NanoTite surface implants stability in the anorganic bovine bone grafted maxillary sinus measured by resonance frequency analysis: 3 years report

Purpose: The primary aims of this study were to: (1) investigate value and possible advantages in terms of survival rate of NanoTiteTM surface implants used in critical bone conditions such as the severely atrophic posterior maxilla (residual bone height 3-6 mm) simultaneously reconstructed with sinus floor elevation technique utilizing nonabsorbable membrane and anorganic bovine bone (Bio-Oss Geistlich Pharma AG) as only graft material, and (2) examine the reliability of resonance frequency analysis (RFA) measurements to assess and monitor implant stability also in such cases. Materials and Methods: Five consecutive patients presenting severely atrophic posterior maxillae were treated with 12 NanoTiteTM surface implants in conjunction with sinus lifting using nonabsorbable membrane and Bio-Oss as only graft material. Resonance frequency analysis measurements (Osstell Mentor TM; Ostell AB) was carried out at implant placement and four months, six months, and three years postoperatively. Results: At 3-year follow-up the survival rate of NanoTiteTM surface implants was 100%. RFA mean value was 58.75 implant stability quotient (ISQ) at implant placement time and gradually increased during the examination time ending with an average ISQ of 75 at 3-year follow-up. Conclusions: Although the present investigation is based on a limited sample, its results support the possible benefits of utilizing NanoTiteTM surface implants in case of implant placement and simultaneous reconstruction of the severely atrophic posterior maxilla trough sinus elevation technique. Resonance frequency analysis system appears to be a reliable method to assess and monitor implant stability also in case of severely atrophic posterior maxilla (residual bone height 3-6 mm) simultaneously grafted with anorganic bovine bone alone.