Fit of complete-arch implant-supported prostheses produced from an intraoral scan by using an auxiliary device and from an elastomeric impression: A pilot clinical trial

In vitro scanning accuracy using different aids for multiple implants in the edentulous arch

“…The accuracy of the IOS used in this study showed comparable results to other scanners (Albayrak et al, 2021; Di Fiore et al, 2019; Mangano et al, 2019; Roig et al, 2021). To be able to use the IOS properly and acquire not only the scan bodies but also to peri‐implant soft tissue, the scan aid was designed accordingly.…”

“…The use of an auxiliary device or the modification of existing scan bodies has already been investigated by different authors (Carneiro Pereira et al, 2021; Gómez‐Polo et al, 2020; Huang et al, 2020; Iturrate et al, 2019; Pan et al, 2021; Roig et al, 2021). The goal of all devices and modifications was to minimize or compensate stitching errors by providing an “optical bridge” between implant scan bodies resulting in higher trueness.…”

“…Comparison of results can become challenging due to various factors as, for example, the alignment algorithm or the reference geometries as they can influence the results significantly (Peroz et al, 2021). The remaining studies either used a best‐fit algorithm on all the scan bodies for alignment, did not align test and control group due to different method of evaluation, did not report results in numerical values, or only described a technique (Carneiro Pereira et al, 2021; Gómez‐Polo et al, 2020; Huang et al, 2020; Iturrate et al, 2019; Roig et al, 2021). In conclusion, all studies showed an increase of accuracy by using an additional device or method when scanning the position of the implant.…”

“…Previous studies modified the design of scan bodies and reported improved median trueness (28 μm) when compared to no modification (36 μm) (Huang et al, 2020). None of the studies compared materials in varying colors and their influence on scanning accuracy (Iturrate et al, 2019; Pan et al, 2021; Roig et al, 2021).…”

“…However, original scan body features including the anti‐rotational index are masked (Huang et al, 2020). Various authors used “auxiliary geometric devices” or occlusally connected implant scan bodies to improve trueness and precision of the IOS (Carneiro Pereira et al, 2021; Gómez‐Polo et al, 2020; Iturrate et al, 2019; Roig et al, 2021). All presented methods necessitate additional steps like individual fabrication of auxiliary devices or additional clinical procedures.…”