«Torque-out» test — a new technique of evaluation of adhesive bond strength of fiber posts

Abstract

A new technique for evaluation of adhesive bond strength of fiber posts is presented. It called by the authors the “torque-out” test. Unlike the known test methods, in which a tensile or compressive load is applied to the sample, the load is produced by the torque. Samples for testing of a specific combination of post and cement can be manufactured chairside without using of special equipment. A compact installation developed by the authors designed to assess the adhesive bond strength of the connection by the value of the maximum torque is described. Using numerical modeling, the stress-strain state that occurs in the samples during push-out and torque-out tests was compared.

Keywords

• измерение адгезии
• стекловолоконный штифт
• торк-аут
• постэндодонтическая реставрация