Impression materials testing

Comparison of the long-scale accuracy, form reproduction and stability of a range of impression materials.

Long-scale accuracy

Here we are comparing the long-scale accuracy of various materials, looking just at the magnitude of the error, not the vector.

Renishaw agreed confidentiality when testing, so we cannot reveal the names of the products shown.

Alginate storage

Here we look at alginate materials, widely used in clinical practice.  Particularly important is the storage of alginate impressions.

For this test we looked at diameter measurements of the spheres, important for form accuracy when considering crown work. The impression was left in a moist environment as per manufacturers’ instructions.

Even after storage for 24 hours, we have exceeded the 100 µm error budget.

Impression stability

Impressions were taken of a prepared tooth and left to relax for different times before pouring the model.

This test showed that there was no difference between an immediately poured impression or one left to relax.

Recommended inciseTM materials and accessories

We recommend the following materials and accessories for use with the inciseTM process:

Material / accessory	Renishaw inciseTM recommendations
Impression trays	Perforated metal tray
Tray material	Coltene Whaledent® Affinis™ MonoBody tray material Kettenbach Monopren® transfer tray material
Wash material	Coltene Whaledent® Affinis™ Regular Body wash Kettenbach Panasil® initial contact light or extra light wash
Impression method	Simultaneous application of wash and tray material by dentist and nurse
Model stone	inciseTM model stone matched to the impression
Cement	Kururay Panavia® F Cement

Buy inciseTM-approved materials

Tested and recommended for the inciseTM process, Exact Dental Supplies provides all the products needed to take the most accurate impressions.

www.exactdentalsupplies.com