Trueness and precision of combined healing abutment scan body system scans at different sites of maxilla after multiple repositioning of the scan body

Mustafa Borga Donmez; Mehmet Esad Güven; Deniz Yılmaz; Samir Abou-Ayash; Gülce Çakmak; Burak Yilmaz

doi:10.1016/j.jdent.2023.104716

Trueness and precision of combined healing abutment scan body system scans at different sites of maxilla after multiple repositioning of the scan body

J Dent. 2023 Dec:139:104716. doi: 10.1016/j.jdent.2023.104716. Epub 2023 Sep 20.

Authors

Mustafa Borga Donmez¹, Mehmet Esad Güven², Deniz Yılmaz³, Samir Abou-Ayash⁴, Gülce Çakmak⁴, Burak Yilmaz⁵

Affiliations

¹ Department of Prosthodontics, Faculty of Dentistry, Istinye University, Istanbul, Turkey; Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland. Electronic address: mustafa-borga.doenmez@unibe.ch.
² Department of Prosthodontics, Faculty of Dentistry, Necmettin Erbakan University, Konya, Turkey.
³ Department of Prosthodontics, Faculty of Dentistry, Alanya Alaaddin Keykubat University, Antalya, Turkey.
⁴ Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland.
⁵ Department of Reconstructive Dentistry and Gerodontology, School of Dental Medicine, University of Bern, Bern, Switzerland; Department of Restorative, Preventive and Pediatric Dentistry, School of Dental Medicine, University of Bern, Bern, Switzerland; Division of Restorative and Prosthetic Dentistry, The Ohio State University College of Dentistry, Ohio, United States of America.

PMID: 37739057
DOI: 10.1016/j.jdent.2023.104716

Abstract

Objectives: To evaluate the accuracy of the scans of the combined healing abutment-scan body (CHA-SB) system located at different sites of the maxilla when SBs are replaced in between each scan.

Methods: Three SBs were seated into HAs located at the central incisor, first premolar, and first molar sites of a maxillary model inside a phantom head, and the model was scanned extraorally (CEREC Primescan SW 5.2). This procedure was repeated with new SBs until a total of 10 scans were performed. Standard tessellation language files of CHA-SBs at each implant location were isolated, transferred into analysis software (Geomagic Control X), and superimposed over the proprietary library files to analyze surface (root mean square), linear, and angular deviations. Trueness and precision were evaluated with one-way analysis of variance and Tukey tests. The correlation between surface and angular deviations was analyzed with Pearson's correlation (α=0.05).

Results: Molar implant scans had the highest surface and angular deviations (P≤.006), while central incisor implant scans had higher precision (surface deviations) than premolar implant scans (P=.041). Premolar implant scans had higher accuracy than central incisor implant scans on the y-axis (P≤.029). Central incisor implant scans had the highest accuracy on the z-axis (P≤.018). A strong positive correlation was observed between surface and angular deviations (r = 0.864, P<.001).

Conclusion: Central incisor implant scans mostly had high accuracy and molar implant scans mostly had lower trueness. SBs were mostly positioned apically; however, the effect of SB replacement can be considered small as measured deviations were similar to those in previous studies and the precision of scans was high.

Clinical significance: Repositioning of scan bodies into healing abutments would be expected to result in similar single crown positioning regardless of the location of the implant, considering high scan precision with the healing abutment-scan body system. The duration of the chairside adjustments of crowns in the posterior maxilla may be longer than those in the anterior region.

Keywords: Combined healing abutment-scan body; Precision; Repositioning; Trueness.

MeSH terms

Computer-Aided Design
Dental Implants*
Dental Impression Technique
Drug Repositioning*
Imaging, Three-Dimensional
Maxilla / diagnostic imaging
Models, Dental

Substances

Dental Implants