Accuracy of the Intra- and Extra-Oral Scanning Technique for Transferring the Intaglio Surface of a Pontic of Provisional Restorations to Definitive Restorations

Abstract

When taking the final impression for a three-unit fixed partial denture (FPD), the intaglio surface of the pontic of provisional restoration cannot be transferred accurately to that of definitive restoration. The intra- and extra-oral scanning (IEOS) technique, a method for accurately reproducing the submucosal morphology of the superstructure of an implant, has been reported using an intraoral scanner. In the present study, we evaluated the difference between the conventional impression method using impression material and the IEOS technique in reproducing the morphology of the surface of the pontic of a definitive FPD. There was a significant difference in the trueness of the intaglio surface morphology of the pontic between the conventional method and the IEOS technique; however, no significant difference in precision was observed. As a result, the intaglio surface of the pontic of the three-unit FPD could be transferred to definitive restorations more accurately with the IEOS technique than with the conventional method. These results suggest that the IEOS technique can duplicate the intaglio surface of the pontic more reproducibly to the definitive restorations compared with the conventional method.

Accuracy of digital scan body impression for implant supported fixed partial denture by using intra and extra-oral scanners (comparative in vitro study)

“…Regarding the results of overall precision, the results accepted the null hypotheses, as there was statistically significant difference between the tested scanners, with IOS group showing better precision. As the result of the present study came in agreement with (Sanda et al, 2021) [21] , (Braian & Wennerberg, 2019) [2] . It is also came in agreement with (Gimenez-Gonzalez -2016.Pdf, n.d.) [7] who tested precision of TrueDef scanners.…”

Soy-Based High-Protein Spheric Foods with the Appearance of Familiar Sugary Snacks

“…The 3D laser surface scanning technique has been used in a broad range of industries: assessment of residual stresses in the laser powder bed fusion of metals [17], improvement of the rolling contact joint of biomechanical implants [18], or the creation of three-unit fixed partial dentures [19]. In this study, this technique was applied to evaluate the sphericity of the soy balls using a coordinate measuring machine, NIKON Altera 10.10.8 (LK Metrology Ltd., Derby, UK), equipped with a non-contact NIKON LC15Dx laser scanning probe (Left panel, Figure 1).…”

Influence of intraoral conditions on the accuracy of digital and conventional implant impression techniques for two-implant-supported fixed dental prostheses

“…Over the past several decades, DITs using intraoral scanners have been considered an advantageous alternative to CITs because they improve comfort and are more efficient [8,9]. However, the accuracy of DITs remains inconclusive, and a wide range of values (5.38-810 µm) is documented [10].Most recent studies regarding the accuracy of implant impression techniques are limited to laboratory study designs [11][12][13][14][15][16][17], and only a few clinical studies have been reported [18]. As defined by ISO 5725-1, accuracy comprises trueness and precision.…”

“…Over the past several decades, DITs using intraoral scanners have been considered an advantageous alternative to CITs because they improve comfort and are more efficient [8,9]. However, the accuracy of DITs remains inconclusive, and a wide range of values (5.38-810 µm) is documented [10].…”