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The Fournet "Dual Check" Articulator

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Designed By:
Sidney C. Fournet
Manufactured By:
The Prosthetic Dental Company, Pittsburg, Pennsylvania
US Patent:
2270629
Patent Date:
01/20/1942


Description:

The Fournet “Dual Check” Articulator is a simple hinge instrument that utilizes mounting devices and spherical arc templates for setting denture teeth, both mounted from vertical posts. The “Dual Check” was designed according to Monson’s Spherical Theory; however, it was also designed for grinding in the denture teeth to conform to arcs of selected radii, if required. The articulator incorporated a convex template for setting mandibular teeth and a concave template for setting the maxillary teeth. The templates were converted into grinding devices by applying sandpaper discs to the surfaces and rotating them against the teeth by turning the hand crank.

Lateral view of the Dual Check in an open position revealing the location and type the hinge mechanism.
Anterior view of the mandibular template. There were three templates of different radii.
Anterior view of a template used to set and grind the maxillary teeth.
 Lateral view showing the mandibular template used for setting and grinding the mandibular teeth.

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