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28 Cards in this Set
- Front
- Back
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At what age is the third molar tooth germ visible on a radiograph?
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Age 9
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Cusp mineralization of a third molar is complete by what age?
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Age 11
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Crown formation of a third molar is complete by what age?
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Age 14
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50 % of the third molar roots have formed by what age?
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Age 16
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At what age are the third molar roots completely formed?
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Age 18
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By what age will 95% of all third molars that can erupt will have erupted?
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Age 24
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What are the bacteria most commonly associated with pericoronitis?
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Peptostretococcus, fusobacterium, bacteroides (porphyromonas)
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What is the most common reason for extraction of impacted third molars after the age of 20?
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Pericoronitis
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What percentage of impacted third molars are removed due to pericoronitis?
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25-30%
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What percentage of impacted third molars are removed due to caries in the second and third molars?
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15%
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What are the three major orthodontic considerations for removal of impacted third molars?
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1. Post-orthodontic incisal crowding (controversial)
2. Obstructing orthodontic movement 3. interfering with orthognathic surgery |
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T/F: It is reasonable to remove impacted third molars if the pt is experiencing unexplained pain in the same region?
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T
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What percentage of cases is the lingual nerve lying subperiosteally?
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25%
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What percentage of cases does the lingual nerve rise above the lingual crest?
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10%
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What is the incidence of post-operative complications from third molar removal?
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10%
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T/F: Ice has a moderate effect on post-operative edema.
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F
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What factor is the most important determinant of the amount of post-operative pain?
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Length of the procedure
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What is the incidence of post-operative infections after third molar removal?
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1.7-2.7%
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What percentage of post-operative infections are subperiosteal-abscess type, and when do they typically occur?
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a. 50%
b. 2-4 wks post-op |
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What is the incidence of dry-socket?
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About 20%
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By what percent can perioperative peridex reduce the incidence of dry-socket?
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50%
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What is the incidence of IAN and lingual nerve injury?
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3%
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What are common radiographic signs of IAN proximity to impacted third molars?
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a. narrowing of the canal
b. diversion of the path of the canal c. darkening of the roots d. interruption of the IAN cortex |
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If a maxillary tooth is displaced into the infratemporal fossa, how long should you wait for fibrosis to occur before attempting to retrieve it?
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2-4 wks
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When do late mandible fxs usually occur after mandibular third molar extractions?
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4-6 wks
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What is the situation when there is the greatest bony defect from mandibular third molar extraction?
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When there has been extensive amounts of bone resorbed around the second molar.
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When is periodontal pocketing less likely to occur after extraction of third molars?
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When there is no pocketing present prior to surgery.
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After what age should completely impacted, asymptomatic third molars be left undisturbed?
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Age 35
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