Implant-supported dentures are increasingly used in dental practice since last century. The purpose of this review is to assess the effect of the transmucosal surface of restorations and implants on peri-implant tissues. Factors that affect bone loss around implants can be divided into local, systemic and social. Local factors include implant geometry, occlusal loading, and biological aspects. Biological factors include peri-implantitis, poor bone quality, surgical implant placement procedure, early implant loading, and poor osseointegration. Among other factors that can lead to bone loss, systemic factors (patient age, general condition, genetic predisposition) as well as social factors (socioeconomic status of the patient, oral hygiene, drug use) play an important role. The article compares and discusses the properties of different materials. The advantages, disadvantages and biomechanical concept of different implant-abutment connections are presented. The location of the connections relative to the bone level and the effect of the micro-gap between the abutment and the implant are described. The article focuses on the following issues: exposure to the material from which the implants and abutment are made, with an emphasis on titanium alloys and zirconium dioxide; implant systems, which are classified according to their location in relation to the level of the bone; type of connection between implants and abutments: external (external hexagon), internal (internal hexagon and octagon) and their modifications, such as conical (Morse taper); the influence of the precision of abutments to the implants` connection; type of fixation; features of transmucosal surfaces; biological factors around the implant-abutment joint. Scientists and manufacturers offer advanced solutions that reduce the number of complications and ensure a longer service life of implants-supported restorations. With proper procedures and the right selection of systems and tools, you can reduce bone loss and preserve soft tissue. Finding a balance between function and aesthetics in implant rehabilitation is a crucial issue. The use of solutions aimed at achieving the expected result in each individual patient, which allow individual consideration of the above risk factors for marginal bone loss, will probably become a standard part of the examination at the preoperative stage of treatment.