Modified internal sinus elevation for patients with low residual bone height: A retrospective clinical study

Area of Science:

• Oral and Maxillofacial Surgery
• Dental Implantology
• Biomaterials Engineering

Background:

• Modified internal sinus elevation combines sinus mucoperiosteum stripping to expand indications.
• Long-term clinical follow-up and 3D finite element analyses for this technique are limited.

Purpose of the Study:

• To assess the feasibility of modified internal sinus floor elevation in patients with low residual bone height.
• To evaluate long-term clinical outcomes using a 3D finite element model.

Main Methods:

• 99 implants placed in 86 patients, with follow-up ranging from 3-24 months.
• Dynamic simulation of modified internal sinus floor elevation using a 3D finite element model.
• Measurement of sinus membrane stress during the procedure.

Main Results:

• Modified internal sinus elevation (Group A) achieved a 6.5 mm lift with an 8.8% perforation rate and 96.5% implant survival.
• External sinus floor elevation (Group B) achieved an 8.8 mm lift with a 14.3% perforation rate and 100% implant survival.
• FEA indicated peak membrane stress increases with elevation height and separation degree.

Conclusions:

• The modified internal sinus elevation procedure demonstrates positive clinical outcomes in patients with low residual bone height.
• This technique is a feasible and effective option for dental implant placement in patients with limited bone height.