Trueness and Precision Achieved With Conventional and Digital Implant Impressions: A Comparative Investigation of Stone Versus 3-D Printed Master Casts.

Mathey, Ayse; Brägger, Urs; Joda, Tim (2021). Trueness and Precision Achieved With Conventional and Digital Implant Impressions: A Comparative Investigation of Stone Versus 3-D Printed Master Casts. European journal of prosthodontics and restorative dentistry EJPRD, 29(3) Barber 10.1922/EJPRD_2114Mathey08

[img] Text
02114_Mathey_proof.pdf - Published Version
Restricted to registered users only
Available under License Publisher holds Copyright.

Download (1MB) | Request a copy

OBJECTIVE

To analyze implant casts obtained from intraoral optical scanning and conventional impressions.

MATERIALS AND METHODS

Ten optical scans (test) and ten conventional polyether impressions (control) were obtained from a two-implant reference model. Ten casts each were manufactured additively or from stone. All casts were digitized and virtually superimposed to the digital reference (trueness) applying a best-fit algorithm, and secondary analysis for intra-group comparisons (precision). The signed nearest neighbor distance of each surface point (FDI:24/26) was computed and deviations of the three-dimensional vectors (X,Y,Z) analyzed. The groups were compared with the Wilcoxon's rank sum test.

RESULTS

The printed casts had mean deviations of 106.0μm and the stone casts 187.9μm compared to the reference. Controls had significantly higher deviations and dispersion (p⟨0.001). The printed casts showed mean intra-group deviations of 149.8μm and the stone casts 181.2μm without significant differences (p=0.162). There was no statistically significant difference in any of the vector analyses (X:p=0.105, Y:p=0.089, Z:p=0.123).

CONCLUSION

Optical scanning seems to be an alternative to conventional impressions in terms of trueness and precision of implant master casts, simulating the scenario of a three-unit implant-supported fixed dental prosthesis. Digitally manufactured master casts might serve as reliable reference for the final restorations.

Item Type:

Journal Article (Original Article)

Division/Institute:

04 Faculty of Medicine > School of Dental Medicine > Department of Reconstructive Dentistry and Gerodontology

UniBE Contributor:

Mathey, Ayse and Brägger, Urs

Subjects:

600 Technology > 610 Medicine & health

ISSN:

0965-7452

Publisher:

Barber

Language:

English

Submitter:

Tina Lauper

Date Deposited:

25 May 2021 11:43

Last Modified:

04 Sep 2021 01:31

Publisher DOI:

10.1922/EJPRD_2114Mathey08

PubMed ID:

33508182

Uncontrolled Keywords:

Digital Dentistry Implant Master Casts Intra-Oral Scan (IOS) Rapid Prototyping

BORIS DOI:

10.48350/151746

URI:

https://boris.unibe.ch/id/eprint/151746

Actions (login required)

Edit item Edit item
Provide Feedback