Читать книгу Manual of Laboratory Testing Methods for Dental Restorative Materials - Paromita Mazumdar - Страница 17

Apart from the three‐point bending test, there are four‐point bending tests and biaxial bending tests.

The four‐point flexure test also employ specimens that are loaded symmetrically at two locations with loading rollers, and the distance between loading points is usually one‐third or one‐fourth of the support span length. In four‐point flexure test, maximum bending occurs between the loading points, whereas in three‐point flexure test, the maximum bending occurs below the loading roller.

Bi‐axial flexure testing is a commonly used technique for the evaluation of dental ceramics. Here force is given in two axes. Bi‐axial flexure testing is independent of specimen geometry and force direction