牙列重度磨耗患者（牙合）接触特征的研究

目的 分析牙列重度磨耗患者的（牙合）接触特征,从（牙合）学角度探讨牙列重度磨耗对口颌系统影响.方法 应用T-ScanⅡ型咬合分析系统对20例牙列重度磨耗患者和20例正常（牙合）者进行牙尖交错位、前伸及侧方运动的咬合记录.结果 磨耗组的（牙合）力中心的横向偏移量（10.5±1.5）mm、偏移距离（12.0±1.3）mm均大于对照组[（4.5 ±0.8）mm,（6.5 ±0.8）mm],闭合时间[（0.45±0.07）s]较对照组[（0.78±0.06）s]缩短,左右侧方（牙合）分离时间[（1.50±0.08）s,（1.50±0.10）s]较对照组[（0.93±0.07）s,（0.90±0.11）s]延长,侧方（牙合）干扰的出现率（70%）高于对照组（10%）（P＜0.01）,（牙合）力中心的纵向偏移量[（4.9±1.0）mm]、前伸（牙合）分离时间[（1.02±0.09）s]、早接触和前伸（牙合）干扰出现率（20%,30%）与对照组[（4.7±0.6）mm,（0.96±0.06）s,10%,10%]的差异无统计学意义（P＞0.05）.结论 牙列重度磨耗患者在（牙合）力中心的横向偏移量、偏移距离、闭合时间、侧方（牙合）分离时间和侧方（牙合）干扰出现率等（牙合）接触特征上存在异常.

Characters of occlusal contact in patients with severe tooth wear

Objective To analyze the characters of occlusal contact in patients with severe tooth wear. Methods The characters of occlusal contact in 20 cases with severe tooth wear and 20 persons with normal occlusion were measured with T-Scan Ⅱ occlusal analysis system. Results The offset degree in quantitative analysis showed that the offset in transversal and offset distance of center of force in the group with severe tooth wear[ ( 10. 5 ± 1.5 )mm, ( 12. 0 ± 1.3 ) mm ] were larger than control group [ (4. 5 ± 0. 8 )mm,(6. 5 ±0. 8)mm]. Occlusion time in severe tooth wear group[ (0.45 ±0.07)s]was shorter than control group(o)(0.78 ±0.06)s]. Lateral disclusion time in severe tooth wear group[ ( 1. 50 ±0. 08)s, ( 1.50 ±0.10) s ] was longer than control group [ ( 0. 93 ± 0. 07 ) s, ( 0.90 ± 0.11 ) s ]. Incidence rate of lateral occlusal interference in severe tooth wear group(70%) was higher than control group( 10%) (P ＜0.05). Offset in vertical of center of force [ ( 4.9 ± 1.0 ) mm ], protrusive disclusion time [( 1.02 ± 0. 09 ) s ], incidence rate of premature contact and protrusive occlusal contact interference( 20% ,30% ) showed no significantly statistical difference between two groups [ (4. 7 ± 0. 6 ) mm, (0. 96 ± 0. 06 ) s, 10% , 10% ] ( P ＞0. 05). Conclusion There were some differences in the characters of occlusal contact in patients with severe tooth wear.