van der Bilt Andries, van Kampen Frits M C, Cune Marco S
Department of Oral-Maxillofacial Surgery, Prosthodontics and Special Dental Care, University Medical Center Utrecht, the Netherlands.
Eur J Oral Sci. 2006 Jun;114(3):191-6. doi: 10.1111/j.1600-0722.2006.00356.x.
Oral Rehabilitation by means of implant-retained mandibular overdentures is known to improve the oral function. The improvement may depend on the degree of retention and stability of the denture and thus on the type of attachment. In this within-patient cross-over clinical trial, we examined the hypothesis that more retention and stability of the overdenture improves the masticatory function. Eighteen patients received two permucosal implants, a new overdenture, and, successively, three different suprastructure modalities: a magnet, a ball, and a bar-clip attachment. We quantified aspects of the oral function by measuring the electromyographic activity of the jaw muscles and the jaw movement during chewing. The muscle activity was significantly lower for the unsupported new mandibular denture compared with values for the supported new denture. No significant differences in muscle activity were observed among the three attachment types. Furthermore, we did not observe significant differences in jaw muscle activity between the old unsupported denture and the new supported denture, despite significant differences in masticatory performance. Measuring muscle activity during chewing will thus not provide adequate information about masticatory function. Thus, subjects chewed more efficiently after implant treatment. No changes in cycle duration or in jaw movement parameters were observed among the various measurement moments.
通过种植体支持的下颌覆盖义齿进行口腔修复已知可改善口腔功能。这种改善可能取决于义齿的固位和稳定程度，进而取决于附着类型。在这项患者自身交叉临床试验中，我们检验了以下假设：覆盖义齿更强的固位和稳定性可改善咀嚼功能。18名患者接受了两颗穿黏膜种植体、一副新的覆盖义齿，随后依次接受三种不同的上部结构形式：磁体、球帽和杆卡式附着体。我们通过测量咀嚼过程中颌面部肌肉的肌电活动和颌骨运动来量化口腔功能的各个方面。与有支持的新下颌义齿相比，无支持的新下颌义齿的肌肉活动明显更低。三种附着类型之间未观察到肌肉活动的显著差异。此外，尽管咀嚼性能存在显著差异，但我们未观察到旧的无支持义齿和新的有支持义齿之间颌面部肌肉活动的显著差异。因此，在咀嚼过程中测量肌肉活动并不能提供有关咀嚼功能的充分信息。因此，患者在种植治疗后咀嚼效率更高。在不同测量时刻未观察到周期时长或颌骨运动参数的变化。
