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Research on the Effect of Different Dentist Operation Postures to the Self-comfort and the EMG of Neck and Shoulder Muscles

Author: WangXiaoQiong
Tutor: ChenYongJin；Zhang
School: Fourth Military Medical University
Course: Clinical Stomatology
Keywords: Dentists postural position Sternocleidomastoid Trapezius EMG
CLC: R78
Type: Master's thesis
Year: 2010
Downloads: 22
Quote: 0
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Abstract

The newborn's spine is formed by the thoracic kyphosis and sacral kyphosis bent forward, two bending can accommodate as much as possible the chest, pelvic organs. 3 months after the birth of the baby began to rise look forward, and then formed a permanent forward projection of the cervical curvature, in order to maintain the balance of the head. 18 months after birth, early childhood learning to walk, lordosis lumbar curve of the body above the sacral upright. This spine forming a four bending unique to humans. Coordinated and surrounding muscle tissue structure and function normally in a healthy state. But because people now work pressure, a small amount of exercise, as well as the nature of the work requirements in one position for a long time, resulting in excessive neck to withstand the pressure, the overload of the neck muscles, and thus the cervical flexion structural distortions, oppression cervical nerve and vertebral artery, so the cause neck pain, headache, dizziness, tinnitus insomnia brain symptoms of neurasthenia. For example, a dentist, personnel engaged in the work of the computer, they long time in one position, such as too long bow, migraine, causing the symptoms of muscle soreness and dysfunction of the shoulder and neck. The study proved that the dentist poor posture and work for a long time in one position is a major factor leading to the shoulder and neck muscle pain. Through the the different postures dentist period of self-comfort, and shoulder and neck muscle function changes for dentists using the what position bit in order to maximize the reduction of the impact of their shoulder and neck muscles due to occupational factors, the study make a specific analysis, quantitative data, in order to get an objective analysis of the dentist postural position changes on its shoulder and neck muscles, experimental and theoretical basis for the the operation specification dentist body posture. First, we observed three different operating positions for dentists and non-dentists self Comfort and shoulder and neck EMG. 20 cases dentist with 10 years of work experience as the experimental group, 20 cases of non-dentists crowd computer (non-engaged staff) as a control group. The application visual analog scale (Visual Analogue Scales, VAS) evaluation of the dentist three postural position (Pd-bit (P1), sitting bow 45 ° (P2), the right of migraine 45 ° (P3)) different time periods (15 seconds, 30 seconds, 60 seconds) within the self-comfort, and the the RM6280 multi-channel the physiological signal analyzer recording and analysis of the subjects three postural position, within a period of 60 seconds bilateral sternocleidomastoid, and trapezius The electromyographic area, and then calculate the symmetry index. The results showed that, pairwise comparison of the three positions of the dentist and non-dentist group results: 15 seconds, 30 seconds period of self-comfort score performance lower than P1 P2 bit lower than P3, P1, within 60 seconds of self-comfort performance scores for P1 lt; P2 lt; P3, indicating that P1 bit self-comfort score lowest, most comfortable; the P3-bit self-Comfort highest score, most uncomfortable; With bit P1 to P3 bits posture change and time extension of self-comfort scores gradually prompt bad posture is the main cause of the subjects shoulder and neck discomfort. Dentists group compared among groups with non dentist: the two time periods of 30 seconds and 60 seconds, in the position P2, P3 bit, dentists group self comfort scores were higher than those of non-dentist groups, indicating that the operating dentist than non dentist more sensitive to changes in posture, bit P2 the P3 bit Inadaptability greater; P1 bit groups comfort scores did not significantly difference. Dentists and non-dentists within a period of 60 seconds the three postural position shoulder and neck EMG area calculated results show that, whether on the left or right side of the dentist group of sternocleidomastoid and trapezius EMG area are significantly higher than the non- dentist group, indicating whether the posture in which the the dentist group of shoulder and neck muscle tension were higher than the non-dentist group. The dentist group right side of the sternocleidomastoid electromyography area P3 than P1 bit, suggesting that the P3 bit, long skewed to the right dental group and three non-dentist group sternocleidomastoid group posture EMG area pairwise comparisons: The head posture dentist right sternocleidomastoid contraction, shorter, and a state of tension; while the the dentist group of left sternocleidomastoid and left and right side of the non-dentist group the sternocleidomastoid no significant difference. Posture EMG area dentist group and non-dentist group trapezius group pairwise comparisons: the dentists group and the non-dentist group left and right side of the trapezius is no significant difference. The three postural position electromyography symmetry index results, dentists and non-dentist group 60 seconds the three postural position electromyography area symmetry comparison: P3 bit the dentist group left and right side of the sternocleidomastoid muscle symmetry index higher than non-dentists (symmetry index values ??between 0 and 1). Dentist group symmetry index more then 1, that the dentist group of the bilateral sternocleidomastoid more asymmetric; symmetry index of the three positions within the group of dentists and non-dentists pairwise comparisons no significant difference. This experiment confirmed that the dentist group is most comfortable when the Pd-bit; migraine 45 ° bit uncomfortable in the right, and the high degree of muscle tension, sternocleidomastoid function more asymmetric. Experiment II selected 20 cases with 10 years of work experience in the dentist as the experimental group (G ₁) and 20 patients with 5 years of work experience in the dentist (G ₂) to compare different work experience Comfort dentists in three different operating positions and shoulder and neck EMG. Self-comfort, EMG area and symmetry index measurements and calculations with the experimental one. G ₁ (dentist of 10 years of work experience) and the G ₂ (5 years of work experience in the dentist) in the same posture, the same time period Comfort scores no significant difference; period of 60 seconds, two dentists set of internal self-comfort score three postural position pairwise comparisons display: P1 bit significantly lower than the P3 P1 bit most comfortable, P3 most uncomfortable; G ₁ G ₂ group sternocleidomastoid and trapezius EMG area of ??the same side was no significant difference; G ₁, G ₂ group sternocleidomastoid three positions EMG area pairwise comparisons: the right sternocleidomastoid P1 significantly lower than the P3-bit Description G _{< / sub> and G ₂ group the right sternocleidomastoid in P3 bit high muscle tension, sternocleidomastoid EMG changed obviously; while the left sternoclavicular mastoid muscle no significant differences. Three positions G ₁ G ₂ group trapezius EMG area pairwise comparison: the left and right side of the trapezius P1 was significantly lower than the P3-bit instructions G ₁ and G ₂ group P3 bit when trapezius muscle tension is high, the trapezius EMG changed obviously. The two groups in the period of 60 seconds the three postural position electromyography area symmetry comparison shows that: The G ₁ left and right side of the trapezius muscle symmetry index higher than G _{only P3 bit 2}, show that the G ₁ symmetry index closer to a more asymmetric. G ₁ and the symmetry of the three positions in the group G ₂ group index pairwise comparisons no significant difference. The second part of the experiment confirmed Whether engaged in duration of dental work, the P1 bit still self very comfortable position; posture influence also proved to changes in muscle tension, poor posture caused by the shoulder neck muscle tension increase, P1 bit muscle lower tension; symmetry group of dentists shoulder and neck muscles function more than 10 years dentist group. Experimental conclusions: 1 Pd bit self-comfort, high, low EMG tension, the bilateral muscle function coordination is operating with a smaller impact on the dentist shoulder and neck EMG postural worth advocating. 2, right migraine can affect 45 ° to the dentist in the clinical work of self-comfort, the most discomfort, shoulder and neck muscle tension and muscle symmetry function also have some impact, should avoid the operation posture.}

Research on the Effect of Different Dentist Operation Postures to the Self-comfort and the EMG of Neck and Shoulder Muscles

Abstract

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