Laboratory assessment of the accuracy of two different resins designed for 3D printing for cast metal frameworks and suprastructures

DRJNY ePOSTER BASIC RESEARCH

Background: The longevity and clinical success has always been dependent on the accuracy of the final restorations. In the contemporary prosthetics almost any restoration could be digitally designed but the final process materializing still encounters some serious obstacles.

Aim/Hypothesis: The purpose of the article is to present a laboratory assessment between some of the characteristics of two different resin materials, designed for 3 D printing of patterns for casting of frameworks or pressing of ceramics.

Materials and Methods: Total number of 180 sample objects were digitally planned and printed on Formlabs 2. The comparison was made between “Castable” resin and “Castable Wax” resin. For each resin were printed equal number of samples with cillINDIAr shape and cubic shape, that were solid, hollowed, and hollowed with vent. In order to investigate the influence of alignment against the printing platform on the accuracy, three different alignments were used: aligned on the flat side, on the linear edge and on the angle. Measurements were made after the printing for both resins, and for “Castable” resin the same measurements were repeated after the cycle of post curing.

Results: Showed significant discrepancies in accuracy of printing for “Castable” compared to “Castable Wax” resin. The results showed significant influence dependent on type of alignment in “Castable” resin and no statistically significant influence on “Castable Wax” resin. The postpolymerisation of “Castable” resin, that is a part of the protocol, also created some additional discrepancies due to the additional shrinkage.

Conclusions and Clinical Implications: A better and more predictable results in 3D printing of patterns for casting could be obtained by using hollow vent patterns when working with “Castable” resin and the alignment should be strictly starting from the smallest contact point against the platform. Post curing could be avoided to decrease additional distortion. In any case where accuracy is outstanding, especially on screw retained multi implant cases should be used “Castable Wax” resin.

Keywords: 3D Printing, Metal frameworks