Photoelastic experiments on facings laminated to teeth

Abstract

The influence of various cervical designs of laminated facings was investigated. A variation in the attachment between tooth and facing was also investigated, to examine the influence of partly bad adherence of the resin. The facings were incisally loaded at three different angulations. The study was made in a polariscope, using an Na light source and quarter wave plates. Lack of adhesion of the laminate incisally or cervically created a higher fringe order than when the middle part suffered from insufficient bonding. The shape of the cervical part had only a minor effect on the stress distribution in the facing.