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This retrospective study compared the long-term outcomes of dental implants according to type of connection and surface. Multiunit restorations were classified as follows an external connection with a turned surface, an external connection with an anodized surface, or an internal connection with a fluoride-modified surface. Patients who were followed up for longer than 7 years after implant loading were included in the study. Cumulative implant survival rates and the amounts of marginal bone loss were calculated by reviewing dental rec