Developmental Abnormalities of Teeth Flashcards
Opacities – ______ thickness
normal thickness
Hypoplasia – ______ thickness
reduced
Bilaterally symmetric, horizontal zones of
hypoplasia
Febrile illness
Inflammation
Trauma
Periapical pathosis of primary tooth affects
underlying permanent tooth
Trauma to primary tooth affects underlying
permanent tooth
Turner’s tooth
Excessive fluoride during enamel development produces hypomineralized, white chalky areas The enamel matrix protein amelogenin is retained Increased caries resistance
Dental fluorsis
Hutchinson’s incisors
Mulberry molars
Congenital syphyllis
_____ root resorption - begins in dental pulp
Internal
_____ root resorption- begins in periodontal ligament
External
Begins in pulp
Usually asymptomatic
Granulation tissue may cause pink tooth
(IRR)
Pink tooth of mumery
Begins in periodontal ligament
Usually asymptomatic
Trauma, inflammation, cysts, neoplasms,
idiopathic
ERR
A type of external resorption that may resemble internal resorption Begins in cervical PDL area and extends into tooth Often occurs rapidly
Invasive Cervical Resoprtion
Eruption ceases before emergence
Soft tissue impaction – may communicate
with the oral environment
Bony impaction
Impaction
Fusion with alveolar bone
Cessation of eruption after emergence
Retained primary teeth “submerged” teeth
Ankylosis
Teeth present at birth, or in first 30 days of
life
Mandibular incisors most frequent
Prematurely-erupted deciduous teeth not
pre-deciduous supernumerary teeth
Retain, if stable; remove, if danger of
aspiration
Natal
Teeth present at birth, or in first 30 days of
life
Mandibular incisors most frequent
Prematurely-erupted deciduous teeth not
pre-deciduous supernumerary teeth
Retain, if stable; remove, if danger of
aspiration
Natal teeth
Many Syndromes
X-linked inheritance
Defective epidermal structures –
hypodontia, hypotrichosis, hypohidrosis
Ectodermal Dysplasia
What are the 3 teeth that are most commonly missing in hypodontia?
Third molars
Second premolars
Maxillary lateral incisors
What are the 2 teeth that are least commonly missing in hypodontia?
Maxillary central incisors
First molars
What 3 locations are most common for supernumeraries?
Anterior Maxilla – incisors
Posterior Maxilla – fourth molars
Mandibular premolars
Autosomal dominant, many cases are new mutations Intestinal polyposis with 100% malignant transformation Osteomas and jaw bone densities Supernumerary teeth
Gardner syndrome
Generalized - rare Pituitary giantism Hemifacial hyperplasia Localized – also rare Mandibular third molars
Macrodontia
Generalized - rare Pituitary dwarfism Trisomy 21 (Down Syndrome) Localized - common Maxillary lateral incisor Third molars
Microdontia
Count the teeth
Affected tooth counts as one
Tooth count is normal
- 1 pulp chamber
Gemination
Count teeth
Affected tooth counts as one
Tooth count reveals a missing tooth
- 2 pulp chambers
Fusion
2 teeth that are joined together via cementum
Concrescence
Deep surface invagination lined by enamel
Dens-In-Dente
Dens invaginatus
Ectopic deposition of enamel usually found near furcations
Enamel pearl
What is a cause of generalized hypercementosis?
Paget’s disease of bone
An angulation or bend in a tooth root
caused by displacement of the tooth germ
The remainder of the tooth forms at
abnormal angle
Dilaceration
What 3 teeth are most commonly possessing supernumerary roots?
Permanent molars - third molars Mandibular cuspids Mandibular premolars
A group of hereditary diseases involving
defective enamel formation
Fourteen subtypes based on the clinical
phenotype and pedigree
Amelogenesis
Inadequate deposition
Hypoplastic
No significant mineralization
Hypocalcified
Normal enamel matrix, defect in maturation
Hypomaturation
Taurodontism can be seen in accordance with _____
AI
Autosomal dominant Defective formation of dentin May be associated with osteogenesis imperfecta -Opalescent teeth - Abnormally soft dentin
DI
Opalescent teeth Abnormally soft dentin Cervical constriction, producing bulbous appearing crowns with thin roots Obliteration of the pulp spaces
Dentinogenesis imperfecta
In DI, The dentin
immediately adjacent
to the enamel is
_______
normal
T/F: In DI, In the remainder of the dentin, the tubules are disoriented, irregular and widely-spaced
True
What type of DI is seen with Osteogenesis imperfecta?
DI Type 1
What type of DI is seen with Hereditary opalescent dentin?
-No hereditary component
Type 2 DI
What type of DI is seen with shell teeth (brandywine)
Type 3 DI
Dentinogenesis Imperfecta, Type I
Bone fractures
Blue Sclerae
Osteogenesis Imperfecta
Type ___ dentin dysplasia is radicular
Type 1 Dentin dysplasia
Type ___ dentin dysplasia is coronal
Type 2 dentin dysplasia
Autosomal dominant
Pulpal obliteration with chevron-shaped
pulp chambers
Short roots (rootless teeth)
“w-shaped”
Periapical radiolucencies without any obvious cause
Dentin dysplasia Type 1 Radicular
Autosomal dominant Normal root length “Thistle-tube” pulp chambers Pulp stones in most teeth
Dentin dysplasia type 2 (coronal)
A localized developmental abnormality that
involves enamel, dentin and pulp
Not hereditary – idiopathic, possibly due to
an alteration in vascular supply
May affect deciduous or permanent teeth,
with a predominance in the anterior area
-Usually affects several contiguous teeth in
a region
(Pathognomonic) Produces ghost teeth - pale, whispy images
of teeth with extremely thin enamel and
dentin surrounding large radiolucent pulp
Regional odontoplasia
A recently recognized developmental
disorder involving both the teeth and bone
of posterior maxilla
Unilateral expansion of posterior maxillary alveolar process with gingival enlargement
Variable absence of one or both premolars and primary molar anomalies
Delayed eruption of adjacent teeth
Bone exhibits granular, radiopaque appearance
Segmental Odontomaxillary Dysplasia
