Logistic Regression Analysis Of Influencing Factors Of Anterior Disc Displacement Of Temporomandibular Joint

Purpose:To screen out the risk factors for ADD by evaluating MRI images of a large number of patients with TMD quantitatively and qualitatively,and guide clinical diagnosis and treatment..Methods:A total of 504 patients with TMD,including 1008 TMJs,were included.The results of MRI of all TMJs were evaluated as follows:(1)The length of articular disc;(2)The shape of articular disc: According to the deformity and folding degree of articular disc,it can be divided into type I,type II,type III,type IV and type V;(3)The height of condyle: The mandibular plane(RP)method was used to measure;(4)The morphology of condyle: oval,flat,angular and beak;(5)The condylar position: anterior position,neutral position and posterior position;(6)The morphology of articular eminence: box,C-shaped,flat and irregular.According to whether the position of the articular disc moves forward in the open position and the closed position,it is divided into NADP group,ADDWR group and ADDWo R group.Single factor analysis was used to compare the differences of age,sex and various evaluation indexes among the three groups,and the statistically significant variables after single factor analysis were included in multivariate logistic regression analysis.According to the results,the risk factors of ADD were screened out.Results:1.Among 504 TMD patients,80.16%(404 cases)were women.The average age of patients is 23.83±10.76 years old,and there are more patients aged 10-19 and 20-29 years old(accounting for 40.87% and 39.48% respectively).2.The results of univariate analysis showed that there were significant differences in age,sex,articular disc length,articular disc shape,condyle height,condyle shape,condyle position and articular eminence shape among the three groups.3.Logistic regression analysis shows that:(1)Compared with NADP,ADDWR: 1)The risk of ADWR in men is significantly higher than that in women;2)There is no significant statistical relationship between age and ADDWR;3)The shorter the articular disc,the higher the risk of ADDWR;4)Compared with type Ⅰ articular disc,the risk of ADDWR is significantly higher for typeⅢ,Ⅳ and Ⅴ;5)There is no significant statistical relationship between condyle height and ADDWR;6)Compared with oval condyle,the risk of angle-shaped ADDWR is significantly higher;7)Compared with neutral condyle,the risk of ADDWR in posterior position is significantly higher;8)Compared with C-shaped articular eminence,the risk of ADDWR is significantly higher for box-shaped joint.(2)Compared with NADP,ADDWo R: 1)The risk of ADDWo R in men is significantly higher than that in women;2)There is no significant statistical relationship between age and ADDWo R;3)The shorter the articular disc,the higher the risk of ADDWo R;4)Compared with type I articular disc,the risk of type II,type III,type IV and type V ADDWo R is significantly increased;5)The lower the height of condyle,the higher the risk of ADDWo R;6)Compared with oval condyle,the risk of ADDWo R in flat,angular and beak shape is significantly higher;7)Compared with the neutral condyle,the risk of ADDWo R in the posterior position is significantly higher;8)Compared with C-shaped articular eminence,the risk of box-shaped and flat-shaped articular eminence is significantly higher.Conclusions:1.TMD is common in 10-29 years old.2.Compared with NADP,male,short disc length,type Ⅲ/Ⅳ/Ⅴ disc,angular condyle,posterior condyle and box-shaped articular tubercle are the common risk factors for ADDWR and ADDWo R.3.Compared with NADP,type Ⅱ articular disc,low condyle height,flat/beakshaped condyle and flat articular eminence are the risk factors for ADDWo R.4.Evaluating these risk factors is valuable for predicting the risk of ADD,and can provide a basis for early clinical intervention.