INBDE (Integrated National Board Dental Examination) Practice Exam

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Which device is placed on the hinge axis of the mandible?

Facebow
Arcon
Kinematic
Nonarcon

The correct answer is: Kinematic

The correct answer is C. Kinematic. In dentistry, the device placed on the hinge axis of the mandible is called a kinematic facebow. A facebow is a device used in prosthodontics to record the spatial relationship of the maxillary arch to the temporomandibular joints. It helps in transferring the orientation of the upper cast to the articulator, allowing for accurate mounting of casts in articulators. The kinematic facebow is especially important in cases where precise occlusal relationships need to be maintained, such as in full mouth rehabilitation or complex prosthodontic cases. Options A, B, and D are incorrect: A. Facebow - While a facebow is used in dentistry, it is not specifically placed on the hinge axis of the mandible. It is used to record the spatial relationship of the maxillary arch to the temporomandibular joints. B. Arcon - Arcon and Nonarcon are terms related to articulator design and are not directly placed on the hinge axis of the mandible. D. Nonarcon - Similar to option B, Nonarcon is also related to articulator design and is not placed on the hinge axis of the mandible.