NDAEB review 5.2.2 Obtains preliminary impressions for study models 2024

NDAEB review 5.2.2 Obtains preliminary impressions for study models 2024 State the rational for obtaining preliminary impressions and bite registrations for the fabrications of study models - correct answer they are a valuable diagnostic tool. The dentist can use these models to study the patient's mouth from angles that are impossible to reach during the clinical examination. an accurate registration of the normal centric relationship of the maxillary and mandibular arches An acceptable alginate impression must meet specific criteria as follows - correct answer •should be centered over the central and lateral incisors. •complete "peripheral roll," which includes all the vestibular areas. -not overseated (pushed down too far), exposure of areas of the impression tray. - free from tears or voids (holes). •Sharp anatomical detail of all teeth and soft tissues is provided. •The retromolar area, lingual frenum, tongue space, and mylohyoid ridge are reproduced in the mandibular impression. •The hard palate and tuberosities are recorded in the maxillary impression. Select and prepare armamentarium specific to the clients dentition and anatomy - correct answer ? Look in patients mouth to determine if there are any sore spots or tori select the proper size of tray •Is comfortable for the patient •Extends slightly beyond the facial surfaces of the teeth •Extends approximately 2 to 3 mm beyond the third molar, retromolar, or tuberosity area of the arch •Is sufficiently deep to allow 2 to 3 mm of material between the tray and the incisal or occlusal edges of the teeth Manipulate Preliminary impression material equipment and procedural steps - correct answer Alginate Powder measure Water measure Medium-sized rubber bowl Beavertail-shaped wide-blade spatula 1 Place the appropriate amount of water into the bowl. 2 Shake the can of alginate to "fluff" the contents. After fluffing, carefully lift off the lid to prevent the particles from flying into the air. 3 Sift the powder into the water and use the spatula to mix with a stirring action to wet the powder until all has been moistened. 4 Firmly spread the alginate between the spatula and the side of the rubber bowl. 5 Mix with the spatula for the appropriate length of time. The mixture should appear smooth and creamy. 6Wipe the alginate mix into one mass on the inside edge of the bowl. obtain Mandibular preliminary impressions= materials and equipment - correct answer Alginate powder Alginate measure scoop (provided by the manufacturer) Water measure (provided by the manufacturer) Room temperature water Rubber bowl Wide-blade spatula Sterile impression trays Tray adhesive (used on nonperforated trays) Utility wax (if tray must be extended) Saliva ejector Precaution (biohazard) bag obtain Mandibular preliminary impressions= Preparation - correct answer 1 Gather all necessary supplies. 2 Seat and prepare the patient. 3 Explain the procedure to the patient.