Dental factors affecting occlusal development Dental factors affecting occlusal development Dr. Ahmed AL-Mayali B.D.S M.Sc. Ortho.

The size of the dentition in relation to jaw size

Dental arch crowding theories First theory Decrease jaw Primitive diet

Soft diet Modern diet is largely responsible for crowding

Second theory Interbreeding of people

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

2-Impaction of teeth

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

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

2-Over eruption of opposing teeth

3-Psychological effects on child and parents

4- Effect on the position of permanent teeth

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

A-When there is ample space in the dental arch

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

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

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

The effects of asymmetric loss of primary teeth

Space maintenance Space maintainer

Types of space maintainer 1-Removable space maintainer

2-Fixed space maintainer

Thank you for listening