02. Anatomy Tour.ppt


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02. Anatomy Tour.ppt

  1. 1. Anatomy for Complete and Partial Dentures
  2. 2. Lips <ul><li>Vermilion Border </li></ul><ul><ul><li>Denture provides lip support </li></ul></ul><ul><ul><ul><li>Affects vermilion border width </li></ul></ul></ul>
  3. 3. Lips <ul><li>Philtrum </li></ul><ul><ul><li>Depression below nose </li></ul></ul>
  4. 4. Lips <ul><li>Nasolabial Angle </li></ul><ul><ul><li>Angle between columella of nose & philtrum of lip </li></ul></ul><ul><ul><li>Normally, approximately 90° as viewed in profile </li></ul></ul>
  5. 5. Lips <ul><li>Tissue of the Upper Lip </li></ul><ul><ul><li>Loose tissue of the upper lip can be gathered between your thumb and index finger </li></ul></ul>
  6. 6. Cheeks <ul><li>Masseter Muscle </li></ul><ul><ul><li>Closing muscle bulges into distal corner of buccal vestibule </li></ul></ul><ul><ul><li>Not active during impression making </li></ul></ul>
  7. 7. Residual Ridges <ul><li>If ridges are severely resorbed, inform patient </li></ul><ul><ul><li>“ U”-shape </li></ul></ul><ul><ul><li>“ V”-shape </li></ul></ul>
  8. 8. Vestibules <ul><li>If vestibules are shallow, inform the patient </li></ul>
  9. 9. Maxilla <ul><li>Maxillary Tuberosities </li></ul><ul><ul><li>Oversized </li></ul></ul><ul><ul><li>Resorbed </li></ul></ul><ul><ul><li>Undercut </li></ul></ul>
  10. 10. Maxilla <ul><li>Maxillary Tuberosities </li></ul><ul><ul><li>Oversized </li></ul></ul><ul><ul><li>Resorbed </li></ul></ul><ul><ul><li>Undercut </li></ul></ul>
  11. 11. Maxilla <ul><li>Incisive Papilla </li></ul><ul><ul><li>Landmark for setting of teeth </li></ul></ul>
  12. 12. Maxilla <ul><li>“ Hamular” Notch </li></ul><ul><ul><li>Posterior border denture </li></ul></ul><ul><ul><ul><li>Between the bony tuberosity and hamulus </li></ul></ul></ul><ul><ul><ul><li>“ Soft displaceable tissue”, for comfort and retention </li></ul></ul></ul>
  13. 13. Maxilla <ul><li>“ Hamular” Notch </li></ul><ul><ul><li>Posterior border denture </li></ul></ul><ul><ul><ul><li>Sometimes posterior to where the depression in the soft tissue appears </li></ul></ul></ul><ul><ul><ul><li>Use the head of your mirror to palpate the notch & mark with an indelible marker </li></ul></ul></ul>
  14. 14. Maxilla <ul><li>Soft Palate </li></ul><ul><ul><li>Vibrating Line </li></ul></ul><ul><ul><ul><li>Critical posterior border dentures </li></ul></ul></ul><ul><ul><ul><li>Junction of movable and immovable portions of the soft palate </li></ul></ul></ul>
  15. 15. Maxilla <ul><li>Glandular Tissue </li></ul><ul><ul><li>Soft displaceable </li></ul></ul>
  16. 16. Maxilla <ul><li>Soft Palate </li></ul><ul><ul><li>Fovea Palatine </li></ul></ul><ul><ul><ul><li>Bilateral indentations near midline of the soft palate </li></ul></ul></ul><ul><ul><ul><li>Close to the vibrating line </li></ul></ul></ul>
  17. 17. Maxilla <ul><li>Hard Palate </li></ul><ul><ul><li>Median Palatine Raphe (midline palatine suture) </li></ul></ul><ul><ul><ul><li>A bony midline structure </li></ul></ul></ul><ul><ul><ul><li>May require relief when covered by a denture </li></ul></ul></ul>
  18. 18. Maxilla <ul><li>Torus Palatinus </li></ul><ul><ul><li>May require removal </li></ul></ul>
  19. 19. Mandible <ul><li>Pear Shaped Pad </li></ul><ul><ul><li>Soft pad containing glandular tissue </li></ul></ul><ul><ul><li>Inverted pear shape, posterior border </li></ul></ul><ul><ul><li>Created from scarring after extractions </li></ul></ul>
  20. 20. Mandible <ul><li>Buccal Shelf </li></ul><ul><ul><li>Primary denture bearing area of mandibular denture </li></ul></ul><ul><ul><li>Between height of bridge & external oblique ridge </li></ul></ul><ul><ul><li>Resorbs more slowly </li></ul></ul>
  21. 21. Mandible <ul><li>Anterior Border of the Ramus </li></ul><ul><ul><li>Do not extend dentures to ramus </li></ul></ul><ul><ul><li>Discomfort will result </li></ul></ul>
  22. 22. Mandible <ul><li>External Oblique Ridge </li></ul><ul><ul><li>Do not extend dentures to this ridge </li></ul></ul>
  23. 23. Mandible <ul><li>Mylohyoid Ridge </li></ul><ul><ul><li>Origin of mylohyoid muscle which influences length of lingual flange </li></ul></ul><ul><ul><li>Can be prominent, and/or sharp, requiring relief </li></ul></ul>
  24. 24. Mandible <ul><li>Mylohyoid Ridge </li></ul>
  25. 25. Mandible <ul><li>Lingual Tori </li></ul><ul><ul><li>Raised bony structures </li></ul></ul><ul><ul><li>May require relief when covered by a denture </li></ul></ul><ul><ul><li>Thin mucosa can ulcerate easily </li></ul></ul>
  26. 26. Mandible <ul><li>Genial Tubercles </li></ul><ul><ul><li>Attachment for the genioglossus muscle </li></ul></ul><ul><ul><li>Tubercles may be higher than the ridge with severe resorption </li></ul></ul>
  27. 27. Frena (singular = frenum) <ul><li>Must be relieved to allow movement, without impingement </li></ul><ul><li>If prominent, adequate relief can weaken a denture </li></ul><ul><li>If too much relief, retention is lost </li></ul><ul><li>Check prominence intraorally </li></ul>
  28. 28. Pterygo-Mandibular Raphe <ul><li>Connects from the hamulus to the mylohyoid ridge </li></ul><ul><li>When prominent, can cause pain, or loosening </li></ul><ul><li>Requires relief “groove ” if prominent </li></ul>
  29. 29. Retrozygomal Fossae (Space) <ul><li>Palpate zygomatic process in buccal vestibule just buccal to first maxillary molar </li></ul><ul><li>Vestibular space posterior to zygoma </li></ul>
  30. 30. Retrozygomal Fossae (Space) <ul><li>Commonly incompletely captured in preliminary impressions </li></ul><ul><li>Use syringe technique </li></ul>
  31. 31. Coronoid Process <ul><li>Place mirror head lateral to tuberosity </li></ul><ul><li>Move mandible to opposite side </li></ul><ul><li>Note binding or pain </li></ul><ul><li>This gives some indication of the width of the space for flange </li></ul>