Development And Eruption Of Teeth Question And Answers

Development And Eruption Of Teeth

What is a chronology of deciduous dentition?
Answer:

Chronology of deciduous dentition.

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1. Calcification of primary teeth:

• It begins in utero from 13-16 weeks post-fertilization.
• By 18-20 weeks, all the primary teeth have begun to calcify.
• The first indication of tooth formation occurs as early as the sixth week of prenatal life when the jaws have assumed their initial shape.

2. Crown formation:

• Primary tooth crown formation takes only some 2 completion.

3. Eruption/emergence of primary teeth:

• The emergence of primary dentition takes place between the sixth and thirtieth months of postnatal life.
• It is an important time for the development of oral motor behavior and the acquiring masticator skills.
• After the crown and part of the root are formed, the tooth penetrates the alveolar gingiva and emerges into the mouth.
• The process of eruption is completed when most of the crown has emerged and when it has made contact with its antagonist or antagonists in the opposing jaw.
• The root formation is not complete at this stage.

4. Sequence of the emergence of primary teeth:

• The sequence of eruption of the primary teeth in the individual jaw is.
  1. Central incisor (A)
  2. Lateral incisor (B)
  3. First molar
  4. Canine
  5. Second molar (E)
• The mandibular central incisors emerge first through the alveolar gingiva, followed by the other anterior teeth by about 13-16 months except for canines.
• Then the first primary molars emerge by about 16 months of age and make contact with opposing teeth several months later before the canines have fully erupted.
• The maxillary molar erupts earlier than the mandibular molar.
• The primary maxillary canines erupt at about 19 months while mandibular canines at 20 months.
• Lastly, the primary second mandibular molar erupts at a mean age of 27 months, and the primary maxillary second molar at 29 months.

5. Root completion:

• After the crown of the tooth is formed development of the root portion begins.
• At the cervical border of the enamel, the cementum starts to form as a root covering the dentin.
• Root formation is an active factor in moving the crown toward its final position in the month.
• The formation of root dentin and cementum continues after the tooth is in use.
• The root is completed with a complete covering of momentum.