Sindelar B J, Herring S W, Alonzo T A
School of Physical Therapy, Ohio University, Athens, OH 45701, USA.
J Oral Rehabil. 2003 Aug;30(8):823-31. doi: 10.1046/j.1365-2842.2003.01137.x.
While evidence exists to support the effectiveness of splints on conditions involving the masticatory musculature, few research projects have examined the results of long-term splint wear. The purpose of this study was to examine the function of the masticatory system over a 2-month time period of splint wear. Young adult female miniature pigs were divided into three groups: a control (C) group that wore no intraoral splint, a control splint (CS) group that wore a splint increasing bite height, and a protrusive splint (PS) group that wore a splint increasing bite height and moving the mandible anteriorly. Splints were worn constantly. Fine-wire needle EMG was performed prior to splint delivery and at 1 and 2 months post-splint delivery. Bilateral superficial masseters and zygomaticomandibularis (ZM, equivalent to deep masseter) muscles were monitored during normal feeding. Absolute EMG output, percentage output, and cycle timing were unaffected by chronic splint wear. However, chewing coordination was significantly changed in the splinted groups in both sessions post-splint delivery relative to baseline readings and to the C group (P < 0.005). Trends indicate that the coordination of the PS group was more greatly altered than that of the CS group.
虽然有证据支持夹板对涉及咀嚼肌组织病症的有效性，但很少有研究项目考察长期佩戴夹板的结果。本研究的目的是在佩戴夹板的2个月时间段内考察咀嚼系统的功能。将年轻成年雌性小型猪分为三组：不佩戴口腔内夹板的对照组（C组）、佩戴增加咬合高度夹板的对照夹板组（CS组），以及佩戴增加咬合高度并使下颌向前移动夹板的前伸夹板组（PS组）。夹板持续佩戴。在佩戴夹板前以及佩戴夹板后1个月和2个月进行细针电极肌电图检查。在正常进食期间监测双侧浅层咬肌和颧下颌肌（ZM，相当于深层咬肌）。绝对肌电图输出、输出百分比和周期时间不受慢性夹板佩戴的影响。然而，相对于基线读数和C组，在佩戴夹板后的两个时段，夹板组的咀嚼协调性均发生了显著变化（P < 0.005）。趋势表明，PS组的协调性改变比CS组更大。
