A VERSACRYL Internal Clasp

VERSACRYL internal clasps are not imitations of conventional springy metal clasp assemblies. The principles involved in their construction and use involve a new approach to the design of partial dentures.

The denture is constructed with conventional pink denture acrylic (combined with a passive metal framework, if indicated), except in the area around the chosen abutment tooth, where two different rigidities of VERSACRYL are incorporated. The softest one will engage the useable undercut, which should be located in the interproximal or even in the lingual area of the abutment tooth. The harder VERSACRYL rigidity is used to extend short, flat extrusions from the pink denture base, onto the abutment to serve as bracing elements only. Do not attempt to engage large buccal undercuts with a VERSACRYL clasp.

When designing a metal frame, it should be kept away from the useable interproximals, in order to make room to apply the softer VERSACRYL cushion retention in those areas. To insert the partial denture, the patient runs hot tap water on the clasp assembly for 20 seconds and then without delay, places the denture in the mouth and uses finger pressure to push the denture into place. Never use opposing teeth to bite the denture in place. The partial denture is now lodged onto the abutment tooth. To remove, the patient rinses with warm water around the clasp area in the mouth and immediately takes out the denture.

A VERSACRYL Internal clasp incorporated into an upper denture

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