Face bow

from Wikipedia, the free encyclopedia

The face bow (syn: transfer bow) is a device that enables parameters measured individually on the patient to be transferred to the articulator . It is used to determine the position of the upper jaw ( maxilla ) in relation to the base of the skull or the temporomandibular joint . To do this, the face bow is fixed on both sides of the external auditory canal with the olives and with a nose support on the patient's head. Then the bite fork (with a heated reference mass) is pressed against the chewing surfaces or incisal edges of the maxillary teeth. Now the bite fork is screwed firmly to the face bow with the help of a joint. This completes the registration on the patient.

In the next step, the face bow is attached to the articulator and then the upper jaw model is articulated while sitting on the bite fork. The lower jaw model is articulated to match the upper jaw model based on the jaw relation determination (previously: bite registration) ( wax , silicone ...).

If a face bow is not used, a standardized plastering template must be used. This can mean that the occlusion of the new denture cannot be correctly adjusted in the laboratory. The extent to which the benefit achieved is merely an academic difference is controversial and depends to a large extent on the patient's cephalometric measurements . There are comparative studies which, from the patient's point of view, could not show that prostheses made using a face bow are more comfortable to wear .

Patient with face bow applied
Model with face bow

Individual evidence

  1. ↑ Terminology and nomenclature of the German Society for Functional Diagnostics and Therapy (DGFTD) and the German Society for Dental Prosthetics and Materials Science (DGzPW), V 2.0 of September 1, 2005, accessed on April 14, 2013

literature

  • Lexicon Dentistry Zahntechnik, Urban & Fischer, 2000 Munich - Jena
  • G. Heydecke, M. Vogeler, M. Wolkewitz, JC Türp, JR Strub: Simplified versus comprehensive fabrication of complete dentures: patient ratings of denture satisfaction from a randomized crossover trial Quintessence Int. 2008 Feb; 39 (2): 107-16
  • Y. Kawai, H. Murakami, B. Shariati, E. Klemetti, JV Blomfield, L. Billette, JP Lund, JS Feine: Do traditional techniques produce better conventional complete dentures than simplified techniques? J Dent . 2005 Sep; 33 (8): 659-68