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

Su Min Cho, Kyung Chul Oh, Ji Man Park, Jung Hwa Lim, Jae Sung Kwon

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
JournalJournal of Prosthetic Dentistry
DOIs
Publication statusAccepted/In press - 2022

Bibliographical note

Funding Information:
Funding: This work was supported by a grant (HI18C0435) of the Korea Health Technology R&D Project through the Korea Health Industry Development Institute (KHIDI), funded by the Ministry of Health & Welfare, and the Technology Innovation Program (20007888) funded by the Ministry of Trade, Industry & Energy (MOTIE). The funder had no role in study design, data collection and analysis, decision to publish, or manuscript preparation.

Publisher Copyright:
© 2022 Editorial Council for the Journal of Prosthetic Dentistry

All Science Journal Classification (ASJC) codes

  • Oral Surgery

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