There are 2 types of facebows, ____________ and __________. The _________ is more accurate.

The correct choices are Kinematic and Arbitrary, with Kinematic being the more accurate type of facebow.

A facebow is an essential dental instrument used to record the relationship of the maxillary arch to the temporomandibular joint (TMJ). There are two primary types of facebows: kinematic and arbitrary.

The kinematic facebow, which is more accurate, is designed to use specific anatomic reference points to establish a precise relationship between the maxilla and the condylar axis of the mandible. This device can incorporate the actual hinge axis of the mandible, thus allowing for a highly accurate transfer of the maxillary relationship to an articulator. This precision enables better treatment planning and outcomes, particularly in restorative and orthodontic cases.

On the other hand, this level of accuracy is not present with arbitrary facebows, which utilize average values and estimates to position the maxilla in relation to the articulator. As a result, while they can simplify the process and be useful in certain situations, they may not provide the same level of precision as kinematic types.

Understanding these distinctions is crucial when making clinical decisions about the best facebow to use, especially when precise occlusal relations are needed.