Please do not consider them as a substitute for qualified healthcare provider advice, diagnosis or treatment. Remember in real life though peoples labioincisal edge of tooth is 5-7mm (and the 5-7 is where anterior teeth should be arranged)Why is a bead placed in the post-palatal seal area?The postpalatal seal area is the soft tissue area at or beyond the junction of the hard and soft palates onWhere is the post-palatal seal placed and what are the dimensions?Lateral borders at the pterygomaxillary notches and vibrating line is the posterior border. The objectives of surveying the master cast are as follows: Therefore, less water can be used to mix Type IV, and the dry strengths of Type IV are generally greater than those of Type III dental stones.Master impressions are boxed to preserve the border contours of the master impression, control the size and shape of the base of the master cast, produce a dense master cast by vibrating minimum expansion dental stone into the boxed master impression, and to conserve denture stone.What are the two most common methods of boxing edentulous master impressions?Mixing the dental stone in a vacuum spatulator under reduced atmospheric pressure produces a mix that is smooth and free of air bubbles, and an edentulous master cast that is strong and denseMaster casts: positive replicas of the maxillary & mandibular ridges along with the surrounding anatomic structures.Where is excess impression material trimmed on the master impression?How high should the heels of a mandibular impression be above the benchtop?What should the ratio of the plaster and pumice mixture be to each other?Where should the dimensions of the plaster and pumice patty initially rest?Why is an equal amount of plaster and pumice added?Once you begin trimming the plaster and pumice base what are the final dimensions?Should the posterior border of the plaster and pumice base be straight or curved?How high should the boxing wax be above the highest point on the impression?15mm above highest point. Several methods have been used and this program illustrates several of them including the pumice-plaster method and the beading boxing wax method.

During this time, the shade of the teeth is also recorded to provide a natural-looking smile.Usually, all of these procedures are performed in five to six dental visits. We do this in order to ensure the base of the cast in its thinnest areas is at least 13-15mmAdd ____ ml of H20 to ____ gm of microstone in a vacuum mixing bowl.How long do you handmix and vacuum mix the microstone for respectively?How do you retrieve the master cast from the plaster pumice base?What are some difficulties in separating master impressions from master casts?Inadequate Heating of Impression Materials (140° F Water for 3 Minutes)Which area of an edentulous master cast should be trimmed first, the sides or the base? Lubricate a small area of the base of the mandibular cast with Vaseline. If there is any question as to the placement of this bead, it should be placed so that there will be a greater amount of the border showing. This is part of the Open.Michigan collection at: It is placed at the greatest height of contour on the outside border of the denture. Should be 1-2mm deep and 2-6mm wide.What is the principal constituent of both dental plasters and dental stones?The principal constituent of both dental plasters and dental stones is calcium sulfate hemihydrate.Dental stone is the alpha-form: (alpha the one we use)What is the basis for the classification system used in the American Dental Association specification for dental gypsum products?Based on particle shape and compactness (SHAPE AND COMPACTNESS NOT SIZE AND SHAPE)Type III and IV differ in that Type IV has more compact and smoother particles, resulting in a lower surface area.

Mixing the dental stone in a vacuum spatulator under reduced atmospheric pressure produces a mix that is smooth and free of air bubbles, and an edentulous master cast that is strong and dense What is a master cast? Right click on the image below and then select "Save image as" option to save the image for your powerpoint presentations. Complete Dentures. As compared to conventional acrylic… What is Cast Partial Denture? But You still need to wear some a tampon or a menstrual cup to avoid getting into a sticky situation. Dentures are also useful for enhancing the smile of a patient.While this procedure may be the oldest, there have been many innovations and advancements in the fabrication of removable dentures.

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