Über den Autor
Anders Henningsen, Eric Freiwald, Maryam Setareh Sanj, Carolin Stolzer, Daniel Grubeanu, Henning Hanken, Ralf Smeets
Subcrestal implant placement of platform-switched implants preserves peri-implant bone: an investigation of immediate versus delayed placed implants
The preservation of peri-implant bone is one requirement for long-term success of dental implants. The purpose of this study was to evaluate the impact of subcrestal placement on the crestal bone level in immediate versus delayed placed implants after loading.
In this retrospective study, data of 159 patients who received 330 implants was analysed. Implants were placed subcrestally, crestally or epicrestally into fresh sockets or healed sites. Vertical bone level height was assessed radiographically and implants were followed up annually. The influence of patient and implant related risk factors for peri-implant bone loss was evaluated using a linear mixed model.
Depth of implant placement was significantly correlated with peri-implant bone loss (P = 0.001, 95 % CI). Crestal bone loss was determined when implants were placed between 1 mm and 1.99 mm subcrestally. Smoking significantly enhanced the risk of peri-implant bone loss (P = 0.04, 95 % CI). Immediate implant placement was not positively correlated with peri-implant bone loss (P = 0.51, 95 % CI).
Within the limits of this study, implant placement 1.08 mm subcrestally may be recommended in order to avoid supracrestal expositions of platform-switched titanium implants over time.