Guerrero, María DoloresCid, GonzaloOliva, Patricio2018-03-022018-03-022016International journal of odontostomatology, 2016, vol.10, n.3, pp.399-407http://hdl.handle.net/11447/2035http://dx.doi.org/10.4067/S0718-381X2016000300005The purpose of this study was to evaluate the bone level and the success and failure of loaded implants positioned immediately after extraction for full-arch restorations and compare the results obtained with implants placed in healed alveoli, in a period of 12 months, to determine the best alternative. A systematic review based on prospective randomized clinical trials, and randomized or nonrandomized controlled and uncontrolled trials evaluating failure and bone resorption of immediate loaded implants, positioned in post extraction and healed sockets in adult patients for full arch rehabilitations. Data from clinical trials were entered into Review Manager® software. Two meta-analyzes for different variables to analyze and subsequently a sensitivity analysis to eliminate bias caused studies were performed. From a total of 431 implants studied, 16 of them failed, 11 of which had been positioned immediately after the extraction. Three of the authors of the review considered agree that there are more successful and less bone loss in implants positioned so late. To implant-supported full-arch restorations fixed or removable, late positioning protocol proved to be a better alternative since it showed a lower failure rate and less bone loss.8 p.en-USRestoring full archDental implantAlveolar resorptionImmediate loadingImmediate positionLate positionArtículo