Four Digital Intraoral Scanners versus Conventional Impression Technique: An In-Vitro Evaluation of Fit Accuracy on Multiunit Abutments for Cross Arch Implant Restorations

Document Type : Original articles

Authors

1 Implantology, Cairo university, Egypt

2 Fixed prosthodontics, Cairo university, Egypt

3 Prosthodontics, Cairo university

Abstract

Aim: This study aimed to compare the passive fit of a full-arch implant zirconium superstructure using conventional impressions versus digital impressions with four intraoral scanners.
Materials and methods: Four implants were installed in an epoxy resin mandibular cast in canine-molar regions bilaterally. Twenty-five frameworks were fabricated; in Group 1, twenty milled frameworks were fabricated using 4 intraoral scanners (IOS) (Cerec primescan(G1P), Cerec Omnicom(G1O), Medit i700(G1M), and 3Shape Trios4(G1T)), while in Group 2(G2), five conventional frameworks were fabricated using a conventional splinted open tray impression technique. The passive fit of all 25 frameworks was evaluated using the Sheffield test, and the marginal gap distance was measured using a stereomicroscope when all implant screws were tightened.
Results: All frameworks were considered passive using the Sheffield test. Cerec Primscan showed the lowest marginal gap values when evaluated using a stereomicroscope. 3Shape Trios4, Cerec Omnicom, and Medit i700 showed similar gap values, while the highest gap values were presented in the conventional impression group (G2).
Conclusions: Intraoral scanners can be used efficiently with scan bodies in the fabrication of cross-arch implant restorations. Cerec primscan proved to be higher in precision than other tested intraoral scanners

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Ain Shams Dental Journal
Volume 35, Issue 3
September 2024
Pages 324-333

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