Mixed Dentition and Occlusion Module 12

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

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

Ages 6-7

Ages 7-8

Ages 10-12

Eruption of Permanent Dentition Ages 11-13

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

Importance Chewing Speaking Appearance Comfort Overall health

Malocclusion Improper positioning of teeth and jaws

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

Vertical Overlap

Horizontal Distance

Relationship of Teeth

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

Angle’s Classification

Class I

Class II, Division 1

Class II, Division 2

Class III

Other Characteristics of Malocclusion

Open Bite

Edge-to-Edge

Deep Overbite

Crossbite

Malposition of Individual Teeth

Facioversion

Linguoversion

Supraversion

Rotated