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76 Cards in this Set
- Front
- Back
Dental anomalies
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deviation from normal
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without teeth
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Anodontia
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Types of Anodontia
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- total anodontia
- partial anodontia |
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congenital absence of all teeth
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total anodontia
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some congenitally missing teeth
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partial anodontia
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most commonly missing permanent dentition
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Third Molars (Maxillary > Mandibular)
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second most commonly missing teeth
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Maxillary Lateral Incisor
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third most commonly missing teeth
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Mandibular 2nd Premolar
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teeth that form in excess of the normal dental formulas for each quadrant
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supernumerary teeth
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small supernumerary tooth between central incisors
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mesiodens
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supernumerary tooth distal to third molar
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distomolar (4th molar) (paramolars)
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most common location in mandible for supernumerary tooth
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mandibular 2nd premolar
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distomolar happens more often in __________ than _________
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- maxillary
- mandibular |
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distomolars _______ erupt into oral cavity
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rarely
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most common anomaly in tooth shape in anterior region of permanent dentition
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peg lateral incisor
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Peg laterals most commonly happen in the
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maxillary
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results from splitting of single forming tooth
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Gemination (Twinning)
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Gemination has ____ root(s) but appears as ___ crown (s)
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- 1
- 2 |
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Most common area for Gemination
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maxillary central and lateral incisor region
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Gemination is the opposite of
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fusion
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Fusion is
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two roots fusing into one crown
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Fusion is the union of ___ adjacent tooth germs, and always involves ______
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- 2
- dentin |
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An unusual incisor and molar shape may occur in both dentitions as a result of syphilis
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Hutchinson's teeth
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Maxillary and Mandibular incisors may be screwdriver shaped, broad cervically and narrowing incisally with a notched incisal edge and may be referred to as
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Hutchinson's incisors
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Molars with multiple tiny tubercles with poorly developed indistinguishable cusps are known as
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mulberry molars
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extra small enamel projections or extra accessory cusp
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tubercles
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a third lingual cusp that may develop on a mandibular molar on the lingual surface
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Tuberculum intermedium
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is what the extra cusp is called if it is located on the distal marginal ridge
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Tuberculum sextum
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small, rounded nodules of enamel with tiny core of dentin
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enamel pearl
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Radiographically enamel pearls appear as
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small round radiocapacities
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Enamel pearls are mostly found
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in distal of third molars and the buccal root furcation of molars
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"Bull" or "prism" teeth
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Taurodontia
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________ has a long pulp chamber without constriction at CEJ
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Taurodontia
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Taurodontia only occurs on
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permanent teeth
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appears like the "claw of an animal"
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Talon Cusp
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small enamel projection in cingulum area of Maxillary or Mandibular anterior permanent tooth
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Talon Cusp
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Talon cusp is often mistaken for superimposed supernumerary tooth over an anterior tooth or dens en dente because
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it has pulp horns in cusp
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very small but normally shaped tooth
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Microdontia
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very large but normally shaped tooth
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Macrodontia
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Severe bend or distortion of tooth root and/or crown, often approximating 45-90 degree angle
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Dilaceration
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means tooth within a tooth
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Dens En Dente
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Developmental anomaly resulting from invagination of enamel organ within crown of rooth
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Dens En Dente
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Dens En Dente is most commonly in
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Maxillary Lateral Incisor
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Dens En Dente can be confused with _________ on radiograph
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Talan cusp
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Superficial fusion of two adjacent teeth at root through cementum only
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Concresence
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Normal sized crowns with short roots, associated with orthodontics
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Dwarfed roots
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Excessive formation of cementum around root of a tooth after tooth has erupted
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Hypercementosis
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Hypercementosis can be due to
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- trauma
- metabolic dysfunction - periapical inflammation |
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Extra Roots
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Accessory Roots
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Accessory Roots most often occur in
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third molars, canines and premolars
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Fail to erupts due to mechanical obstruction
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Impacted teeth
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Failure to erupt is due to
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man's decreasing jaw size
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tooth in different position where it is supposed to be
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Transposition
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Transposition is most common in
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canines (Maxillary > Mandibular)
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tooth rotation is most common on
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- maxillary 2nd premolar
- maxillary incisor, 1st premolar - mandibular 2nd premolar |
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teeth that erupt into oral cavity but fail to reach occlusion with opposing arch
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ankylosis
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Ankylosis is initiated by
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infection or trauma to PDL
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The ankylosed tooth has lost its periodontal ligament space and is truly ______ to the alveolar process or bone
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fused
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Imperfect enamel formation
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Amelogenesis Imperfecta
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hereditary disorder that affects enamel formation of both dentitions
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Amelogenesis Imperfecta
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Amelogenesis Imperfecta can be a complete or partia lack of
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enamel
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Cause during enamel formation by ingestion of high concentration of fluoride in water
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Fluorosis
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The fluorine content of some naturally occuring mineral water that causes this condition is many times greater than
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one part per million
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Fluorosis is characterized by
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- molted enamel - yellow/white spots
- severe pitted enamel |
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high fever can cause _______ damage
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enamel
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pitted enamel is often the result of early childhood fever from such diseases as
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measles
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Dentin forming imperfections
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Dentinogenesis Imperfecta
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Hereditary disorder that affects dentin formation of both dentitions
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Dentinogenesis Imperfecta
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Dentinogenesis Imperfecta is characterized by
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- light, blue-gray to yellow teeth that appear opalescent
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Radiographically, deninogenesis imperfecta demonstrates a
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partial or total absence of pulp chambers and root canals
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Tetracycline taken by pregant women, infant, child during tooth formation and calcification causes
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Tetracycline Stains
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Wearing away of dentin by bruxism, which is excessive grinding or gritting
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Attrition
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Wearing away of tooth structure by mechanical means, usually improper brushing
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Abrasion
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Similar to abrasion but due to tooth flexure (bending) from heavy occlusal forces
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Abfraction
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Loss of tooth structure due to chemical means and affects smooth and occlusal forces
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Erosion
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Erosion can be caused by
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lemons, soft drinks, regurgitated stomach acids, idiopathic causes
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