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牙重度磨损在老年病例较多见 ,这类患者多伴有后牙缺失 ,龈高度变短 ,垂直距离降低 ,致使颞颌关节髁状突后移、——关节——肌肉功能失调 ,关节疼痛酸困 ,咀嚼乏力 ,下颌运动偏斜 ,面容苍老等一系列症状 .此类游离端及咬合低的义齿设计的难度最大 .垫矫正法是常用方法 ,制作垫的厚薄的确定 ,常用法有面中1/ 3和面下 1/ 3的比例法 ,口内直接蜡模咬等 ,这些都单纯直观和患者自我感觉 ,难免有偏颇而影响疗效 .作者自1989年始采用髁状突 X线摄片定位法结合面中 1/ 3和面下 1/ 3比例法 ,制作的垫在恢复关系及垂直高度上符合生理变化 ,更趋合理性、正确性 ,因而疗效也好 .
Severe tooth wear in more elderly cases, such patients are often accompanied by loss of posterior teeth, gingival height shorter, lower vertical distance, resulting in temporomandibular condyle shift, - joint - muscle dysfunction, Joint pain and acid sleepy, chewing fatigue, mandibular movement skew, face old and a series of symptoms such as free ends and bite low denture design the most difficult.Cushion correction method is commonly used method to determine the thickness of the pad, Commonly used method in the face of 1/3 and 1/3 under the surface of the ratio method, direct oral wax bite, etc., these are purely intuitive and the patient’s own feelings, will inevitably bias and affect the efficacy of the author since 1989, the beginning of the condyle X-ray radiography positioning method combined with the surface of 1/3 and 1/3 under the surface of the ratio method, the production of the pad in the relationship between the recovery and vertical height in line with physiological changes, more reasonable and correct, and thus the effect is good.