Elastic recovery after deformation of the new 3M ESPE Position Tray

 

M. SCHAAF, S. ARNDT

3M ESPE, Seefeld, Germany

 

Objective: To evaluate the stiffness and elastic recovery of the new plastic impression tray and to give a recommendation for the earliest possible pouring time.

 

Methods: 20 maxillary impressions were taken using the preliminary impression material Position Penta Quick (3M ESPE). The trays were horizontally mounted in the Zwick universal testing machine (Zwick Z010) in the molar region.

A clinically relevant force of 100N was applied onto the handle to mimic the process of removing the tray from the mouth. The testing speed was 30mm/min, the loading time 3 sec. The degree of recovery to its starting position over time was measured, the reference point was located at the connection between tray and handle.

 

Results:

time after unloading	0 min	5 min	10 min
remaining deformation	0.20 mm	0.10 mm	0 mm
recovery	99.4%	99.7%	100%

The handle of the impression tray showed a deformation between 6.1 and 6.7 mm when loaded with 100N.

Immediately after removing the load, the tray moved back to 99.4% of its initial position. This process steadily continues within the next 10 minutes. For all trays, the starting position was fully reached, no plastic deformation of any of the Position Trays could be observed.

Conclusion: After removing from the mouth, the Position Tray shows an elastic recovery of 100% within the first 10 minutes. Immediate pouring after disinfection can be recommended.

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