Disconnection of the temporary abutment disrupts the initial soft tissue attachment and may compromise the peri-implant mucosal barrier. Thus, a two-piece abutment consisting of tissue-level base placed at the time of surgery and interchangeable prosthetic components, was developed. This open prospective multi-center investigation evaluated the clinical performance of the On1 concept after 1 year of function. Preliminary data for patients who completed the 1-year follow-up by August 2018 are reported.
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