Plasdent - Block-4-Bite #7020 Disposable Bite Blocks for Panoramic X-Ray Machines, Fits **Discontinued see PLA-BB-020(7020)For accurate and precise x ray sensor positioning No sharp edges for patient comfort Durable plastic construction Available in various forms for different applications Bite Blocks are used to ensure proper placement and orientation of the x ray sensor in the patient's mouth to avoid image distortions and improper focus. They are available in various forms, designed depending on the areas of the mouth that needs to be examined.