目的：测量对比不同牙位、不同设计时基牙聚合角的值。方法：测量226个不同牙位，不同设计基牙的近远中径与颊舌径，利用上下之差计算出聚合角。在测量的每个面上选取三点，即龈端点、中点、切端点。用游标卡尺测量两相对面上对应点间的距离，分别纪录各组数据，再计算上，下半端的值。结果：各牙位的聚合角的平均值为：第一前磨牙4.13°±0.77°, 第二前磨牙4.14°±0.76°, 第一磨牙4.46°±0.95°, 第二磨牙4.76°±0.84°。前磨牙与磨牙之间的聚合角有显著性差别，但第一前磨牙与第二前磨牙之间、第一磨牙与第二磨牙之间无显著差别。第一磨牙为基牙的单冠、三单位桥、长桥的聚合角的平均值分别为：3.78°±0.74°、4.69°±0.75°、5.08°±0.85°，单冠与三单位桥、长桥之间均有差别。而三单位桥、长桥间无差别。结论：不同牙位，不同设计对聚合角有影响。对于不同的牙位及设计，要视临床的具体情况调整聚合角大小，不能都在2°～5°之间。%Objective: To measure the convergence angles of teeth in different teeth positions and different denture designs.Methods:Mesio-distal widths and labio-lingual widths were measured on 226 teeth according to three points in a line on three surfaces (gingival, middle and incise) of each tooth.The distance between every point and the counterpart point in the adjacent surface was measured.Then convergence angles were calculated. Results:The means of the angles were 4.13°±0.77°,4.14°±0.76°, 4.46°±0.95°, 4.76°±0.84° on the first and second premolar, the first and second molar,respectively . There were significant differences between the premolars and molars(P<0.05).On the dentures with the designs of monocrown, triunit-bridge and long bridge the means of the angles were 3.78°±0.74°,4.69°±0.75° and 5.08°±0.85° respectively,the angle on the denture with the design of monocrown was smaller than that of bridge (P<0.05).Conclusion:The convergence angles are different according to different teeth positions and different denture designs, so they should be adjusted according to the clinical requirements.
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