|What Is a Checkbite Impression?|
GP developed a metal tray which encompassed ¾ of the arch so both cuspids could be included in the impression allowing the laboratory, after articulation, to simulate mastication by going into the various excursions as well as cuspid rise.
Using ¾’s of the arch minimized gagging associated with full arch trays particularly when the material had a longer setting time and involved many more teeth in the arch which allowed the laboratory to esthetically evaluate the case as well as more realistically simulate occlusion and mastication.
One consideration when taking any bite registration whether using full arch or checkbite is to take a bite registration prior to any anesthetic, as a double check. The rationale for this is that once a patient is anesthetized and you ask them to close, the bite can be unintentionally affected because of the anesthesia. Usually the patient will place more pressure on one side or the other. Twenty five years ago before the paste bite materials were developed, wax and acrylic were used and distortion was common place. Today, it takes only a few minutes to get an accurate registration prior to anesthesia and it gives the laboratory a double check on the bite.
It used to be said that only full arch impressions could produce optimum results but this is not necessarily true. There are occlusal discrepancies in most people and although they are usually asymptomatic, they can come into play when trying to articulate models and simulate occlusion.
Using the ¾ Arch Tray gives the laboratory more teeth than quadrant trays, less than full arch but minimizes gagging, utilizes less material and time and produces an excellent end product.
GP added a quadrant try and an anterior tray creating a series of trays that accommodate the checkbite or functional impression for all Crown and Bridge applications.