Difference between
the permanent teeth and deciduous teeth.
Up to 6 or 7 years old, the human species has only 20 teeth, teeth or dentition
call expires, commonly known as milk, to be replaced by a total of 32 teeth
that are permanent dentition or permanent dentition, with four groups of teeth
with specific functions.
The function of these first teeth are preparing food for digestion and
assimilation in phases in which the child is in full growth; guide eruption in
maintaining space for permanent teeth, stimulate the growth of the jaw with
chewing ; phonation: the anterior teeth involved in the creation of certain
sounds.
Permanent dentition
Deciduous teeth after the teeth are pushed by a second dentition. These first
teeth fall naturally arise, leaving to the latter.
How does the tooth
develop?
The development of dental tooth is a very complex set of processes that allow
the eruption of teeth for histological and functional modification of
totipotent embryonic cells. Possession of teeth is common to many different species,
tooth development is quite similar to humans. In humans, it requires the
presence of enamel, dentin, cement and periodontium to allow the oral cavity
environment is conducive to development, which occurs during fetal development.
The first milk teeth start to fall out at 8 or 9 years old being replaced by
permanent teeth, or second dentition.
Types of teeth definitive
According to the shape of the crown and therefore its function, there are four
types of teeth:
1. Incisors (8 teeth): anterior teeth with sharp edges. Its
main function is to cut food. They have a conical crown and a root only. The
upper incisors are larger than the lower.
2. Canines (4 teeth) pointed cusp shaped. They are called
tusks in animals. They are located next to the incisors and their function is
to tear food.
Premolars (8 teeth) have two pointed cusps. Facilitate
the crushing of food.
4. Molars (12 teeth): broad peaks. They have the same
function of the premolars. The crown of these teeth may have four or five
prominences, like two, three or four raíces.Son the largest.
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