All-on-four rehabilitation using photogrammetric impression technique.

Conventional implant impression techniques may introduce distortions in the framework that can lead to a lack of accuracy of the prostheses. Misfit between the restoration and the implants facilitates the occurrence of biomechanical failures and prostheses complications due to inadequate stress dissipation. Digital impressions present an alternative to eliminate procedural distortions by improving the fit between the restoration and the implants. Among the different types of digital impressions, photogrammetry has emerged as an alternative for multiple implant impressions. This case report describes photogrammetric technique for a full-arch rehabilitation in All-on-four of a 68-year-old patient with a fixed implant-supported restoration on the mandible. Photogrammetric technique has demonstrated to be a successful digital alternative to conventional multiple-implant impression. Esthetics and function remained stable over a follow-up period of 1 year. No biomechanical or biologic complications were observed.

Revisión de la pérdida ósea periimplantaria relacionada con la proporción coronaimplante / Review of the periimplant bone loss related to the corona-implant proportion

El objetivo de este trabajo es valorarla posible asociación entre las proporciones corona-implante (C/I) de las restauraciones implantosoportadas y la pérdida de hueso crestal periimplantario. Tras la revisión de 1.064 implantes colocados en 416 pacientes -incluidos en los diversos artículos consultados-, se analizaron las diversas variables que pueden influir en la pérdida ósea periimplantaria (proporción corona-implante y relación entre ambas). No se ha encontrado asociación entre dichas variables, a excepción de uno de los estudios, en el que se estableció una relación inversamente proporcional entre la proporción C/I y la pérdida ósea periimplantaria. La proporción C/I per se no está asociada a la pérdida de hueso (complicaciones biológicas); sin embargo, algunos autores han (..) (AU)

The objective of this work is to assess the possible association between the crown implant ratio (C/I) of the implant-supported restorations and the peril-implant crestalbone loss. After reviewing 1,064 implants placed in 416 patients –including those in the different articles consulted- the different variables were analysed that may influence the peri-implantbone loss (crown-implant ratio and the relation between them). No association was found between these variables, except in one of the studies, in which an inversely proportional relation was established between the C/I proportion and the peri-implant boneloss. The C/Iratio per se is not associated to boneloss (biological complications); however, some authors have demonstrated that it may (..) (AU)