Takeshita F, Suetsugu T, Higuchi Y, Oishi M
Prosthetic Dentistry II, Kyushu University, Faculty of Dentistry, Fukuoka, Japan.
Int J Oral Maxillofac Implants. 1996 Mar-Apr;11(2):245-50.
Nine hollow dental implants that were removed from patients were examined histologically to determine whether there was a common mechanism of failure with this implant design. When a hollow implant showed saucerized bone loss at the neck portion radiologically, the hollow portion was divided histologically into soft tissue and bone tissue. In advanced cases, stratified flattened epithelium that had invaded the hollow and the dead space at the top was observed. The condition of bone tissue located in the bottom of the basket can be adversely affected by an unfavorable crown-root ratio. The presence of an empty basket may cause fracture of the basket portion. The hollow portion can foster the growth of pathogenic bacteria. The hollow-type implant may not be suitable for immediate placement because surrounding soft tissues can invade the basket immediately.
对从患者体内取出的9颗空心牙种植体进行了组织学检查，以确定这种种植体设计是否存在共同的失败机制。当空心种植体在颈部出现放射学上的碟形骨吸收时，将空心部分在组织学上分为软组织和骨组织。在晚期病例中，观察到分层扁平上皮侵入空心部分和顶部的死腔。牙槽窝底部骨组织的状况可能会受到不利的冠根比的负面影响。空牙槽窝的存在可能导致牙槽窝部分骨折。空心部分可促进病原菌生长。空心型种植体可能不适合即刻种植，因为周围软组织可立即侵入牙槽窝。
