The George Gauge is a dental bite registration instrument used to record the mandibular protrusive position and vertical opening during fabrication of oral appliances such as sleep apnea devices, TMJ splints, and orthodontic functional appliances. It allows clinicians to obtain accurate and repeatable jaw positioning measurements chairside. (greatlakedentaltech.com)

The system is widely used in sleep dentistry and prosthetic/orthodontic treatment planning because it helps standardize mandibular advancement while improving patient comfort and appliance accuracy.