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Efficacy of a posterior implant support for extra shortened dental arches: a biomechanical model analysis (2005)

MAEDA, Y. ; SOGO, M. ; TSUTSUMI, S.

Oxford, UK : Blackwell Science Ltd

Journal of oral rehabilitation 32 (2005), S. 0

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ISSN: 1365-2842

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Medicine

Notes: summary The purpose of this study was to test the efficacy of utilizing implants underneath distal free-end denture bases to establish a stable occlusal support for extreme shortened dental arches (ESDA). The authors constructed a two-dimensional finite element model of the ESDA where only lower anterior teeth remain. Posterior occlusal support was provided by a fixed partial denture with an osseointegrated implant (IFPD), fixed cantilever partial denture (CFPD), or a removable partial denture with or without an implant underneath (IRPD and RPD). A dentate mandible model was the control. When muscle vectors simulating clenching force were applied, stress levels on the temporal bone surface area under each configuration were compared, to evaluate the efficacy in establishing the occlusal support. The largest stress increase in temporal bone was found in the ESDA situation followed by the RPD. The least amount of stress increase was found with the IFPD followed by IRPD when the implant was placed in the molar region. The stress increase with IRPD was about 20–45% of the amount with RPD. Our results suggest that IFPD provides most favourable and stable occlusal support, however, IRPD with a single posterior implant also provide stable occlusal support with reducing the stress levels in the temporomandibular joint

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1365-2842.2005.01478.x

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Effect of Humidity on Fatigue Strength of Squeeze Cast Al Alloy (2008)

Sofuku, Y. ; Kawagoishi, Norio ; Adachi, M. ; [et al.]

s.l. ; Stafa-Zurich, Switzerland

Key engineering materials Vol. 385-387 (July 2008), p. 397-400

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ISSN: 1013-9826

Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Fatigue properties of a squeeze cast Al-Si-Mg alloy were examined under rotating bendingand the effect of humidity on the crack initiation and propagation behavior was investigated incontrolled humidity. The fatigue strength was decreased in high humidity (RH85%) in comparisonwith the one in low humidity (RH25%). Cracks initiated at the early stage of fatigue life from slipbands and eutectic Si particles in many cases and partially casting defects, and most of fatigue life wasoccupied by the growth life of a small crack regardless of humidity. The propagation of a crack werepromoted by humidity, especially the growth rate of a crack larger than about 100 µm, whichpropagated in tensile mode, was strongly accelerated