A clinical evaluation of the arcon concept of articulation

Abstract An error in a face-bow transfer to instruments of single-shaft axis design is produced by any selected axis which is located facially by two points or by an adjustable axis face-bow. An instrument is capable only of plane motion in a simple opening and closing motion, and this motion may not occur with the mandible in a similar movement. However, it is not advocated that a face-bow transfer should not be used since it may minimize the error which would be produced without its use. The error involved is further incorporated in the articulation when only a protrusive record is employed to set the equivalent condylar guides of an instrument. No definite superiority could be noted in the clinical evaluation of complete dentures constructed on the arcon over the condylar type of instruments, both of which incorporate a number of averages in design. However, since fewer factors do influence the setting of the arcon guides, 1 the use of multiple maxillomandibular records, such as lateral and protrusive positional records, should be an added advantage to transfer terminal positions to an instrument of arcon design if it is capable of accepting such records.