DEVELOPING ANALOGUE/SUBTITUTE FOR THE MANDIBULAR DENTURE BEARING AREA. Dr Muhammad Rizwan Memon FCPS Assistant Professor
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1 DEVELOPING ANALOGUE/SUBTITUTE FOR THE MANDIBULAR DENTURE BEARING AREA Dr Muhammad Rizwan Memon FCPS Assistant Professor
2 Crest of Residual Ridge Buccal Shelf Shape of supporting structure Mylohyoid Ridge Mental foramen Genial tubercles Torus Mandibularis
3 Mucous membrane covering ridge is similar to that of the upper in healthy mouth. Underlying bone is cancellous, therefore, the crest of the residual ridge may be not favorable as a primary stress bearing area
4 It is bounded medially by crest of ridge, laterally by external oblique ridge, anteriorly by buccal frenum and distally by retromolar pad. Bone of the buccal shelf area is covered by a layer of cortical plate and shelf area lies at right angle to the vertical occlusal forces, makes it the most suitable primary stress bearing area.
5 The maxilla resorb upward and inward to become smaller b/c of direction & inclination of roots of teeth & alveolar process and opposite is true for mandible which become wider with age and gives patient progenathic appearance
6 Following the extraction of natural teeth and subsequent resorption, the mylohyoid ridge becomes more prominent. This can result in mucosal soreness beneath the denture bearing area over the mylohyoid ridge, unless relief is provided in denture base
7 It may become prominent with ridge resorption and produce numbness by compressing nerves & blood vessels unless relief is provided
8 With resorption of ridge genial tubercles may become prominent
9 Often found bilaterally below 1 st & 2 nd Premolar area and require surgical removal to avoid breaking of border seal
10 Labial Vestibule Buccal Vestibule Distal Extension Lingual Border Mylohyoid Muscle Retromylohyoid fossa Sublingual gland region Alveololingual sulcus
11 It runs from buccal frenum to buccal frenum on other side Length & thickness of labial flange very with amount of tissue has lost If flange is thick in this region, the denture will be displaced by stretching of Orbicularis Oris muscle when mouth is opened wide
12 Extent of Buccal vestibule is influenced by Buccinator muscle The External oblique ridge does not govern the extension of the buccal flange because the resistance or lack of encountered in this region varies widely. The buccal flange may extend to the external oblique ridge, up onto it or even over it depending on the location of the mucobuccal fold.
13 The retro molar pad is a triangular soft pad of tissue. Its mucosa is composed of thin non keratinized epithelium. Its submucosa contains Glandular tissues Fibers of the buccinator and superior constrictor muscles Pterygo mandibular raphe Fibers of the temporalis muscle Action of these muscles limit the extent of denture,& prevents placement of extra pressure on distal part of pad during impression, The anterior section is usually firm and fibrous. It is important for denture support and preventing distal denture displacement therefore the denture base should only extend to one half to two third the retro molar pad
14 Lingual tissues under the tongue exhibits less direct resistance & distorted easily when impression is being made, that will result in tissue soreness & denture dislodgement by tongue, To avoid this, action of Mylohyoid must be understood It is a thin sheet of fibers and in a relaxed state will not resist the impression material. Carrying the border under the mylohyoid cannot be tolerated. The contraction of this muscle will displace the denture. Lingual Flange must be made parallel to the mylohyoid muscle when it contracts
15 In the retro mylohyoid fossa the border of the denture move back toward the body of the mandible producing the S curve of the lingual flange. Protrusion of tongue causes retromylohyoid curtain to move forward that will determine the posterior extension of denture
16 In premolar region gland rest on Mylohyoid muscle, During raising of floor of mouth it comes close to the crest of ridge & reduce depth of sulcus This may be pushed by mucocompressive material, so final impression should be taken with low viscosity impression material
17 Examination & conditioning of pt: Selection of impression material Selection of impression tray Seating of pt: Making the preliminary impression Constructing the primary cast Fabrication of primary tray Border molding Diagnostic impression Final impression
18 Chair position for mandibular impression: Pt: jaw should be at or above the operator elbow level Operator should stand in front of the pt:
19 Tray Selection: Objective is to obtain slightly over extended impression around the borders Tray should be moistened with water before trying it in mouth so as to reduce the friction with lips and oral mucosa Sides of properly fitted tray should avoid direct contact with the buccal, labial & lingual surfaces of teeth by approximate 5mm Mandibular tray should extend to include the retromolar pads Any area of under extension of tray is corrected with boxing wax and entire border of tray is lined with boxing wax to create rim
20 Patient is asked to open mouth halfway The tray is inserted sideways into the mouth With a rotary motion it is lined up with the area to be registered, with the tray handle approximately parallel to the occlusal plane and in line with the midline Patient is instructed to lift the tongue and close his mouth slightly Tray is seated gently by alternating pressure from an index finger in 1 st molar region When the tray is seated the borders of impression are molded
21 Mandibular Impression Making with Alginate
22 Constructing Custom Tray A wax spacer 1mm thick is placed over crest & slopes of residual ridges except borders and buccal shelf area so tray contacts in this region for selective pressure and positioning of tray One anterior handle is placed to carry tray in mouth and two posterior handles are used as finger rest for placement & stabilization of tray in correct position
23 Two ways; 1. In one step (Reduce no of insertion of tray and chances of errors created in one step affect another contour) 2. Segment by segment
24 Border Molding with one step technique
25 Flanges of custom tray should be reduced 2mm short of reflections to create space for border molding material Wax spacer is left inside the tray for proper positioning The mandibular impressions are made in eight segments.
26 To confirm the correct recording of the periphery Apply petroleum jelly Mix and apply ZoE paste on the borders and perform all the movements as for initial periphery record Look for over and under extensions
27 0.5 mm of border molding material is removed to create space for final impression material Spacer wax if present is removed from inside the tray
28 Mix material in proper ratio and paint a thin layer on whole surface of tray including the periphery Seat first anterior then posterior After one minute border mold (first anterior then posterior) Ask the patient to perform the tongue movements Remove after 3-4 minutes
29 Boxing impression and Making Cast
30
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