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Biomedical subjects

F Mongini

Publications and source records attributed to F Mongini.

At least 37 records · Page 2Linked to original sources
PubMed1989

[Analysis of mastication in normal and dysfunctional subjects].

A computer based system to asses mandibular movements and EMG masseter and temporal muscle activity during habitual mastication was applied to 12 healthy subjects and to 86 dysfunctional subjects, the chewing performance was tested with a standardized bolus of crispy bread. A Siemens Sirognathograph instrument was used to record mandibular movements, while EMG signals were recorded with surface Ag/AgCl electrodes. The Dysfunction Index System was used to build two subgroups of patients with severe TMJ impairment (n = 21) and severe muscle dysfunction (n = 15) respectively. Data on the different parameters of mastication were obtained for the single patients, the whole group and the two subgroups were statistically compared together with those obtained from normal individuals.

Adolescent↗
PubMed1989

Habitual mastication in dysfunction: a computer-based analysis.

To study the different parameters of habitual mastication in stomatognathic dysfunction, mandibular movements and electromyographic activity of the elevator muscles were recorded during three chewing sequences in 86 dysfunctional subjects. The Dysfunction Index system was used to treat two subgroups, patients with severe temporomandibular joint impairment and patients with severe muscle dysfunction. Data on the different parameters of mastication from the single patients, the whole group, and the two subgroups were statistically assessed and compared with those from 12 normal individuals. The following conclusions were drawn. (1) In dysfunctional patients the normal symmetrical and balanced distribution of the chewing cycles is lost and movements are more restricted. (2) The electromyographic data show marked alterations with a tendency to reduce or suppress the isometric phase of contraction during closing in the temporomandibular joint patients. This can be viewed as a defensive mechanism of the impaired system. (3) The data at hand are helpful in explaining some of the mechanisms that lead to muscle pain in dysfunctional patients.

Electromyography↗
PubMed1986

Computer-based assessment of habitual mastication.

A computer-based system to assess mandibular movements and EMG masseter and temporal muscle activity during habitual mastication was applied to 12 healthy subjects and the chewing performance was tested with a standardized bolus of crisp bread. A Siemens Sirognatograph instrument was used to record mandibular movements while EMG signals were recorded with surface silver-silver electrodes. Software provided data of single chewing cycles in space and versus time, of mean mandibular displacement during opening and closing, mean velocity, and EMG activity. Clockwise and counterclockwise cycles were computed separately. The data obtained allow the following conclusions: Habitual mastication is a rhythmic event with different envelopes of motion that alternate characteristically in each subject. Each chewing cycle accomplishes several tasks but, depending on its envelope, is probably more oriented to a specific performance. A mean chewing cycle can be constructed for each individual. Its pattern depends on the distribution of different envelopes of motion that alternate during the masticatory sequence. During closure, a prevalently isotonic and a prevalently isometric phase of muscle contraction can be distinguished. Mean movement and EMG data for the whole group are not distributed at random, but according to a typical pattern. The system seems to be finalized to a well-balanced function and distribution of loads.

Adolescent↗
PubMed1982

Assessment of the therapeutic position for orthodontic diagnosis and treatment.

The authors discuss the influence of mandibular displacement in intercuspal position (ICP) on orthodontic planning and treatment. The correct therapeutic position in orthodontics should be assessed on the basis of clinical and radiographic parameters. Posteroanterior cephalograms can be of great diagnostic value; deviation from the norm of some measurements is highly indicative of a mandibular displacement in ICP. A repositioning occlusal splint is then constructed in the therapeutic position before the definitive orthodontic treatment is started; the splint should lead to improvement of the clinical and cephalometric data.

Adolescent↗
PubMed1982

Factors influencing the pantographic tracing of mandibular border movements.

Three studies were performed to evaluate the influence of anatomic and neuromuscular factors of pantographic tracings of mandibular border movements. In the first study, the tracing of 50 patients with TMJ and/or muscular dysfunction were made, and the data correlated with the clinical and radiologic findings. In the second study, the tracing of 20 patients were compared before and after therapy. In the third study, the tracing of 20 patients were evaluated before and after a relaxation session with biofeedback. The data showed that both articular and neuromuscular factors influence the tracing pattern. Internal derangements of TMJ, as well as muscle spasm, lead to typical tracings. The neuromuscular factor can be dramatically improved by relaxation with biofeedback. Repeated pantographic tracings before and during treatment may help in diagnosis and in the evaluation of treatment.

Adolescent↗
PubMed1982

Combined method to determine the therapeutic position for occlusal rehabilitation.

Differences of opinion concerning the correct reference position for occlusal rehabilitation and the correct methods for diagnosis are partly due to the tendency to overemphasize either the clinical or radiologic approach. However, careful comparison of data from radiography, clinical examination, and occlusal analysis offers the best opportunity for correct diagnosis and treatment. A combined method has been described for the determination of mandibular displacement in the IP and the correct reference position for occlusal rehabilitation. Integration of data from radiology, clinical examination, and occlusal analysis allows location of the condyles and the lower midline, thus providing the best opportunity for a correct diagnosis. The selected therapeutic position is then achieved at the beginning of treatment through a splint constructed on casts mounted on an articulator.

Dental Occlusion, Balanced↗
PubMed1981

The importance of radiography in the diagnosis of TMJ dysfunctions. A comparative evaluation of transcranial radiographs and serial tomography.

Eight men and 22 women with TMJ pain-dysfunction syndrome were selected. After clinical examination, TR and serial tomography were performed in 5 to 7 different planes. In 27 patients, TR showed a condylar displacement. This was confirmed by serial tomography, which also showed that the apparent position may vary from the medial to the lateral aspects due to rotation in some patients. Changes in shape were a common feature and did not necessarily occur in the same manner on each side or in the different sections of the same condyle. In these patients, the TR shape was generally more similar to that of the middle and lateral tomographic planes. The relationship between remodeling pattern and condylar position was confirmed. Degenerative lesions were present in some patients but could only be clearly detected by serial tomography. This study confirms the important role of the TMJ in dysfunctions and the validity of radiography in diagnosis.

Adolescent↗
PubMed1980

Condylar remodeling after occlusal therapy.

Seven men and 15 women with TMJ pain dysfunction syndrome were selected. After clinical examination, polytomography of the TMJ was performed in centric occlusion in different planes. Open-mouth projections were also made in three patients, frontal tomography in one patient, and transcranial radiographs in 16 patients. Occlusal analysis was performed on the articulator. Twenty patients showed various patterns of condylar displacement with flattening of the anterior, superior, or posterior condylar walls in 11 patients, including three with arthritic lesions. Therapy included occlusal splints (21 patients), selective grinding (seven patients), prosthodontic rehabilitation (10 patients), and orthodontic treatment (two patients). After therapy, tomographic examination was repeated at intervals of 9 to 44 months. A distinct reshaping of the condyle was seen in seven patients. The new shape tended to be rounded. The three patients with degenerative changes before treatment showed regression of the lesions. No change was seen in condyles which were rounded before therapy.

Adolescent↗
PubMed1980

Relationship between the temporomandibular joint and pantographic tracings of mandibular movements.

Lateral polytomography of the TMJ and pantographic tracings of mandibular movement were performed in 30 patients with TMJ pain-dysfunction syndrome. The condyles were classified as rounded or flattened. The articular eminences were classified as convex or flattened. Two types of immediate side shift, progressive side shift and vertical protrusive tracing, were observed. Type A was curved, Type B was straight. A significant relationship was found between the shape of the TMJ and the tracing pattern. Type A immediate side shift (when present), progressive side shift, and vertical protrusive tracings were more typical of patients with rounded condyles and convex articular eminences. Type B was typical of patients with flattened condyles and, to a lesser extent, flattened articular eminences. Superior displacement of the rotating condyle was found only in patients with flattened condyles.

Adult↗
PubMed1979

Relationship between structure and the stress pattern in the human mandible.

The internal bony structure of ten dentate human mandibles was examined on lateral radiograms, and the condylar shape measured with a digital electronic machine. The external surface was coated with photoelastic material. Each mandible was then placed in centric occlusion with brass replicas of the upper arch and the glenoid fossae and set in a supporting frame. Occlusal loads were simulated and the isoclinics recorded in plane-polarized light. The isostatic flow lines were constructed for each mandible. A relation was found between the mandibular structure and the distribution pattern of these lines.

Adult↗
PubMed1977

Anatomic and clinical evaluation of the relationship between the temporomandibular joint and occlusion.

An anatomic and clinical investigation of condylar remodeling; the position of the condyle in centric occlusion; and the relationships of these two factors to each other and to the features of the dentition are reported. Two groups of 100 adult crania were examined. The first group had complete or partially edentulous arches. In the second group, the dentition was complete and there were various degrees of abrasion. In addition, clinical and tomographic data were obtained from 70 patients with temporomandibular joint pain-dysfunction syndrome. Occlusion was also studied by intraoral registration of the gothic arch and by mounting the casts on an articulator in 40 patients. Comparison of the data made it clear that occlusal conditions determine the course of condylar remodeling and lead to marked changes in shape of the joints. Occlusal disorders are also responsible for condylar displacement (noted in 51.4 per cent of patients), which, in turn, may be the cause of typical reshaping of the joint. These findings cast doubt on the proposition that the gnathologic determinants (particularly centric relation) are never changed in the course of time.

Adolescent↗