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Journal of Prosthetic Dentistry

Influence of artificial landmarks on the accuracy of complete arch scans in the partially edentulous maxilla: An in vitro study

Published:November 24, 2022DOI:https://doi.org/10.1016/j.prosdent.2022.08.011

      Abstract

      Statement of problem

      Scan path length and the presence of edentulous alveolar ridge sections have a negative influence on scanning accuracy. How different artificial landmarks combined with an adapted scanning method affect accuracy is unclear.

      Purpose

      The purpose of this in vitro study was to determine the influence of 2 different artificial landmarks combined with an adapted scanning method on the scanning accuracy of a partially edentulous maxillary model.

      Material and methods

      The model simulated a maxilla with 6 prepared teeth to accommodate a complete arch fixed partial denture. Five ceramic precision balls (ball center P1–P5), distributed buccally to the dental arch, were used to detect the dimensional and angular changes between the reference model and the intraoral scans. One intraoral scanner (Primescan) was used to make 30 scans each with either the scanning strategy recommended by the manufacturer (M) or with an adapted scanning strategy and the use of a bar (B) or 4 plates (P) as artificial landmarks in the dorsal palate. Data were statistically analyzed using a generalized least squares regression model (α=.05).

      Results

      Scanning with artificial landmarks reduced the maximum absolute distance deviations (M: 249 μm, B: 190 μm, P: 238 μm) and the maximum angle deviations (M: 0.31 degrees, B: 0.28 degrees, P: 0.26 degrees). Vertical distance deviations were improved by 10 to 50% with the use of artificial landmarks. Absolute mean distance deviations were significantly lower for group M (P<.001). In contrast, with artificial landmarks, mean angle (P<.001) and mean vertical distance deviations (P<.014) improved significantly.

      Conclusions

      Scanning with artificial landmarks in the dorsal palate combined with an adapted scanning method improved the scanning accuracy and reliability of vertical distance deviations.
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      References

        • Joda T.
        • Lenherr P.
        • Dedem P.
        • Kovaltschuk I.
        • Bragger U.
        • Zitzmann N.U.
        Time efficiency, difficulty, and operator's preference comparing digital and conventional implant impressions: a randomized controlled trial.
        Clin Oral Implants Res. 2017; 28: 1318-1323
        • Chochlidakis K.M.
        • Papaspyridakos P.
        • Geminiani A.
        • Chen C.J.
        • Feng I.J.
        • Ercoli C.
        Digital versus conventional impressions for fixed prosthodontics: A systematic review and meta-analysis.
        J Prosthet Dent. 2016; 116: 184-90 e12
        • Goujat A.
        • Abouelleil H.
        • Colon P.
        • Jeannin C.
        • Pradelle N.
        • Seux D.
        • et al.
        Marginal and internal fit of CAD-CAM inlay/onlay restorations: A systematic review of in vitro studies.
        J Prosthet Dent. 2019; 121: 590-597 e3
        • Keul C.
        • Stawarczyk B.
        • Erdelt K.J.
        • Beuer F.
        • Edelhoff D.
        • Guth J.F.
        Fit of 4-unit FDPs made of zirconia and CoCr-alloy after chairside and labside digitalization--a laboratory study.
        Dent Mater. 2014; 30: 400-407
        • Derksen W.
        • Tahmaseb A.
        • Wismeijer D.
        Randomized Clinical Trial comparing clinical adjustment times of CAD/CAM screw-retained posterior crowns on ti-base abutments created with digital or conventional impressions. One-year follow-up.
        Clin Oral Implants Res. 2021; 32: 962-970
        • Derksen W.
        • Tahmaseb A.
        • Wismeijer D.
        A Randomized Clinical Trial comparing the clinical fit of CAD/CAM monolithic zirconia Fixed Dental Prostheses (FDP) on ti-base abutments based on digital or conventional impression techniques. One year follow-up.
        Int J Prosthodont. 2021; 34: 733-743
        • Park G.H.
        • Son K.
        • Lee K.B.
        Feasibility of using an intraoral scanner for a complete-arch digital scan.
        J Prosthet Dent. 2018; 121: 803-810
        • Waldecker M.
        • Rues S.
        • Behnisch R.
        • Rammelsberg P.
        • Bomicke W.
        Effect of scan-path length on the scanning accuracy of completely dentate and partially edentulous maxillae.
        J Prosthet Dent. 2022; (Epub ahead of print; pii: S200223913(22)00121-X)
        • Waldecker M.
        • Rues S.
        • Rammelsberg P.
        • Bomicke W.
        Accuracy of complete-arch intraoral scans based on confocal microscopy versus optical triangulation: A comparative in vitro study.
        J Prosthet Dent. 2021; 126: 414-420
        • Lee J.H.
        • Yun J.H.
        • Han J.S.
        • Yeo I.L.
        • Yoon H.I.
        Repeatability of Intraoral Scanners for Complete Arch Scan of Partially Edentulous Dentitions: An In Vitro Study.
        J Clin Med. 2019; 8: 1187
        • Carneiro Pereira A.L.
        • Souza Curinga M.R.
        • Melo Segundo H.V.
        • da Fonte Porto Carreiro A.
        Factors that influence the accuracy of intraoral scanning of total edentulous arches rehabilitated with multiple implants: A systematic review.
        J Prosthet Dent. 2021; (Epub ahead of print; pii: S0022-3913(21)00485-6)
        • Kim J.E.
        • Amelya A.
        • Shin Y.
        • Shim J.S.
        Accuracy of intraoral digital impressions using an artificial landmark.
        J Prosthet Dent. 2017; 117: 755-761
        • Rutkunas V.
        • Gedrimiene A.
        • Al-Haj Husain N.
        • Pletkus J.
        • Barauskis D.
        • Jegelevicius D.
        • et al.
        Effect of additional reference objects on accuracy of five intraoral scanners in partially and completely edentulous jaws: An in vitro study.
        J Prosthet Dent. 2021; (Epub ahead of print; pii: S0022-3913(21)00560-6)
        • Iturrate M.
        • Eguiraun H.
        • Solaberrieta E.
        Accuracy of digital impressions for implant-supported complete-arch prosthesis, using an auxiliary geometry part-An in vitro study.
        Clin Oral Implants Res. 2019; 30: 1250-1258
        • Medina-Sotomayor P.
        • Pascual-Moscardo A.
        • Camps I.
        Accuracy of four digital scanners according to scanning strategy in complete-arch impressions.
        PLoS One. 2018; 13: e0202916
        • Latham J.
        • Ludlow M.
        • Mennito A.
        • Kelly A.
        • Evans Z.
        • Renne W.
        Effect of scan pattern on complete-arch scans with 4 digital scanners.
        J Prosthet Dent. 2020; 123: 85-95
        • Oh K.C.
        • Park J.M.
        • Moon H.S.
        Effects of Scanning Strategy and Scanner Type on the Accuracy of Intraoral Scans: A New Approach for Assessing the Accuracy of Scanned Data.
        J Prosthodont. 2020; 29: 518-523
        • Waldecker M.
        • Bomicke W.
        • Behnisch R.
        • Rammelsberg P.
        • Rues S.
        In-vitro accuracy of complete arch scans of the fully dentate and the partially edentulous maxilla.
        J Prosthodont Res. 2021; (Epub ahead of print)
        • Waldecker M.
        • Rues S.
        • Awounvo Awounvo J.S.
        • Rammelsberg P.
        • Bomicke W.
        In vitro accuracy of digital and conventional impressions in the partially edentulous maxilla.
        Clin Oral Investig. 2022; (Epub ahead of print)
        • Waldecker M.
        • Rues S.
        • Trebing C.
        • Behnisch R.
        • Rammelsberg P.
        • Bomicke W.
        Effects of Training on the Execution of Complete-Arch Scans. Part 2: Scanning Accuracy.
        Int J Prosthodont. 2021; 34: 27-36
        • Waldecker M.
        • Leckel M.
        • Rammelsberg P.
        • Bomicke W.
        Fully digital fabrication of an occlusal device using an intraoral scanner and 3D printing: A dental technique.
        J Prosthet Dent. 2019; 121: 576-580
        • Keul C.
        • Guth J.F.
        Accuracy of full-arch digital impressions: an in vitro and in vivo comparison.
        Clin Oral Investig. 2020; 24: 735-745
        • Muller P.
        • Ender A.
        • Joda T.
        • Katsoulis J.
        Impact of digital intraoral scan strategies on the impression accuracy using the TRIOS Pod scanner.
        Quintessence Int. 2016; 47: 343-349
        • International Organization for Standardization. ISO 20896-1
        Dentistry – Digital impression devices – Part 1: Methods for assessing accuracy.
        International Organization for Standardization, Geneva2019 (ICS: 11.060.01 (Date: 2022-08-11) Aviable at:)
        • Schmidt A.
        • Klussmann L.
        • Wostmann B.
        • Schlenz M.A.
        Accuracy of Digital and Conventional Full-Arch Impressions in Patients: An Update.
        J Clin Med. 2020; 9
        • Iturrate M.
        • Amezua X.
        • Garikano X.
        • Solaberrieta E.
        Use of measuring gauges for in vivo accuracy analysis of intraoral scanners: a pilot study.
        J Adv Prosthodont. 2021; 13: 191-204
        • Ender A.
        • Zimmermann M.
        • Mehl A.
        Accuracy of complete- and partial-arch impressions of actual intraoral scanning systems in vitro.
        Int J Comput Dent. 2019; 22: 11-19
        • McLean J.W.
        • von Fraunhofer J.A.
        The estimation of cement film thickness by an in vivo technique.
        Br Dent J. 1971; 131: 107-111
        • Parfitt G.J.
        Measurement of the physiological mobility of individual teeth in an axial direction.
        J Dent Res. 1960; 39: 608-618