movements

opening and closing

non adjustable articulators can be usde for

single posterior restoration

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

closure angle

articulator used the most

semi-adjustable

semi adjustable articulators allow for (3) movements

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

Types of Semi-Adjustable Articulators: (2)

arcon | non arcon

arcon (2)

- Condyles in lower member | - Condylar inclination in the upper member

non arcon (2)

Condyles on upper member | Condylar inclination on the lower member

what type of articulator is our articulator?

arcon articulator

purpose of the facebow

orient the maxillary cast to the rotational axis in three planes

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

maxillary

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

opening axis of the articulator

usually the anatomic references are the (2)

mandibular condyles transverse horizontal axis and one other selected anterior point

kinematic locates the

true transverse horizontal axis of rotation

arbitrary locates the

axis by using anatomical landmarks

arbitrary utilizes --- --- to approximately locate the axis of rotation

average measurements

transverse horizontal axis (terminal hinge axis)

imaginary axis which passes through each of the mandibular condyles

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

pure rotational movement of the mandible

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

8 mm | tragus

Bergstrom point

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

Ear-bow

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

the facebow orients the maxillary cast to a

reference plane

the reference plane requires -- points

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

the anterior reference point is also known as the

3rd point of reference

the 3rd point of reference should be (2)

repeatable and reproducible

3rd point of reference (5)

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

orbitale

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

nasion

whip mix

maxillary incisor incisal edge

denar

lower edge of the nostril

older hanau models

when to use a face bow (3)

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