1. Dental factors affecting occlusal development Dental factors affecting occlusal development Dr. Ahmed AL-Mayali B.D.S M.Sc. Ortho. ahmed.almayali@uokufa.edu.iq

2. The size of the dentition in relation to jaw size

3. Dental arch crowding theories First theory Decrease jaw Primitive diet

4. Soft diet Modern diet is largely responsible for crowding

5. Second theory Interbreeding of people

6. The effects of excessive dentition size. 1-Overlapping and displacement of teeth.

7. 2-Impaction of teeth

8. Space closure after extraction Less in incisor More in upper jaw Primary ………..28 months Permanent ……3…9………

9. The effects of early loss of primary teeth 1-Effect on function and oral health Masticatory Speech Remove infection Reduce caries

10. 2-Over eruption of opposing teeth

11. 3-Psychological effects on child and parents

12. 4- Effect on the position of permanent teeth

13. How premature loss of primary teeth can affect the position of permanent teeth?

14. A-When there is ample space in the dental arch

15. B- When there is just enough space for the permanent teeth to erupt without crowding

16. C- When there is slight crowding potential in the dental arch for the permanent teeth

17. D- When there is severe crowding potential in the dental arch for the successional teeth

18. The effects of asymmetric loss of primary teeth

19. Space maintenance Space maintainer

20. Types of space maintainer 1-Removable space maintainer

21. 2-Fixed space maintainer

22. Thank you for listening