An agent for use in improving or promoting osseointegration or soft tissue sealing of a ceramic or metallic implant, wherein the agent comprises trisodium citrate, citric acid, monobasic sodium phosphate, dextrose and adenine. Preferably the agent is dissolved in water to form an aqueous solution and provides at least one coating on the implant, obtainable by immersing the implant in the agent. The surface of the ceramic or metallic implant is preferably hyperhydrophilic. Also claimed is the use of said agent for coating a ceramic or metallic implant, the implant itself having at least one coating of said agent, and a kit for use in a method of installing a ceramic or metallic implant and said agent. The invention preferably relates to dental implant technology for dental supports carrying tooth-like crowns.