Hard Tissues Abnormalities Flashcards
Which abnormality lead to hypomenirlization in both dentin and enamel what we call the teeth is this abnormali?
What we see in radiograph ?
Where is localized?
Is it heredity ?
Regional odontodysplasia
Ghost teeth
Open apices , short roots , enlarged pulp chamber
Region or quadrant
No
Congenital syphilis result in which abnormality ?
What’s the morphology for each one ?
How it occurs ?
- Hutchinson’s incisor:
“screwdriver-shaped” or triangular incisor
interstitial keratitis
teeth abnormalities
deafness
*Mulberry molar: first molars that appear
like a mulberry fruit, with extra and rounded enamel cusps
- when a pregnant mother transmits syphilis to her child in utero or at birth
What’s is Concrescence and Fusion and Gemination ?
How to differentiate?
*Concresence Union of adjacent teeth at the level of
cementum ( roots )
● Enamel, dentin, and pulp are not involved
- Fusion of two teeth at the dentin and pulp
● One fewer tooth (# teeth - 1)
● Two separate pulp chambers - Gemination Attempt of one tooth bud to become two separate teeth trauma can be cause )
● Normal number of teeth
● Single root and pulp chamber
Which common teeth envolved in conceresnce ?
maxillary molars
Fusion mostly to occur in ?
mandibular lateral incisors and canines
Gemintation mostly to occur in ?
Incisors
What’s difference between Dens invaginatus and Dens evaginatus ?
Invaginatus :
● Invagination or infolding of the tooth surface prior to calcification
● “Tooth within a tooth”
Evaginatus :
● Outward folding of the tooth surface prior to calcifications
● Forms a small, extra cusp
What’s the difference in invaginatus and evaginatus complication ?
In : Communication directly to the pulp
Eva : Pulp horns extending into enamel
Both of them end with : pulpal necrosis and apical periodontitis
Which teeth involve more in Dens invaginatus ?
Dens evaginatus
Maxillary lateral incisors
Mandibular premolars
What’s Taurodontism ?
In which cases may occur ?
Elongation of the pulp chamber due to apical migration of the furcation mostly in molars .
● Can occur in patients with amelogenesis imperfecta and
Down syndrome
What’s the 3 types of dens invaginatus ?
Type 1 only crown
Type 2 below CEJ
Type 3 extend to root and pulp can cause perforation ( apical or lateral ).
Infection easily spread to pulp
What’s micro and macrodontia ?
● Macrodontia: a tooth or group of teeth are ** abnormally larger**
● Microdontia: a tooth or group of teeth are abnormally smaller
Which teeth abnormalities can give macro and micro appearance ?
Macrodontia : gemination or fusion
Microdontia : peg shaped lateral
What’s True generalized microdontia ?
All teeth are smaller than normal
Occur in some cases of pituitary dwarfism
Teeth well formed but all small
What’s relative generalized microdontia ?
Normal or slightly smaller than normal teeth
Are present in jaws that are larger than normal
( PROPLEM relate to jaw )
What’s focal microdontia ?
Peg shaped lateral
Which system disease associated with macro and microdontia ?
Macro : pituitary gigantism
Micro : pituitary dwarfism
What’s relative and true generalized macrodontia ?
Relative :
Normal or slightly bigger teeth arranged in small jaws
Results in crowding of teeth
Insufficient arch space is evident
True Generalized :
All teeth are larger than normal
Associated with pituitary gigantism
Which variations related to number ?
Supernumerary teeth ( Hyperdontia , Mesiodens )
Anodontia ( hypo , oligo , adontia )
Impaction
What’s extra tooth variation?
Hyperdontia: presence of supernumerary teeth
Mesiodens: supernumerary tooth between two central incisors
What’s hypo and oligodontia and adontia ?
Hypodontia: 1 to 6 missing teeth, excluding third molars
Oligodontia: greater than 6 teeth missing
Adontia : miss all
Which teeth mostly to be missed ?
Most frequent congenitally missing permanent teeth
maxillary lateral incisors
mandibular second premolars
third molars
Which systemic condition related to extra teeth?
Which teeth mostly involve ?
Cleidocranial dysostosis
Mandibular premolars , lateral incisors
What’s adontia types ?
Complete anodontia
Partial anodontia:
Hypodontia
Oligodontia
Pseudoanodontia
False Anodontia
Which systemic condition associated with adontia ?
Ectodermal dysplasias
Associated with fine, sparse hair, wrinkly skin, and conical-shaped teeth
2 or more tissues of ectodermal origin are affected (skin, sweat glands, hair, nails, teeth, and/or mucous membrane)
What’s the cause of impaction and types ?
Lack of place in the dental arch
Obstruction from crowding
Obstruction from other Physical barrier
Abnormal eruption path because of unusual orientation of the tooth germ
Shape and form abnormality
Types see photo
What’s ankylosis ?
Fusion of the tooth to the surrounding bone
With local loss of periodontal ligament
bone and cementum become inextricably mixed due to fusion of the tooth to alveolar bone
What’s name of ankylosed teeth?
submerged teeth
Mostly affected teeth :
Primary teeth, most commonly mandibular second molars
The teeth undergo variable degree of root resorption
Ankylosis prevents the exfoliation +subsequent replacement by permanent teeth
After adjacent permanent teeth erupt ankylosed tooth appears below the level of occlusion
What’s talons cusp ?
Well expressed additional cusp
On the surface of anterior tooth
Extends at least half the distance from CEJ to the incisal edge
Whts leungs cusp ?
Developmental condition
Accessory cusp or a globule
on the occlusal surface of the premolar between the lingual an buccal cusps
Unilateral or bilateral
What’s enamel pearls ?
Small, round nodule of ectopic enamel most commonly on the root surface , cervical or bifurcation area .
most frequently at the furcation point between
maxillary molar roots
In radiograph opaque area near pulp chamber
Whts deleciration ?
Angualation or a sharp bend or curve of root of a formed tooth
Trauma to a developing tooth can cause formation of root at an angle to normal axis of tooth
