Inclusion Criteria:  Age ≥ 18 years Have planned a fixed multiple prosthesis supported by implants <6.5 mm in length and implants ≥ 6.5 mm in length within 15 days before the inclusion of the patient in the study. Planning of supported prostheses from 2 to 4 implants dental Have a previously performed CBCT (Cone Beam Computed Tomography) Availability to be observed during the period of tracing Signature of the informed consent  Exclusion Criteria:  Smokers> 10 cigarettes / day Complete prostheses Unitary prostheses