![]() Pressing the spatula against the side of the bowl helps to remove air bubbles from the mixture.ĭ. Spatulate (stir) the mixture for 30 seconds with a stropping motion. Measure the correct quantity of the corresponding water, and pour it into your plaster mixing bowl. Regardless of the material, follow the manufacturer’s directions.ī. Measure 100 to 150 g of the dental stone or other gypsum depending on the size of the impression. This chapter presents two of these techniques: one using a “double-pour” and another using a “single-pour” of the impression.Ī. The armamentarium is listed in Table 28.1. Several laboratory techniques for fabricating study models are acceptable. It is also important that these skills are practiced both safely and effectively therefore, compliance with Occupational Safety and Health Administration (OSHA) guidelines is mandatory. The process of pouring an alginate impression, preparing a base for the model, separating the model from the impression, and trimming the model, is described in the following pages. The purpose of this chapter is to apply previously learned information and acquire the necessary skills to prepare esthetically pleasing and useful study models. The procedural steps for these techniques are detailed in this chapter. The ability to self-critique to make adjustments or repeat the step is critical for obtaining satisfactory results. If a flaw is present in step one, that flaw will be reproduced throughout the entire procedure and be present in the final product. Therefore, do not be discouraged if your first attempt is not exact.ĭuring any process, each step is important to the quality of the final outcome. As with all skills, however, “practice makes perfect.” Most people must continue to practice to be consistently competent. These procedures are commonly performed in the practice of dentistry to gather information concerning the patient’s dentition and to establish an accurate diagnosis. Study models ( diagnostic models or diagnostic casts) are defined as “a positive replica of the dentition and surrounding structures used as a diagnostic aid and/or base for construction of orthodontic appliances or prosthetic devices.”īecause a dental hygienist is legally permitted to perform these procedures, competency is expected in the associated knowledge and skills. The composition, properties, and uses of gypsum materials are discussed in Chapter 9, Gypsum Materials.
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