Mechanical properties of CAD/CAM-fabricated in comparison to conventionally fabricated functional regulator 3 appliances

Manufacturing of Fränkel's functional regulator 3 (FR3) is complicated and requires extensive knowledge from the dental technician. To determine whether FR3s produced by CAD/CAM techniques (CAD-FR3) meet similar mechanical properties like conventional FR3s (Con-FR3), for each of 10 patient case...

Full description

Saved in:

Bibliographic Details
Published in:	Scientific reports Vol. 11; no. 1; p. 14719
Main Authors:	Roser, Christoph, Hodecker, Lutz D., Koebel, Chris, Lux, Christopher J., Ruckes, Dorothee, Rues, Stefan, Zenthöfer, Andreas
Format:	Journal Article
Language:	English
Published:	London Nature Publishing Group UK 19-07-2021 Nature Publishing Group Nature Portfolio
Subjects:	639/166/988 692/700/1421/2025 692/700/3032/3145/3146 Humanities and Social Sciences Mechanical properties multidisciplinary Science Science (multidisciplinary)
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	Manufacturing of Fränkel's functional regulator 3 (FR3) is complicated and requires extensive knowledge from the dental technician. To determine whether FR3s produced by CAD/CAM techniques (CAD-FR3) meet similar mechanical properties like conventional FR3s (Con-FR3), for each of 10 patient cases, three CAD-FR3 designs (palatal connector cross-section 3 × 3 mm, 4 × 1 mm or 5 × 2 mm) and one Con-FR3 were subjected to cyclic loading and subsequent fracture testing in a universal testing device. Transversal load capacity (F max(FR3) ) and stiffness were compared among the different CAD-FR3 designs and Con-FR3s using Friedman and Wilcoxon tests with a significance level of α = 0.05. All CAD-FR3 designs had significantly higher mean F max(FR3) ( p ≤ 0.007) and stiffness ( p ≤ 0.005) than the Con-FR3s. The CAD-FR3 3×3 had the highest mean F max(FR3) (98.2 ± 26.2 N) and stiffness (37.1 ± 15.5 N/mm), closely followed by the CAD-FR3 5×2 (F max(FR3) : 90.3 ± 24.7 N; stiffness: 30.0 ± 12.3 N/mm). Among the CAD appliances, CAD-FR3 4×1 had the lowest values ( p ≤ 0.007 for all pairwise tests) with F max(FR3) of 45.8 ± 17.9 N and stiffness of 12.5 ± 7.3 N/mm. CAD-FR3s have superior mechanical properties in comparison to Con-FR3s if certain design parameters are followed. Further clinical investigations have to examine if they can serve as an alternative in practice.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2045-2322 2045-2322
DOI:	10.1038/s41598-021-94237-x