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30 Cards in this Set
- Front
- Back
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1. What is static occlusion?
What is dynamic occlusion? |
Contact of the maxillary teeth with the stationary mandibular teeth
Contact of the maxillary teeth w/ the moving mandibular teeth |
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2. What is angle class I occlusion?
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Maxillary mesiofacial cusp of first molar is located in the mesiobuccal developmental groove of the mandibular first molar
**What ortho strives to achieve **78% of US population |
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3. What is angle class II occlusion?
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Mandibular teeth are in a distal relationship compared to class I
Mesiofacial cusp lies in the facial embrasure between the mandibular first molar and second premolar **20% US population |
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4. What is angle class III occlusion?
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Mandibular teeth are in a mesial relationship compared to class I
Mesiofacial cusp of maxillary first molar fits into the distobuccal groove of mandibular first molar **2% of US population |
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5. What is maximum intercuspation (MI)?
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Position of the mandible when the teeth are brought into full static interdigitation w/ the maxilla and maximum number of teeth contacting
Habitual occlusion (naturally close mouth) |
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6. What else is MI known as?
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Intercuspal contact
IP Maximum closure, acquired closure, habitual closure, convenience closure |
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7. What are the two main rules of posterior static occlusion?
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1. Maxillary lingual occlusion line (Li-O) and the mandibular central fossa line (C-F) are coincident
2. Mandibular buccal occlusal line (B-O) and the maxillary C-F line are coincident |
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8. How are the mandibular teeth in comparison to the maxillary teeth?
What is a result of this? |
1/2 tooth lingual and 1/2 tooth mesial to the maxillary
Each mandibular tooth in MI contacts two maxillary teeth - its class counterpart and the tooth immediately mesial to it |
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9. What is vertical dimension of occlusion (VDO)?
What determines it? |
The distance between two selected points (one on the maxilla and one on the mandible) when the teeth are in MI
For example CEJ of max canine to CEJ of mand. canine Determined by the supporting cusps |
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10. What are supporting cusps?
Which cusps are supporting cusps? What do they do? |
Cusps that contact the opposing teeth along the C-F line
Buccal cusps of mandible and lingual cusps of maxilla Support the stop |
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11. What are five characteristics of all supporting cusps?
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1. Contact opposing tooth in MI
2. Support VDO 3. Nearer faciolingual center of tooth 4. Outer incline has potential for contact 5. Broader, more rounded cusp ridges (robust and better suited to crush food) |
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12. What are non-supporting cusps?
What are some other names for them? Which cusps are non-supporting cusps? |
Cusps that overlap the opposing teeth w/o contacting it
Gliding, guiding, or non-centric cusps Buccal cusps of maxilla and lingual cusps of mandible |
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13. What are five characteristics of all non-supporting cusps?
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1. Do not contact opposing teeth in MI
2. Do no support VDO 3. Farther from the faciolingual center of the tooth 4. Outer incline has no potential to contact 5. Cusps are generally sharper |
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14. What is the platform area?
What fits into platform areas? |
Diamond shaped, flat area formed by two adjacent marginal ridges in the same arch
Designed to cradle a supporting cusps |
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15. Which two supporting cusps are not cradled in platform areas?
Where are do they hit? |
Mesiolingual cusps of maxillary molars
Distobuccal cusps of mandibular molars In opposing central fossa for ML cusp and in distal fossa for DB cusp |
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16. What is a tooth-to-two tooth relationship?
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When the cusp hits the marginal ridge of each adjacent tooth
Tooth contacts both marginal ridges The most stable relationship |
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17. What is a tooth-to-one tooth relationship?
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Cusp to marginal ridge or cusp to fossa
Less stable relationship |
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18. In MI where are supporting cusps cradled?
Where are non-supporting cusps cradled? Where do mandibular anterior teeth hit? |
1. Marginal ridge platform area
-except ML cusps of upper molars and DB cusps of lower molars (central fossa so tooth-to-one tooth occlusion) 2. Facial/lingual embrasures or in developmental grooves of opposing tooth 3. Mandibular incisors and canines contact the respective lingual surfaces of their maxillary counterpart |
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19. What are the two types of incisor overlap?
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1. Horizontal overlap (overjet)
-distance between incisal edges horizontally 2. Vertical overlap (overbite) |
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20. What are the variations in incisor relationships?
How are incisor overlaps related to VDO? |
1. Open bite (mandibular deficiency)
2. Open bite (excessive eruption of posterior teeth 3. Cross bite (mandibular growth excess) Inverse relationship -patient's VDO is increased, the over bite and over jet is decreased |
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21. What is vertical dimension of rest (VDR)?
What is freeway space? |
The distance between two selected points (one on the maxilla and one on the mandible) when the mandible is at rest
The space between the maxillary and mandibular teeth at VDR (also known as interocclusal rest space) |
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22. What are the three determinants of occlusion?
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1. Teeth (determine VDO)
2. Musculature 3. Tempromandibular Joint |
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23. What are articulators?
What does the lower member mimic? What does the upper memebr mimic? |
Metallic instruments that are intended for reproduction of mandibular movements
Mandible and TMJ Base of skull |
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24. What is the Frankfort horizontal plane?
What is it used to determine? What do we usually use instead? |
Defined as the axio-oribital line
Base of skull Alla-traxis line |
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25. What is a facebrow?
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Accessory that comes w/ articulator that is utilized to relate the maxillary arch, according to its spatial relationship, to the base of the skull
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26. How are the elevator muscles in MI?
How is the mandible in MI? |
They contract when teeth are in full MI
Mandible is locked and can move to another occlusal contact position or free movement only if there is some relaxation of the elevator muscles |
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27. What forms the occlusal table?
What is the function of the occlusal table? |
Inner inclines of buccal and lingual cusps
Recipient of biting force Generally 50% to 60% of overall buccolingual dimension Positioned over the center of root support |
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28. When do the buccal cusps of upper arch and lingual cusps of lower arch have the potential for occlusal contact?
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When the mandible is performing horizontal glide (contact) movement
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29. What is the functional outer aspect (FOA)?
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Portion of supporting cusp that has the potential for making contact w/ the inner incline of the guiding cusps
Zone on the outer aspect of the supporting cusps |
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30. What is a central fossa designed to cradle?
When the mandible engages in horizontal glide movements, what does the labioincisal edge have potential to contact? During contact movements, what do anterior teeth prevent? |
A supporting cusp
Has potential to contact lingual inclines of maxillary anterior teeth Contact of posterior teeth |
