Test group (
Patients in the test group received tissue-level implants with a 2.8 mm convergent transmucosal neck and an ultrathin threaded microsurface (UTM). The first portion consisted of a 0.8 mm height straight neck followed by a hyperbolic convergent portion of 2 mm height. The prosthetic connection was an internal hex of 3.4 mm (Prama, Sweden & Martina). In the restoration phase, titanium abutments without a finish line and a continuous surface with the convergent transmucosal neck were used following the B.O.P.T. philosophy.