Two-body wear of occlusal splint materials from subtractive computer-aided manufacturing and three-dimensional printing

Objectives To investigate the two-body wear of occlusal splint materials fabricated from subtractive computer-aided manufacturing (CAM) compared to three-dimensional printing (3DP). Material and methods Forty-eight substrates ( n  = 12/material) in the design of a mandibular first molar were fabrica...

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Bibliographic Details
Published in:Clinical oral investigations 2022-09, Vol.26 (9), p.5857-5866
Main Authors: Schmeiser, Felix, Baumert, Uwe, Stawarczyk, Bogna
Format: Article
Language:English
Subjects:
Abrasion
Aging
Antagonists
Dental enamel
Dentistry
Mastication
Medicine
Original
Original Article
Variance analysis
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Summary:Objectives To investigate the two-body wear of occlusal splint materials fabricated from subtractive computer-aided manufacturing (CAM) compared to three-dimensional printing (3DP). Material and methods Forty-eight substrates ( n  = 12/material) in the design of a mandibular first molar were fabricated using CAM (CAM-TD, Thermeo, pro3dure medical GmbH, Iserlohn, Germany; CAM-CL, CLEARsplint, Astron Dental Corporation, Lake Zurich, USA) and 3DP (3DP-GI, GR22 flex, pro3dure medical GmbH; 3DP-KY, KeySplint soft, Keystone Industries, Gibbstown, USA). The substrates were subjected to mastication simulation (120,000 cycles, 37 °C, 50 N, 1.3 Hz) opposed to enamel antagonists. The two-body wear was measured through matching of the scanned substrates before and after aging using Gaussian best-fit method. The damage patterns were categorized and evaluated based on microscopic examinations. Data was analyzed using Kolmogorov–Smirnov test followed by 1-way analysis of variance (ANOVA). Pearson correlation was calculated between vertical and volumetric material loss. The failure types were analyzed with Chi 2 -test and Ciba Geigy table. Results No difference in two-body wear results between all materials was found ( p  = 0.102). Fatigue substrates showed a perforation for CAM and a fracture for 3DP. No abrasion losses on the antagonists were detected. Conclusions 3DP substrates showed no differences in two-body wear compared to CAM ones but are more likely to show a fracture. None of the tested materials caused an abrasion on human teeth structure. Clinical relevance While therapies with occlusal splint materials are rising, 3DP offers a promising alternative to CAM in terms of production accuracy and therapeutic success at reduced costs.
ISSN:1436-3771
1432-6981
1436-3771
DOI:10.1007/s00784-022-04543-5