Rubber accelerated ageing life prediction by Peck model considering initial hardness influence

2019 ◽  
Vol 80 ◽  
pp. 106132
Author(s):  
Qiaobin Liu ◽  
Wenku Shi ◽  
Zhiyong Chen ◽  
Kunheng Li ◽  
Helong Liu ◽  
...  
Keyword(s):  
Life Prediction ◽  
Accelerated Ageing ◽  
Initial Hardness

Evaluation of Hardness and Colour Change of Soft Liners after Accelerated Ageing

2009 ◽  
Vol os16 (3) ◽  
pp. 127-130 ◽  
Author(s):  
Daniela Nardi Mancuso ◽  
Marcelo Coelho Goiato ◽  
Bruna Carolina Rossatti Zuccolotti ◽  
Amália Moreno ◽  
Daniela Micheline dos Santos
Keyword(s):  
Statistical Analysis ◽  
Colour Change ◽  
In Vitro Study ◽  
The Other ◽  
Accelerated Ageing ◽  
Colour Scale ◽  
Initial Hardness ◽  
Denture Liners ◽  
Major Consideration

Introduction Soft liners have been developed to offer comfort to denture wearers. However, this comfort is compromised when there is a change in the properties of the material, causing colour change, solubility, absorption and hardening. These characteristics can compromise the longevity of soft liners. Aim The aim of this in vitro study was to investigate the effect of ageing on both the hardness and colour change of two soft liners following accelerated ageing. Methods Two denture liners, one resin based (Trusoft, Bosworth, Illinois, USA) and one silicone based (Ufi Gel P, Voco GMBH, Cuxhaven, Germany), were tested in this study for both hardness (using the Shore A scale) and colour change (using the CIE L*a*b* colour scale), initially and after 1008 hours (6 weeks) of accelerated ageing. Statistical analysis was performed using the unpaired t-test with the Welch correction. Results These indicated that both materials increased in hardness and underwent colour change after accelerated ageing. The initial hardness of Trusoft was far lower than that of Ufi Gel P (18.2 Shore A units vs 34.8 Shore A units). However, for Trusoft the changes for both hardness (from 18.2 to 52.1 Shore A units) and colour change (16.85 on the CIE L*a*b* colour scale) were greater than those for Ufi Gel P, for which hardness changed from 34.8 to 36.5 Shore A units and the colour change was 5.19 on the CIE L*a*b* colour scale. Conclusions Ufi Gel P underwent less hardness and colour change after accelerated ageing than Trusoft. On the other hand, the use of Trusoft may be preferable in cases where initial softness is a major consideration, such as when relining an immediate denture after implant surgery.

Dynamic Modeling and Wear-Based Remaining Useful Life Prediction of High Power Clutch Systems

2005 ◽  
Vol 48 (2) ◽  
pp. 208-217 ◽  
Author(s):  
Matthew Watson ◽  
Carl Byington ◽  
Douglas Edwards ◽  
Sanket Amin
Keyword(s):  
Dynamic Modeling ◽  
High Power ◽  
Life Prediction ◽  
Remaining Useful Life ◽  
Useful Life

Control of fungal contamination in the accelerated ageing test of Brassica spp.

2007 ◽  
Vol 35 (2) ◽  
pp. 380-386
Author(s):  
C.F.R. Leeks ◽  
J.G. Hampton ◽  
B.A. McKenzie ◽  
M. Dehghan-Shoar
Keyword(s):  
Accelerated Ageing ◽  
Fungal Contamination ◽  
Ageing Test ◽  
Brassica Spp
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