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65 Cards in this Set
- Front
- Back
What teeth should ideally provide guidance through full range of movement in lateral mandibular excursions?
What is this called? |
Canines
Canine or cuspid protected occlusion |
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What are the characteristics of canine protected occlusion?
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Vertical overlap of Max & Mand canines produces separation of all posterior teeth
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Occlusion relationship in which there is contact of all teeth on the working side during lateral working movement
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Unilateral balanced occlusion
Group function |
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What relationships are not conducive to cuspid protected occlusion?
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Class II or end to end relationship
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What relationships are not amenable to group function?
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Class II, Deep overlap
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Why is it essential to have no non-working side contacts?
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1. They are damaging
2. They are difficult to control due to Mand. flexure 3. They deliver more force to the teeth than other contacts |
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In an ideal intercuspal position, the mesiobuccal cusp of the permanent max. second molar opposes what?
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The buccal groove of the Mand. second molar
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What is the key factor in a class I relationship?
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Mesiobuccal cusp of Max. first molar opposing mesiobuccal groove of Mand. first molar
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What does the distobuccal cusp of the max. first molar oppose?
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The distobuccal groove of Mand. first molar
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What does the distobuccal groove serve as an escapeway for?
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ML cusp of Max. first molar during non-working excursive movements
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When the Mand. moves right the ML cusp of the Max. Rt. first molar passes through where?
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Lingual groove of Mand. Rt. first molar
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What does the oblique ridge of the Max. first molar oppose?
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Developmental groove between the distobuccal and distal cusps of the Mand. first molar
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What are the guiding cusps of the teeth?
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Max. Buccal cusps
Mand. Lingual cusps |
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Maxillary arch is positioned mesially, with the mesiobuccal cusp above the embrasure between the Mand. 1st molar and second premolar.max. Canine seated anterior to Mand. Canine.
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Class II relationship
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What is the difference between a class II division II vs. a class II division I?
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Class II Division II = Incisors more upright, less overjet, deeper overbite
Class II Division I = Incisors less upright, more overjet, shallow overbite |
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Mandibular first molar is mesial to max. first molar. Mandibular arch is displaced mesially or the max arch is displaced distally, with mesiobuccal cusp of the max. first molar occluding distal to the buccal groove of the mand. first molar
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Class III relationship
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Mandibular first permanent molar is slightly anterior to the max. first permanent molar. Mesiobuccal cusp of Max. first molar is placed over the buccal groove of the mand. first molar.
Inaddition the max. canine is placed between the mand. canine and the mand. first premolar |
Class I occlusion
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What is it called if the mand. first molar is slightly anterior to the max. first molar but with other irregularities present elsewhere?
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Class I malocclusion
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Max. arch is positioned mesially, with the mesiobuccal cusp above or approaching the embrasure between the mand. first molar and the second premolar. The max. canine is also seated anterior to the mand. canine. Incisors normally display excessive anterior overjet.
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Class II Division I occlusion
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Broader, rounded cusps are an indication of what type of cusp?
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Supporting and working
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What are the five common characteristics of supporting cusps?
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1. Contact opposing tooth in ICP
2. Support vertical dimension 3. Nearer faciolingual center than non 4. outer incline has potential for contact 5. Broader, rounded cusps |
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What are the supporting cusps?
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Max. lingual and Mand. buccal cusps.
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These cusps do grinding work because they occlude in a fossa or marginal ridge. Also sometimes called _____ _____ because they hold the occlusion in a middle position.
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Supporting/Working Cusps
Centric Cusps |
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What are the non-supporting cusps?
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Max. buccal and mand. lingual cusps
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These cusps do not occlude or fit into fossae of marginal ridge areas. These cusps allow the dentition to move apart, out of occlusion. They allow the teeth to unlock and move back and forth and side to side
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non-supporting, balancing or non-centric cusps
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Under ideal conditions what two teeth only occlude with one other tooth from the opposing dentition?
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Mand. Central incisors and Max. Third Molars
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In an ideal ICP, the facial cusp tip of the permanent Max. second premolar opposes the...
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Facial embrasure between the Mand. second premolar and the Mand. first molar
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The facial cusp tip of a max. first premolar opposes the ...
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Facial embrasure between the mand. first and second premolars
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During a lateral excursive movement, the facial cusp ridge of the max. first premolar on the working side opposes what?
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Distal cusp ridge of the first premolar and the mesial cusp ridge of the second premolar
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In the intercuspal position, where does the distolingual cusp of a permanent max first molar occlude?
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The interproximal ridge areas between the mand. first and second molars.
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Where does the lingual cusp of the max. first premolar occlude?
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Distal triangular fossa of first premolar
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Where does the lingual cusp of the max. second premolar occlude?
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Distal triangular fossa of the second premolar
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Where does the mesiolingual cusp of the max. first molar occlude?
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Central fossa of first molar
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Where does the mesiolingual cusp of the max. second molar occlude?
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Central fossa of second molar
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Where does the distolingual cusp of the max. second molar occlude?
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Distal marginal ridge of the second molar and mesial marginal ridge of the third molar
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In the interproximal position, where does the distobuccal cusp of a permanent mand. first molar occlude?
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Cental fossa of max. first molar
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In ICP where does the buccal cusp of the Mand. first premolar occlude?
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Mesial triangular fossa of first premolar and distal marginal ridge of canine of Max.
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In ICP where does the buccal cusp of the Mand. second premolar occlude?
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Mesial triangular fossa of the second premolar of Max.
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In ICP where does the mesiobuccal cusp of the Mand. first molar occlude?
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Mesial marginal ridge of first molar and distal marginal ridge of second premolar (max.)
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In Icp where does the distal cusp of the Mand. first molar occlude?
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Distal fossa of first molar (max.)
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In ICP where does the mesiobuccal cusp of Mand. second molar occlude?
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Mesial marginal ridge of second molar and distal marginal ridge of first molar (max.)
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In ICP where does the distobuccal cusp of the mand. second molar occlude?
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Central fossa of second molar (max.)
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Which cusp of the permanent max. first molar serves as a reference point in identifying Class I, II, III occlusion?
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Mesiobuccal cusp
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What is the most common classification of occlusion?
What is the percentage? |
Class I 70%
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Mesiobuccal cusp of Max. first molar lines up approximately with the mesiobuccal groove of the mand. first molar. Max. centrals overlap mand. centrals. Max. Canine lies between the mand. canine and first premolar
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Class I occlusion
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What is the less common classification of occlusion and what is its percentage?
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Class II Occlusion 25%
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Mesiobuccal cusp of max first molars fall appox. between the mand. first and second premolar. Lower jaw and chin may also appear small and withdrawn. Mand. incisors occlude even more post. to max. incisors so they don't touch at all. Max. canine is mesial to mand. canine.
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Class II Occlusion
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What are the subclassifications of class II occlusions based on?
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Position of the incisors
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What is the least common classification of occlusion and its percentage?
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Class III occlusion less than 5%
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Mesiobuccal cusp of max. first molar falls approx. between mand. first molar and second molar. Chin may also protrude like a bulldog's does. Mand. Incisor overlaps anterior max. incisors. Max. Canine is distal to mand. canine.
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Class III occlusion
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What cusps are considered to be the guiding cusps?
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Max. buccal cusps
Mand. lingual cusps |
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What are some other names for guiding cusps?
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Balancing
non-supporting non-centric shearing |
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These cusps do not occlude or fit into fossae or marginal ridge areas on the opposite arch. They allow the dentition to move apart, out of occlusion. Allow the teeth to unlock and move back and forth and side to side
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Non-supporting cusps
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What are considered the supporting cusps of the dentition?
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Max. Lingual and Mand. facial cusps
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What are some other names of supporting cusps?
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Working, Stamp, Centric cusps.
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Areas of contact that a supporting cusp makes with opposing teeth
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Centric Stops
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Where do supporting cusps contact?
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Opposing teeth in their corresponding faciolingual centeron a marginal ridge or fossa.
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_____ overlap the opposing tooth without contacting it.
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Non-supporting cusps
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In _____ _____-_____ situations the supporting and guiding cusps are opposite.
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Posterior cross-bite
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What does the mand. first molars mesiolingual cusp oppose?
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Lingual embrasure of Max. first and second molars
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What does the mesiolingual cusp of mand. first molar oppose?
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Lingual embrasure of Ma. second and third molar
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What does the distolingual cusp of the mand. first molar oppose?
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Fits into the lingual groove of max. first molar
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What does the lingual cusp of permanent mand. first molars occlude with?
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Nothing
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Assuming normal occlusal relationships what surfaces of mand. molars are contacted by their antagonists in mand. movements?
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All areas of buccal and lingual cusps of the mand. except the outer aspect of the lingual cusp.
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In what type of occlusion will contact between mand. buccal cusps and max. buccal cusps, along with simultaneous contact between mand. lingual cusps and max. lingual cusps occur in laterotrusive movements?
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Unilateral balanced occlusion
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