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ORAL ANATOMY & ORAL HISTOLOGY

ORAL ANATOMY & ORAL HISTOLOGY. Diphyodont Polyphyodont. Hetero dont Homodont. MAN  Diphyodont - Heterodont. “Deciduous”  Latin means “FALL OFF” “Milk teeth” – “Temporary teeth” – “Baby tooth”. 6 months – 2 years Mixed dentition period  6 – 12 years

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ORAL ANATOMY & ORAL HISTOLOGY

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  1. ORAL ANATOMY&ORAL HISTOLOGY

  2. Diphyodont Polyphyodont

  3. Hetero dont Homodont MAN  Diphyodont - Heterodont

  4. “Deciduous”  Latin means “FALL OFF” “Milk teeth” – “Temporary teeth” – “Baby tooth”

  5. 6 months – 2 years Mixed dentition period  6 – 12 years Permanent teeth – 6 yrs to 21yrs

  6. Maxillary – upper jaw Mandibular – lower jaw

  7. Functions of teeth Mastication (Chewing) Phonation (Speech) Esthetics (Appearance) Self protection

  8. Parts of a Tooth Crown Root Cervix / neck R O O T CROWN

  9. MOLAR TOOTH CROWN R O O T R O O T

  10. Anatomical Crown – covered by enamel Clinical Crown – visible in the oral cavity

  11. Anatomical Root – covered by Cementum Clinical Root – Covered by gingiva

  12. Types of Teeth: Incisors: Have a sharp thin edge  cutting. Canines: cutting and tearing. Premolars:have two cusps  tearing and crushing. Molars: Have 4 to 5 cusps and a broad surface  grinding and chewing

  13. Structure of Tooth and Supporting Structures

  14. Enamel Outermost covering Hardest Yellowish - grayish white Non-living tissue

  15. Dentin Hard – connective tissue Bulk of the tooth Covered by Enamel – Crown Cementum - Root

  16. Cementum Covers Root Yellowish Anchorage

  17. Pulp Soft connective tissue Central portion Nerves and blood vessels Cells, fibers, intercellular substance

  18. Supporting structures of teeth Alveolar sockets Periodontal ligament (collagen fibers)

  19. Junctions Cemento – Enamel Junction Dentino – Enamel Junction Cemento – Dentinal Junction

  20. Types of Dentition Deciduous Teeth Permanent Teeth

  21. Deciduous teeth Primary teeth Baby teeth Milk teeth Lacteal dentition

  22. Dental formula 2 1 2 2 1 2

  23. Permanent teeth Secondary dentition Successor / Succedaneous teeth Non-successor / Non-succedaneous teeth

  24. Formulae for teeth I – Incisor , C – Canine , P – Premolar , M – Molar

  25. 2 1 2 3 I C P M

  26. Dental formula 2 1 2 3 2 1 2 3

  27. Dental formula for Deciduous teeth I 2 / 2 C 1/ 1 M 2 / 2 = 10  2 x 10 = 20 Dental formula for Permanent teeth I 2/2 , C 1/1 , P 2/2 , M 3/3 = 16  2 x 16 = 32

  28. Position of teeth Anterior Teeth Posterior Teeth

  29. Facial Surface 1.Labial 2.Buccal

  30. Lingual / Palatal 1.Palatal 2.Lingual

  31. Incisal / Occlusal 1.Incisal 2.Occlusal

  32. Proximal surface 1. Mesial 2. Distal

  33. Tooth numbering system Recording data Communication

  34. 1. Zsigmondy / Palmer notation 2. Universal system 3. FDI ( Federation Dentaire Internationale)

  35. Zsigmondy - Palmer notation / Grid system Adolph Zsigmondy in 1861 Arches are divided quadrants Deciduous teeth A B C D E E D C B A Left Right A B C D E E D C B A

  36. Permanent teeth Central incisor numbered 1 through 8 in each arch left Right 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8 8 7 6 5 4 3 2 1 1 2 3 4 5 6 7 8

  37. Advantages Many countries use this system Simple Disadvantage More Chances of error in noting sides

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