摘要目的 探讨正常(牙合)不同(牙合)位(牙合)力分布规律,以期为临床提供参考.方法 选择正常(牙合)志愿者53名,男性29名,女性24名,年龄20 ～31岁[平均(25.9±2.1)岁],使用T-ScanⅢ咬合分析系统,测量正常(牙合)牙尖交错(牙合)、前伸(牙合)及侧方(牙合)各牙的(牙合)力百分比及咬合时间,分析侧方(牙合)的(牙合)接触类型.结果 正常(牙合)牙尖交错(牙合)时(牙合)力百分比最大的牙位依次为7｜、| 7、6|和|6,分别为(18.7±7.5)％、(15.7±7.1)％、(13.6±5.4)％和(13.3±4.3)％,7654 | 4567为(牙合)力集中区,(牙合)力百分比为(61.3±12.4)％；左侧(牙合)力百分比[(46.4±7.0)％]显著小于右侧[(53.6±7.0)％](P＜0.05).前伸(牙合)时21|12为(牙合)力集中区,(牙合)力百分比为(85.1±25.5)％,左前区(|123)与右前区(321|)的(牙合)力百分比分别为(49.2±26.4)％和(48.1±26.6)％,差异无统计学意义(t=-0.15,P＞0.05).左侧方(牙合)时尖牙保护(牙合)占28％(13/46),组牙功能(牙合)占33％ (15/46),多重保护(牙合)占39％ (18/46)；右侧方(牙合)时尖牙保护(牙合)占30％(14/46),组牙功能(牙合)占44％ (20/46),多重保护(牙合)占26％ (12/46)；侧方(牙合)时(牙合)力升高时间和咬合分离时间分别为(0.34±0.11)和(1.00±0.39)s.结论 20 ～ 30岁正常(牙合)牙尖交错(牙合)时第一前磨牙至第二磨牙是(牙合)力集中区,第二磨牙受力最大；前伸(牙合)时(牙合)力集中于21|12,侧方(牙合)(牙合)接触类型具有多样性.

abstractsObjective To investigate the normal occlusal force distribution and the characteristics of the occlusion time at different occlusion position using T-Scan Ⅲ occlusal analysis system.Methods Fifty-three volunteers with normal occlusion,including 29 males and 24 females,were included in this study.The average age was (25.9 ± 2.1) years old.T-Scan Ⅲ occlusal analysis system was used to measure the occlusal force distribution and the time character of normal occlusion at intercuspal position,protrusive position,and lateral excursive position.Results At intercuspal position the left and right side molar teeth took the most part of force percentage,followed by (13.3 ± 4.3) ％,(13.6 ± 5.4) ％,(15.7 ± 7.1) ％,(18.7 ± 7.5) ％ (|6,6|,|7,7|) ; and 7654|4567 took (61.3 ± 12.4) ％ force percentage; and the left and right sides took the respective percentages of (46.4 ± 7.0) ％,(53.6 ± 7.0) ％,the left side was significantly less than the right side (P ＜ 0.05).At the protrusion position the region (21|12) commitment to take the percentage of (85.1 ±25.5)％.At left and right lateral position,28％ (13/46) and 30％ (14/46) were cuspid-protected occlusion,and 33 ％ (15/46) and 44％ (20/46) were group fuctional occlusion,and 39％ (18/46) and 26％ (12/46) were multiple-protected occlusion.The average occlusion time was (0.34±0.11) s,and disclusion time was (1.00 ±0.39) s.Conclusions At intercuspal position the region from first premolar to second molar teeth were the occlusal force centers,and the second molar is the most; the force concentrated in the area (21 |12) at the protrusion position.The lateral occlusal pattern is multiformity.