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Dental Anatomy > Anomalies > Flashcards

Flashcards in Anomalies Deck (21):
1

Microdontia

morphodifferentiation during bell stage

small/dwarfed

True - pituitary dwarfism (all teeth)
False - localized (Max lat -peg lateral and 3rds)

2

Macrodontia

morphodifferentiation during bell stage

Genetic

Teeth are large

True - pituitary gigantism (all)
False - localized (ant, mand 3rds)

3

Supernumerary

dental lamina and bud stages of initiation

mesiodens

Max 3rd molar region = distodens

4

Adontia

Disturbance in dental lamina and bud stages of initiation

True = rare, associated w/ ectodermal dysplasia; missing all or most teeth

Partial, hypodontia = congenitally missing; 1 or more missing; 3rds, Max lateral, mand 2nd PM

5

Gemination

Incomplete splitting of a single tooth germ with single root and pulp canal

Called twinning if the split is complete

6

Fusion

2 teeth united enamel and dentin, may involve pulp as well

Unknown etiology - heredity/possible trauma

Usually involves anterior teeth

Results in one less tooth

7

Concrescence

Union of teeth by cementum

Join when roots are in close proximity an excessive cementum deposition by one or both teeth

Happens after eruption

Involves permanent molars

8

Taurodontism

Increase of crown at root expense

Normal clinical/anatomical crown

Elongated body-enlarged pulp chamber w/o constriction of CEJ

Furcation and pulp chamber displaced apically = short root

Results in increased dimension between CEJ and furcation

Heredity

Affects PM and M

9

Dilaceration

Severe bend or distortion of a tooth root and/or crown

Displacement of partially formed tooth and continued development in original position

Etiology - traumatic injury

Results in distortion of crown and root from normal linear relationship

10

Dens in Dente

Tooth within a tooth

Enamel organ becomes invaginated

Normal enamel and Dentin become reversed and form inside the tooth (pulp cavity)

Permanent max lateral incisors

Defect or pit at lingual surface of tooth

11

Enamel pearl

Spherical nodule of enamel surrounding dentin attached to root surface of tooth

Usually found at furcation if tooth

Results from aberrant enamel deposition on root

Prevent normal CT and can cause perio problems

12

Odontoma

Growth of calcified dental tissues

Etiology- disturbance in dental lamina by trauma or infection

Compound odontoma- calcified tissues of a tooth resembling a tooth

Complex odontoma- mass of calcified dental tissues without definitive dental form

13

Hutchinsons incisors

Prenatal syphilis, treponema organism disturbs calcification of enamel during tooth formation

Unusual incisor shapes

Screwdriver shaped teeth, broad cervically, and narrowing incisally

Notched incisal edge

14

Mulberry molar

Posterior counterpart of hutchinsons incisors

Prenatal syphilis

Cusp of molar is more centrally located than normal molar

Enamel appears gnarled

15

Hypercementosis

Etiology- trauma, metabolic dysfunction or chronic inflammation of the pulp

Involves the roots of permanent molars

Occurs after eruption

16

Abnormal calcification

Occurs during histodifferentiation and appositional processes

Affects enamel and dentin formation

Etiology - heredity, systemic or local factors

17

Amelogenesis imperfecta

Heredity

Ranges from complete absence of enamel to enamel deposited, but not matured

Rampant caries

Excessive attrition

Esthetic concerns

18

Turners Teeth (enamel)

Etiology - trauma

Injury to developing tooth follicle by infection or extraction of deciduous tooth

Affects individual teeth

19

Fluorosis

Mottled enamel

Etiology- excessive high levels of fluoride ion during enamel calcification period

Chalky white bands become brown or yellow

Resistant to caries

Esthetic concerns

20

Dentinogenesis imperfecta

Heredity

Disturbance in dentin formation

Clinical appearance of opalescent crown which is bluish-brown in color

Obliterated pulp chamber

Enamel is normal but fractures easily due to lack of dentinal support

21

Tetracycline staining

Etiology- intake of tetracycline antibiotic either by mother or infant

Causes intrinsic color change to dentin of teeth undergoing mineralization

Affects teeth that were undergoing development during antibiotic therapy

Causes yellow or grayish cast on teeth affected