Tooth Morphology - Chapter 1; Part 4


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Supplementary resource for tooth morphology. UNIT 1,, by Rooban Thavarajah. Definition, Tooth nomenclature

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Tooth Morphology - Chapter 1; Part 4

  1. 1. Dr. Rooban Thavarajah
  2. 2. Dr. Rooban Thavarajah Landmarks • Cusp is an elevation on the crown portion making up a occlusal part • Tubercle: Small elevation of enamel • Cingulum: Lingual lobe of anterior teeth • Ridges: Elevated portion of tooth in a line named for their location – Marginal / Triangular / Transverse/ Oblique
  3. 3. Dr. Rooban Thavarajah Cusps Marginal ridge Triangular ridge Transverse ridge Oblique ridge
  4. 4. Dr. Rooban Thavarajah • Marginal Ridge: Ridge or elevation of enamel forming the margin of the surface of a tooth; specifically, mesial &distal of occlusal surfaces posterior teeth & mesial /distal margins of lingual surfaces anterior teeth
  5. 5. Dr. Rooban Thavarajah • Triangular Ridges: Main ridges on each cusp that run from the tip of the cusp to the central part of the occlusal surface • Transverse Ridge: Union of 2 triangular ridges that cross the posterior surface of a tooth • Oblique Ridge: ML –DB cusp max molars
  6. 6. Dr. Rooban Thavarajah • Developmental grooves: Shallow grooves that separate cusps or primary parts of teeth • Fossa: Depression or concavity – Lingual / central / triangular • Pit: small pinpoint depression found in fossa • Sulcus: Long depression
  7. 7. Dr. Rooban Thavarajah
  8. 8. Dr. Rooban Thavarajah Contact areas, embrasures
  9. 9. Dr. Rooban Thavarajah Proximal Contacts Mesial or Distal – Where one tooth touches another – Prevents food from packing between them – Prevents buildup of excessive bacteria, food or debris – Affords protection to the gum tissue – Offer support and anchorage to one another
  10. 10. Dr. Rooban Thavarajah Inter proximal Spaces Triangular-shaped spaces between teeth, formed by the bone on one side and the proximal surfaces and their contact area on the other side. – Normally filled with gingival tissue • Papillary gingiva • Inter dental papilla
  11. 11. Dr. Rooban Thavarajah Embrasures • Open space • Spillways • Named for their location – Names: • Facial (buccal or labial) • Lingual • Incisal or occlusal • Gingival/Cervical (if inter proximal space not occupied by tissue or bone)
  12. 12. Dr. Rooban Thavarajah Embrasures Function – Allow food to be forced away from contact areas – Reduce the forces of occlusal forces – Self-cleansing – Permit a slight amount of stimulation to the gingiva
  13. 13. Dr. Rooban Thavarajah Facial view Contact areas • Anterior teeth – Contact areas: close incisal third – Except Distal of Canine -middle third • Occlusal / Incisal view Contact areas – Anterior teeth • Contact areas in the center from a facial to lingual direction
  14. 14. Dr. Rooban Thavarajah Posterior teeth • Contacts: more facially • Middle to Cervical third • Slightly buccal to the center • Lingual embrasure usually larger
  15. 15. Dr. Rooban Thavarajah Height of contour • Imaginary curved line encircling a tooth at its greatest bulge • Afford correct amount of frictional massage to gingiva • Cleansing mechanism • General rule: – Contour will vary from tooth to tooth – Height of contour for both anterior and posterior teeth is in the cervical third – Except lingual crest of curvature of posterior teeth which is near the middle third
  16. 16. END OF UNIT Dr. Rooban Thavarajah