Maxillary Landmark PDF

 ANATOMY IN RELATION TO COMPLETE DENTURE  Anatomical landmarks Maxillary Mandibular Extraoral land marks Limiting structures Supporting structures Relief Areas  LIMITING STRUCTURES They determine and c...

 ANATOMY IN RELATION TO COMPLETE DENTURE  Anatomical landmarks Maxillary Mandibular Extraoral land marks Limiting structures Supporting structures Relief Areas  LIMITING STRUCTURES They determine and confine the extent of the denture Labial frenum Labial vestibule Buccal frenum Buccal vestibule Hamular notch Posterior palatal seal area(vibrating line) Fovea palatina. LABIAL FRENUM Fold of mucous membrane No muscle No action of its own The frenum may be single or multiple, narrow, or broad LABIAL FRENUM  Notch should be recorded during impression making labial notch of the labial flange of the denture must be just wide enough and just deep enough to accommodate the labial frenum  BUCCAL FRENUM -A fold or folds of mucous membrane varies in size and shapes. -It extends from the buccal mucous membrane reflection area toward the slope or crest of the residual alveolar ridge. -It is the dividing line between labial and buccal vestibule.  BUCCAL FRENUM Levetor anguli oris muscle attaches beneath the frenum. It produces the maxillary buccal notch in the maxillary impression or denture which must be broad enough because of the movement of the frenum which is affected by some of the facial muscles as the orbicularis muscle pull it forward while buccinator muscle pull it backward.  BUCCAL FRENUM It produces the maxillary buccal notch in the maxillary impression or denture which must be broad enough because of the movement of the frenum which is affected by some of the facial muscles as the orbicularis muscle pull it forward while buccinator muscle pull it backward. The buccal notch is wide and V-shaped While the labial notch is long and narrow  LABIAL VESTIBULE -It extends on both sides of the labial frenum to the buccal frenum, bounded by the upper lip and residual alveolar ridge. -It is divided into left and right by the labial frenum.  LABIAL VESTIBULE Orbicularis oris is the main muscle which forms the outer surface of the labial vestibule.  LABIAL VESTIBULE -The reflection of the mucous membrane superiorly determines the height of the vestibule. -In the denture the area that fills this space is known as labial flange.  BUCCAL VESTIBULE Extend from buccal frenum to hamular notch Bounded laterally by the cheeks and medially by the ridge. The area of the denture which will fill this space is known as buccal flange.  BUCCAL VESTIBULE Size of the vestibule varies with the contraction of buccinator muscle, position of the mandible( coronoid process), and amount of bone lost from maxilla.  BUCCAL VESTIBULE The stability and retention of a denture are greater enhanced if the vestibular space properly filled with the flange distally.  HAMULAR OR PTERYGO-MAXILLARY NOTCH Depression distal to max. tuberosity The posterior palatal border of the denture should extend through the Hamular notch  Hamular notch Distal limit of the buccal vestibule. It is a narrow cleft of loose connective tissue situated between the maxillary tuberosity and the pterygoid hamulus (approximately 2mm antero-posteriorly) Also known as pterygomaxillary notch.  Hamular notch Tensor veli palatini muscle runs horizontally through this notch. Aids in achieving posterior palatal seal.  Vibrating line/area of the soft palate -The imaginary line across the posterior part of the palate making the division between the movable and immovable tissues of the soft palate which can be identified when the movable tissues are moving” “ -It is not well defined as a line; therefore, it is better to describe it as an area rather than a line.  Vibrating line/area of the soft palate The direction of the line varies according to the shape of the palate in “ the denture.  Vibrating line/area of the soft palate The posterior border of the denture known as posterior palatal seal area on which pressure within the physiological “ limits of the tissues can be applied by a denture to aid in the retention of the denture.  FOVEA PALATINAE These are two indentations on each side of the midline just posterior to the junction of the hard palate and soft palate. They are formed by a coalescence of several mucous gland ducts (minor salivary glands) Palatal posterior border should be few mm posterior to it