The Analysis Of Related Factors With Mandibular Movement In Abnormal Temporomandibular Joint Vibration

Objective: Observing the temporomandibular joint vibration,clinical symptoms,occlusal,and masticatory muscle electromyography,and analysis of the temporomandibular joint vibration and the relationship between the mandibular movement related factors,in order to further explore the relationship between tooth,chewing muscles and temporomandibular joint to provide experimental basis.Methods:(1)Screening subjects: using systematic sampling method from Wangnan Medical College students of Stomatology and 120 grade 2013~2016,simple examination to exclude obvious malocclusion after more than 72 people(male 34,female 38,mean age 19.47 + 1.83 years).(2)The Bio JVA was used to detect the joint vibration of the subjects,and the results were recorded as JVA(+)and JVA(-)(3)TMD related questionnaire on the subjects,and by the same name check on subjects of temporomandibular joint(temporomandibular joint TMJ)pretragal palpation results for clinical(+)and clinical(-).(4)According to the clinical symptoms and joint vibration subjects were divided into the following four groups: A.(+)clinical JVA(+),B.(-)clinical JVA(+),C.(-)clinical JVA(-),D.(+)JVA(-clinical).Among them,A group can be diagnosed as TMD patients,B group only joint abnormalities without showing symptoms group,group C as control group of normal people,but no clinical symptoms of joint lesions in D group.(5)Using T-Scan III occlusal analysis system and Bio EMG III EMG analysis system synchronization check each subjects intercuspal position(intercuspal position,ICP),mandibular movement,occlusal contact characteristics and myoelectricity lateral movement,and statistical analysis.All of the subjects were aware of the experiment content,signed informed consent.Results:(1)JVA joint vibration analyzer test results of the subjects indicate the presence of abnormal joint vibration 35,lateral vibration parameters have no difference,irrespective of gender(P>0.05).The location of joint vibration in the mandibular movement in the process of opening and closing stage generally concentrated in the early period,the joint vibration distribution of joint abnormal vibration compared with the normal is more dispersed.(2)Combined with the chief complaints of the patients and one underwent temporomandibular joint examination on the subjects,the TMD clinical symptoms were 23 people(male 11,female 12),the positive rate of TMD 31.9%.among them,arthrosnap had the highest frequency down followed by mouth oblique,masticatory muscle pain and trismus.(3)Comparison of clinical symptoms and JVA joint record,visible abnormal joint vibration of 35 people in 21 people appeared obvious clinical symptoms of TMD,14 people showed no obvious abnormal changes of clinical symptoms,determine group: A group 21,B group 14,C group of 35 people.D group of 2 people.(4)ICP maximal clenching MIP frame occlusal contact results showed that each group of subjects COF position difference(P>0.05),the abnormal vibration of joint early contact was higher than the control group,AOF,OT,DT have significant difference(P<0.05);myoelectricity display LTA,RTA,LMM,RMM,LDA,average surface EMG the amplitude of RDA has significant difference(P<0.05),left and right side of TA,MM,DA symmetry is different(P<0.05),the ipsilateral TA and MM synergy had no statistical difference(P>0.05).(5)Mandibular movement when the abnormal vibration of joint protrusive occlusal interference was higher than the control group,four groups of subjects before occlusion separation time,LTA,RTA,LMM,RMM,LDA,the average surface EMG amplitudes of RDA were statistically significant(P<0.05).(6)The left mandibular movement when abnormal vibration joint lateral occlusal interference was higher than the control group,four groups of subjects left disclusion time, LTA,RTA,LMM,RMM,LDA,the average surface EMG amplitudes of RDA were statistically significant(P<0.05).(7)Right mandibular movement abnormal vibration joint lateral occlusal interference was higher than the control group,four groups of subjects right disclusion time,LTA,RTA,LMM,RMM,LDA,the average surface EMG amplitudes of RDA were statistically significant(P<0.05).Conclusion:(1)Joint of the abnormal vibration occlusal stability,high rate of tooth interference,the earlier they touch;Electromyography showed ICP bite when chewing muscles function decline,edges are more likely to happen when motion abnormality masticatory muscle contraction.(2)The occlusal disorders may cause chewing muscles and temporomandibular joint disorder,even for no obvious clinical symptoms of "normal" people,a higher value,alert to the occurrence of TMD.(3)The occlusal disorders is the cause of abnormal changes of joints and the relationship between muscle dysfunction,need occlusal interference experiment further validation.