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Biomedical subjects

K Saratani

Publications and source records attributed to K Saratani.

7 recordsLinked to original sources
PubMed1996

Development and validation of TMJ viscoelasticity analyzer.

We developed a TMJ viscoelasticity analyzer for non-invasive evaluation of the soft tissues of the TMJ region. We used this device to measure the viscoelastic parameters, viscosity (c), elasticity (k) and mass (m), of the TMJ region for two volunteers. Experiments were performed to determine the optimum measurement conditions for the preload magnitude, head posture and clenching level. We determined measurement variability and carried out statistical analysis by analysis of variance (ANOVA). We found that the values for c and k varied significantly depending on preload magnitudes (p < 0.001). In addition, all parameters varied significantly depending on head posture. However, clenching level did not significantly affect any of the parameters. Measurement variability was below 10% for all parameters. Examination of viscoelasticity of the TMJ region provides valuable information about functional and pathological changes in the soft tissues of this area. In this study, we were able to determine the fundamental characteristics of the TMJ viscoelasticity analyzer and develop methods for examining patients with temporomandibular disorders.

Analysis of Variance↗
PubMed1990

[The balance of occlusal contacts during intercuspation using T-scan system].

Many methods have been clinically applied for the occlusal analysis in the intercuspal position. However, none of these methods are quantitative. This study described the new software version of the T-Scan system to record and analyze occlusal contact balance in the anterior-posterior and right-left directions. Six time moment statistics and five force moment statistics were calculated in the midsagittal and the incisal axes of the occlusal plane. In the present study, informed consent was obtained from 60 subjects with natural dentitions and from two patients with craniomandibular disorders. In normal subjects, the time moments and the force moments of occlusal contacts were symmetrical about the midsagittal axis of occlusal plane. The location of the center of effort for the antero-posterior occlusal contacts, which was measured from the incisal axis of occlusal plane, was also in the first molar region. However, any of the above mentioned statistics was abnormal in the patients with craniomandibular disorders.

Dental Occlusion↗
PubMed1990

[Deep temperature of the temporomandibular joint region at rest].

This study was made to measure non-invasively the deep temperature of the temporomandibular joint [TMJ] region at rest. The transcutaneous probe making use of zero-heat-flow method was utilized for the deep thermometry. The following results were obtained. 1. In 20 normal male subjects, no differences of the deep temperature were recognized between the right and the left TMJ regions. 2. In 10 patients with temporomandibular disorders, the deep temperature of the symptomatic TMJ side was significantly higher than that of asymptomatic side.

Body Temperature↗
PubMed1990

Automatic diagnosis system of tooth mobility for clinical use.

The examination of tooth mobility gives valuable clinical findings on pathological change in the periodontium. An automatic diagnosis system has been developed for the quantitative evaluation of tooth mobility. Tooth mobility was determined from the vibration characteristics of the periodontium and expressed in terms of such objective biomechanical parameters as stiffness and two damping coefficients. These were displayed on a monitor CRT as a triangular figure. This system is composed of a probe, which comprises a vibrator and acceleration transducers, and a data analysis unit using a personal computer. A dentist can measure the tooth mobility without assistance with a foot-switch to trigger the computer operation. The reliability and the operational facility of the system are considered to be sufficient that it may be used in daily clinical practice. Data were collected from healthy and pathological teeth. The tooth mobility of the pathological tooth and the time course of the change in the mechanical parameters after implantation of the tooth were measured by this system. The advantages of this system compared with previous one, which was also developed by the authors, are discussed.

Adult↗
PubMed1989

Application of mechanical mobility of periodontal tissues to tooth mobility examination.

Tooth mobility examination is important in planning dental treatment, as it may give an indication of alveolar bone loss and the condition of the periodontal ligament. In clinical dental diagnosis a manual tooth mobility examination is useful. However, its determination of tooth mobility is subjective and depends on the skill and experience of the clinician. The authors have previously reported on a device for measuring the biomechanical properties of human periodontium using an impedance head. Using this device, the mechanical mobility of periodontium can be measured and the mechanical parameters of the periodontal physical model are obtained. Tooth mobility is defined objectively on the basis of discriminant scores of mechanical parameters, and a mobility triangle (MT) figure is drawn as a record for visual interpretation. The paper describes the validation of the mechanical mobility measurements and their interpretation using mobility parameters and a personal computer to produce a mobility triangle figure. The method is compared favourably with clinical mobility measurement. The relationship of the model to underlying pathology is tested by measurements performed on various tooth model systems.

Biomechanical Phenomena↗