The Clinical Evaluation On Sinus Floor Elevation Surgery In Sites With Residual Bone Height <5mm

Objective:To compare the clinical and radiographic outcomes of implants concomitantly placed in atrophic maxilla using osteotome sinus floor elevation(OSFE)or lateral window sinus floor elevation(LSFE).Material and methods:Patients treated with OSFE or LSFE from January 2014 to December 2015,with concomitant implant placement were collected.According to pre-operative CBCT,those with RBH<5mm were included in this study and were further divided into OSFE group and LSFE group.Clinical and radiographic examinations at 0,6,12,18 and 24 months after implant installment,like implant success rate(ISR),apical implant bone height(ABH),endo-sinus bone gain(ESBG)were evaluated and analyzed.Results:A total of 40 patients with 40 implants were included.At 24-month follow-up visit,all implants survived and obtained satisfactory clinical outcomes.ESBG and ABH measured immediately after surgery were significantly higher in LSFE group(9.89±2.08 mm and 3.25±1.84 mm respectively),than those in OSFE group(8.54±1.80 mm and 2.13±1.64 mm respectively).Moreover,during 2-year follow-ups,ESBG and ABH were always remarkably higher in LSFE group.However,bone height decreased over time in both groups,with OSFE group reaching stability 6 months earlier than LSFE group.At the end of observation,both groups obtained a high EBICR.Conclusion:Both OSFE and LSFE are highly predictable at sites with RBH < 5 mm during2-year observation when implants are concomitantly placed.In addition,in cases that the access for lateral window preparation is limited,OSFE procedure should be considered as an effective alternative for LSFE to avoid unnecessary complications.