Dental Anomalies Flashcards
The initiation stage of tooth development starts at approximately _______ in utero
_____ cells of the ________ proliferate
The ______ becomes distinctive from the ______ and connects the developing tooth bud to ______
6 weeks
Basal cells, oral epithelium
Dental lamina, oral epi, oral epi
In the bud stage, _____ proliferate into the ____ of the jaw
The cells are _____
The actual tooth bud is a group of cells at the _____ of the _______
Epithelial cells, ectomesenchyme
Not clearly arranged yet
Periphery of the dental lamina
In the cap stage, a small group of _____ form the dental papilla
The tooth bud (_____) grows around _____ and takes on a cap shape
Eventually, the tooth bud forms ___ and the dental papilla forms _____ and _____
Ectomesenchymal cells
Enamel organ, dental papilla
Enamel, dentin and pulp
In the bell stage, the enamel organ is ____ shaped and ___________ takes place
The _______ disintegrates, separating tooth from ______
During the late bell stage, ______ and _____ (_______) develop
Bell
Morphodifferentiation
Dental laminate, oral epithelium
Enamel and dentin (hard tissues)
Anodontia means _____________
Total anodontia =
Partial anodontia/hypodontia =
Oligodontia =
The cause of anodontia is that _________ inhibit _________ from forming
Absence of teeth
Total= complete absence of teeth
Partial = partial absence of teeth
Oligodontia= 6+ teeth absent
Congenital factors inhibit one or more tooth buds from forming
Hereditary ectodermal dysplasia is a genetic disorders involving __________ (____)
The ectoderm forms :
What dental anomaly is associated with this condition?
Abnormal development of the ectoderm (outer embryonic cell layer)
Ectoderm forms: teeth, skin, nervous system, sweat glands, hair, nails
Complete anodontia !!!!
What are the most common absent teeth in partial anodontia/hypodontia (in order)
Most common :Third molars (especially max)
2nd: max laterals
3rd: mand 2nd pm
What is supernumerary teeth?
Supernumerary teeth results from the ______ of permanent tooth bud
In what dentitions does it occur?
In which jaw is it most common?
More than usual teeth
Results from splitting of permanent tooth bud
In both permanent and primary dentitions
Most often in maxilla
What are the most common locations of supernumerary teeth? (In order)
Most common: max incisors (max midline)
2nd: third molar area (mostly max)
3rd: mand pm area
________ are small, ______ shaped supernumerary tooth that forms between max central incisors
Mesiodens, cone-shaped
Supernumerary third molars, sometimes called “______” _______ erupt and are often ____ found on X-ray
Fourth molars
Rarely erupt
Incidental findings
Supernumerary mand pm generally _____ anatomically
And are often crowded or positioned ____ (or ______)
Resemble pm
Lingually (or facially)
Normal shaped tooth, but larger in size is called _________
And is usually seen in _____ and _____, oftentimes associated what system conditions like _______
Macrodontia
Incisors and canines
Gigantism
Normal shaped tooth, but smaller in size is called ______
And usually affects _____ and ________
Microdontia
Max lateral and third molars
Peg laterals ( a form of _____) tend to be ________ shaped
The development of the peg lateral occurs from _____ lobe instead of the normal ___ lobes
(Microdontia)
Cone shaped
1 lobe vs 4 lobes
Incomplete splitting of a single developing tooth into two is called _________
These teeth have ___ root and _____ pulp chamber
How does the tooth appear?
Where is this most common?
Gemination (twinning)
1 root and 1 pulp chamber
Tooth appears extra wide with a notch
Most common in primary dentition and max anteriors
When two separate adjacent crowns fuse together and appear to be double in width it is called ______
There are ____ root and _____ separate pulp chambers
When does this occur?
Fusion
2 roots and 2 separate canals
Occurs by pressure or force during development of adjacent roots
What conditions is associated with Hutchinson’s Incisors?
How do these teeth appear?
Congenital syphillis (passed from mother)
Appear notched, broad cervical, more narrow incisally
What conditions is associated with Mulberry Molars?
Which molars are affected and how do they appear?
Congenital syphilis
First molars, appear with occlusal anatomy made of tiny tubercles and poorly developed cusps (look like little berries)
What are talon cusps and which teeth do they affect?
What surface?
What might happen if these cusps are removed to restore occlusion?
Extra cusp on lingual surface of anterior teeth
Endo therapy might be necessary since cusp might have a pulp horn