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124 Cards in this Set
- Front
- Back
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What is the least accurate inter-arch record for fixed prosthodontics?
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Record bases
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What is the most accurate inter-arch record for fixed prosthodontics?
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No record
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What is the purpose of interocclusal records?
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To provide vertical support and horizontal stability
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In which inter-arch record do you have the patient with a slightly open VDO?
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Bilateral, for CR
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What does a deprogrammer do?
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Eliminates the opportunity for posterior teeth to contact for a period of time
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What is another term for the bi-manual CR manipulation technique?
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Dawson technique
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What is the value of the Bennett angle on the Stratos?
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15 degrees
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What is the value of the condylar inclination on the Stratos?
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30 degrees
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Between what two bones is the articular disc?
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Temporal bone and mandible
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What is the posterior attachment of the articular disc?
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Retrodiscal pad/ bilaminar zone
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What is above the articular disc?
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Superior synovial cavity
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What is below the articular disc?
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Inferior synovial cavity
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What is the peripheral border of the synovial cavities?
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The capsule
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What covers the surface of the condylar processes and fossae?
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Avascular fibrous tissue
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What does ginglymoarthrodial mean?
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Joint is capable of both a hinging and gliding articulation
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What does the articular disc fuse with anteriorly?
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Capsule and superior lateral pterygoid muscle
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The first 15-20 mm of opening is what movement?
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Pure rotation/hinge
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What are the ligaments of the TMJ (3)?
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Temporomandibular, sphenomandibular, stylomandibular
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Where does the lateral pterygoid muscle insert?
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Lateral surface of the TMJ joint capsule, the articular disc, and the neck of the mandible
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What is the only muscle of mastication that serves to reinforce the TMJ?
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Lateral pterygoid muscle
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Where does the first 15-18 mm of opening take place?
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Lower joint compartment
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Along what axis is hinge movement?
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Horizontal axis
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What movement takes place during the second stage of opening?
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Translation
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Where does translation take place?
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Upper joint compartment
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Where does the second stage of opening take place?
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Upper joint compartment
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Where does hinge motion take place?
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Lower joint compartment
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What prevents anterior over-rotation?
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Posterior ligament
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What binds the disc to the temporal bone?
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Superior elastic stratum
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What supplies anterior force against the disc?
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Superior belly of the lateral pterygoid muscle?
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When is the disc in the most superior-anterior position?
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At the start of opening
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When does the posterior ligament become lax?
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At maximum opening
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When is the superior head of the lateral pterygoid active (opening or closing)?
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Closing
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When is the inferior head of the lateral pterygoid active (opening or closing)?
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Opening
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When is the temporomandibular ligament lax?
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At CR
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What is subluxation?
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When the condylar process and disc has slid too far forward, beyond the articular tubercle
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What are the origins of the lateral pterygoid muscle?
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Superior head: Greater sphenoid wing
Inferior head: Outer surface of lateral pterygoid plate |
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Which lateral pterygoid head is active during jaw protrusion?
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Inferior
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Which head of the lateral pterygoid is responsible for retro-orbital pain?
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Inferior
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What muscle stabilizes the condylar head and disc against the articular eminence during mandibular closing?
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Superior head of the lateral pterygoid
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What innervates the lateral pterygoid?
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CN V
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What muscle extends from the zygomatic arch to the ramus of the mandible?
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Masseter
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When is the masseter active (opening/closing)?
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Closing (forceful)
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What muscle originates from the medial surface of the lateral pterygoid plate?
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Medial pterygoid muscle
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What muscle is involved with forceful seating of the condylar head?
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Medial pterygoid muscle
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When is the medial pterygoid muscle active?
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During protrusion
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Where does the temporalis muscle originate?
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Temporal fossa
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What muscle is the principle positioner of the mandible during elevation?
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Temporal part of the temporalis muscle
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What part of the temporalis muscle is active in retruding the mandible?
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Posterior part
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What part of the temporalis is active in clenching?
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Anterior part
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What part of the temporalis is associated with muscle contraction headaches?
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Anterior part
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What part of the temporalis is involved in scalp and hair tenderness?
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Posterior part
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Where is the attachment of the anterior digastric?
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At or near the lower border of the mandible near the midline
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What covers the anterior part of the digastric muscle?
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Platysma
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What is the range for the angle of the arc in pure hinge movement?
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10-13 degrees
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What are the synonyms for the non-working side?
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Orbiting; mediotrusive
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What are the synonyms for the working side?
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Rotating; laterotrusive
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What is Lundeen & Wirth's range for immediate lateral translation?
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0-3 mm
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What is Hobo & Mochizuki's range for immediate lateral translation?
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0-2.6 mm
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Which researchers view immediate lateral translation as only in laterotrusion?
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Hobo & Mochizuki
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What are synonyms for Bennett angle?
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Progressive side shift; progressive lateral translation
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What is the definition of the Bennett angle?
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The angle of the mediotrusive path of the nonworking condyle in the horizontal plane
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What is the range of Bennett angle for Lundeen & Wirth?
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6-8 degrees
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What is the range of Bennett angle for Hobo & Mochizuki?
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1.5-36 degrees
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What is condylar guidance determined by?
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The slope of the articular eminence
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What is the radius of the condylar path?
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19 mm
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What is the average intercondylar distance value?
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110 mm
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Where is the condyle on an arcon articulator?
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Lower member
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Where is the condyle on a non-arcon articulator?
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Upper member
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What are the 6 pathologic conditions of occlusion?
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Bruxism, clenching, abfractions, primary occlusal trauma, secondary occlusal trauma, temporomandibular dysfunction
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What is the term for excursive grinding?
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Bruxism
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What is the term for centric grinding?
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Clenching
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What is secondary occlusal trauma?
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Normal forces on a periodontally compromised tooth
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What is the natural wear rate for enamel in a year?
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30 microns; 0.3 mm in 10 years
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Which teeth accept and transmit vertical forces?
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Posteriors
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Which teeth accept and transmit horizontal forces?
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Anteriors
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Which teeth provide a vertical stop during guidance?
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Posteriors
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Which teeth are designed to accept a vertical load?
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Posteriors
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Which teeth can handle lateral excursive forces?
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Canines
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Why do anteriors separate posteriors during protrusion?
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To prevent fracture of posteriors
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Why do we not have control over the posterior determinants of occlusion?
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Because of the TMJ
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What is the range of the protrusive incisal path from the horizontal reference plane?
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50-70 degrees
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In a healthy occlusion, how much steeper is the anterior guidance than the condylar path?
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5-10 degrees
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Which inclines do you correct by elimination?
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MUDL, BULL
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Which incline is caused by a forward and vertical slide?
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MUDL
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Which inclines are caused by a lateral and vertical slide
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LUBL, BULL
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Which incline identifies protrusive interferences?
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DUML
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Which incline identifies a working incline?
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LUBL
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Which incline identifies a balancing/non-working incline?
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BULL
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Which inclines indicate a CR/MI interference?
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MUDL, LUBL, BULL
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Which class is the most effective lever system?
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Class I
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Which class is the most destructive lever system?
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Class I
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Which class is the least effective lever system?
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Class III
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What kind of lever system is the temporomandibular joint?
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Class III
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What kind of lever system is an occlusal interference?
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Class I
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What is Christensen's phenomenon?
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The steeper the articular eminence, the more separation between teeth
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What are border movements a compilation of?
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The most extreme positions that a mandible can handle
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What is position 1 in Posselt's envelope?
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Rest
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What is position 2 in Posselt's envelope?
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Maximum intercuspation
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What is position 3 in Posselt's envelope?
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Initial tooth contact in CR
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What two positions in Posselt's envelope are equal when CR=MI?
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2 and 3
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What is position 4 in Posselt's envelope?
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Maximum pure hinge position
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What is position 5 in Posselt's envelope?
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Maximum open
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What is position 6 in Posselt's envelope?
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Maximum protrusion
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What is position 10 in Posselt's envelope?
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Functional envelope
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If a patient has myofacial pain, do you mount in CR or MI?
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MI
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If a patient has no signs of instability, do you mount in CR or MI?
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MI
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If a patient has signs of instability, do you mount in CR or MI?
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CR
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If you are to restore a significant portion of a patient's dentition, do you mount in CR or MI?
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CR
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If you are to restore a patient's anteriors, do you mount in CR or MI?
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CR
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If there is a premature protrusive contact, what type of contact is most likely responsible (DUML, MUDL, BULL, LUBL)?
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DUML
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If there is a premature CR/CO contact, what type of contact is most likely responsible (DUML, MUDL, BULL, LUBL)?
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MUDL
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What type of marking media marks the best in a moist field?
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Wax
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What type of marking media leaves extra marks when used?
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Thin articulating paper
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What type of marking media makes broad marks?
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Thick articulating paper
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How thick is the carbon on plastic marking medium?
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21 microns
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What kind of mark does carbon on plastic leave in a moist field (poor, fair, good, excellent)?
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Good
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What kind of mark does thin articulating paper leave in a moist field (poor, fair, good, excellent)?
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Fair
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What kind of mark does thick articulating paper leave in a moist field (poor, fair, good, excellent)?
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Poor
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How thick are foil marking media?
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8-12 microns
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What type of marking media is used as a final check of occlusal contact intensity?
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Foils
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What type of marking media is used for contact between clips and implant bars?
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Sprays
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How thick are liquid marking media after evaporation?
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3 microns
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What is the thickness of thick articulating paper?
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100-250 microns
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What is the thickness of thin articulating paper?
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40-80 microns
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