【摘 要】
：
目的观察人工种植牙修复牙列缺损的临床效,探讨牙种植体轴向和侧向即刻负载时的生物力学性能。方法 42例牙列缺损患者,共植入ITI Straumann牙种植体67枚,6个月后行种植义齿修
论文部分内容阅读
目的观察人工种植牙修复牙列缺损的临床效,探讨牙种植体轴向和侧向即刻负载时的生物力学性能。方法 42例牙列缺损患者,共植入ITI Straumann牙种植体67枚,6个月后行种植义齿修复。采用三维有限元法分析种植牙即刻负载时不同负载下种植体骨界面的应力及位移变化。结果修复后12个月,种植成功率为94.0%(63/67),其余各项指标良好。种植体轴向及侧向负载时,应力均集中在颈部,中部和根尖区应力逐渐较小;10°、20°及30°侧向负载时,颈1/3处落差较大,且随着侧向负载倾斜度增加,颈部应力增大。侧向负载时种植体的即刻负载位移均明显大于轴向负载位移(P<0.05),且种植体的即刻负载位移随负载角度的增大而增加。结论种植牙是一种优良牙列缺损修复方法,可获得满意效果,种植牙即刻负载技术是可行,应注意种植牙和基桩的吻合角度,尽量避免受到侧向力,以保证种植牙的成功率。
其他文献
本文估算了阜山金矿区成岩成矿期构造差应力值,获得近2km2内主压应力和差异应力的空间分布规律,结果表明矿体部位往往对应于应力应变强烈变化区段,而并非极高值或极低值处.通
Troponin C (TnC) is one of the subunits of troponin. Troponin, which is activated by Ca2+ binding, is a thin filament-associated regulator of vertebrate striate
细菌性痢疾是由痢疾杆菌引起的一种常见肠道传染病.临床实践证明痢疾杆菌耐药菌株逐年增加与广泛存在,可同时对多种药物耐药.我院肠道门诊于2000年5～10月,2001年5～10月收治的10
The potato (Solanum tuberosum L.) is the most important dicotyledonous source of human food. It ranks fifth major food crop of the world, exceed only by the gra
Oat (Avena sativa L.) and wheat (Triticum aestivum L.) vary in the structure of their inflores-cences and also in how pollination proceeds within the infloresce
急危症患者一般由急诊室接诊,但由于多种原因,一些患者到普通门诊就诊,因得不到及时的观察和病情预见,患者经常在短时间内发生病情变化而贻误抢救时机.现将我院2002～2003年间7
Rice grows well under certain condition and environment including soil, water and nutrients. Some researches have shown that traditional method with continues f
The present studies describe Chromosomal aberration effects of electrofishing, which were evaluated on Poecilia latipinna, located in Shat Al-Arab river in Al-g
Diphtheria is a fulminant bacterial disease caused by toxigenic strains of Corynebacterium diphtheriae whose local and systemic manifestations are due to the ac
答：（1）抗结核和抗麻风病药：抗结核药乙胺丁醇和异烟肼可引起神经炎,尤以乙胺丁醇为多见。常规用法用量下,有0.8%的患者服用乙胺丁醇后可引起球后视神经炎,发生率与剂量大小、使用