Sekine H, Kishi M, Hotta H, Uetake M, Nakayama I, Mori T
Department of Removable Prosthodontics, Tokyo Dental College.
Shikwa Gakuho. 1990 Mar;90(3):411-9.
Changes caused by attrition in interocclusal contact were investigated in 11 subjects with natural dentition showing no or only slight attrition and 6 subjects with natural dentition showing moderate attrition. Interocclusal spaces in the molar region in the maximally intercuspidated position of each subject were recorded in White Silicone impression material. Light-transmittance measurements of interocclusal records were made to determine differences in interocclusal spaces. Results 1. Mean values of the most closely occluding area in the upper molar region Tooth kind I B II B I M II M Slight-attrition group 0.6 0.9 3.2 2.5 (mm2) Moderate-attrition group 7.2 11.0 30.4 26.8 (mm2) 2. Mean values of ratios between most closely occluding areas and occlusal-surface projecting areas in the upper molar region Tooth kind I B II B I M II M Slight-attrition group 1.1 1.7 3.1 2.7 (%) Moderate-attrition group 13.1 21.0 28.4 27.5 (%) Conclusions 1. Differences in interocclusal spaces between the slight- and moderate-attrition groups were apparent only in the most closely occluding areas. 2. When load on supporting tissues is proportionate to the size of the closely occluding area, the supporting load probably increases as attrition progresses, although the ratio of increasing load changes little among different kinds of teeth.
在11名天然牙列无磨耗或仅有轻微磨耗的受试者以及6名天然牙列有中度磨耗的受试者中，研究了磨耗引起的牙合间接触变化。用白色硅橡胶印模材料记录每位受试者在最大牙尖交错位时磨牙区的牙合间隙。对牙合记录进行透光率测量以确定牙合间隙的差异。结果：1. 上颌磨牙区最紧密咬合区域的平均值牙型 I B II B I M II M 轻微磨耗组 0.6 0.9 3.2 2.5 （mm²） 中度磨耗组 7.2 11.0 30.4 26.8 （mm²） 2. 上颌磨牙区最紧密咬合区域与牙合面投影区域比值的平均值牙型 I B II B I M II M 轻微磨耗组 1.1 1.7 3.1 2.7 （%） 中度磨耗组 13.1 21.0 28.4 27.5 （%） 结论：1. 轻微磨耗组和中度磨耗组之间的牙合间隙差异仅在最紧密咬合区域明显。2. 当支持组织上的负荷与紧密咬合区域的大小成比例时，尽管不同类型牙齿之间负荷增加的比例变化不大，但随着磨耗进展，支持负荷可能会增加。
