Stress Distribution Around Single Short Dental Implants: A Finite Element Study

Area of Science:

• Biomaterials Science
• Dental Implantology
• Biomechanics

Background:

• Posterior mandibular bone height limitations, due to resorption or anatomy, often necessitate shorter dental implants.
• Shorter implants may compromise osseointegration and success rates compared to longer implants (≥10 mm).
• Understanding stress distribution in bone with varying implant lengths is crucial for predictable outcomes.

Purpose of the Study:

• To compare and evaluate the influence of different dental implant lengths on stress distribution in the posterior mandibular bone.
• To analyze stress patterns under static vertical and horizontal loading conditions.

Main Methods:

• A 3D finite element model of the posterior mandible was created using CT scan data.
• Four simulated implants of lengths 6 mm, 8 mm, 10 mm, and 13 mm were analyzed.
• Static vertical (250 N) and horizontal (100 N) forces were applied to evaluate Von Mises stress in cortical and cancellous bone.

Main Results:

• Under static vertical load, 6 mm implants showed stress comparable to 8 mm and 10 mm implants, and less than 13 mm implants.
• Under static horizontal load, 6 mm implants experienced less Von Mises stress compared to 8 mm, 10 mm, and 13 mm implants.
• Shorter implants may transfer more stress to surrounding bone under horizontal loading, while bearing more load under vertical loading.

Conclusions:

• Implant length significantly influences stress distribution in the posterior mandible.
• Findings suggest that while shorter implants may experience less stress under horizontal loads, their performance under vertical loads and long-term osseointegration require careful consideration.
• Further research is needed to optimize implant length selection based on specific anatomical and functional conditions.