3M Innovative Properties Company

James D Hamer

Richard Paul Rusin

Brian N Holmes

Jacqueline C Rolf

Brady P Haislet

Roxanne A Boehmer

Melinda B Gustafson

Charles G Carter

Tara Waldrop

Disclosed herein a dental mill blank and a method of forming the dental mill blank. The dental mill blank includes a first layer of a first hard restorative material having a first translucency and a first shade, a second layer of a second hard restorative material having a second translucency and a second shade, where at least one of the following is true (1) the first translucency is different from the second translucency, (2) the first shade is different from the second shade. The first layer and the second layer form a first interface having a first curve across a first plane of symmetry of the dental mill blank, where the first curve has a different from zero curvature; and a first straight line along the entire length of a second plane of the dental mill blank, the second plane being orthogonal to the first plane of symmetry.

Dental mill blank

A method of making a positive model of a tooth or gum involving the steps of pouring hardenable positive impression material into a negative impression of the tooth or gum comprising a curved, vinyl polysiloxane composition, and hardening the positive impression material, wherein the improvement involves applying finely divided palladium over at least part of the surface of the negative impression that will contact the positive impression material before pouring the hardenable positive impression material.

Method of reducing surface defects in a positive dental model

A method of making a positive model of a tooth or gum including the steps of pouring hardenable positive impression material into a negative impression of the tooth or gum comprising a cured, vinyl polysiloxane composition, and hardening the positive impression material, and further including applying finely divided palladium over at least part of the surface of the negative impression that will contact the positive impression material before pouring the hardenable positive impression material.

Growing community of inventors

White Bear Lake, MN, United States of America

James D Hamer