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.

Development and eruption of teeth

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.

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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.

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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.