Which deciduous tooth cause crowding in lower anterior region if early extracted:
a- Primary mandibular first molar ***
b- Primary mandibular second molar.
C- The lower lateral primary incisor.
Dental development begins during fetal development. Ranging from the first month to the last months of intrauterine life. This development continues, of course, after birth and the onset of the emergence of white teeth sequentially.
In terms of number, we find in the child's mouth 20 white teeth after their full maturity. 10 In each decoder and for the ease of study, divide the single jaw into the right and left sections from the middle line (the imaginary column that divides the face into two right and left symmetrical sections).
Sequence of lactic tooth eruption:
The lower folds are the first temporary teeth to appear in the mouth. They grow at 6-7 months.
Followed by thaenia and upper quartiles at the age of 8-11 months.
Lower quaternities at the age of the year.
Then the upper and lower first siblings emerge at the age of 14-18 months.
The upper and lower canines are one and half years old.
And finally the second upper molar at the age of two years and the lower a few months later. Until the teeth are fully mature at the age of 2.5-3 years.
One of the advantages of occlusion in children is that the upper incisors are applied to the lower incisors in an extreme manner, ie, that none of these incisors does not advance or retreat from the other.
These teeth are characterized by the presence of spaces between them, an average of 1-2 mm, and this is very natural does not require concern from parents, on the contrary, the absence of these spaces, which connect teeth together tightly, is an indication that the permanent teeth will overlap on each other.
Mixed teeth:
Which is the period of occlusion between 6-12 years of age, the emergence of the first permanent molar, which occupies the sixth in the order of the line of teeth teeth, to the fall of the last temporary age and replace.
This period has been divided into two phases:
First: the stage of switching the upper and lower cutters, which extends from 6-8.5 years.
Second: the stage of changing the fangs and booths, ie between 10-13 years. This period is important in terms of orthodontic treatments because most of the occlusion problems manifest during this period.
Standing teeth:
The adult adult has 32 teeth in his mouth, 16 years in each jaw. This means that there are 8 teeth in each half of the jaw, which are distributed as follows from the middle line and towards the back, (1) fold. (2) Quadband. (3) Nap. (4) First laugh. (5) The second laugh. (6) First Rahi. (7) Second time. (8) Third Journey (spit of reason).
This stage begins with the end of the last temporary tooth replacement and replacement of any between 12-13 years.
The second permanent echoes often appear without problems, and this period continues until the third molar eruption at the age of 17-20 years, and their emergence is sometimes accompanied by problems of adhesion due to the formal or volumetric abnormalities of these teeth or their emergence late after the growth of the jaws is almost complete.
The most important of these problems attributed to the third heirs is the overlay in the level of the front teeth, especially the lower.
However, not every overlay of the front teeth returns to the emergence of the lower third trimester because it may appear even during the absence of the third buds.
Dental development begins during fetal development. Ranging from the first month to the last months of intrauterine life. This development continues, of course, after birth and the onset of the emergence of white teeth sequentially.
In terms of number, we find in the child's mouth 20 white teeth after their full maturity. 10 In each decoder and for the ease of study, divide the single jaw into the right and left sections from the middle line (the imaginary column that divides the face into two right and left symmetrical sections).
Sequence of lactic tooth eruption:
The lower folds are the first temporary teeth to appear in the mouth. They grow at 6-7 months.
Followed by thaenia and upper quartiles at the age of 8-11 months.
Lower quaternities at the age of the year.
Then the upper and lower first siblings emerge at the age of 14-18 months.
The upper and lower canines are one and half years old.
And finally the second upper molar at the age of two years and the lower a few months later. Until the teeth are fully mature at the age of 2.5-3 years.
One of the advantages of occlusion in children is that the upper incisors are applied to the lower incisors in an extreme manner, ie, that none of these incisors does not advance or retreat from the other.
These teeth are characterized by the presence of spaces between them, an average of 1-2 mm, and this is very natural does not require concern from parents, on the contrary, the absence of these spaces, which connect teeth together tightly, is an indication that the permanent teeth will overlap on each other.
Mixed teeth:
Which is the period of occlusion between 6-12 years of age, the emergence of the first permanent molar, which occupies the sixth in the order of the line of teeth teeth, to the fall of the last temporary age and replace.
This period has been divided into two phases:
First: the stage of switching the upper and lower cutters, which extends from 6-8.5 years.
Second: the stage of changing the fangs and booths, ie between 10-13 years. This period is important in terms of orthodontic treatments because most of the occlusion problems manifest during this period.
Standing teeth:
The adult adult has 32 teeth in his mouth, 16 years in each jaw. This means that there are 8 teeth in each half of the jaw, which are distributed as follows from the middle line and towards the back, (1) fold. (2) Quadband. (3) Nap. (4) First laugh. (5) The second laugh. (6) First Rahi. (7) Second time. (8) Third Journey (spit of reason).
This stage begins with the end of the last temporary tooth replacement and replacement of any between 12-13 years.
The second permanent echoes often appear without problems, and this period continues until the third molar eruption at the age of 17-20 years, and their emergence is sometimes accompanied by problems of adhesion due to the formal or volumetric abnormalities of these teeth or their emergence late after the growth of the jaws is almost complete.
The most important of these problems attributed to the third heirs is the overlay in the level of the front teeth, especially the lower.
However, not every overlay of the front teeth returns to the emergence of the lower third trimester because it may appear even during the absence of the third buds.
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