ISO 9693:2019 pdf free download – Dentistry一Compatibility testing for metal-ceramic and ceramic- ceramic systems.
6.5.4.1.2 Furnace (hot air) capable of maintaining temperatures between (80 ± 5) °C and at least (165 ± 5) °C.
6.5.4.1.3 Wire basket suitable for rapid transfer of the test specimens between the water container and the furnace and preventing them from coming in direct contact with the walls or bottom while ensuring that the specimens remain submerged in the water.
6.5.4.2 Procedure
a) Place test objects in the wire basket so that they are not contacting each other and are not under mechanical stress.
b) Place the basket in the furnace to heat the specimens to 80 °C and maintain for at least 10 mm. This process is not counted as thermal shock.
c) Transfer the test objects in the basket into the cold water with transfer time of less than 3 s. Maintain the test objects in the container for (30 ± 5) s. This step is counted as a single thermal shock.
dJ Remove the specimens from the cold water and dry them. Examine for cracks at room temperature by light microscopy at magnifications up to 10 x with trans-illumination. If no cracks are apparent, continue with step e). If any specimen exhibits cracking, report the result according to 6.5.4.3.
e) Increase the temperature of the furnace by (12,5 ± 25) °C and repeat steps b) to d).
Perform test until final failure of all specimens or until at least five thermal shocks (quenching) have been performed, whichever occurs first.
An initial furnace temperature higher than 80 °C may be used.
NOTE The holding time in the furnace of 10 mm is intended to ensure that the specimen has a uniform tern peratu re.
6.5.4.3 Test report
Prepare a test report in accordance with Clause 7.
7 Test report
Prepare a test report and report the following:
a) identification of the materials tested, including product names and lot numbers;
b) linear coefficient of thermal expansion and glass transition temperature of the veneering ceramic according to i and £2;
c) linear coefficient of thermal expansion of the substructure material according to £1;
d) the characteristic de-bonding strength obtained according to £4:
1) dimensions and thickness ratios of test specimens;
2) the value of elastic modulus E used in the analysis of measurements;
3) the results of each measurement (in MPa);
e) details of the preparation of the test specimens for thermocycling, including diagrams or photographs with a scale indicating the relative thicknesses of substructure and veneer;
f) results obtained from the thermocycling test with fixed temperature interval according to 6.5.3 (as applicable) including the following:
1) detailed test set-up covering number and preparation of test specimens [6.5.2]), apparatus
(6.5.3.1) and procedure (6.5.3.2);
2) the number of specimens that failed during the test, including the number of the thermal
shocks at which they failed;
3) the number of specimens found to have failed on examination immediately after performing
the test;
4) the number of specimens found to have failed on examination 48 h after performing the test;
g)results obtained from the thermocycling test with increasing temperature interval according to
6.5.4 (as applicable) including the following:
1) dimensions and thickness ratios for specimens used in this test;
2) detailed test set-up covering number and preparation of test specimens [6.5.2), apparatus
(6.5.4.1) and procedure (6.5.4.2).