|What Is a Checkbite Impression?|
Over the years, impressions for Crown and Bridgework were usually taken with full arch impression trays. The working arch being taken with one material and the opposing arch with another. A bite registration was also done with another material such as wax, paste or even acrylic. After the impressions were poured up by the laboratory and appropriately prepared, they were articulated using the bite registration.
In the early eighties, there were only a few checkbite trays which were available and were based on the premise that you could take both the upper and the lower impressions and the bite registration all in one. These trays were metal and bulky as well as short in their span in terms of the number of teeth that could be included in the impression. The bulk prevented the patient in many cases from being able to comfortably close . The shortness of the span limited their use to primarily single crowns.
Coe had two checkbite trays namely a water-cooled for hydrocolloid and a non water-cooled for other materials. These Coe Trays incorporated a paper insert which was waxed into position. Temrex had a less bulky metal tray which incorporated a slide in insert to separate the upper from the lower materials. None of the trays were more than quadrant in nature.
A Checkbite Impression, also referred to as a Dual Arch or Functional Impression, is one in which the impression material is loaded on both sides of a Checkbite Tray with a paper-like material between to separate the upper and lower and placed into the patients mouth and the patient is asked to close into a comfortable position or their normal closed position. When the material has set, the tray is removed giving both arches and the closed position all in one. There is less material used, less time required and the relationship of upper to lower is the patients normal closed position.