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Dental Anatomy

Dental Anatomy. Nomenclature. Maxilla Mandible. Deciduous Teeth. Primary Teeth Post-natal development spans 2-1/2 years Usually 20 in number 4 incisors 2 canines 4 molars per arch. Deciduous Teeth. In clinical practice they are designated by letters: A to T. Permanent Teeth.

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Dental Anatomy

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  1. Dental Anatomy M.E. Mermigas, DDS

  2. Nomenclature • Maxilla • Mandible M.E. Mermigas, DDS

  3. Deciduous Teeth • Primary Teeth • Post-natal development spans 2-1/2 years • Usually 20 in number • 4 incisors • 2 canines • 4 molars per arch M.E. Mermigas, DDS

  4. Deciduous Teeth • In clinical practice they are designated by letters: A to T M.E. Mermigas, DDS

  5. Permanent Teeth • Development begins with the eruption of the first molars and exfoliation of the deciduous incisors • Process requires 20 years to complete • Usually 32 in number • In clinical practice they are designated by numbers: 1 to 32 M.E. Mermigas, DDS

  6. The Crown and Root • Crown- portion above the gingivae covered with enamel • Root- portion below covered with cementum • They are joined at the cemento-enamel junction (CEJ) M.E. Mermigas, DDS

  7. Dentin • Comprises the main bulk of tooth structure • Histologically analagous to bone in composition M.E. Mermigas, DDS

  8. Pulp Chamber and Canal • Contain the pulpal tissue • Nervous, arteriolar and venous tissue • fibrous tissue M.E. Mermigas, DDS

  9. The Crown • Incisors have an incisal edge • Canines have a single cusp • Premolars and Molars have 2 or more cusps • These are the cutting surfaces of the teeth M.E. Mermigas, DDS

  10. Incisor M.E. Mermigas, DDS

  11. Canine M.E. Mermigas, DDS

  12. Premolar M.E. Mermigas, DDS

  13. Molar M.E. Mermigas, DDS

  14. The Root • May be single or multiple • Firmly positioned in the boney process of the jaw called the alveolus • The alveolus together with the teeth forms the dental arch • The cervical area of the teeth are usually covered with a soft tissue, the gingivae M.E. Mermigas, DDS

  15. Surfaces and Ridges • Incisors and Canines- four surfaces and a ridge • Molars and Premolars- five surfaces M.E. Mermigas, DDS

  16. Surfaces- named according to positions and uses • Facial- toward the lips or cheeks • Lingual- toward the tongue M.E. Mermigas, DDS

  17. Surfaces • Occlusal- come in contact with those of the opposing jaw, molars and premolars only • Incisal- Those surfaces on the incisors and canines coming into contact with the opposing teeth M.E. Mermigas, DDS

  18. Proximal Surfaces • Surfaces coming into contact with the adjacent teeth • Mesial- toward the midline • Distal- away from the midline • Which teeth have the mesial surfaces touching each other? M.E. Mermigas, DDS

  19. an elevation or mound on the crown portion of a tooth making up a divisional part of the occlusal surface Cusp M.E. Mermigas, DDS

  20. M.E. Mermigas, DDS

  21. A smaller elevation on the same portion of the crown produced by an extra formation of enamel. Deviation from typical form. Tubercle M.E. Mermigas, DDS

  22. Cingulum • The lingual lobe of an anterior tooth M.E. Mermigas, DDS

  23. M.E. Mermigas, DDS

  24. Any linear elevation on the surface of a tooth and is named according to its location Ridge M.E. Mermigas, DDS

  25. Marginal Ridge Those rounded borders of enamel that form the mesial and distal margins of the occlusal surfaces of premolars or molars, and the lingual surfaces of anterior teeth M.E. Mermigas, DDS

  26. M.E. Mermigas, DDS

  27. descend from the cusp tips of molars and premolars toward the central part of the occlusal surface Triangular Ridges M.E. Mermigas, DDS

  28. M.E. Mermigas, DDS

  29. Crosses the occlusal surface of maxillary molars in an oblique fashion Oblique Ridge M.E. Mermigas, DDS

  30. M.E. Mermigas, DDS

  31. An irregular depression or concavity Fossa M.E. Mermigas, DDS

  32. M.E. Mermigas, DDS

  33. A long depression or valley in the surface of a tooth between ridges and cusps Sulcus M.E. Mermigas, DDS

  34. M.E. Mermigas, DDS

  35. A shallow groove or line between the primary parts of the crown or root Developmental Groove M.E. Mermigas, DDS

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  37. Small pinpoint depressions located at the junction of the developmental grooves Pits M.E. Mermigas, DDS

  38. M.E. Mermigas, DDS

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  40. M.E. Mermigas, DDS

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