| dc.description.abstract | Statement of problem: Taking an accurate edentulous impression is the first step in complete denture restoration and is key to ensuring that the complete dentures will have good support, retention, and stabilization functions. To ensure intra-oral stability the retention of the denture, the custom tray should be closely adapted to the intraoral tissues and should be dimensionally stable from printing time to impression appointment. In the clinical setting, the accuracy of custom trays manufactured by traditional methods may be related to the experience of the operators, the change of uneven wax thickness, and the deformation of custom trays in the whole process. 3D printed custom tray workflows have been introduced and are continuing to emerge in modern dentistry.
Purpose: The aim of this study is to investigate the intaglio surface trueness and dimensional stability of the digitally designed and 3D printed custom trays using two different types of printing resins over a 21-day period.
Materials & Methods: Two maxillary and mandibular arches were scanned in a laboratory scanner to create a master file. Maxillary and mandibular custom trays were digitally designed, and 40 trays were printed in an LCD 3D printer. Four separate groups (n = 10) were fabricated using two different types of resin. Specimens were scanned at five-time intervals time “0” (t0), on the 3rd day (t1), on the 7th (t2), on the 14th (t3) and on the 28th (t4). Scans were measured for deviations from the reference trays. Statistical analysis was performed using Kruskal-Wallis with Bonferroni corrections (α= 0.05). | |
