下颌球帽覆盖义齿与全口义齿戴用2~3年咬合特征研究

目的研究下颌球帽附着体固位覆盖义齿（COD）及全口义齿（CD）修复后2~3年咬合接触特征及差异。 方法采用T-ScanⅡ咬合分析仪对戴用2~3年CD及COD修复患者（各12例）进行体内咬合分布特征及 力升高时间的测定。记录患者义齿左右侧咬合面积不对称指数、咬合力中心（X,Y）值、咬合力前后向分布比率及 力升高时间。 结果（1）CD组、COD组左右侧咬合面积不对称指数、咬合力中心X值,差异无统计学意义（P > 0.05）;（2）COD组咬合中心前移,差异有统计学意义（P < 0.05）;（3） 力升高时间CD组0.28 s,COD组延长为0.59 s,差异有统计学意义（P < 0.05）。 结论正中咬合时,CD戴用2~3年咬合分布、 力升高时间近似正常 ,COD咬合中心向基牙区偏移, 力升高时间延长。

Occlusal characteristics of mandibular stud attachments retained overdenture and complete denture

ObjectiveTo investigate the occlusal characteristics of complete overdenture (COD) retained by stud attachments in mandibular and complete denture (CD) . MethodsTwenty-four subjects were rehabilitated with CD and COD and wore the dentures 2 to 3 years. Each study group was composed of 12 subjects. An occlusal analysis, using the T-Scan Ⅱ System, was performed to assess the following occlusal parameters: the distribution of occlusal contacts and the occlusion time. Results(1) For AOA and COF X there are no statistically significant difference between CD and COD (P > 0.05) . (2) The COF Y of COD move forward. There are significant differences between the two groups. (3) OT in CD group is 0.28 s, OT of COD group is 0.59 s. There are significant differences between the two groups (P < 0.05) . ConclusionCD and COD achieve bilaterally balanced in ICO. In COD group, center of occlusal force moves forward, while the occlusion time increased significantly.