Abstract
Computer-aided design (CAD) and additive manufacturing (AM) have shown promise in facilitating the fabrication of custom trays. Due to the clinical requirements, custom tray materials should achieve good bonding to the impression/adhesive systems. This study evaluated the retention of three fused deposition modeling (FDM) custom tray materials to a silicone impression/adhesive system before and after gritblasting (GB) by peel-off test. CAD-designed experimental test blocks were printed by FDM using acrylonitrile butadiene styrene (ABS), polyethylene terephthalate glycol copolyester (PETG), and high impact polystyrene (HIPS), and the reference test blocks were made of a conventional light-curing resin (n = 11). Before and after GB, the surface topography of all tray materials was analysed, and the maximum strength of the test block peeled off from a silicone impression/adhesive system was measured. After GB, the arithmetic mean height (Sa) and the valley fluid retention index (Svi) of the four material groups declined (p < 0.05). The peel-off strength of each of the four material groups significantly decreased by GB (p < 0.05), but no statistical difference could be found among them before or after GB. In all peel-off tests, adhesive failure occurred at the adhesive-impression material interface. The results indicated ABS, HIPS, and PETG could provide sufficient adhesion to the adhesive as the conventional light-curing resin, and GB could reduce the roughness generated by FDM and weaken the bonding between the adhesive and the silicone impression.
Highlights
The success of edentulous patients rehabilitation with complete denture prostheses depends on the accuracy of the functional impression [1]
For the custom trays fabricated by fused deposition modeling (FDM), it is crucial to achieve a good bonding with impression/adhesive systems, when the set impression is being withdrawn from the oral tissues, since even a small detachment of the impression can result in the deformation of the subsequent master cast and the failure of the prosthetic rehabilitation [10,11]
The present study aimed to investigate the retention of three selected FDM-printed tray materials (ABS, polyethylene terephthalate glycol copolyester (PETG), and high impact polystyrene (HIPS)) to a clinically applied silicone impression/adhesive system through a peel-off test
Summary
The success of edentulous patients rehabilitation with complete denture prostheses depends on the accuracy of the functional impression [1]. In conventional techniques, the fabricating process of a custom tray is complicated, time-, and labor-consuming. With the advantages of rapid turnaround time, low production costs, and acceptable manufacturing accuracy [6,7,8], FDM technology seems promising for custom tray fabrication. The FDM 3D-printer can melt and extrude thermoplastic materials, depositing them on a building platform layer by layer, manufacturing a model from the bottom up to the top [9]. For the custom trays fabricated by FDM, it is crucial to achieve a good bonding with impression/adhesive systems, when the set impression is being withdrawn from the oral tissues, since even a small detachment of the impression can result in the deformation of the subsequent master cast and the failure of the prosthetic rehabilitation [10,11]
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