Preliminary Study on the Assessment of the Marginal Fit of Three-Dimensional Methacrylate Oligomer Phosphine Oxide Provisional Fixed Dental Prostheses Made by Digital Light Processing

Abstract

This article aimed to assess the marginal fit of methacrylate-oligomer-phosphine-oxide curable-resin provisional-fixed dental prostheses made by digital-light-processing (DLP) three-dimensional (3D) printing. A stainless-steel master model with two abutments was scanned, and five three-unit provisional bridges were designed and printed in VITA shade A3.5 curable resin in 50 μm-thick layers. The marginal fit of each abutment was measured at six points using a profile projector. A descriptive data analysis of the fit measurements was performed by descriptive and explorative processes with the SPSS software. The curable-resin provisional restorations made by DLP 3D printing reached values of 46.37 μm (SD: 29.58 μm), which were considered clinically acceptable, with values similar to polyethylene-methacrylate and polyether-ether-ketone provisional restorations.

In Vitro Comparison between Metal Sleeve-Free and Metal Sleeve-Incorporated 3D-Printed Computer-Assisted Implant Surgical Guides

“…Nowadays, its application is not only limited to a macroscopic scale but has expanded to the microscopic cellular levels in which the technology can manufacture functional scaffolds for biomedical applications [30,31]. The biggest advantage of this technology is that it enables personalized fabrication of the object from a large variety of materials [32,33]. In the present study, a monomer based on acrylic esters and a digital light processing 3D printer were used to fabricate the surgical guides.…”

Effect of Fabrication Technique and Margin Design on the Marginal Fit of Interim Fixed Dental Prosthesis (An In-Vitro Study)

“…23 In addition, a marginal discrepancy is considered to be one of the main causes of failure of indirect restorations. 16,24,25 The assessment of the vertical marginal gap was conducted using a stereomicroscope, which is a non-invasive measuring approach according to Romeo et al 26 Additionally, Yucel et al, 27 Based on the results, the null hypothesis of this study was partially rejected.…”

“…One of the models was configured with a 1 mm-wide shoulder finish line, while the other received a 0.3 mm wide knife-edge finish line design. 16 The…”

“…The vertical marginal gap distance for each cemented FDP was measured using stereomicroscope from the restoration margin to the finish line, as shown in Figure Five equidistant measurement points were taken from three surfaces (buccal, lingual, and mesial for the first premolar and buccal, lingual, and distal for the first molar), in which 2 of these points were at the line angles of the pontic. 16 This is a total of 15 points for each retainer of the FDP. Digital image analysis software (Image J 1.49d, National Institute of Health, USA), which was used to measure and evaluate the gap.…”

Dynamic Navigation for Zygomatic Implants: A Case Report about a Protocol with Intraoral Anchored Reference Tool and an Up-To-Date Review of the Available Protocols

“…Several important surgical complications, such as sinusitis (5.86%), peri-implant mucositis (2.96%), nerve injuries (1.26%), oroantral fistula (1.20%), or even orbital perforation or infratemporal fossa invasion (1.33%) have been reported [ 5 , 9 ]. Furthermore, a good connection with the prosthetic structure strongly depends on the correct positions of the fixtures, with the risk of a too palatal implant emergence, a wrong distribution of masticatory forces, and implant mobility and prosthetic fractures [ 5 , 10 , 11 , 12 , 13 ]…”