Publications by authors named "R Hampe"
Objective: To compare the fatigue behavior and reliability of 5 pressed lithium disilicate ceramics and a 5 mol% yttria-stabilized zirconia (5Y-TZP) when 3 dynamic loading protocols were used.
Methods: Bar-shaped specimens (30 × 4 × 3 mm) were fabricated from 5 pressed lithium disilicate ceramics (AMB, CEL, INI, IPS, and LIV) and a 5Y-TZP (ZR) (N = 324). Six specimens from each material were subjected to a static 4-point fracture load test, while the remaining specimens were subjected dynamic loading by increasing the starting load (30 % of the static fracture load) in every 5000 cycles by 50 N (loading protocol 1), in every 5000 cycles by 5 % (loading protocol 2) or in every 1000 cycles by 10 N (loading protocol 3) until fracture (n = 16).
Objectives: The aim of this study is to investigate the influence of the material and corresponding sintering protocol, layer thickness, and aging on the two-body wear (2BW) and fracture load (FL) of 4Y-TZP crowns.
Materials And Methods: Multi-layer 4Y-TZP crowns in three thicknesses (0.5 mm/1.
Article Synopsis
- High-speed sintering is an efficient method for creating aesthetic dental restorations, but there's limited data on how it affects the fatigue strength of 4Y-TZP ceramics.
- This study aimed to investigate how high-speed sintering and the type of preshading (monochrome vs. multilayer) influence the fatigue behavior of these ceramics through various dynamic tests.
- Results indicated that the multilayered 4Y-TZP exhibited better fatigue performance than the monochrome version, but high-speed sintering seemed to have a negative impact on the overall fatigue behavior, with no significant deterioration when compared to conventionally sintered materials.
Objective: To test the impact of three varying step-stress protocols on the fatigue behavior of two 3Y-TZP, one 4Y-TZP and one 5Y-TZP zirconia materials.
Methods: Eight specimens per zirconia material (N = 32) were selected for static testing to determine the start load for dynamic tests (30% of the mean value of static fracture load). 45 specimens per material (N = 180) were used for dynamic load tests using three step-stress protocols: 1.
Fatigue resistance of monolithic strength-gradient zirconia materials.
J Mech Behav Biomed Mater
July 2021
Purpose: Evaluation of the effect of three different dynamic fatigue protocols on the fracture resistance of two monolithic strength-gradient zirconia materials.
Materials And Methods: A total of 240 specimens (3 × 4 × 45 mm) was milled from two different layers (incisal and middle) of two types of strength-gradient zirconia blanks (IPS e. max ZirCAD MT Multi A2 vs.