Many researches in the last years had focused their attention on the best options to preserve the buccal plate and soft tissue especially in the aestethic zone.
To avoid all the possible stresses that occur on peri-implant tissues, One Abutment-One Time (OAOT) treatment has been suggested. In fact, as reported in literature, repeated abutment disconnections might produce a biological and microbiological damage to the tissue/abutment/implant complex, with relating bone loss.
The patients included in the study, after six months from extraction, underwent the placement of a Premium Kohno implant (Sweden & Martina, Due Carrare, Padua, Italy). Two months afterwards, an immediate definitive abutment with first a provisional and then a final crown connection was cemented.
The aim of the study was to investigate the response of the hard tissue to OAOT protocol. Thus, bone level changes and the influence on bone remodelling by Thin or Thick biotype were evaluated.
At five year follow-up, the 22 implants evaluated in the study resulted clinically osseointegrated, stable, and showed no sign of infection. The results showed statistically significant differences in bone absorption after one year, thereafter, the rate of bone loss is lower and not statistically significant. No statistically significant differences were founded between the two groups Thin versus Thick.
Therefore, it can be reasonably affirmed that OAOT procedure combined with the implants allows to obtain stable bone levels in both biotype. The outcome accords with international literature which, however, usually presents a follow-up period of three years. At five year of follow up, the results indicate that the OAOT approach can be carried out successfully and it is a predictable and reliable approach over time.
