Radiographic evaluation of marginal bone maintenance around tissue level implant and bone level implant: a randomised controlled trial. A 1‐year follow‐up

Abstract

The etiologic factors associated with crestal bone loss have not been comprehensively clarified. Several theories exist as to the reason for the observed changes in crestal bone height following implant restoration. In the 1990s, the wide-diameter implants were commercially introduced. Initially, the implants were restored with standard-diameter abutments because of lack of matching prosthetic components. Long-term radiographic follow-up of these 'platform-switched' restored wide-diameter dental implants has demonstrated a smaller-than-expected vertical change in the crestal bone height around these implants that is typically observed around implants restored conventionally with prosthetic components of matching diameters. The aim of this randomised controlled study was to assess radiographically marginal bone level alterations in implants restored according to the platform-switching concept compared with traditionally restored implants. Fifty-four subjects to participate in this randomised controlled study were selected. Two groups were assigned at random: control group (56 implants were restored with standard matching-diameter abutments) and test group (58 implants were restored with medialised abutments). X-ray explorations were taken for peri-implant bone level at the minute the last cementing of the prosthesis and at 1-year follow-up. NHI Image was used to digitally process and manipulate the radiographic images and perform the measurements. Mean of bone loss with platform-switching implants was -0·01 mm, and the mean of bone loss with standard platform implant was 0·42 mm. Outcomes of this study indicated that the platform-switching design could preserve the crestal bone levels to 1-year follow-up. There was a statistically significant difference in marginal bone loss.

Platform switch versus platform match in the posterior mandible – 1‐year results of a multicentre randomized clinical trial

“…We could demonstrate that PS reduced peri-implant crestal bone resorption at 1-year post-loading. These results are in accordance with previous clinical studies (Cappiello et al 2008, Fernández-Formoso et al 2012, Telleman et al 2012). This is a 5-year ongoing clinical study and further results are necessary to determine if the concept of PS will show superiority in terms of BLC over time, as suggested by other authors (Astrand et al 2004, Vigolo & Givani 2009).…”

Assessment of Marginal Bone Loss around Platform-Matched and Platform-Switched Implants - A Prospective Study

“…Effects of platform switching in limiting the peri-implant MBL have been discussed in both prospective and longitudinal human studies (3,9) and displayed long-term stability (15,16). Conversely, numerous studies have also reported results rejecting the platform-switching concept.…”

Perda óssea marginal peri-implantar: uma revisão de literatura

“…16 Dois estudos não especificaram o tipo de exame de imagem utilizado. 23,26 Em relação ao tipo de conexão, a POM variou de 0,04 ± 0,50 para 2,85 ± 0,64 mm para os implantes cone Morse, 14,16,[18][19][20]24 0,33 ± 0,172 para 1,358 ± 0,3939 mm para hexágono interno, 13,15,17 0,66 ±1,21 para hexágono externo 14,25,26 e 0,00 ± 0,37 para 0,30 ± 0,51 mm para conexão interna tri-channel. 22,23 Quanto ao conceito de plataforma switching, a POM variou de 0,04 ± 0,50 e 0,832 ± 0,4427 mm e 0,42 ± 0,11 para 1,358 ± 0,3939 mm para a plataforma convencional.…”

“…22,23 Quanto ao conceito de plataforma switching, a POM variou de 0,04 ± 0,50 e 0,832 ± 0,4427 mm e 0,42 ± 0,11 para 1,358 ± 0,3939 mm para a plataforma convencional. 13,17,18,25,26 dIscussão A eliminação ou a redução da POM ao redor de implantes dentários é o objetivo de várias estratégias de modificação do procedimento cirúrgico, alteração da superfície e morfologia do implante, tipo de conexão implante-pilar, entre outros. 18 Implantes instalados ao nível da crista óssea exibiram maiores quantidades de POM abaixo da plataforma comparados com implantes colocados 1 ou 2 mm abaixo do nível da crista óssea.…”

“…13,17,18,25,26 dIscussão A eliminação ou a redução da POM ao redor de implantes dentários é o objetivo de várias estratégias de modificação do procedimento cirúrgico, alteração da superfície e morfologia do implante, tipo de conexão implante-pilar, entre outros. 18 Implantes instalados ao nível da crista óssea exibiram maiores quantidades de POM abaixo da plataforma comparados com implantes colocados 1 ou 2 mm abaixo do nível da crista óssea. Além disso, implantes colocados abaixo do nível da crista óssea apresentaram maior percentual de superfícies com osso formado na plataforma do implante em comparação com os implantes colocados ao nível da crista óssea.…”