All of us would love to have a gleaming smile on our face. It usually a result of crystal white beaming teeth. But what will happen when the teeth have a cone-shape and are significantly smaller than average, there might not be that attraction as compared to normal
Dentin dysplasia (DD) is a rare hereditary disturbance is inherited as an autosomal dominant trait.
unknown etiology that affects approximately 1 :100,000.
In 1972, Witkop classified it into type I and type II which affect both dentitions.DD Type I
Radicular dentin dysplasia
Characterized by:-
1.Both dentitions are affected.
2.Normal appearing crowns
3.No or only rudimentary root development (rootless teeth)
4.Incomplete or total obliteration of the pulp chamber.
5.Teeth may exhibit extreme mobility and exfoliate prematurely.DD type II
coronal dentin dysplasia
Characterized by:-
1.partial pulpal obliteration.
2.Thistle-tube-or flame-shaped coronal pulp chambers
3. Thread-like root canals
4. Usually the absence of periapical radiolucencies.
5. In this type of anomaly, teeth roots are of normal shape and contour.The enamel and the immediately subjacent dentin appear normal.
Deeper layers of dentin show an atypical tubular pattern with an amorphous, atubular area, and irregular organization.
Normal dentinal tubule formation appears to have been blocked so that new dentine forms around obstacles and takes on the characteristic appearances described as “lava flowing around boulders”The radiograph revealed features of dentine dysplasia type I with normal appearance of crown but no root development Autosomal Dominant Disorder:
Manifested in heterozygous states
At least one parent of index case is usually affected
Both males and females are affected.
Clinical feature can be modified by variation in penetrance and expressivity. Some individual inherit the mutant gene but are phenotpically normal. This is reffered to as “incomplete penetrance”.
In many condition the age of onset is delayed.
Inheritance Pattern:
Typical pattern is a heterozygous affected parent with a homozygous unaffected parent.
Every child has one chance in two of having the disease
Both sexes are affected equally..Autosomal Recessive Disorder
Largest category of Mendelian disorder
Usually does not affect the parent of the affected individual, but sibling may show the disease.
Complete penetrance is common.
Onset is frequently early in life.
Usually affect enzymatic proteins.
Pattern Of Inheritance:
Typical pattern is two heterozygous unaffected (carrier) parent.
The triat does not usually affect the parent, but siblings may show the disease
Siblings have one chance in four of being affected
Both sexes affected equally.
All of us would love to have a gleaming smile on our face. It usually a result of crystal white beaming teeth. But what will happen when the teeth have a cone-shape and are significantly smaller than average, there might not be that attraction as compared to normal
Dentin dysplasia (DD) is a rare hereditary disturbance is inherited as an autosomal dominant trait.
unknown etiology that affects approximately 1 :100,000.
In 1972, Witkop classified it into type I and type II which affect both dentitions.DD Type I
Radicular dentin dysplasia
Characterized by:-
1.Both dentitions are affected.
2.Normal appearing crowns
3.No or only rudimentary root development (rootless teeth)
4.Incomplete or total obliteration of the pulp chamber.
5.Teeth may exhibit extreme mobility and exfoliate prematurely.DD type II
coronal dentin dysplasia
Characterized by:-
1.partial pulpal obliteration.
2.Thistle-tube-or flame-shaped coronal pulp chambers
3. Thread-like root canals
4. Usually the absence of periapical radiolucencies.
5. In this type of anomaly, teeth roots are of normal shape and contour.The enamel and the immediately subjacent dentin appear normal.
Deeper layers of dentin show an atypical tubular pattern with an amorphous, atubular area, and irregular organization.
Normal dentinal tubule formation appears to have been blocked so that new dentine forms around obstacles and takes on the characteristic appearances described as “lava flowing around boulders”The radiograph revealed features of dentine dysplasia type I with normal appearance of crown but no root development Autosomal Dominant Disorder:
Manifested in heterozygous states
At least one parent of index case is usually affected
Both males and females are affected.
Clinical feature can be modified by variation in penetrance and expressivity. Some individual inherit the mutant gene but are phenotpically normal. This is reffered to as “incomplete penetrance”.
In many condition the age of onset is delayed.
Inheritance Pattern:
Typical pattern is a heterozygous affected parent with a homozygous unaffected parent.
Every child has one chance in two of having the disease
Both sexes are affected equally..Autosomal Recessive Disorder
Largest category of Mendelian disorder
Usually does not affect the parent of the affected individual, but sibling may show the disease.
Complete penetrance is common.
Onset is frequently early in life.
Usually affect enzymatic proteins.
Pattern Of Inheritance:
Typical pattern is two heterozygous unaffected (carrier) parent.
The triat does not usually affect the parent, but siblings may show the disease
Siblings have one chance in four of being affected
Both sexes affected equally.
Characteristics and features of developmental, hereditary and congenital disorders affecting the teeth and other hard tissues. Genetic concepts of development and role of teratogens on developing tissues,
Anomalies of tooth formation and eruption, MISSING TEETH, EXTRA TEETH, ABNORMALITY OF TOOTH SIZE, Crown size, Root size, Abnormality of crown form, ABNORMALITY OF ROOT FORM, All tissues, Cementum defects, Dentine defects, enamel defects, DISTURBANCES OF ERUPTION & EXFOLIATION,
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A cyst is an epithelium-lined sac containing fluid or semisolid material. In the formation of a cyst, the epithelial cells first proliferate and later undergo degeneration and liquefaction. The liquefied material exerts equal pressure on the walls of the cyst from within. Cysts grow by expansion and thus displace the adjacent teeth by pressure. May can produce expansion of the cortical bone. On a radiograph, the radiolucency of a cyst is usually bordered by a radiopaque periphery of dense sclerotic bone. The radiolucency may be unilocular or multilocular. Odontogenic cysts are those which arise from the epithelium associated with the development of teeth. The source of epithelium is from the enamel organ, the reduced enamel epithelium, the cell rests of Malassez or the remnants of the dental lamina.
2. Trisomy 21 syndrome (down syndrome)
• (Down syndrome [DS]) is one of
the congenital anomalies in
which delayed eruption of the
teeth frequently occurs.
• A study of 127males and 128
females with DS by Ondarza et
al found that, on average, 6
primary teeth were delayed in down syndrome
eruption in boys and 11 primary
teeth were delayed in girls.
3. Cleidocranial dysplasia
• A rare congenital syndrome that has dental
significance.
• The development of the dentition is delayed.
Complete primary dentition at 15 years of age
resulting from delayed resorption of the
deciduous teeth and delayed eruption of the
permanent teeth is not uncommon .
Primary dentition is
still present at 15 years of age.
4. Hypothyroidism
• hypothyroidism is the result
of an absence or under-
development of the thyroid
gland and insufficient
levels of thyroid hormone
• The teeth are normal in
size but are crowded in
jaws that are smaller than
normal.
5. Achondroplastic dwarfism
• This condition may
be related to the
malocclusion and
crowding of the
Delayed eruption of
the teeth has been
linked to teeth.
6. Hypopituitarism
• A pronounced deceleration of the growth of the
bones and soft tissues of the body will result
from a deficiency in secretion of the growth
hormone.
• Delayed eruption of the dentition is
characteristic. In severe cases the primary
teeth do not undergo resorption but instead
may be retained throughout the life of the
person .