INTAGLIO SURFACE TRUENESS OF MILLED VS 3D PRINTED PROVISIONAL OCCLUSAL VENEERS - AN IN VITRO STUDY

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Abstract
Aim of the study: The latest CAD/CAM technologies allow provisional restorations to be produced by milling or 3D printing methods. The two methods differ in terms of cost, speed and working protocol. An important factor of a successful provisional restoration is the fidelity of the intaglio surface and its adaptation to the preparation surface. How faithful is the adaptation of these temporary restorations to the preparation surface and are there differences between the manufacturing methods in terms of intaglio surface trueness? Materials and Methods: A preparation for occlusal veneer was performed on an upper molar of a typodont. The preparation was scanned with an intraoral scanner (Medit i700) and the table-top restauration was designed using a CAD software. Based on the CAD design, 45 restorations were produced using the two technologies: 15 milled restorations from Telio CAD (Ivoclar), 15 milled restorations from Brilliant Crios (Coltene), and 15 3D printed restorations (GC Temp Print resin). The intaglio surfaces of the milled and printed restorations were scanned using the same intraoral scanner. In order to assess the intaglio surface trueness, each scan was superimposed and compared to the original CAD design file of the restauration with the help of a metrology grade, quality control software. Results: Statistically significant differences were found between the analysed groups of values. The printed restoration group showed slightly higher deviation values than the milled ones, the Telio CAD group with an average of 37 microns and the Brilliant Crios group with an average of 36 microns. Conclusions: The milled occlusal veneers showed slightly better results of the intaglio surface trueness while both milled and printed restorations showed trueness values within the accepted limit, indicating a clinically acceptable fit.

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