Head And Neck Muscles Activation Patterns Among Oral Postgraduate During Different Dental Procedure Postures

Objective:To measure the EMG data of head and neck muscles in different posture of operation dental procedures by electromyography.Methods:A total of40 volunteers aged 24.9 years were selected.The Bio EMG?II was used to me-asure both the asymmetry index and the EMG of anterior temporalis,masseter mu-scle,sternocleidomastoid and anterior belly of digastric at the four different postu-res,Natural head and neck posture position?P₀?,lower self head with 15 degrees position?P₁?,lower self head with 45 degrees position?P₂?,and lower plus right inc-line self head with 45 degree position?P₃?.Results:There was no statistical differ-ence in the potential change of head and neck muscles between P₀ and P₁ positi-on?P>0.05?.Both the EMG activities in the head and neck muscles of P₂ and P₃group were different from that of control group P₀,the difference is statistically si-gnificant?P<0.05?.The SCM Asymmetry Index of control group P₀ was statistical different from the P₃ group?P<0.05?.Conclusion:The mandibular posture position,the EMG activities of head and neck muscles between different postures were diff-erent,indicating that the unhealthy postures of the dentists have notable effects o-n the normal physiological function of the head and neck muscles.