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17 Cards in this Set
- Front
- Back
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1. What is protrusive glide?
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Mandible is propelled straight forward until the upper and lower incisors contact edge-to-edge
Bilaterally symmetrical (both sides of mandible move in the same direction) |
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2. On the working side in lateral mandibular movement what can happen to the supporting cusps?
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Have the potentiality of sliding over the inner aspects of the guiding inclines so that the cusp tips pass between the opposing cusp tips
Engage in group function |
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3. What is angle of the path that the supporting cusps follow in protrusive mandibular glide?
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Diagonal path across the inner aspect of the opposing guiding incline
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4. Where does rotational movement occur?
In what direction does the TMJ allow free movement of the condyles? What direction is it restricted? |
Between the inferior surface of the disks and condyles
Anterior-posterior direction Resist lateral displacement |
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5. What is centric relation?
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The position of the mandible when the condyles are positioned superiorly in the fossae in healthy TMJ
Independent of tooth contacts Describe as the most retruded position of the mandible from which lateral movements can be made |
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6. What does left lateral motion result from?
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Forward translation of the right condyle (non-working side condyle) and rotation of the left condyle (working side condyle)
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7. What is TH (terminal hinge)?
What is CO (contact occlusion)? What is the posterior border? What is the area of most interest to dentists? |
Rotation when the condyles are in CR
The first tooth contact as the mandible closes in TH The maximum retruded opening path The superior border produced by tooth contact |
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8. In a left lateral movement, how do the mandibular teeth mooth?
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Left mandibular teeth move away from mid-line (working or laterotrusion)
Right mandibular teeth move towards mid-line (non-working or mediotrustion) |
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9. What does the gliding tooth contact supplied by canine guidance provide?
Two things... |
1. Separation of the posterior teeth during lateral jaw movement
2. Prevents potentially damaging collisions of their cusps |
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10. What does the Bennett shift (lateral shift) measure?
Excessive lateral condylar shifting coupled w/ what poses a significant problem? What guidance is primarily responsible for the working side? What about for the non-working side? |
Looseness of the TMJ
Shallow canine guidance Canine guidance Articular eminence has dominant influence |
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11. Damage to the TMJ due to arthritis or rearrangements increases what?
What characterizes chewing movements? |
Looseness of the joints (also changes the relationship of CO to MI)
Wide lateral movements of the mandible to the working side |
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12. What is the posterior guidance in articulator?
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1. Horizontal condylar guidance setting approximates the slope of the aritcular eminence
2. Medial-wall setting approximates the lateral shift |
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13. What determines the amount of vertical separation of posterior teeth on both sides as the mandible leaves or enters MI during lateral movements?
Increasing horizontal condylar guidance increases what else? |
Horizontal guidance of the non-working condyle couple w/ working side canine guidance
The steepness of the mandibular molar movement in protrusion |
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14. When does the loss of anterior guidance have the greatest effect?
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When the horizontal condylar guidance is shallow (20 degrees)
Has the least effect when horizontal guidance is steep (50 degrees) |
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15. What is the axis-orbital plane used for?
How is the mandibular cast mounted on an articulator? |
Used as a reference point for mounting the maxillary cast by facebrow mounting
Mounted w/ respect to the upper arch by use of bite records -produces lower values for the lateral shift |
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16. During protrusion what is not desirable?
What is disocclusion or disclusion? When should posterior teeth contact? |
Posterior tooth contact
Separation of the posterior teeth as the mandible moves anteriorly Only in MI |
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17. Which type of patients are the most difficult to restore w/o introducing undesirable tooth chewing?
What is group function? When can group function be a therapeutic goal? |
Shallow anterior guidance or open bite
Multiple tooth contacts during lateral jaw movements Bony support of canine is compromised or class II occlusions in which canine guidance is impossible |
