title: Electrosonographic characteristics of sounds from temporomandibular joint disc replacement.
abstract: The purpose of this study was to investigate the waveform and electrosonographic characteristics of sounds emanating from internal derangement of the temporomandibular joint (TMJ). TMJ sounds were recorded from 10 joints of normal people (NP), 10 joints from patients with anterior disc displacement with reduction (DDR) and 20 joints from patients with anterior disc displacement without reduction (DDNR). The sounds were analyzed through fast Fourier transfer methods to observe their waveforms and electrosonographic characteristics. The observations were then used in differentially diagnosing internal derangement. Wave pattern and electrosonography (ESG) differed among the NP, DDR and DDNR groups. There was very little difference in frequency between the sounds from DDR and DDNR, but the amplitude of the DDR sounds was higher than those of DDNR and NP. The sensitivity and specificity of ESG diagnosis for DDR were 77.2% and 93.3%, respectively, while for DDNR they were 81.6% and 64.7%, respectively.
authors.affiliation: Department of Oral & Maxillofacial Surgery, Key Lab for Oral Biomedical Engineering of Ministry of Education, School and Hospital of Stomatology, Wuhan University, Wuhan, Hubei Province 430079, PR China.
authors.forename: M
authors.initials: M
authors.lastname: Deng
authors.forename: X
authors.initials: X
authors.lastname: Long
authors.forename: H
authors.initials: H
authors.lastname: Dong
authors.forename: Y
authors.initials: Y
authors.lastname: Chen
authors.forename: X
authors.initials: X
authors.lastname: Li
mesh_terms: D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D004568:Electrodiagnosis / Q000379:methods*; D005260:Female; D005583:Fourier Analysis; D006801:Humans; D004204:Joint Dislocations / Q000175:diagnosis; D008297:Male; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013018:Sound Spectrography; D019224:Temporomandibular Joint Disc; D013705:Temporomandibular Joint Disorders / Q000175:diagnosis*