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Biomedical subjects

M Kitoh

Publications and source records attributed to M Kitoh.

24 records · Page 2Linked to original sources
PubMed1978

A biomathematical study on implant design and stress distribution.

Three types of implant were simulated by the two-dimensional finite element method using the mechanical properties of human mandible and implant material as input data. Type 1 was a blade implant, type 2 was blade implant with subperiosteal wings in buccolingual direction, and type 3 was subperiosteal implant with no blade. The effect of bucco-lingual subperiosteal wings in decreasing the stress concentration around the neck portion of the blade implant was investigated under three kinds of occlusal force. In conclusion, the greatest stress concentration was observed at the cortical bone around the neck portion of T-1 blade implant. It was effective in decreasing the stress concentration at this neck portion to change the implant design from T-1 to T-2 or T-3.

Blade Implantation↗
PubMed1977

Mechanical behavior of tooth, periodontal membrane, and mandibular bone by the finite element method.

Simulation of the human tooth, periodontal membrane, and mandibular bone was attempted basing on the anatomical form and dimension, and the experimental data of each component were examined by the two-dimensional finite element method. Following problems were investigated: (1) Which of two factors, elastic modulus or Poisson's rate, in periodontal membrane played an important role for supporting the tooth, and (2) Characteristics of tooth and alveolar bone displacement, and stress distribution in periodontal membrane and mandibular bone were investigated under a definite condition. It is clarified that Poisson's ratio plays a much important role than the elastic modulus and this method is more suitable for simulating the model equivalent to human body and for examining the internal stress and it's displacement than the strain gauge and photoelastic method.

Dental Stress Analysis↗
PubMedDate not supplied

Simultaneous EEG-VTR and transverse topographical analyses of absence seizures in children. Some prognostic implications.

The clinical symptoms and electroencephalographic (EEG) features of typical absence seizures, including transverse topographical analysis (TTA), were studied retrospectively using a simultaneous EEG-VTR system in 36 children aged between 3 and 17 years. Complex absences were more common than simple, and oral automatisms were the most frequent complex symptoms. Occurrence of complex symptoms was directly proportional to the length of seizures. There was no association between lateral TTA type and simple absences. Prognosis was favorable in patients with long seizure duration (P < 0.01), bilaterally synchronous monomorphic spike-waves throughout the seizure discharges (BSMTSD) (P < 0.005) and lateral TTA type (P < 0.05). Two different mechanisms of origin for BSMTSD/non-BSMTSD and lateral/non-lateral TTA types are probably responsible for the difference in prognosis. Favorable prognosis in patients with long seizures is discussed in relation to the duration of the illness. EEGs with BSMTSD and lateral TTA type may indicate a favorable prognosis in children with absence seizures.

Adolescent↗