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Developmental Disturbances #7
Oral Pathology
58
Dentistry
Professional
08/03/2013

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Cards

Term
Ankylosis definition
Definition
Abnormal immobility or consolidation of a joint
Term
Pathogenesis of ankylosis
Definition
direct fusion of tooth to bone in at least part of PDL space, results in cessation of tooth eruption after emergence into oral cavity
Term
Definition of hypodontia
Definition
common isolated single or multiple missing teeth
Term
Most common teeth missing in hypodontia
Definition
third molars, second premolars, lateral incisors
Term
Hypodontia of permanent missing teeth is associated with...
Definition
Reduced alveolar development, retained primary teeth
Term
True or false: absence of deciduous tooth strongly associated with absence of permanent successor
Definition
Term
Anodontia
Definition
Total lack of tooth development
Term
Oligodontia
Definition
Lack of development of 6 or more teeth
Term
Multiple missing teeth is...
Definition
hereditary hypohydrotic ectodermal dysplasia
Term
Hyperdontia
Definition
common isolated or multiple supernumerary teeth
Term
Teeth most affected by hyperdontia
Definition
maxillary incisors (mesiodens), maxillary and mandibular molars (paramolars and distomolars) premolars, canines, lateral incisors
Term
Mesiodens are associated with what teeth and developmental alteration
Definition

Maxillary incisors

Hyperdontia

Term
Accessory teeth are present when?
Definition

At or shortly after birth

- Natal teeth (present at birth)

- Neonatal teeth (erupt w/in 30 days of after birth)

Term
Common isolated single microdonts are...
Definition

- Maxillary lateral incisor (peg lateral)

- Max and Mand third molars

Term
Generalized microdontia can be associated with which disorders?
Definition
Pituitary dwarfism, down syndrome
Term
Common isolated macrodonts
Definition

Incisors, canines

2nd premolars & third molars

Term
Generalized macrodontia associated with which diseases
Definition
Pituitary gigantism, otodental syndrome, XXY male, pineal hyperplasia w/ hyperinsulinism
Term
Definition of gemination
Definition
attempt of single tooth bud to divide, resulting in a tooth w/ bifid crown and usually common root and root canal
Term
Definition of fusion
Definition
union of two normally separated tooth buds resulting in a joined tooth w/ confluence of dentin
Term
Definition of concresence
Definition
Two or more fully formed teeth joined by cementum only, withOUT confluence of underlying dentin
Term
Talon cusp definition
Definition
delineated additional cusp on surface (usually lingual) of anterior tooth extending at least half the distance from CEJ to incisal edge
Term
Characteristics of talon cusp
Definition

three-prolonged pattern resembleing eagle's talon

composed of enamel and dentin and most contain pulp extension

Term
Teeth most commonly seen with talon cusp
Definition
lingual surface of maxillary lateral or central incisors
Term
Accessory cusps
Definition
Cusp of carabelli, talon cusp, dens evaginatus
Term
Dens evaginatus definition
Definition
Cusp-like elevation of tooth structure located in central groove or lingual ridge of buccal cusp of a premolar or molar tooth
Term
Characteristics of dens evaginatus
Definition

Normally consists of enamel and dentin but also contains pulpal extension in about 50% of cases

 

Term
Teeth most commonly seen with dens evaginatus
Definition
Most commonly mandibular premolars and usually bilateral
Term
Dens invaginatus (dens in dente) definition
Definition
deep invagination of tooth crown or root which is lined by enamel
Term
Teeth most commonly affected by dens invaginatus
Definition
Permanent lateral incisors, centrals, premolars, canines and molars; great majority are max teeth
Term
True or False: dens invaginatus can be classified in types 1-3, progressively getting worse in each type
Definition
True.
Term
What are the two types of dens invaginatus?
Definition
Coronal dens, radicular dens
Term
Which dens invaginatus type is seen more frequently?
Definition
Coronal dens invaginatus
Term
Characteristics of coronal dens invaginatus
Definition

strong maxillary predominance

Classes 1-3 depending on how deep extends into tooth

Term
Characteristics of radicular dens invaginatus
Definition

Rare

Thought to arise secondarily to proliferation of Hertwig's rooth sheath, w/ formation of a strip of enamel extending along surface of root

Altered enamel forms surface invagination into dental papilla

Term
Definition of ectopic enamel
Definition
Presence of enamel in unusual locations, mainly tooth root
Term
Types of ectopic enamel
Definition

Enamel pearls

Cervical enamel extensions

Term
Enamel pearls arise from...
Definition
Odontoblastic layer
Term
True or false: enamel pearls consist of enamel only.
Definition
False. Consist of enamel, can consist of dentin and pulp too
Term
Description of cervical enamel extensions
Definition

Forms triangular extension of coronal enamel that develops on buccal surface of molar teeth directly overlying birfurcation

Base of traingle is continuous w/ inferior portion of coronal enamel, leading point extends directly toward bifurcation of tooth

Term
Where are enamel pearls most commonly seen?
Definition
Roots of maxillary molars
Term
Race most commonly seen w/ enamel pearls
Definition
Asians
Term
Most common location of enamel pearls
Definition
roots or near furaction area
Term
Cervical enamel extensions affects Mandibular or maxillary teeth more commonly?
Definition
slightly mandibular
Term
True or false: cervical enamel extensions have been associated w/ development of inflammatory cysts, along buccal furaction area.
Definition
True.
Term
Definition of taurodontism
Definition
enlargement of body and pulp chamber of a multi-rooted tooth w/ apical displacement of pulpal floor and bifurcation of the roots
Term
Pattern of molar formation found in ancient Neanderthals is associated with what?
Definition
Taurodontism
Term
Overall shape of taurodont is similar to molar of ____ animals?
Definition
cud-chewing
Term
Definition of hypercementosis
Definition
Non-neoplastic deposition of excessive cementum that is continuous w/ normal radicular cementum
Term
What teeth are most commonly affected by hypercementosis?
Definition
Mandibular molar
Term
Treatment of hypercementosis
Definition
None
Term
Is hypercementosis associated with any disease(s)?
Definition

Yes, Paget's disease of bone

Most often not associated to systemic disease

Term
Definition of dilaceration
Definition
Abnormal angulation or bend in root OR less freq crown
Term
Most cases of dilaceration are ______
Definition
idiopathic
Term
Teeth most commonly affected by dilaceration
Definition
Mand 3rd molars
Term
Theory of how dilaceration occurs (most commonly)
Definition
# of teeth w/ this appear to arise after an injury that displaces calcified portion of tooth germ and remainder of tooth formed at abnormal angle
Term
What factors determine extent of tooth's malformation
Definition

Age of pt

Direction

Degree of force

Term
Treatment/Prognosis of dilaceration
Definition
Varies depending on severity of deformity
Term
Supernumerary roots
Definition
Increase # of roots on tooth, can occur in any teeth, no treatment needed
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