Effect of Abutment Tooth Location on the Accuracy of Digital Impressions Obtained Using an Intraoral Scanner for Removable Partial Dentures

Authors

Kazuki Sakamoto
Junichiro Wada
Yuki Arai
Hironari Hayama
Yurika Ishioka
Eung-Yeol Kim
Ryunosuke Kazama
Yusuke Toyoshima
Noriyuki Wakabayashi

Language

English

Publication Date

10-13-2023

Journal

Journal of Prosthodontic Research

DOI

10.2186/jpr.JPR_D_22_00201

PMID

36775339

Abstract

Purpose: To verify the effect of abutment tooth location on the accuracy of digital impressions obtained using an intraoral scanner (IOS) for removable partial dentures (RPDs).

Methods: The target abutment teeth included the left first premolar (#34), second molar (#37), and right second premolar (#45) in a mandibular Kennedy class II model and the left and right second molars (#37, #47) in a class III model. Only #37 was isolated from the remaining teeth by the mucosal area in both models. Digital impressions were obtained using a desktop scanner (reference data) and an IOS (IOS data; scanning origin #37; n=10). The general trueness based on the entire model superimposition (TG), local trueness (TL) of an individual tooth, and dimensional accuracy (coordinate and linear accuracy) of the IOS data of the target abutment teeth were compared (α=0.05).

Results: In both models, #37 showed significantly inferior TG (P< 0.01), superior TL (P< 0.01), and mesial coordinate displacement (P< 0.01 and P< 0.05 in class II and III models, respectively). Intra-model comparisons showed that #45 in the class II model and #47 in the class III model had significantly inferior linear accuracy (P< 0.05 and P< 0.01, respectively) and buccal coordinate displacement (P< 0.05 and P< 0.01, respectively) compared with the other target teeth.

Conclusions: In digital impressions of RPDs, isolation of abutment teeth by mucosal areas can reduce general trueness based on the entire dental arch and mesial tooth displacement, whereas increased distance from the scanning origin can adversely affect local trueness and dimensional accuracy.

Keywords

Accuracy, Digital impression, Intraoral scanner, Removable partial denture, Trueness

Published Open-Access

yes

Recommended Citation

Sakamoto, Kazuki; Wada, Junichiro; Arai, Yuki; et al., "Effect of Abutment Tooth Location on the Accuracy of Digital Impressions Obtained Using an Intraoral Scanner for Removable Partial Dentures" (2023). Faculty, Staff and Student Publications. 143.
https://digitalcommons.library.tmc.edu/uthdb_docs/143