Journal article

Publication year: 2019

Pages: 368-373

Journal: Journal of Prosthodontic Research

Volume number: 63

Issue number: 3

ISSN: 1883-1958

eISSN: 2212-4632

DOI Link: https://doi.org/10.1016/j.jpor.2019.02.003

Publisher: Elsevier

Abstract: 

Purpose: To analyse fatigue damage of monolithic computer-aided-designed/computer-aided-manufactured (CAD/CAM)-materials after loading with high masticatory forces in standardized posterior crowns in a mouth-motion-simulator.

Methods: For manufacturing of test specimens (5 groups, 16 specimens each), two corresponding Standard-Tessellation-Language-(STL)-data-sets (one for the teeth and one for the crowns) were designed. The teeth were CAD/CAM-milled of human third molars and the crowns of three different CAD/CAM composite blocks (Lava Ultimate,'LU'; Brilliant Crios'BC'; Cerasmart,'CS'), one polymer-infiltrated-ceramic network (Vita Enamic,'VE') and a control group of lithium disilicate ceramics (IPS e.max CAD,'EM'). Crowns were adhesively cemented with their corresponding luting system on the human teeth. Half of the specimens were light-cured ('LC') and the others were chemical-cured ('CC'). A mouth-motion-simulator (WL-tec, 2 Hz, 37 degrees C) applied dynamic cyclic loading between 50-500 N for a period of 1 million cycles. Afterwards, a dye penetration test (aqueous basic-fuchsine) revealed damage of test specimens. Each specimen was sectioned into four equidistant slices and the area without damage was measured with a digital microscope (Zeiss) and radial cracks at the cementation surface were assessed. Data were subjected to Tukey's test.

Results: All specimens showed fatigue damage in the occlusal contact area. LU, BC and CS exhibited a significant greater area without damage compared to VE and EM (p <.05). EM and VE showed additional radial cracks at the cementation interface in both curing modes, whereas LU, BC and CS showed only radial cracks with chemical-cured luting cement.

Conclusions: Monolithic CAD/CAM composite crowns showed significantly lower fatigue damage, particularly if the luting system was light-cured. (C) 2019 Japan Prosthodontic Society. Published by Elsevier Ltd. All rights reserved.

Harvard Citation style: Schlenz, M., Schmidt, A., Rehmann, P. and Woestmann, B. (2019) Fatigue damage of monolithic posterior computer aided designed/ computer aided manufactured crowns, Journal of Prosthodontic Research, 63(3), pp. 368-373. https://doi.org/10.1016/j.jpor.2019.02.003

APA Citation style: Schlenz, M., Schmidt, A., Rehmann, P., & Woestmann, B. (2019). Fatigue damage of monolithic posterior computer aided designed/ computer aided manufactured crowns. Journal of Prosthodontic Research. 63(3), 368-373. https://doi.org/10.1016/j.jpor.2019.02.003