Anatomical Landmarks In Maxilla 6t173n

Anatomical landmarks in maxilla Limiting structures Labial frenum Single band of fibrous connective tissue, must be properly relieved. Labial vestibule Extends from labial frenum to buccal frenum. Proper lip should be provided. Buccal frenum Consist of one or more bands. Must be Relieved Influenced by 3 muscles- Orbicularis oris (forward), Buccinator (backward), Caninus (position) Buccal vestibule Buccal frenum to hamular notch Influenced by Buccinator, Modiolus, Coronid process of mandible Hamular notch Pterygomaxillary notch, Distal extension of denture ,Situated between the tuberosity and hamulus of the medial pterygoid plate. Posterior palatal seal area the soft tissues along the junction of the hard and soft palates on which pressure within the physiologic limits of the tissues can be applied by a denture to aid in the retention of the denture. Synonyms: post dam area, postpalatal seal area

ing structures Hard palate Flat areas as secondary retentive areas. Flat palate (not good ), V shaped palate (least favorable). Residual ridge Ridge left after the extraction of teeth. Mucosa is firmly attached to the periosteum of the bone. Consist of dense collagenous fibers. Considered as a secondary stress-bearing area because it is subject to resorption contrary to horizontal portion of hard palate. Palatal rugae Resist the horizontal forces against the denture, Should not be over compressed.

Relief areas Incisive papilla Pad of fiberous connective tissue over incisive foramen, Proper relief should be given. Aid in arrangement of anterior teeth and jaw relation.

Mid palatine raphe Junction of palatine process of maxilla. Covered by a thin mucosa, Slightly elevated or raised. Proper relief required. Fovea palatine Formed by coalescence of several mucous gland ducts. Landmark for location of vibrating line.

Maxillary Tuberosity The medial & lateral walls resist the horizontal and torquing forces which would move the denture base in lateral or palatal direction. Therefore, maxillary denture base should cover the tuberosities and fill the hamular notches.