Relative Contribution of Trabecular and Cortical Bone to Primary Implant Stability: An In vitro Model Study

Area of Science:

• Biomaterials Science
• Dental Implantology
• Orthopedic Biomechanics

Background:

• Primary implant stability is essential for osseointegration and the longevity of dental implants.
• The specific roles of trabecular and cortical bone in achieving primary stability remain incompletely understood.

Purpose of the Study:

• To investigate and compare the contribution of different types and densities of bone to primary dental implant stability.
• To elucidate the relationship between bone quality and initial implant anchorage.

Main Methods:

• An in vitro model utilized synthetic bone blocks simulating low and high-density trabecular and cortical bone.
• Forty implants were placed across four groups, with primary stability measured via insertion torque and resonance frequency analysis (RFA).

Main Results:

• High-density cortical bone yielded the highest primary stability (45 Ncm torque, 75 ISQ).
• Low-density cortical bone showed moderate stability (30 Ncm torque, 60 ISQ).
• High-density trabecular bone (25 Ncm torque, 55 ISQ) and low-density trabecular bone (15 Ncm torque, 45 ISQ) demonstrated progressively lower stability.

Conclusions:

• Cortical bone, particularly high-density types, significantly enhances primary implant stability over trabecular bone.
• Bone quality is a critical determinant for optimizing primary stability and ensuring successful long-term dental implant outcomes.