International Journal of Implant Dentistry • December 2016
First report of a two-year retrospective study with a newly developed bone-level implant system Peri-implant health and peri-implant bone stability after immediate implant placement
DR-Medic Stom. Henriette Lerner HL DENTCLINIC, Dr. Jonas Lorenz University Hospital Frankfurt · Department of oral, maxillofacial and plastic surgery, Professor Robert A. Sader Goethe-Universität Frankfurt am Main · Center of Stomatology and Dr. Shahram Ghanaati Goethe University of Frankfurt/Main; Universitätsmedizin der Johannes Gutenberg-Universität Mainz · Department for Oral, Craniomaxillofacial and Facial Plastic Surgery; Institute of Pathology
Dental implants have become a reliable and predictable treatment modality to replace missing teeth and retain dentures in edentulous patients. They can restore the oral health, form, function, mastication, articulation and aesthetics of the stomatognathic system with multi-year success rates of more than 90 per cent for implants in fully edentulous [1,2] or partially edentulous patients [3-6]. Variations in implant success have been found dependent upon surgical technique, loading protocol, implant localisation and bone quality –for example, lower success rates have been reported for maxillary implants than for mandibular implants [7,8]
In the past few decades, research on dental implants has led to a broad modification of the surgical and prosthetic protocols.
For the surface of dental implants there is a clear consensus regarding the superiority of roughened/micro-textured surfaces.
Other ways to increase the implant surface include the thread design, implant length and implant diameter. The implant design should incorporate features that best transform tensile and shear forces during mastication and minimize undesirable force components.
Also essential for the long-term stability of peri-implant bone tissue and an aesthetically and functionally sufficient dental implant is the stability of the implant/abutment connection, to prevent implant fractures and screw loosening and to keep the peri-implant bone level stable.
A space or micro-gap between the implant and abutment is unavoidable with a two-piece design; however, a smaller micro-gap can also sometimes be found in designs with platform switching and Morse-tapered conical connectors, used to transfer the micro-gap facing the implant axis and reduce micro-movement. This can reduce the propulsion of sulcus fluid and, consequently, crestal bone loss, even with implants inserted below the alveolar crest (subcrestally).
The aim of the present retrospective study was to describe the clinical and radiological results of a new implant system with a grit-blasted and acid-etched surface topography and a Morse-locking conical implant/abutment connection. Implants were inserted in fresh and intact extraction sockets of maxillary and mandibular non-salvageable teeth and were followed up clinically and radiologically after a mean loading time of two years. Special emphasis was placed on the maintenance of peri-implant health and the stability of peri-implant bone level.
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