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  • 1
    Electronic Resource
    Electronic Resource
    Craniomandibular stiffness in myogenous and arthrogenous CMD patients, and control subjects: a clinical and experimental investigation (1996)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 23 (1996), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: summary The purpose of this study was to compare active maximum mouth opening, endfeel distance, and craniomandibular stiffness values of three crani- omandibular disorder (CMD) patient subgroups and a control group. The CMD patient subgroups consisted of myogenous pain patients and arthrogenous pain patients with a ‘closed lock’ and arthrogenous pain patients without a ‘closed lock’. Both myogenous pain patients and the ‘closed lock’ patients showed great differences on all parameters (P 〈 0.05 – P 〈 0.001). However, the arthrogenous pain patients without a ‘closed lock’ revealed no statistical differences with the control group on any of the tested parameters.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1996.tb00867.x
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  • 2
    Electronic Resource
    Electronic Resource
    The immediate effect of splint-induced changes in jaw positioning on the asymmetry of submaximal masticatory muscle activity (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 16 (1989), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Maxillary full-arch splints in the retruded position (RP) and in a right lateral occlusion (1.0- 1.5 mm to the right of the retruded contact position) were fabricated for ten subjects. Surface electromyography of the masseter and anterior temporal muscles was performed during submaximal clenching in order to investigate the immediate effects of the splints on the activity patterns of these muscles relative to the patterns found with the subjects occlusion in the inter-cuspal position. The splints in the RP were found to have no effect on the asymmetry of the activity of the masseter and the anterior temporal muscles, while the splints in a right lateral occlusion resulted in relative increases in right anterior temporal muscle activity (P〈0.005).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1989.tb01329.x
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  • 3
    Electronic Resource
    Electronic Resource
    The recognition of craniomandibular disorders—a comparison between clinical and radiographic findings in eighty-nine subjects (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 15 (1988), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A comparison has been made between clinical and radiographical findings in a study of eighty-nine patients suffering from craniomandibular disorders. In general it was found that condylar changes were more common in these patients than in earlier studies concerning the severe problems of craniomandibular disorders. A statistically significant correlation between clinical and radiographical findings was found for crepitation with osteophyte formation of the condyle (P〈0.01). After clinical separation of the patients into two groups based upon the origin of pain, myogenous versus arthrogenous, no radiographical correlation could be made except for condylar osteophytes. With the clinical method used for separation of patients it was found that the clicking of the temporomandibular joint (TMJ) was more common among myogenous patients (P〈0.05); crepitation was more common among arthrogenous patients (P〈0.01), as was limited mouth opening (P〈0.05) and deviation on opening (P〈0.05). Radiographically, the only statistical difference between the two groups was found for osteophyte formation of the condyle, this was more common among arthrogenous patients (P〈0.05). As the clinical method has been tested earlier, the results of this study lends support to the idea that conventional radiographical examination is of limited use in the initial diagnostics of craniomandibular disorders. Therefore new alternatives have to be developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1988.tb00151.x
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  • 4
    Electronic Resource
    Electronic Resource
    Electromyographic screening of myogenous and arthrogenous TMJ dysfunction patients (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 13 (1986), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Sixty patients, clinically examined for TMJ dysfunction, were also electromyographically screened. The TMJ dysfunction pain in forty patients was evaluated to be mainly of a myogenous origin and in fourteen patients of a mainly arthrogenous origin. Due to lack of findings in the clinical examination six patients were not to be classified into either of the two groups. They were excluded from the EMG study. For the EMG examination the patients were asked to clench for 30 s in the intercuspal position at 50% of the maximum EMG activity of the masseter muscles. Surface electromyograms of the right and the left masseter and anterior part of the temporalis muscles were monitored. The amplitude of the EMG signal, the duration of the silent period and the changes in the frequency composition of the signal during the 30 s contraction were analysed.Statistically significant differences between the two patient groups were found in EMG amplitude and in silent period duration. However, the difference in silent period duration was due to the dependency of the silent period on the activation level of the muscle. No statistically significant difference in silent period was found when this dependency was corrected for in the data. The EMG parameters related to muscular fatigue phenomena did not show any difference between the two groups.The difference in EMG amplitude and consequently the difference in silent period duration support the clinically made distinction into mainly a myogenous or mainly an arthrogenous origin of TMJ dysfunction pain.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1986.tb01305.x
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  • 5
    Electronic Resource
    Electronic Resource
    Relationship of electromyographic parameters in jaw dysfunction patients classified according to Helkimo's index (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 11 (1984), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Forty-two jaw pain-dysfunction syndrome patients (PDS) were divided into three groups depending on the severity of their condition using the Helkimo clinical dysfunction index. For both the left and right masseter and anterior temporal muscles three parameters of their electromyographic activity were measured, the silent period (SP), the root mean square value (RMS) and the mean power frequency (MPF). During the experiments the patients were instructed to clench as hard as possible in the intercuspal position.No statistically significant differences could be found between the values for any of the muscles measured between the different Helkimo clinical dysfunction groups. However, when the affected side was compared with the unaffected side in this patient material, statistically significant longer silent period durations and greater RMS values were found in the masseter muscles of the affected side group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1984.tb00604.x
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  • 6
    Electronic Resource
    Electronic Resource
    Influence of chin tap force and bite force parameters on the duration of the electromyographic silent period (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 11 (1984), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Controversy exists as to whether chin tap force and bite force affect the duration of the electromyographic silent period following the jaw jerk reflex during isometric contraction of the elevator muscles of the mandible.This study demonstrates that statistical trends exist showing increased silent period duration for increased tap forces and decreased silent period duration with increased bite forces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1984.tb00564.x
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  • 7
    Electronic Resource
    Electronic Resource
    Psychological distress in chronic craniomandibular and cervical spinal pain patients (2002)
    Oxford, UK : Blackwell Science Ltd
    Journal of oral rehabilitation 29 (2002), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In chronic craniomandibular disorders, a relationship with psychological distress has often been investigated, with contradictory results. Recent studies on chronic pain patients have shown that the level of psychological distress is related to the number of painful body areas. Therefore, the aim of this study was to analyse differences in psychological distress between craniomandibular pain patients with or without cervical spinal pain, taking the number of painful body areas below the cervical spine also into account. Based on an oral history and, independently performed, dynamic/static tests, the presence or absence of a painful CMD or CSD was recognized. To assess the level of psychological distress, the Dutch version of the Symptom Checklist 90 (SCL-90) was used. The number of painful body areas was indicated on the body drawing of the McGill Pain Questionnaire (MPQ-DLV).From the initial 250 participants, 103 persons could unequivocally be classified as having or not having a painful CMD and/or CSD and fully completed both questionnaires. Patients with both craniomandibular and cervical spinal pain showed higher levels of psychological distress than patients with only local craniomandibular pain and persons without pain (ancova and t-tests, P=0·026–0·000). Further, persons with more painful body areas below the cervical spine showed higher SCL-90 scores (ancova and t-tests, P=0·045–0·000). In conclusion, chronic craniomandibular pain patients with a coexistent cervical spinal pain show more psychological distress than patients with only local craniomandibular pain and asymptomatic persons. (Supported by the IOT)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2842.2002.01026_9.x
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  • 8
    Electronic Resource
    Electronic Resource
    Reproducibility of the normalized electromyographic recordings of the masseter muscle by using the EMG recording during maximal clenching as a standard (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 6 (1979), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A method of normalizing the integrated EMG recordings from the masseter muscles is introduced. For each subject investigated the maximal clenching force is remarkably constant and reproducible. This makes it possible to normalize the integrated EMG recordings to the EMG activity at the maximal clenching force without having to measure this force at the beginning of every experiment. These normalized integrated EMG activities give a good quantitative impression of the static force exerted by the masseter muscle, and therefore can be compared quantitatively over several experiments. The relationship between the normalized integrated EMG activities and the clenching force is linear up to approximately 80% of the maximal clenching force.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1979.tb00404.x
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  • 9
    Electronic Resource
    Electronic Resource
    Masticatory electromyographic activity in healthy young adults and myogenous craniomandibular disorder patients (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: The electromyographic (EMG) activity of the masseter and the anterior temporalis muscles were compared between 60 healthy controls and 61 myogenous craniomandibular disorder (CMD) patients. Subjects were asked to clench at 10% and at 50% of their maximum voluntary clenching level. The effects of CMD, age and gender were statistically analysed with the use of the analysis of covariance. The correlations between EMG asymmetries and the lateral slide from the retruded contact position to the intercuspal position and the asymmetry in the number of post-canine tooth contacts between the left and the right side were investigated.The CMD patients showed lower masseter EMG activities than the controls, whereas the anterior temporalis EMG activity was not different between the two groups. The activity index, relating the anterior temporalis EMG activity to the activity of the masseter muscles, confirmed the presence of a relatively high temporalis activity in the CMD group. No significant differences were found in the EMG asymmetries between the controls and the CMD patients. Males showed higher masticatory EMG activities than females. These gender effects were significant for the anterior temporalis at the 10% and 50% level and for the masseter muscle at the 10% level. The anterior temporalis EMG activity declined with age. No age related effects were observed in the masseter EMG. The lateral slide was larger and more prevalent in the CMD group. A significant correlation between the lateral slide and the anterior temporalis EMG was found for the CMD group at the 10% level. No correlation was found between the EMG asymmetry and the asymmetries in post-canine tooth contacts.In conclusion: significant CMD, age and gender effects were observed in the masticatory EMG activities of a group of myogenous CMD patients and a control group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1994.tb01125.x
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  • 10
    Electronic Resource
    Electronic Resource
    Electromyographic activity of the human masticatory muscles during submaximal clenching in the inter-cuspal position (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of oral rehabilitation 16 (1989), S. 0 
    Details
    ISSN: 1365-2842
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The activity patterns of the masseter and the anterior temporal muscles were studied in twenty-one healthy male subjects while clenching at 10, 20, 30, 40 and 50% of the maximum clenching level. At low clenching levels the temporal muscle activity tended to dominate, at high levels the masseter muscle activity was stronger (P 〈 0.001). The asymmetry in muscle activity also depended upon the clenching level (P 〈 0.001), while at each level the masseter muscle asymmetry was greater than the temporal muscle asymmetry (P 〈 0.05–P 〈 0.025). By comparing the electromyographic activities of the left and right side within each subject it was found that the masseter muscle with the higher electromyographic activity tended to have the larger cross-sectional area (P 〈 0.01) and at the 50% clenching level it tended to be on the side with the greater number of post-canine tooth contacts (P 〈 0.001).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2842.1989.tb01318.x
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