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  • 1
    Electronic Resource
    Electronic Resource
    Relationship between autoregressive model coefficients of EMG and its potentials of jaw closing muscles at rest position and clenching (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 19 (1992), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: At rest position and varied clenching levels at intercuspal position, autoregressive (AR) models of myoelectrical activities of both masseter and anterior temporal muscles of 11 healthy subjects with intact natural dentitions were established. The relationship between the AR model coefficients of surface EMGs and their potentials was analyzed by multiple linear regression. It was found that the fourth order coefficient of AR had the greatest effect on the EMG potential levels and their relationship was positive in all recorded muscles. The results indicate the AR coefficients may become a characteristic parameter to describe myoelectrical activity of jaw closing muscles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1992.tb01115.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Correlation between autoregressive moving-average model parameters of electromyogram of human jaw closing muscles and maximum clenching time at intercuspal position (1994)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 21 (1994), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: During maximum clenching in the intercuspal position, surface electromyograms of left masseter and anterior temporal muscles were sampled in 16 healthy subjects with natural dentitions to establish a four-order, autoregressive (AR) moving-average (MA) model of the myoelectrical signals. The correlation coefficients and the linear regresssion between the model parameters and the clenching time were calculated. The model parameters had the positive or the negative correlation, and AR model parameters had the higher correlation than MA model parameters. The model parameters relate to muscular fatigue and the slope of the regressive equation relates to the endurance time of the isometric contraction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1994.tb01170.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Relationship between mean power frequency and potential of human masticatory muscles at rest position and clenching (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 20 (1993), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The EMG signals from left and right masseter and anterior temporal muscles of 40 healthy subjects were sampled at rest position and through gradually increased clench level to maximum voluntary contraction (MVC) at intercuspal position. A visual sense feedback of masseter muscle potential value was used for the subject to control clench level. The relationship between mean power frequency (MPF) and potential of EMG was investigated by a curvilinear regression of the second order. It was found that the relationship was of the second order logarithmic curve with maximum value of MPF. With the raising of the potential levels of EMG, the MPF increased at the lower clench levels and decreased at higher clench levels. The results indicate that controlling an identical clench level is necessary for using MPF to describe the functional state of masticatory muscles in the clinical situation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1993.tb01612.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Elementary identification of a gnathosonic classification using an autoregressive model (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 20 (1993), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This was an investigation to determine the feasibility of an autoregressive (AR) model for establishing characteristic parameters from recorded occlusal sounds and develop their classification. Thirty four normal subjects with intact natural dentitions were selected for the study. The subjects’ occlusal sounds from both sides of their faces respectively were sampled, and the gnathosonic classification (Class A, B and C) was established by observing the original recorded wave pattern and measuring the duration. Then, a 20 order AR model was calculated with the collected data, and the AR model coefficients were found to be similar to the indices of Bayes’ discriminatory analysis. The total conformation rates of the modelled left and right occlusal sounds to the classification, estimated by Bayes’ discriminant functions were 97.06% and 88.24% respectively. AR coefficients representing the characteristics of human occlusal sounds can be helpful in their classification and allow computer diagnosis of occlusal disorders.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1993.tb01620.x
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Discrimination of clenches at varied jaw positions using autoregressive model coefficients of myoelectrical activities of anterior temporal and masseter muscles (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 19 (1992), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: During 10% maximum clenching at intercuspal, protruded, retruded contact and lateral positions, the surface electromyograms (EMG) of bilateral anterior temporal and masseter muscles of 20 normal subjects with intact natural dentitions were recorded. The autoregressive (AR) model of the sampled EMG was then built and the obtained coefficients of the AR model were accepted as featured parameters of the EMG. Finally Bayes' stepwise discriminant analysis was used for establishing discriminant functions of estimating low level clenches at varied jaw positions. It was found that total conformation rates of internal and external sample substitution (15 and 5 subjects) were 82.67% and 78% respectively; the discriminant effect between intercuspal and retruded contact position was not up to predicted standard. The results indicate that AR model coefficients may describe the characteristics of surface EMG of masticatory muscles and easily be used in multiple statistical analysis, from which the classification and diagnosis may be taken.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1992.tb01109.x
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Observation of proportionality of myoelectrical activity of anterior temporalis to masseter muscle during clenching at varied jaw positions (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 19 (1992), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Twelve healthy subjects with an intact permanent dentition and normal occlusion were selected for sampling of myoelectrical activity of their left and right anterior temporal and masseter muscles during habitual clenching level in varied positions. The proportionality of normalized myoelectrical potentials of anterior temporal muscle to masseter muscle at ICP and RCP was greater than one, while the proportionality at PP was less than one. In the lateral position, the proportionality on the working side was approximately equal to that at RCP, while the proportionality on the non-working side was similar to that at PP. These results suggest that temporal muscle contraction can bring the mandible upward and backward whilst the masseter muscle can elevate the mandible upward and forward.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1992.tb01118.x
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Special luminescence properties of BaF"2 crystals
    Amsterdam : Elsevier
    Journal of Luminescence 40-41 (1988), S. 189-190 
    Details
    ISSN: 0022-2313
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0022-2313(88)90151-2
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    Paper (German National Licenses)
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