Measurement of the intensity of sound generated by impacts on teeth : emission of percussion sound from an experimental model

P(論文)Determination of the modality of transmission of the biting force exerted on teeth to the periodontal tissue is important in prosthesis design, to harmonize with the various functions of the jaw and oral region. The possibility of determining the modality of transmission of impacts on a tooth crown to the periodontal tissue via the tooth root by detecting emissions of percussion sounds was attempted. An experimental model, in which an artificial left upper central incisor and a left lower first molar set in dental plaster was oscillated, and the resulting percussion sounds were measured by the sound-intensity measurement method. The following results were obtained: 1. Application of the sound-intensity measurement method allowed a 3-dimensional visualization of the percussion sounds emitted by the experimental model in the frequency bands 400～10KHz, 5000, 6300, and 8OOOHz. 2. The choice of frequency band was considered important for the detection of percussion sound emissions from the experimental model by measurement of the sound intensity. 3. In the 8OOOHz band, percussion sound emissions were detected from the root region as well as from the tooth crown of the impact, enabling acoustic detection of the modality of transmission of the impact from the tooth crown to the root region. Different percussion sounds were observed from the root regions of the left upper central incisor and left lower first molar.departmental bulletin pape