Anatomical landmarks in edentulous jaws Department of Prosthodontics

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Anatomical landmarks in edentulous jaws Department of Prosthodontics Dentistry Explorer

Anatomical landmarks in edentulous jaws Department of Prosthodontics Dentistry Explorer

Anatomic landmarks in the maxilla • Limiting structure Labial frenum Labial vestibule Buccal frenum

Anatomic landmarks in the maxilla • Limiting structure Labial frenum Labial vestibule Buccal frenum Buccal vestibule Hamular notch Posterior palatal seal area Dentistry Explorer

 • Supporting structures Primary stress bearing areas; hard palate posterior residual ridge Secondary

• Supporting structures Primary stress bearing areas; hard palate posterior residual ridge Secondary stress bearing area: Rugae Maxillary tuberosity • Relief areas Incisive papilla Cuspid eminence Mid palatine raphe, Fovea palatinae Dentistry Explorer

Anatomic landmarks in the mandible • Limiting structure Labial frenum Labial vestibule Buccal frenum

Anatomic landmarks in the mandible • Limiting structure Labial frenum Labial vestibule Buccal frenum Buccal vestibule Lingual frenum Alveololingual sulcus Retromolar pads Pterygomandibular raphe Dentistry Explorer

 • Supporting structure Buccal shelf area Residual alveolar ridge • Relief areas Crest

• Supporting structure Buccal shelf area Residual alveolar ridge • Relief areas Crest of the residual alveolar ridge Mylohyoid ridge Mental foramen Genial tubercles Torus mandibularis Dentistry Explorer

Oral mucous Foundation for dentures-membrane bone covered by mucous membrane Cushion between the denture

Oral mucous Foundation for dentures-membrane bone covered by mucous membrane Cushion between the denture base and the supporting bone Composed of mucosa and sub mucosa Mucosa is formed by stratified keratinized squamous epithelium Mucosa covering hard palate & the crest of residual ridge , including residual attached gingiva , is classified as masticatory mucosa. Dentistry Explorer

 • When submucosa is thin ---soft tissue will be nonresilent --- mucosa easily

• When submucosa is thin ---soft tissue will be nonresilent --- mucosa easily traumatized • When submucosa is excessively thick - the tissue is displaceable & the stability & support are lessened. Dentistry Explorer

“Adaptation to function” and “variation in response to stimuli”. Anterolaterally – adipose tissue Posterolaterally

“Adaptation to function” and “variation in response to stimuli”. Anterolaterally – adipose tissue Posterolaterally – glandular tissue Dentistry Explorer

 • Mid-palatal suture – Extremely thin submucosa, – Causes ulcers due to excess

• Mid-palatal suture – Extremely thin submucosa, – Causes ulcers due to excess pressure – Denture may rock – Midline fracture can occur So, it should be relieved. • Rugae – Raised are of dense connective tissue – Located at the anterior 1/3 of the palate. – Resists anterior displacement of the denture hence is a secondary support area. Dentistry Explorer

 • Residual alveolar ridge – Covered by a firm mucosa, thick layer of

• Residual alveolar ridge – Covered by a firm mucosa, thick layer of inelastic dense connective tissue, immovably attached to the periosteum. – Submucosa is characterised by dense collagenous fibers provide adequate resiliency to support the denture. – With continuous resorption its potential for support is limited and thus act as secondary stress bearing area. Dentistry Explorer

 • The mucous membrane that comes into contact with the denture borders is

• The mucous membrane that comes into contact with the denture borders is usually lining mucosa. • In the vestibular fornix and in the sublingual sulcus, the mucous membrane is loosely attached to the deeper structures. • These areas easily displaced and act as excellent areas to create a seal for the denture borders. Dentistry Explorer

The posterior palatal seal is placed in oral mucosa of soft palate which is

The posterior palatal seal is placed in oral mucosa of soft palate which is resilient. Mucous membane – nonkeratinized epithelium with numerous mucous gland in submucosa Dentistry Explorer

External oblique line – lateral termination of the buccal flange of the mandibular denture.

External oblique line – lateral termination of the buccal flange of the mandibular denture. The buccal shelf area – primary stress bearing area. The lingual flange of the mandibular denture should extend lateral but not inferior to the mylohyoid line. Dentistry Explorer

Dentistry Explorer

Dentistry Explorer