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

Koma Sanda,Akihiro Furuhashi,Yasunori Ayukawa,Maki Okada,Noriyuki Yasunami

doi:10.3390/ma14216489

Koma Sanda, Akihiro Furuhashi + Show 3 more

Open Access

https://doi.org/10.3390/ma14216489

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Journal: Materials	Publication Date: Oct 29, 2021
Citations: 3	License type: CC BY 4.0

Affiliation: Kyushu University, Kyushu University Hospital

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.

Highlights

The development of the intraoral scanner (IOS) has led to its use gradually spreading [1], because, compared with the conventional method using impression material and gypsum, taking impressions using IOS has many advantages, such as shortened chair time and reduced patient discomfort and risks, such as the aspiration of impression material, reduced deformation caused by the material, the fact that the results are savable as data, and the possibility of simplified data transfer to dental laboratories [2,3,4,5]
The comparison of dimensional accuracy of digital methods generated by intraoral scanning or conventional methods using alginate or silicone has been reported in several studies [6,7,8]
In fixed partial denture (FPD) treatment, the intaglio surface of the pontic should be considered with respect to cleanability [12]

Summary

Introduction

The comparison of dimensional accuracy of digital methods generated by intraoral scanning or conventional methods using alginate or silicone has been reported in several studies [6,7,8]. Most studies reported that intraoral scanners are either more accurate or as good as conventional materials [6,7,9]. When scanned under a three-unit area, more accuracy was reported compared to conventional methods [11]. In fixed partial denture (FPD) treatment, the intaglio surface of the pontic should be considered with respect to cleanability [12]. The esthetics, including the intaglio surface of the pontic and soft tissue shape, are important [13]. While the fixed partial denture is fabricated in the esthetic zone, provisional restoration with the ovate pontic is usually

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