NBDE Part I Exam Questions With All
Correct Answers
Dilaceration - Answers-A severe angulation or curve in the root AND crown of a tooth
that is thought to result from trauma during development
.Hutchinson's Incisors (Syphilitic Hypoplasia) - Answers-When an incisor is congenitally
missing the middle lobe due to a prenatal syphilis infection.
.Mulberry Molars (Syphilitic Hypoplasia) - Answers-Constriction of the occlusal table and
disorganized surface anatomy due to syphilitic infection during development.
.Turner's Tooth (Turner's Hypoplasia) - Answers-Where a permanent tooth erupts into
the mouth with a hypocalcification spot due to insult from an abscessed or traumatized
primary tooth.
Since it's hypo calcification, that means it is in a higher caries risk.
.Anodontia/hypodontia/
oligiodontia/hyperdontia; basically anything with
-dontia is - Answers-a GENETIC etiology during the LAMINA stage
.Hyperdontia - Answers-Extra (supernumerary) teeth.
.Hypodontia - Answers-Too few teeth. Most commonly 3rd molars, 2nd premolars and
Mx laterals.
.(Total) Anodontia - Answers-all teeth congenitally missing. Has a genetic etiology.
.Partial Anodontia - Answers-One or a few missing teeth
Result of hereditary factors that preclude the initiation of the tooth buds
Most commonly missing teeth: 3rd molars, maxillary lateral incisors, mandibular 2nd
premolars
Least common missing teeth: canines
.Oligiodontia - Answers-6 or more congenitally missing teeth, excluding the 3rd molars
.abnormal tooth size - Answers-Caused by a distance during the bell stage of
morphodifferentiation
, Most commonly has a genetic etiology (all with
-dontia, has genetic etiology)
.True Macrodontia - Answers-ALL teeth are enlarged
.False Macrodontia - Answers-1 or a few teeth too large
Most commonly seen in canines, incisors, and mandibular 3rd molars
.True Microdontia - Answers-ALL teeth are abnormally small. Rare disorder. Seen in
cases of growth hormone deficient dwarfism.
.False Microdontia - Answers-♣ Most common tooth size abnormality
♣ Individual teeth appearing smaller than normal
♣ Most commonly affects maxillary lateral incisors (Peg lateral) and maxillary 3rd molars
.Microdontia - Answers-Teeth too small. Most commonly a peg lateral incisor. False
Microdontia - Most affects permanent maxillary laterals (peg laterals).
.Dental Fluorosis - Answers-Mottled enamel
Hypomaturation of the enamel due to excess ingestion of fluoride during enamel
formation.
Forms caries resistant teeth.
.Attrition - Answers-Wearing away of tooth structure by grinding or clenching. Causes
loss of vertical dimension.
.Abrasion - Answers-Wearing away of tooth structure by an object. (toothbrush, floss,
bobby pins)
.Tooth Erosion - Answers-Wearing away of tooth structure by chemical dissolution.
(Dietary acid or gastric acid)
.Abfraction - Answers-Wearing away of tooth structure near the CEJ by flexural forces
exerted during heavy occlusion. Resembles toothbrush abrasion.
.Impaction - Answers-Teeth fail to erupt.
.Ankylosis - Answers-Where bone fuses to the cementum and dentin of a tooth.
Prevents exfoliation of primary teeth and eruption of underlying permanent tooth.
.Supernumerary teeth - Answers-an excessive number of teeth that has a normal
morphology
Correct Answers
Dilaceration - Answers-A severe angulation or curve in the root AND crown of a tooth
that is thought to result from trauma during development
.Hutchinson's Incisors (Syphilitic Hypoplasia) - Answers-When an incisor is congenitally
missing the middle lobe due to a prenatal syphilis infection.
.Mulberry Molars (Syphilitic Hypoplasia) - Answers-Constriction of the occlusal table and
disorganized surface anatomy due to syphilitic infection during development.
.Turner's Tooth (Turner's Hypoplasia) - Answers-Where a permanent tooth erupts into
the mouth with a hypocalcification spot due to insult from an abscessed or traumatized
primary tooth.
Since it's hypo calcification, that means it is in a higher caries risk.
.Anodontia/hypodontia/
oligiodontia/hyperdontia; basically anything with
-dontia is - Answers-a GENETIC etiology during the LAMINA stage
.Hyperdontia - Answers-Extra (supernumerary) teeth.
.Hypodontia - Answers-Too few teeth. Most commonly 3rd molars, 2nd premolars and
Mx laterals.
.(Total) Anodontia - Answers-all teeth congenitally missing. Has a genetic etiology.
.Partial Anodontia - Answers-One or a few missing teeth
Result of hereditary factors that preclude the initiation of the tooth buds
Most commonly missing teeth: 3rd molars, maxillary lateral incisors, mandibular 2nd
premolars
Least common missing teeth: canines
.Oligiodontia - Answers-6 or more congenitally missing teeth, excluding the 3rd molars
.abnormal tooth size - Answers-Caused by a distance during the bell stage of
morphodifferentiation
, Most commonly has a genetic etiology (all with
-dontia, has genetic etiology)
.True Macrodontia - Answers-ALL teeth are enlarged
.False Macrodontia - Answers-1 or a few teeth too large
Most commonly seen in canines, incisors, and mandibular 3rd molars
.True Microdontia - Answers-ALL teeth are abnormally small. Rare disorder. Seen in
cases of growth hormone deficient dwarfism.
.False Microdontia - Answers-♣ Most common tooth size abnormality
♣ Individual teeth appearing smaller than normal
♣ Most commonly affects maxillary lateral incisors (Peg lateral) and maxillary 3rd molars
.Microdontia - Answers-Teeth too small. Most commonly a peg lateral incisor. False
Microdontia - Most affects permanent maxillary laterals (peg laterals).
.Dental Fluorosis - Answers-Mottled enamel
Hypomaturation of the enamel due to excess ingestion of fluoride during enamel
formation.
Forms caries resistant teeth.
.Attrition - Answers-Wearing away of tooth structure by grinding or clenching. Causes
loss of vertical dimension.
.Abrasion - Answers-Wearing away of tooth structure by an object. (toothbrush, floss,
bobby pins)
.Tooth Erosion - Answers-Wearing away of tooth structure by chemical dissolution.
(Dietary acid or gastric acid)
.Abfraction - Answers-Wearing away of tooth structure near the CEJ by flexural forces
exerted during heavy occlusion. Resembles toothbrush abrasion.
.Impaction - Answers-Teeth fail to erupt.
.Ankylosis - Answers-Where bone fuses to the cementum and dentin of a tooth.
Prevents exfoliation of primary teeth and eruption of underlying permanent tooth.
.Supernumerary teeth - Answers-an excessive number of teeth that has a normal
morphology
