Effect of Repeated Removal and Re-placement of Abutments Around Dental Implants

Effect of Repeated Removal and Re-placement of Laser Microgrooved and Machined Abutments on Proinflammatory Cytokine Levels Around Dental Implants

Repeated removal and re-placement of healing and prosthetic abutments result in frequent injuries to the soft tissues. The purpose was to evaluate the effect of repeated removal and re-placement of laser microgrooved and smooth/machined healing and prosthetic abutments during restorative stages, and 1 year after functional loading, on proinflammatory cytokine levels around dental implants.

Twenty-four patients each received 2 one-stage implants in a split mouth design on the same jaw. In each patient one healing and prosthetic abutments with a laser microgrooved surface (LMS group) and one healing and prosthetic abutments with smooth/machined surface (S/MS group) were used. Four months following implant placement [Baseline (BSL)], the healing abutments were disconnnected and reconnected three times to carry out the impression procedures and metal framework try-in. Four weeks later (T0), definitive prosthetic abutments were installated with screw retained crowns. Samples for immunological analyses were taken from the sulcus around each implant at BSL, T0, and 1 year after functional loading (T1). Peri-implant crevicular fluid samples were analyzed for interleukin-1beta (IL-1β), interleukin-6 (IL-6) and tumor necrosis factor (TNF)-α levels using the ELISA kit.

The gingival fluid production was measured electronically in Periotron units, (Periotron 8000®, Ora Flow, Inc., Plainview, NY, USA) which were converted to microliters (μl) by MCCONVRT software (Ora Flow).

Inclusion Criteria: 18 years or older, in good general health, and with sufficient amount of bone available to place a standard implant Exclusion Criteria: natural teeth adjacent to surgical area affected by untreated periodontal or endodontic infections, peri-implant bone defects requiring bone augmentation, absence of opposing occlusion,

Guarnieri R, Miccoli G, Reda R, Mazzoni A, Di Nardo D, Testarelli L. Laser microgrooved vs. machined healing abutment disconnection/reconnection: a comparative clinical, radiographical and biochemical study with split-mouth design. Int J Implant Dent. 2021 Mar 17;7(1):19. doi: 10.1186/s40729-021-00301-6.