![]() While multiple tooth restorations (quadrants) and anterior tooth dual arch impressions are also common, McCracken surveyed 1,700 dentists and found that polyvinyl siloxane is the most common impression material utilized (77%). The most common use for this technique is for single-unit posterior restorations. Glidwell Lab reported in 2016 that 85% of the restorative impressions received were triple-tray impressions. The use of the triple-tray impression technique is widespread. The impression is then poured and mounted on an “articulator.” The final restoration is fabricated from these triple-tray obtained models. The patient is instructed to “bite down” or put their teeth together until the material is set. The tooth is prepared and then the tray is loaded with the impression material. The patient closes into a plastic or metal tray that has a mesh separating the opposing dentition. It simultaneously records the occlusal relationship of the opposing segments. This impression technique involved the use of a special tray that registers the impression of the opposing segments of the dentition. In 1983, Wilson and Werrin first described the dual arch impression technique, which is also known as the double arch impression technique or the “triple-tray” technique. Is the dental laboratory doing something wrong? Can you help me figure it out or give me some insight?” I am using a triple-tray with polyvinyl siloxane. Bonk, I am frustrated and having difficulty getting my crowns to fit consistently. ![]() I was recently confronted with these questions and concerns: As an advisor in the General Practice Residency Program at Loyola Hospital in Chicago and member of Spear Resident Faculty, I receive questions from students and participants regarding various techniques and processes related to restorative dentistry.
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