The study protocol was reviewed and approved by an Ethics Committee (CE) in Brazil. The sample will be prospectively selected and will consist of 18 patients, presenting 18 years of age or more, complete edentulism, who qualify for mandibular rehabilitation by means of full-arch prostheses supported by two Nuvo Tapered IF implants and two Tapered CF implants .Informed consent in writing will be obtained from each patient participating in the study prior to any study related procedure.~Before study site activation, the implants of each patient in the study will be randomly allocated (allocation ratio 1:1), so that each patient receives two implants from each group, on each side of the mandibular arch (Group IF: Tapered Implants with internal hexagonal connection; Group CF: Tapered Implants with conical connection). A blocked randomization list will be generated, where the sequence within block corresponds to the quadrant each group of implants shall be inserted (1:right quadrant; 2: left quadrant). The Randomization List will be kept by the Sponsor in the Trial Master File. Although this study is not blinded, access to the randomization list will not be available to the study centers or to the subjects.~Treatment provided to the subjects will be the responsibility of an appropriately qualified dental practitioners (principal investigator and coinvestigator) to provide the relevant patient care under clinical study conditions, In the mandible, four implants will be placed under local anesthesia and with adequate bone bed preparation, as recommended by the manufacturer, being two Tapered IF implants on one side and two Tapered CF implants on the other, according to the established by the randomization results. The implants will be placed at preferably in an axial position for the medial implants and distally angled for the distal ones, depending on bone availability.~Immediately after implant placement, the final insertion torque shall be recorded. The selection of the prosthetic component and loading protocol (late or immediate) shall be conducted according to the need of each subject and to the manufacturer's instructions (IFU). Thus, implant immediate loading may be performed (at the discretion of the surgeon) when all implants present primary stability of at least 35 N.cm. Maxillary rehabilitation will be performed by means of confection of muco-supported dentures.~Data concerning the studied variables (mandibular rehabilitation) will be collected following the procedures and assessments plan by fulfilling the Case Report Form (CRF), in the following stages: First visit (Screening); TP - Implants placement; T0 - Implant loading; T6, T12, T24 and T36 - 6, 12, 24 and 36 months, respectively, thereafter.~Panoramic radiographs, lateral cephalometric radiographs and computed tomography (CT) scans will be obtained from the region of interest prior to surgery, for the surgical planning. Additionally, standardized digital periapical radiographs will be taken in a usual daily practice frequency, as determined by the investigator: after implants placement (TP - immediately or within 1 week after implant placement) and during the post-operative stages (T0, T6, T12, T24 and T36) to assess the osseointegration process, changes in peri-implant bone level as well as prosthetic settlement and integrity.
Nuvo Tapered IF (internal hexagonal connection) and CF (conical connextion) Implants were designed for the the oral functional rehabilitation using dental implants, allowing for treatment of patients with different bone qualities.~The aim of the study is to confirm the long-term safety and clinical performance of implants and abutments of Nuvo IF and CF in daily dental practice setting, by means of prospective collection of clinical data in randomized clinical trial using these devices.~Devices will be used , according to manufacturer indications in the IFU. Patients will be followed for 36 months after implant loading.