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Comparative assessment of marginal and internal gaps of cast-free monolithic zirconia crowns fabricated from 2 intraoral scanners: A prospective, double-blind, randomized clinical trial

Authors
 Su-Min Cho  ;  Kyung Chul Oh  ;  Ji-Man Park  ;  Jung-Hwa Lim  ;  Jae-Sung Kwon 
Citation
 JOURNAL OF PROSTHETIC DENTISTRY, Vol.129(1) : 69-75, 2023-01 
Journal Title
JOURNAL OF PROSTHETIC DENTISTRY
ISSN
 0022-3913 
Issue Date
2023-01
MeSH
Computer-Aided Design* ; Crowns ; Dental Impression Technique ; Dental Marginal Adaptation ; Dental Prosthesis Design* ; Humans ; Prospective Studies
Abstract
Statement of problem: Despite the introduction of intraoral scanners (IOSs) with dual camera triangulation, only a few comparative clinical studies have evaluated their clinical performances in the digital workflow for cast-free restorations.

Purpose: The purpose of this clinical trial was to assess the clinical efficacy of 2 different technology-based IOSs by evaluating the marginal and internal gaps of cast-free monolithic zirconia crowns fabricated by using a fully digital workflow.

Material and methods: A prospective randomized clinical trial was conducted in 35 participants requiring a single-unit restoration. One crown was fabricated from the scan data obtained with a confocal microscopy-based IOS (Group T), while the other was made with the scan data obtained from an IOS using dual camera triangulation (Group I). A replica technique was used to assess the marginal and internal gaps. The buccolingual and mesiodistal cross-sections were measured, and noninferiority trials were performed.

Results: A total of 39 teeth from 35 participants were restored with a single-unit crown. The marginal and axial wall gaps of the crowns in Group I was not inferior to that of the crowns in Group T (upper limit confidence interval [CI] <30). In contrast, the gap of the crowns at the line angle in Group T was inferior to that of the crowns in Group I (lower limit CI <-30). From an occlusal space perspective, the gap of the crowns in Group I was inferior to that of the crowns in Group T (upper limit CI >30). Twenty-five crowns were selected from Group I, and 14 crowns were selected from Group T for definitive placement.

Conclusions: The marginal gap of the crown fabricated by using the scan data obtained from the dual camera triangulation-based IOS was noninferior to that obtained from the confocal microscopy-based IOS and was within the clinically applicable limit.

Copyright © 2022 Editorial Council for the Journal of Prosthetic Dentistry. Published by Elsevier Inc. All rights reserved.
Full Text
https://www.sciencedirect.com/science/article/pii/S0022391322004310
DOI
10.1016/j.prosdent.2022.05.035
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Dental Biomaterials and Bioengineering (치과생체재료공학교실) > 1. Journal Papers
2. College of Dentistry (치과대학) > Dept. of Prosthodontics (보철과학교실) > 1. Journal Papers
Yonsei Authors
Kwon, Jae-Sung(권재성) ORCID logo https://orcid.org/0000-0001-9803-7730
Oh, Kyung Chul(오경철) ORCID logo https://orcid.org/0000-0003-4584-2597
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/196036
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