1. Dr. Bushra Rashid Noaman
Eruption of teeth
Dr. Bushra Rashid Noaman

2. Normal eruption process

3. Objectives The factors that have been related to the eruption of teeth
Chronologic development And eruption of the teeth
Sequence of eruption of the permanent teeth
Variations in sequence of eruption

4. The factors that have been related to the eruption of teeth include,
The factors that have been related to the eruption of teeth include

5. 1.elongation
of the root

6. 2. forces exerted by the vascular tissues around and beneath the root

7. 3. growth of the alveolar bone, 4. Growth of dentin 5
3.growth of the alveolar bone, 4. Growth of dentin 5. growth and pull of the periodontal membrane, 6. presence of a viable dental follicle

8. 7. hormonal influences 8. pressure from the muscular action 9
7. hormonal influences 8.pressure from the muscular action 9. resorption of the alveolar crest.

9. hormonal influence in tooth eruption
pituitary growth hormone
thyroid hormone
and parathyroid hormone
Hormones protein is required for tooth eruption.

10. For permanent teeth
Variations of 6 months on either side of the usual eruption date may be considered normal for a given child.

11. Tooth eruption is a series of metabolic events in alveolar bone characterized by
bone resorption and bone formation on opposite sides of the dental follicle and the tooth does not contribute to this process."

12. So Teeth erupt before the root development is complete.
Tooth emergence appeared to be more closely associated with the stage of root formation than with the chronologic or skeletal age of the child
Q. When does the time of clinical emergence of a tooth into the oral cavity
approximately three fourths of root formation had occurred.
So Teeth erupt before the root development is complete.

14. Primary root completion nearly 12-18 months after eruption
Most favorable eruption of primary teeth:
ABDCE

15. Root of the primary tooth start to resorb directly after root completion this called physiologic resorption Eruption of the permanent tooth cause the root resorption of the primary tooth root from the inner side of the root this will continue until the exfoliation of the primary tooth

16. 5 years for permanent teeth.
Q. when the tooth starts to move toward the occlussion?
Each tooth starts to move toward occlusion at approximately the time of crown calcification completion.“
Q. How much the interval from crown completion until the tooth is in full occlusion ?
is approximately
5 years for permanent teeth.
In primary teeth differ in anterior and posterior teeth so it is between 4-18 months

17. Five years old child

18. CHRONOLOGIC DEVELOPMENT AND ERUPTION OF THE TEETH

19. molar
molar

20. 6-7 MONTHS INFANT
14 MONTHS INFANT

23. Desirable eruption sequence for the permanent teeth
the most common sequence of eruption of permanent teeth in the mandible is 6, 1, 2, 3, 4,5, and 7.
the maxillary permanent teeth is 6, 1,2, 4, 5, 3, and 7.

24. The mandibular first permanent molars are often the first permanent teeth to erupt.
They are quickly followed by the mandibular central incisors.

25. Why this sequence is necessary?
This sequence aids in having healthy occlusion by:
1. maintaining adequate arch length
2. preventing lingual tipping of the incisors.

26. VARIATIONS IN SEQUENCE OF ERUPTION

27. 1. PREMATURE LOSS OF PRIMARY MOLARS
(INFLUENCE OF PREMATURE LOSS OF PRIMARY MOLARS ON ERUPTION TIME OF THEIR SUCCESSORS)

28. Early extraction of primary molars
in children who lose primary molars before 7 years of age will cause:
Eruption of the premolar teeth is delayed

29. premature loss of primary molars At 8, 9, and 10 years of age,
premolar eruption is greatly accelerated.

30. 2. Early loss of primary canine in the mandible
will cause lingual tipping of the mandibular incisors

31. Lingual tipping of the incisors causes :
1.a loss of arch length
2. allows the development of an
increased overbite.
So if there is early loss of lower primary canines you must construct a space maintainer.