Hannover Medical School, Department of Prosthetic Dentistry and Biomedical Sciene, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
Private Practice, Eichenau.
Eur J Prosthodont Restor Dent. 2021 May 28;29(2):112-118. doi: 10.1922/EJPRD_2145vonmaltzahn07.
If bacteria penetrate through the implant-abutment connection, they may initiate inflammatory reactions in the peri-implant tissue. It seems that the type of connection plays a key role in the development of peri-implantitis. The aim of the present in vitro study was to compare the microleakage of implant-supported fixed complete arch bridges at the levels of abutment and implant.
Ten identical polyurethane model bases containing six implants each were produced using an edentulous model of the upper jaw. These models were prepared with two types of implant-supported complete arch prostheses. Five specimens were fixed at implant level and five at abutment level. The inner parts implants were inoculated with Escherichia coli (E.coli). Each implant was surrounded with closed bacteria-proof vessels to observe bacterial migration from the inner parts of implants to the nutrient solution. Samples of nutrient solution were taken at different time points up to 2 to 10 days and colony forming units were determined.
The bacterial accumulation in the implant-supported bridges at the implant level was significantly lower than at the abutment-level (p=0.00953).
For implant-supported fixed complete arch prostheses, bacterial accumulation was lower at the implant level than at the abutment-level.
如果细菌穿透种植体-基台连接，它们可能会在种植体周围组织引发炎症反应。连接方式似乎在种植体周围炎的发展中起着关键作用。本体外研究的目的是比较种植体支持的固定全弓桥在基台和种植体水平的微渗漏。
使用上颌无牙模型制作了包含 6 个种植体的 10 个相同的聚氨酯模型基底。这些模型采用两种类型的种植体支持的全弓修复体制备。5 个样本固定在种植体水平，5 个固定在基台水平。将内部植入物接种大肠杆菌（E.coli）。每个植入物周围都有封闭的防菌容器，以观察细菌从植入物内部迁移到营养液中。在 2 到 10 天的不同时间点采集营养液样本，并确定菌落形成单位。
在种植体水平的种植体支持桥梁中的细菌积累明显低于基台水平（p=0.00953）。
对于种植体支持的固定全弓修复体，种植体水平的细菌积累低于基台水平。
