The evaluation of anterior guidance verified by masticatory movements

咀嚼受到前路引导的影响。然而，很少有研究咀嚼与前路引导之间关系的报道。侧导参与了前路引导的重要功能。本研究旨在探讨侧导改变对咀嚼运动的影响。实验共4例受试者，其中3例男性无TMD症状，1例女性TMD患者。制备了两种金属导轨，一种是由上颌犬齿近中突引导下颌犬齿远中突的M型犬齿外侧导轨，另一种是由上颌犬齿远中突引导下颌犬齿近中突的D型金属导轨。进行牙龈咀嚼和空口咀嚼样动作。这些运动由MM-J1 （youfu Co.）和一台小型计算机（DEC Co. vax Station 4000）测量，并由图形终端（Evans & Sutherland Co. ps 390）分析。结果表明，两种侧导犬的咀嚼痕迹范围较无侧导犬窄，且窄化趋势多为M型而非D型。对于工作侧髁突点投影水平面的咀嚼运动，D型明显比M型更向后外侧扩散。侧导对空口类咀嚼运动的影响大于对牙龈咀嚼运动的影响。M型导引器稳定了TMD患者的咀嚼运动轨迹。

Mastication is receiving an influence of anterior guidance. However, there are few reports that examined about the relation between mastication and anterior guidance. Lateral guide participates a significant function of anterior guidance. The aim of this study is that examines about an influence of changing of lateral guide upon the masticatory movement. An experiment was carried out total 4 subjects without canine occlusal contact with intercuspal position, consisted 3 male volunteers who do not have any TMD symptom and one female TMD patient. Two kinds of metal guide were prepared, one was M type canine lateral guide which the maxillary canine mesial facet guided the mandibular canine distal facet and another was D type which the maxillary canine distal facet guided the mandibular canine mesial facet. Gum mastication and masticatory like movement with empty mouth were carried out. Those movements were measured by using MM-J1 (Syoufu Co.) and a minicomputer (DEC Co.VAX Station 4000), and analyzed by a graphic terminal (Evans & Sutherland Co.PS 390).As a result, the range of mastication trace with both canine lateral guides was narrow compared with no guide, and the trend of narrowing was more M type than D type. For masicatory movements of working side condylar point projected horizontal plane, the trace of D type was more spread to retrolateral side than that of M type obviously. Masticatory like movement with empty mouth was more influenced than gum mastication by lateral guides. The trace of masicatory movement in TMD patient was stabilized by M type guide.