Objectives: -to compare the clinical outcomes of standard, cylindrical, screw- shaped to novel tapered, transmucosal implants immediately placed into extraction sockets. Material and methods: In this randomized controlled clinical trial, outcomes were evaluated over a 3-year observation period. This report deals with the need for bone augmentation, healing events, implant stability and patient- centered outcomes up to 3 months only. Nine centres contributed a total of 208 immediate implant placements. All surgical and post-surgical procedures and the evaluation parameters were discussed with representatives of all centres during a calibration meeting. Following careful luxation of the designated tooth,allocation of the devices was randomly performed by a central study registrar. If the extraction socket was ≥1mm larger than the implant, guided bone regeneration was performed simultaneously (Bio Oss® and BioGide®). The flaps were then sutured. At surgery, the need for augmentation and the degree of wound closure was verified. Implant stability was assessed clinically and by means of resonance frequency analysis (RFA) at surgery and after 3 months. Wound healing was evaluated after 1, 2, 6 and 12 weeks postoperatively. Results: The demographic data did not show any differences between the patients receiving either standard cylindrical or tapered implants. All implants yielded uneventful healing with 15 % wound dehiscences after 1 week. After 2 weeks 93%, after 6 weeks 96% and after 12 weeks 100% of the flaps were closed. 90% of both implant designs required bone augmentation. Immediately after implantation RFA values were 55.8 and 56.7 and at 3 months 59.4 and 61.1 for cylindrical and tapered implants, respectively. Patient- centered outcomes did not differ between the two implant designs. Conclusions: This RCT has demonstrated that tapered or standard cylindrical implants yielded clinically equivalent short- term outcomes after immediate implant placement into the extraction socket. Supported by ITI Foundation, Basel, Switzerland