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At least 829 records · Page 46Linked to original sources
PubMed1990

[Contribution of air computerized tomography of the joint in the assessment of algo-dysfunctional syndromes of the mastication system].

The prospective study of evaluation temporomandibular dysfunction by air computerized tomography of the joint are reported. The authors propose a new injection technique of both articular compartments by CT Scan location. With thin sagittal computed tomography sections, closed mouth and open mouth position, this study is made. Preliminary data from air computerized tomography of the joint imaging show directly the disk with anterior and posterior attachments. The authors present the normal results and major pathology found in the evaluationof temporomandibular dysfunction. CT Scan puncture is more precise. The air computerized tomography imaging of the joint was undoubtedly superior to that of conventional opaque joint tomography, but dynamic notion is much less than in the absence of videoscopy.

Air↗
PubMed1990

[Condylar retrusion in the algo-dysfunctional syndrome of the mastication apparatus].

Although T.M.J. dysfunction-pain syndrome is a multicausal affection, it is obvious that occlusal disturbance is one of the greater etiologic factors. In order to evaluate the role of condylar position in the glenoid fossa, a statistical study has been made on a 16 patients series. These patients presented an uni- or bilateral T.M.J. dysfunction-pain syndrome without arthrosis, ankylosis or traumatologic deformation. The vertical and horizontal relationships of the mandibular condyle to the temporal were quantitatively evaluated from lateral tomographs. Pain and clicking were noted (Y or N) for each of the 32 T.M.J. Condylar position doesn't seem to have any relation with clicking, which is present in cases of meniscus anterior displacement. On the contrary, condylar horizontal retrusion is statistically connected with pain (p less than 0.05) even if one can see condylar retroposition without pain. On the other hand, vertical changes in condylar position cannot be connected with pain. The importance of condylar retrusion in the pain-group can surely be related to inflammatory histologic injuries at the level of the posterior disc attachment. Then, in these cases, the etiologic treatment must be focused on anterior mandibular release by orthodontics, prosthetics or orthognathic surgery.

Adolescent↗
PubMed1989

[Frequency spectra of EMG activities and mastication muscular development].

The purpose of this study was to investigate the change of frequency components of EMG (electromyograph) signals obtained from masticatory muscles in term of the development from deciduous mixed and permanent dentition using FFT (Fast Fourie Transform) algolism. A total of one hundred and fourty subjects who had no oral dysfunction were subjected. The subjects were divided into four groups: deciduous dentition (designated as G1), early mixed dentition (designated as G2), late mixed dentition (as G3) and permanent dentition (as G4). EMG signals were taken from the right masseter and temporal muscles using bipolar surface electrodes during tooth tapping, clenching in the intercupsal position and maximum biting and EMG were recorded on magnetic tape (FM data recorder). Three parameters on the surface EMGs were chosen for the measuring points such as 1) frequency range, 2) frequency of maximum peak (peak frequency), 3) strength of maximum peak (peak magnitude). The results obtained in the present studies were summarized as follows; 1) In the frequency range, temporalis showed a higher range than masseter muscle among every group and it decreased with the dentitional development. 2) As to the peak frequency and peak magnitude, the clenching has higher frequency than tooth tapping and maximum biting, and the those differences between each group were clarified with the development. 3) Cross-powerspectrum showed that the main frequency harmonized into high frequency at every movement, while the strength of the harmony maintained a high frequency and increased with the development of the muscles. As aforementioned, EMG spectra may also reflect on to muscle activities associated with dentitional development.

Dentition, Mixed↗