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The GYSI "Simplex" Articulator Produced in 1912

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Designed By:
Alfred E. Gysi
Manufactured By:
Dentist Supply Company of New York
US Patent:
Patent Date:


The GYSI "Simplex" is an "Average Value" instrument, that is, the rotation centers, condylar guides, the incisal guide are fixed to "average" settings. The "Simplexā€¯ articulator was the average value version of the Gysi "Adaptable", a highly adjustable instrument produced in 1912. Gysi felt compelled to produce this instrument because of competition in the market place and dentist's demands for simplicity. Gysi believed that with the "Simplex" the dentist could provide efficient denture service without the need for "scientific equipment". The "Simplex" would be acceptable in 80% of the cases.

JP Articles Volume 10, No. 1, March, 2001, pp. 52-60.

JP Article Volume 11, No. 2, June, 2002, pp. 134-146.

Lateral view, closed position.
Lateral view, open position.
Posterior view, note center tension spring and extensions for a facebow.
Detail of condylar control in closed position. Note that the hinge pin is behind and below the condyle pin and fossa control.
Detail of a condylar control showing that the fossa moves up and off the condyle pin when the articulator is opened.

Dr. Edgar N. Starcke's articles in the Journal of Prosthodontics have more information on the history of articulators.