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  • 1
    Electronic Resource
    Electronic Resource
    Spaciostructural analyses of mandibular and perioral soft tissue movements during mastication (2001)
    Oxford UK : Blackwell Science Ltd
    Journal of oral rehabilitation 28 (2001), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: We considered that elucidation of the movements of perioral soft tissues during mastication would be useful in evaluating masticatory movements. However, evaluation of movements specific to soft tissues is difficult because movements of the surface of the lower face during mastication include movements of the muscles of facial expression and mandibular movements. The aims of this study were to elucidate the influence of mandibular movements on perioral soft tissue movements during mastication using principal component analysis (PCA) and to abstract the component of movement specific to soft tissues in order to evaluate masticatory movements from the movements of perioral soft tissues. The subjects were 10 healthy persons with complete natural dentition. The experimental food used in this study was sufficiently softened chewing gum. The results of this study showed that the movements of mandibular and perioral soft tissue were closely related in the first and third PCs; in other words, the second PC was the component of movement specific to soft tissues. Thus, elucidation of the second PC is useful for evaluation of masticatory movements from movements of perioral soft tissues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.2001.00751.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The dynamic behaviour of a lower complete denture during unilateral loads: analysis using the finite element method (2001)
    Oxford UK : Blackwell Science Ltd
    Journal of oral rehabilitation 28 (2001), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The purpose of this study was to analyse the correlation between the location and/or direction of unilateral load and the dynamic behaviour of a mandibular complete denture using the three-dimensional finite element method (FEM). The FE model consisted of the body of mandible, alveolar mucosa, and a complete denture, and it could simulate the condition of contact between the surface of the mucosa and mucosal surface of a denture. Load vectors, which simulated premature contacts, were calculated on the supposition that a premature contact on an occlusal facet causes a vertical load on it. Load-A, a load vertical to the anterior occlusal facet, caused the least displacement of the denture and less concentrated stress distribution. Load-P, a load vertical to the posterior occlusal facet, was characterized by the stress distributed in the lingual area of the pre-molar lesion on the contra-lateral side of the load. Load-B, a load vertical to the balancing occlusal facet, caused the largest displacement of the denture. The relationship between loads and stress distribution was agreed approximately with the observations previously reported, and lead to some suggestions about occlusion for complete dentures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.2001.00759.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Time-series analyses of mandibular and perioral soft tissue movements during mastication (2003)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 30 (2003), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: summary  Masticatory movements are rhythmically repeated and coordinated movements of the jaw, tongue and facial muscles. Thus, we considered that the elucidation of movements that are specific to perioral soft tissue, as a result of perioral facial muscle activities, should be useful for evaluation of the smoothness of masticatory movements. The aim of this study was to evaluate the smoothness of masticatory movements from the component of movements that are specific to perioral soft tissue during mastication by the application of time-series analysis. The subjects were 15 healthy persons with complete natural dentition. The experimental food used for mastication in this study was sufficiently softened chewing gum. The results showed that the component of movements that are specific to perioral soft tissue during mastication are the equal repetition spatially and stable movements temporally, and that these movements have the same accurate rhythm as that of mandibular movements and cooperate with mandibular movements temporally. Moreover, the results suggested, from the viewpoint of kinematics, that the innervation of the central pattern generator was concerned with the neural basis of rhythm generation of perioral facial muscles. Therefore, the component of movements that are specific to perioral soft tissue during mastication is useful for evaluation of the smoothness of masticatory movements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.2003.00962.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Biaxial extensional flow behavior of monodisperse polystyrene melts (1995)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 46 (1995), S. 267-270 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Biaxial extensional flow behavior of monodisperse polystyrene melts has been investigated by using a lubricated squeezing flow method at constant strain rates. Master curves for the biaxial stress growth coefficient ηB+ are obtained by applying the time-temperature superposition principle. The coefficient ηB+ deviates from a linear viscoelastic curve at very small strain such as 0.1, and then approaches a quasi steady state. The quasi-steady-state viscosity ηB,qs decreases with the strain rate ηB. At very small strain rates, the coefficient ηB+ increases again after the quasi steady state and becomes much larger than the linear viscoelastic curve. The strain rate dependence curves of ηB,qs obtained for different molecular weight samples can be superposed to give a super master curve using the weight-average relaxation time η0 as a reducing parameter. It is found that the biaxial viscosity ηB,qs begins to decrease at much smaller reduced strain rate (∊Bτ0=0.01) compared with the shear viscosity, which begins to decrease at reduced strain rate of about 1.0.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1995.010460309
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    Paper (German National Licenses)
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