Bowley J F, Marx D B
Kuwait University Health Sciences Center, Jabriya, Kuwait.
J Prosthet Dent. 2001 Mar;85(3):252-60. doi: 10.1067/mpr.2001.114142.
Masticatory muscle hyperactivity is thought to produce muscle pain and tension headaches and can cause excessive wear or breakage of restorative dental materials used in the treatment of prosthodontic patients. The quantification and identification of this type of activity is an important consideration in the preoperative diagnosis and treatment planning phase of prosthodontic care.
This study investigated the quantification process in complete denture/overdenture patients with natural mandibular tooth abutments and explored the reliability of instrumentation used to assess this parafunctional activity.
The nocturnal EMG activity in asymptomatic complete denture/overdenture subjects was assessed with and without prostheses worn during sleep. Because of the large variance within and between subjects, the investigators evaluated the reliability of the 3 instruments used to test nocturnal EMG activity in the sample.
Electromyographic activity data of denture/overdenture subjects revealed no differences between prostheses worn versus not worn during sleep but demonstrated a very large variance factor. Further investigation of the instrumentation demonstrated a consistent in vitro as well as in vivo reliability in controlled laboratory studies.
The portable EMG instrumentation used in this study revealed a large, uncontrollable variance factor within and between subjects that greatly complicated the diagnosis of parafunctional activity in prosthodontic patients.
咀嚼肌活动过度被认为会导致肌肉疼痛和紧张性头痛，并可能导致用于修复牙科学患者治疗的修复性牙科材料过度磨损或破损。在修复牙科护理的术前诊断和治疗计划阶段，对这种活动类型的量化和识别是一个重要的考虑因素。
本研究调查了天然下颌牙基牙的全口义齿/覆盖义齿患者的量化过程，并探讨了用于评估这种副功能活动的仪器的可靠性。
在无症状的全口义齿/覆盖义齿受试者睡眠期间佩戴和不佩戴假体的情况下，评估其夜间肌电图活动。由于受试者内部和之间存在较大差异，研究人员评估了用于测试样本中夜间肌电图活动的3种仪器的可靠性。
义齿/覆盖义齿受试者的肌电图活动数据显示，睡眠期间佩戴和不佩戴假体之间没有差异，但显示出非常大的差异因素。对仪器的进一步研究表明，在受控实验室研究中，体外和体内均具有一致的可靠性。
本研究中使用的便携式肌电图仪器显示，受试者内部和之间存在一个很大的、无法控制的差异因素，这极大地复杂化了修复牙科患者副功能活动的诊断。
