anatomy for complete and partial dentures l.
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Anatomy for Complete and Partial Dentures - PowerPoint PPT Presentation


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Anatomy for Complete and Partial Dentures. Lips. Vermilion Border Denture provides lip support Affects vermilion border width. Lips. Philtrum Depression below nose. Lips. Nasolabial Angle Angle between columella of nose & philtrum of lip

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Presentation Transcript
slide2
Lips
  • Vermilion Border
    • Denture provides lip support
      • Affects vermilion border width
slide3
Lips
  • Philtrum
    • Depression below nose
slide4
Lips
  • Nasolabial Angle
    • Angle between columella of nose & philtrum of lip
    • Normally, approximately 90° as viewed in profile
slide5
Lips
  • Tissue of the Upper Lip
    • Loose tissue of the upper lip can be gathered between your thumb and index finger
cheeks
Cheeks
  • Masseter Muscle
    • Closing muscle bulges into distal corner of buccal vestibule
    • Not active during impression making
residual ridges
Residual Ridges
  • If ridges are severely resorbed, inform patient
    • “U”-shape
    • “V”-shape
vestibules
Vestibules
  • If vestibules are shallow, inform the patient
maxilla
Maxilla
  • Maxillary Tuberosities
    • Oversized
    • Resorbed
    • Undercut
maxilla10
Maxilla
  • Maxillary Tuberosities
    • Oversized
    • Resorbed
    • Undercut
maxilla11
Maxilla
  • Incisive Papilla
    • Landmark for setting of teeth
maxilla12
Maxilla
  • “Hamular” Notch
    • Posterior border denture
      • Between the bony tuberosity and hamulus
      • “Soft displaceable tissue”, for comfort and retention
maxilla13
Maxilla
  • “Hamular” Notch
    • Posterior border denture
      • Sometimes posterior to where the depression in the soft tissue appears
      • Use the head of your mirror to palpate the notch & mark with an indelible marker
maxilla14
Maxilla
  • Soft Palate
    • Vibrating Line
      • Critical posterior border dentures
      • Junction of movable and immovable portions of the soft palate
maxilla15
Maxilla
  • Glandular Tissue
    • Soft displaceable
maxilla16
Maxilla
  • Soft Palate
    • Fovea Palatine
      • Bilateral indentations near midline of the soft palate
      • Close to the vibrating line
maxilla17
Maxilla
  • Hard Palate
    • Median Palatine Raphe (midline palatine suture)
      • A bony midline structure
      • May require relief when covered by a denture
maxilla18
Maxilla
  • Torus Palatinus
    • May require removal
mandible
Mandible
  • Pear Shaped Pad
    • Soft pad containing glandular tissue
    • Inverted pear shape, posterior border
    • Created from scarring after extractions
mandible20
Mandible
  • Buccal Shelf
    • Primary denture bearing area of mandibular denture
    • Between height of bridge & external oblique ridge
    • Resorbs more slowly
mandible21
Mandible
  • Anterior Border of the Ramus
    • Do not extend dentures to ramus
    • Discomfort will result
mandible22
Mandible
  • External Oblique Ridge
    • Do not extend dentures to this ridge
mandible23
Mandible
  • Mylohyoid Ridge
    • Origin of mylohyoid muscle which influences length of lingual flange
    • Can be prominent, and/or sharp, requiring relief
mandible24
Mandible
  • Mylohyoid Ridge
mandible25
Mandible
  • Lingual Tori
    • Raised bony structures
    • May require relief when covered by a denture
    • Thin mucosa can ulcerate easily
mandible26
Mandible
  • Genial Tubercles
    • Attachment for the genioglossus muscle
    • Tubercles may be higher than the ridge with severe resorption
frena singular frenum
Frena (singular = frenum)
  • Must be relieved to allow movement, without impingement
  • If prominent, adequate relief can weaken a denture
  • If too much relief, retention is lost
  • Check prominence intraorally
pterygo mandibular raphe
Pterygo-Mandibular Raphe
  • Connects from the hamulus to the mylohyoid ridge
  • When prominent, can cause pain, or loosening
  • Requires relief “groove ” if prominent
retrozygomal fossae space
Retrozygomal Fossae (Space)
  • Palpate zygomatic process in buccal vestibule just buccal to first maxillary molar
  • Vestibular space posterior to zygoma
retrozygomal fossae space30
Retrozygomal Fossae (Space)
  • Commonly incompletely captured in preliminary impressions
  • Use syringe technique
coronoid process
Coronoid Process
  • Place mirror head lateral to tuberosity
  • Move mandible to opposite side
  • Note binding or pain
  • This gives some indication of the width of the space for flange