1. Mixed Dentition and Occlusion
Module 12

2. Mixed Dentition A child will have a mixed dentition for several years
Consists of a combination of primary and permanent teeth

3. Stages of Eruption of Primary Dentition
2½ to 5½ years of age

4. Ages 6-7

5. Ages 7-8

6. Ages 10-12

7. Eruption of Permanent Dentition Ages 11-13

8. Occlusion The relationship of the teeth to each other
Incisal and occlusal surfaces of mandibular arch occludes with incisal and occlusal surfaces of the maxillary arch

9. Importance
Chewing
Speaking
Appearance
Comfort
Overall health

10. Malocclusion
Improper positioning of
teeth and jaws

11. Malocclusion Effects Bite Ability to maintain adequate plaque control
Speech development
Appearance

12. Vertical Overlap

13. Horizontal Distance

14. Relationship of Teeth

15. Angle’s Classification
1887—Dr. Edward Angle developed a system
Classifies the relationship of mandibular first molar to maxillary first molar
Buccal groove of mandibular first molar and mesiobuccal cusp of maxillary first molar
If first molars are absent, canines can be substituted

16. Angle’s Classification

17. Class I

18. Class II, Division 1

19. Class II, Division 2

20. Class III

21. Other
Characteristics of
Malocclusion

22. Open Bite

23. Edge-to-Edge

24. Deep Overbite

25. Crossbite

26. Malposition of Individual Teeth

27. Facioversion

28. Linguoversion

29. Supraversion

30. Rotated