Comparison of the Accuracy and Precision of Digital Scans for Implant-Supported Maxillary Hybrid Prosthesis: An in vitro Study

Abstract

Background: Numerous intraoral scanners (IOS) devices are currently used for intraoral impressions in prosthodontics. It is crucial to  assess the accuracy and precision of these devices for clinical use. Aim: This in vitro study aimed to assess and compare the accuracy and  precision of six IOS in the all-on-4 treatment concept. Trueness evaluation involved aligning the data from six dental scanners with the  reference model. Precision analysis encompassed aligning the data from all six scanners within their respective groups.

Methods: An  edentulous maxillary model was utilized, with four implants placed at 12, 15, 22, and 25 teeth positions, simulating the all-on-4 approach  using resin acrylic. Following the placement of scanbodies, each of the six IOSs (Primescan, Trios 3, Trios 4, Trios 5, Virtuo Vivo, and Medit  i 700) performed eight scans of the model. An industrial scanner was employed for the control group. Data alignment and comparison  were executed using the CloudCompare software (v2.11.3, General Public License of Telecom ParisTech, Paris, France). Statistical scrutiny  encompassed the Shapiro–Wilk, Levene’s, and Games–Howell tests.

Results: Among the scanners, Primescan exhibited the highest  trueness (35.75 ± 26.08 m), whereas the Medit i700 demonstrated superior precision (0.163 m).

Conclusion: IOS can be used to make  dental impressions within the all-on-4 concept. More comprehensive and clinical studies are needed on this subject.