牙尖斜度对套筒冠义齿基牙位移的影响  

Influence of cusp inclination of artificial posterior teeth on abutment displacement of the telescope crown denture

作　　者：杨涛 

机构地区：[1]江苏省无锡市华东疗养院口腔科,214065

出　　处：《实用口腔医学杂志》2006年第5期599-603,共5页Journal of Practical Stomatology

摘　　要：目的:探讨人工牙牙尖斜度对单侧游离端套筒冠义齿基牙位移的影响。方法:建立肯氏II类塑料模型,制作不同牙尖斜度的套筒冠义齿,在食片介在的咬合状态下垂直加载29.4、49、68.6N时,测量基牙位移值,通过计算求出各方向的位移、扭转量,最后进行统计分析。结果:解剖式人工牙与25°半解剖式人工牙相比,两基牙在颊舌向及垂直向位移差异有统计意义(P<0.05);解剖式人工牙与12°半解剖式人工牙相比,基牙在各方向的位移、倾斜、扭转差异均有统计意义(P<0.05);无尖人工牙与25°半解剖人工牙相比,除近远中向外,基牙的位移、倾斜、扭转差异均有统计意义(P<0.05);无尖人工牙与12°半解剖人工牙相比,基牙水平扭转程度差异无统计意义(P>0.05)。随负荷力增加,基牙位移量、倾斜角度、水平扭转角度也随之增加,各组之间差异有统计意义(P<0.05)。结论:套筒冠义齿修复下颌牙列单侧游离端缺损时,减小人工牙牙尖斜度,基牙在各轴向的位移、倾斜、扭转程度随之减小;基牙的位移量与负荷力大小有关。Objective：To study the influence of cusp inclination of artificial posterior teeth on abutment displacement of unilateral distal-extension telescope crown denture. Methods：Study models of mandibular unilateral distalextension and telescope crown dentures with the cusp inclination of 0°, 12°,25° and 33° were respectively prepared. When food chip was masticated on the occlusal surface and the dentures were loaded by 29.4 N, 49 N or 68.6 N, the abutment displacement was measured. Then the data were calculated and reciprocally compared with statistical analyses. Results：Between anatomic and 25° semi-anatomic artificial posterior teeth, there were significant differences in the buccolingual and vertical abutment movement（ P 〈 0.05 ）. There were significant differences in the abutment displacement on all three axes between anatomic and 12°semi-anatomic artificial posterior teeth （P 〈0.05）. Between cuspless and 25°semi-anatomic posterior teeth, there were significant differences in abutment displacement on all three axes except the misiodistal direction （P 〈 0.05 ）. Between cuspless and 12° semi-anatomic posterior teeth,there was no significant differences in the twist-like displacement（ P 〉0.05 ）. The parallel, inclination, twist-like and vertical movement of abutment increased with the increase of the load on the denture. The difference among different level of load was statistically significant （ P 〈 0.05 ）. Conclusions： Abutment displacement can be reduced through reducing cusp inclination of artificial posterior teeth. The displacement of abutment correlates to the load on the denture.

关 键 词：套筒冠 牙尖斜度 基牙 位移 

分 类 号：R783.4[医药卫生—口腔医学]