Provide a 2- to 3-mm depth of alginate beyond the occlusal surface and incisal edge.ĥ. Extend distally approximately 2 to 3 mm beyond the last tooth in the arch to include the retromolar area.ģ. Extend facially to include all teeth as well as the musculature and vestibule.Ģ. The empty tray should be seated in the patient’s mouth to determine the correct fit. If tori/exostosis is present, a wider or larger tray will be necessary for patient comfort. Proper Tray Selectionīefore taking the impression, one should conduct an oral exam to assess the maxillary and mandibular arch for its width, length, or presence of mandibular tori or maxillary exostosis (harmless overgrowth of bone). Disposable (or single-use) trays are usually made of plastic, and autoclavable (permanent) trays are made of stainless steel. Impression trays are available in a variety of sizes and materials. These perforations act as a retentive mechanism to keep the set alginate from separating from the tray upon removal. Impression trays are usually perforated so that the alginate will flow through the holes when the tray is seated on the dental arch. Study models constructed from alginate impressions can be used for planning patient treatment and can serve as part of the patient’s permanent record. The purpose of taking an alginate impression is to make an accurate reproduction of the maxillary and mandibular arches and adjacent tissues. Taking (or making) alginate impressions is a procedure that is included in the scope of practice in most states for both dental hygienists and dental assistants. In addition, diagnostic study models are useful as pretreatment and posttreatment records for patients who undergo extensive restorative or orthodontic treatment, fabrication of vital bleach trays, and bruxism splints. They are important visual aids in diagnosis and treatment planning for a patient, and they also serve as an important part of the patient’s permanent record. Study models or study casts are positive reproductions of the patient’s dental arches and surrounding tissues. It also adequately records details of the patient’s oral structures. It is pleasant tasting, inexpensive, and easy to manipulate. Use of alginate impression material is the most common method for obtaining diagnostic casts.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |