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Contact Fracture Test of Monolithic Hybrid Ceramics on Different Substrates for Bruxism by Ting-Hsun Lan; Ping-Ho Chen; Alex Siu Lun Fok; Yu-Feng Chen is a Dentistry article available to read on EtoBox.

What is Contact Fracture Test of Monolithic Hybrid Ceramics on Different Substrates for Bruxism about?

Objectives: To determine the minimum thickness required for a monolithic hybrid ceramic crown on different substrates (soft vs stiff) used in posterior dentition for bruxism. Methods: 80 polymer-infiltrated ceramic networks Vita Enamic (PICN VE) disc specimens with four different occlusal thicknesses (0.8, 1.2, 1.6 and 2.0 mm), were produced using a computer-aided design/manufacturing system, and cemented on a stiff (zirconia) or soft (polyamide) substrate of 4-mm thickness. The ten specimens, in soft or stiff groups, were subjected to compressive loading by a MTS machine until fracture or maximum load (4500 N) was reached. The unbroken specimens were examined using optical coherence tomography. Eight axisymmetric finite element models and eight 3D models comprising the four different occlusal thicknesses and two substrates under different vertical loads and sliding movements were constructed. The maximum principal stress was selected to evaluate the stress distribution in this study. ## Results: The fracture resistance of the specimens was significantly different between the two substrates (P < 0.001). Fracture resistance was positively associated with specimen thickness (r = 0.59

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Author

Ting-Hsun Lan; Ping-Ho Chen; Alex Siu Lun Fok; Yu-Feng Chen

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Dentistry (Health Sciences)