Sinus elevation with a cortical bone graft block: a patient-specific three-dimensional finite element study.

Area of Science:

• Biomaterials Science
• Dental Implantology
• Biomechanics

Background:

• Sinus elevation procedures are common in dental implantology.
• Stabilizing implants in grafted sinuses can be challenging.
• Finite element analysis (FEA) is a valuable tool for simulating biomechanical behavior.

Purpose of the Study:

• To conduct a finite element (FE) analysis of a modified sinus elevation technique using a cortical bone graft block for implant stabilization.
• To compare the modified technique with the standard sinus augmentation procedure.
• To evaluate the accuracy of simplifying dental implant models into cylinders in FEA.

Main Methods:

• Three-dimensional FE models of the maxilla were created from CT data.
• Models represented conventional and modified sinus elevation procedures, including a cortical bone graft block.
• Both threaded implants and simplified cylinders were analyzed under various occlusal loads.

Main Results:

• Maximum von Mises stresses were significantly lower in the modified sinus graft models compared to the conventional technique.
• No significant differences in stress were found between threaded implants and simplified cylinder models.
• The FE model simplification did not compromise outcome accuracy.

Conclusions:

• Incorporating a cortical bone graft block during sinus elevation can effectively reduce stress around dental implants.
• Simplified cylindrical implant models are suitable for FEA in this context.
• This modified technique may enhance implant stability and longevity in grafted sinuses.