55 year old patient, ex-smoker for 3 months, hypertension controlled with Emconcor 2.5 mgrs. 1.0.0.   Presents: absences in 17, 16, 26, 27, 38, 37, 36, 46 and 47. Root remnants at 25 and 28   The rest of the teeth present different degrees of Chronic Periodontal Disease: advanced with impossible prognosis in 18, 32,31,41,42 and 48 and advanced and moderate with doubtful prognosis in the rest of the teeth.   After periodontal study, assembly of models in articulator and maxillary and mandibular scanner, we decided to extract all the remaining pieces and place four maxillary implants (15, 11, 21 and 25) according to the All-on-four technique and four mandibular implants (35, 32, 42 and 45).   Guided tissue regeneration was carried out by means of biotrimming of the patient's own teeth and platelet-rich plasma from aspirated cancellous bone. The lack of cortex in the coronal area of pieces 35 and 45 made it advisable to use a full veneer pendant and not to perform immediate loading. We loaded provisional hybrid prosthesis to the maxilla and removable prosthesis to the mandible with Vulkan Locators in pieces 32 and 42. At 5 weeks we observed failure of the implant in position 32, we performed exodontia plus curettage and placed another implant of superior diameter, we placed another one in zone 33 in anticipation of possible bad evolution of the one in zone 32 that presented a notable inflammatory aspect. At two months, all the implants showed d'Ostell values from 71 to 76.   We performed a keratinized gingival augmentation pendant at 32 and 33 because the bone disposition had forced us to a lower placement. We obtained a keratinized gingival band of 3 to 5 mm. We placed hybrid prosthesis of maxillary titanium-zirconium on 4 implants and in the mandibular area on 5 implants Vulkan Conical Connection.