Int J Stomatol ›› 2026, Vol. 53 ›› Issue (4): 537-544.doi: 10.7518/gjkq.2026026

• Original Article • Previous Articles    

Vibrational characteristics of the temporomandibular joints in patients with anterior disc displacement with reduction

Jingjing Li1(),Linlin Shao2,Qing Yu1()   

  1. 1.Dept. of Prosthodontics, Nanjing Stomatological Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing 210008, China
    2.Dept. of Stomatology, Children’s Hospital of Soochow University, Suzhou 215025, China
  • Received:2025-06-06 Revised:2025-07-18 Online:2026-07-01 Published:2026-06-25
  • Contact: Qing Yu E-mail:jingjing.li@smail.nju.edu.cn;kqmike@163.com
  • Supported by:
    Nanjing Special Program for Life and Health Science and Technology(202205051)

Abstract:

Objective This study aimed to compare the vibration parameters of temporomandibular joint (TMJ) sounds during mouth opening and closing between patients with anterior disc displacement with reduction (ADDWR) and healthy individuals by using a TMJ vibration analysis system. Methods Vibration signals were collected during maximum mouth opening and closing from 51 joints diagnosed with ADDWR and 51 healthy control joints. The following parameters were extracted and analyzed: peak amplitude, total vibrational energy, vibrational energy above 800 Hz, and vibrational energy below 800 Hz. They were assessed and compared using the Mann-Whitney U test. Results The parameters evaluated were significantly higher in the ADDWR group than in the control group (P<0.01). Vibrations in ADDWR joints predominantly occurred during the mouth-opening phase. Conclusion The vibrational characteristics of ADDWR joints differ significantly from those of healthy joints. The TMJ vibration analysis system provides a dynamic, noninvasive, and cost-effective tool with potential utility in the auxiliary assessment of temporomandibular disorders.

Key words: temporomandibular disorders, anterior disc displacement, joint vibration analysis, accelerometer, temporomandibular joint vibration analysis system

CLC Number: 

  • R782.6

TrendMD: 

Fig 1

Schematic diagram of the TMJ vibration analysis system"

Fig 2

Interface of the TMJ vibration analysis system"

Tab 1

Experimental equipment and software"

设备和软件名称型号出产公司
设备加速度传感器SENTHER 510-A-100-M上海领途实业有限公司,中国
数据采集卡VK700深圳微精艺电子有限公司,中国
联想台式电脑启天M650-N000联想集团,中国
软件制图与分析软件(OriginPro graphing & analysis)2021bOriginLab公司,美国
数学计算软件(MATLAB)R2021bMathWorks公司,美国
统计分析软件(SPSS statistics)26.0IBM公司,美国
颞下颌关节声学检测系统本研究自行搭建

Fig 3

Time-domain signals of the TMJ vibration in the experimental and control groups"

Fig 4

Frequency-spectrum diagrams of TMJ vibration at three stages during maximum mouth opening and closing"

Fig 5

Time-domain plots of TMJ vibration in the experimental and control groups"

Fig 6

Peak amplitude between the exprimental and control groups"

Tab 2

Comparison of peak amplitude between the ADDWR and control groups"

组别MQUQLP
对照组0.044 30.072 60.034 20.000
试验组0.150 80.453 90.126 7

Tab 3

Comparison of frequency-domain parameters between the experimental and control groups"

振动能量/JADDWR组对照组P
MQUQLMQUQL
Itotal2.830×10-48.129×10-49.309×10-58.153×10-51.916×10-44.243×10-50.000
I18.027×10-82.221×10-76.491×10-85.354×10-86.372×10-84.364×10-80.000
I22.829×10-48.127×10-49.302×10-58.147×10-51.916×10-44.236×10-50.000

Tab 4

Distribution of clinically audible clicking du-ring movement phases"

TMJ运动时期试验组(n=51)对照组(n=51)
开口期232
闭口期31
开闭口期均发生140
临床可听弹响总数400
仪器检测振动但临床无弹响数113
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