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50 Cards in this Set
- Front
- Back
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What are the two main causes of dental anomalies?
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genetics
developmental/metabolic disturbances |
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Which teeth are more likely to exhibit anomalies?
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maxillary more than mand.
permanent more than primary |
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What is the difference between edentulous and anodontia?
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anodontia: the teeth never formed
edentulous: the teeth formed, but aren't present |
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A child never formed deciduous teeth, but his permanent teeth came in normally. What anomaly is this considered?
a. hypodontia b. total anodontia c. dilaceration d. partial anodontia |
b. total anodontia
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What is the cause of anodontia?
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abnormal development of the ectoderm or outer embryonic cell layer
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What's the most common congenitally absent tooth and what percent of the population exhibits it?
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3rd molars
35% |
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What's the second most common congenitally absent tooth and what percent of the population exhibits it?
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max. permanent lateral incisors
1-2% |
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What's the third most common congenitally absent tooth and what percent of the population exhibits it?
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max. permanent 2nd molars
1% |
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Give the percent of people that exhibit supernumerary teeth. Also, give the percent of supernumerary teeth found in the maxilla.
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.3-3.8
90% in max. |
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What's the most common type of supernumerary teeth?
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mesiodens
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How prevalent are mesiodens in Caucasians in permanent and primary dentitions?
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.15-1.9% in permanent
~0.5% in primary |
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What are the 4 names for supernumerary teeth that grow distally to the third molars?
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4th molars
paramolars distodens distomolars |
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Where is the most common place for supernumerary teeth to occur in the mandible?
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between the first and second premolars
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What are the most variable teeth in the mouth?
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max. 3rd molars
followed by mand. 3rds |
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What percent of the population exhibits peg laterals?
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1-2%
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How many root systems does a germinated tooth have?
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one
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What are the most commonly germinated teeth?
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max anteriors
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What usually doesn't fuse when two teeth fuse?
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roots and pulp chambers
(dentin always fuses) |
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What causes Hutchinson's Incisors and Mulberry Molars?
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congenital syphilis
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What are the characteristics of Hutchinson's Incisors?
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broad cervically
narrow incisally notched incisal edges |
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What causes accessory cusps, tubercles or ridges?
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hyperplasia
fusion of a supernumerary tooth due to crowding |
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What is tuberculum intermedium?
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a third (middle) lingual cusp on mand. molars
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What is another name for talon cusp?
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dens evaginatus
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Where do enamel pearls usually form?
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furcation area of molars
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What are the characteristics of taurodontia?
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no constriction of the CEJ
large pulp chamber |
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What is taurodontia caused by and what's another name for it?
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disorganization of calcified tissue
heavy use bull teeth prism teeth |
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What is dilaceration?
a. tooth with in a tooth b. two extra grooves in a molar c. extra cusp on lingual surface of incisor d. curved root |
d. a severe bend or angular distortion of a root
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What tooth most commonly exhibits dens in dente and dens invaginatus?
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max. lateral
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What is Concrescence?
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fused roots of adjacent teeth
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What is hypercementosis?
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excessive cementum around root after eruption
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What causes hypercementosis?
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trauma
grinding metabolic dysfunction periapical inflammation |
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What are the anterior teeth that are most likely to experience accessory roots?
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mand. canines
mand. premolars |
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What's the difference between unerupted teeth and impacted teeth?
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unerupted teeth are stuck because they are lazy
impacted teeth are stuck because something gets in their way |
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What is the most common tooth to experience transposition?
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max. canine
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What is the most common tooth to experience rotation?
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max. 2nd premolar
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What causes ankylosis?
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trauma
infection reimplantation with faulty splint |
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What's the difference between dysplasia and hypoplasia?
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dysplasia: abnormal development
hypoplasia: incomplete development |
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What causes amelogenesis imperfecta?
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genetics
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What characterizes dentinogenesis imperfecta?
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partial or total loss of pulp chambers in both dentitions
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What is Fremitis and how do you measure it?
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functional mobility of teeth
lay finger across teeth and feel their vibrations and jiggles as patient bites down |
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What four things does dental mobility depend on?
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height of bone
width of PDL space shape of roots number of roots |
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What does a periodontometer do?
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Measures how far the tooth can rotate
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What is primary occlusal traumatism?
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malocclusion causes pressure and tension in PDL
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Which of the following are completely reversible?
a. dens invaginitis b. tetracycline staining c. primary occlusal traumatism d. secondary occlusal traumatism |
c. primary occlusal traumatism
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What does ICT stand for?
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infiltrated of infected connective tissue
(seen in primary occlusal traumatism) |
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What are the symptoms of primary occlusal traumatism?
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tooth mobility
sensitive to pressure migration of teeth widened PDL boney defects |
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What are the trends to PDL width?
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thinner at the midroot
thinner when tooth is not as functional |
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What are the 4 defining characteristics of secondary occlusal traumatism?
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Abnormal or Normal forces on a diseased periodontium
Apical migration of junctional epithelium Loss of gingival connective tissue Rapid bone loss and pocket formation |
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What can bridges do to effect secondary occlusal traumatism?
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improve the trauma only while bridge is in place.
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How should the opposing forces of an implant be distributed?
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grouped near the center.
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