Surface Electromyographic Analysis Of Masticatory Muscles In Edentulous PD Patients After Two Complete Dentures Rehabilitation With Different OVD

ObjectiveTo analyze the surface electromyographic difference of masticatory muscles in edentulous Parkinson’s disease (PD) patients after two complete dentures rehabilitation with different occlusal vertical dimension (OVD).MethodTen edentulous PD patients with mandible tremor were selected, and two dentures were prepared for each patient and used alternately every other day. The OVD of Denture A was determined conventionally, and that of Denture B was2mm lower. Surface electromyographic (EMG) signals were recorded from both sides of the temporalis anterior (TA) and masseter (MM) muscles at1month and3months after the delivery of the two dentures. The patients’satisfaction about the two dentures was also judged and collecyted by questionnaire. Paired t-test and Wilcoxon test were used for statistical analysis.Results1. After3months, there was significantly higher satisfaction in Denture B than in Denture A (P<0.05) in the aspects of mastication function, comfortability and stability, while appearances and phonetics difference of the two dentures varied little(P>0.05).2. The changes of iEMG in TA and MM 1. Comparison between the two sets of dentures:After1month, there was no significant differences between the two dentures (P>0.05). However, after3months, Denture A showed higher level than Denture B (P<0.05).2. Temporal changes of the dentures themselves:No significant difference was shown between that of1month and3months in both MM and TA of Denture A (P>0.05), while in Denture B, MM and TA both showed a decreasing tendency temporally (P<0.05).3. Change in Mastoid Cycle:1. Comparison between the two sets of dentures:After1month, there was no significant differences between the two dentures (P>0.05). However, after3months, Denture A showed higher level than Denture B (P<0.05).2. Temporal changes of the dentures themselves:No significant difference was shown between that of1month and3months in both MM and TA of Denture A (P>0.05), while in Denture B, MM and TA both showed a decreasing tendency temporally (P<0.05).4. Ratio between Activation Period and Relaxation Period:1. Comparison between the two sets of dentures:After1month, there was no significant differences between the two dentures (P>0.05). However, after3months, Denture A showed higher level than Denture B (P<0.05).2. Temporal changes of the dentures themselves::No significant difference was shown between that of1month and3months in both MM and TA of Denture A (P>0.05), while in Denture B, MM and TA both showed a decreasing tendency temporally (P<0.05). especially with significant difference (P<0.01) in TA.Conclusions1. During3months, there was significantly higher satisfaction in Denture B than that in Denture A (P<0.05) in the aspects of mastication function, comfortability and stability. EMG results are consistent with patient satisfactory levels.2. The complete denture made for edentulous PD patients should be decreased OVD properly. 3. surface electromyography (sEMG) is usable towards evaluation of the effectiveness for dentures made for edentulous Parkinson’s disease (PD) patients as well as their adaptability.