Testing of Dental Materials

Hardness test

3- and 4-Point Flexure Test Kit for the Testing of Ceramics to EN 843-1 and ISO 6872 

The test kit is designed for flexure tests on ceramics to EN 843-1, specimen shapes A and B, and ISO 6872. The base of the test kit is a guide frame equipped with a safety device, which includes the flexure table and die required for the flexure test. The required load cell is integrated permanently in the guide frame by the factory. 

The linear guide in the guide frame ensures exact alignment between the flexure table and the die. This makes mounting and dismantling the test kit easy, since realignment is not necessary. The anvils offer the degree of motion required by the test standards, ensuring that specimen is loaded in the most ideal way possible. Support rollers made of hard metals ensure minimal deformation at the support points. 

A suitable measuring transducer is available for determining the flexural elasticity modulus.

Dentalflexure1
Dentalflexure2
Hardness test

Hardness Tests on Dental Ceramics

Dental ceramics used as filling material or as restorative material must, in addition to health and visual considerations, satisfy requirements regarding strength, wear and durability.

Visual requirements can be custom-made by replicating the light effects of natural mineral dental enamel, including opalescence, fluorescence, and transparency through layers of color of varying intensity. 

Strength properties can, for example, be verified by means of hardness testing. Due to limited reflectivity, the optical hardness testing method to Vickers can only be employed to a limited degree. However the instrumented indentation test, based on measurement of indentation depth, has proven very effective. 

Other mechanical characteristics, in addition to hardness, can be derived from the entire test sequence, for example allowing creep or relaxation of the dental material to be measured.

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Hardness testing of medical materials

Fully automatic Zwick hardness testing machine with a motorized displacement unit.

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