Ring Formers & Patterns

About ring formers

Ring formers serve the ringless technique: a removable cylindrical outer form that permits unrestricted expansion of the investment, unlike a steel ring. The high strength of the investment material is what makes it possible to cast without the ring.

A removable form used in place of a steel ring.

Sources: The Glossary of Prosthodontic Terms, 9th edition (J Prosthet Dent 2017) · Marginal fit of Ni-Cr cast copings made with metal ring and ringless investment systems, 2016 (PMC4762291)