重度磨耗患者髁位重建中正中关系的可重复性评价

目的　对6例口颌系统功能基本正常而需要建的中老年重度磨耗患者正中关系(CR)的可重复性进行评价。方法　铰链轴法确定髁突运动轴点,关系采用三维电子式髁突运动描记仪Pantronic记录并转移至 Denar D5A型全调节式咬合架上,用双手扶持法对6例需要建的重度磨耗患者CR在不同体位下髁位的可重复性进行评价。结果　患者仰卧位时,在前后方向,CR的位移量平均为0·14 mm;在上下方向,CR的平均变化量为 0·11 mm。患者直立位时,在前后方向,CR的位移变化量为0·35 mm;在上下方向,CR的位移量在0·20 mm。CR在上下方向的稳定性和重复性要高于前后方向。结论　在口颌系统功能正常的情况下,CR的稳定性和可重复性好, 在咬合治疗和功能重建中,是比较理想的参考治疗位。

Reproducibility of Centric Relation of the Patient with Severe Dental Attrition for Oral Rehabilitation

OBJECTIVE: Standards for determining mandibular position, especially the centric relation (CR), are in controversy because of anatomical, neurophysiological factors and research methods or instrument. The purpose of this study was to reevaluate the reproducibility of centric relation of the patients with severe dental attrition for oral rehabilitation. METHODS: Reproducibility of the centric relation of 6 patients with severe occlusal attrition was investigated by using D5A Denar fully adjustable articulator and the Pantronic recording system. RESULTS: 1. In supine position, anterior-posterior(AP) displacement of centric relation (CR) was 0.14 mm and superior-inferior(SI) displacements of CR were between 0.11 mm-0.12 mm. 2. In upright position, anterior-posterior displacement of CR was 0.35 mm and superior-inferior changes of CR were between 0.13 mm-0.20 mm. CONCLUSION: The CR is the most stable and reproducible position of mandibule in normal stomatological system and is useful as a reference position in occlusal treatment and functional rehabilitation.