Validating cone-beam computed tomography for peri-implant bone morphometric analysis.

Area of Science:

• Dental Implantology
• Biomaterials Science
• Radiology

Background:

• Trabecular bone analysis around dental implants is crucial for assessing osseointegration.
• Cone-beam computed tomography (CBCT) offers a non-invasive imaging modality for evaluating bone structure.
• Histology provides a gold standard for detailed bone morphometry but is invasive.

Purpose of the Study:

• To validate the use of high-resolution CBCT for three-dimensional (3D) peri-implant trabecular bone morphometry.
• To compare CBCT-derived bone morphometric parameters with traditional two-dimensional (2D) histology.
• To assess the diagnostic potential of CBCT in characterizing peri-implant bone quality.

Main Methods:

• Ex vivo high-resolution CBCT (80 µm) scanning of 36 canine alveolar bone samples (27 with implants, 9 without).
• Decalcification and thin sectioning (∼6 µm) for high-contrast 2D histological imaging.
• Quantitative analysis of trabecular number (Tb.N), thickness (Tb.Th), separation (Tb.Sp), and bone volume fraction (BV/TV) using CTAn software.

Main Results:

• CBCT imaging revealed significantly higher Tb.Th and Tb.Sp, and lower BV/TV and Tb.N compared to histology (P<0.001).
• Moderate to high correlations (r=0.65-0.85) were observed between CBCT and histological measurements for peri-implant bone structure.
• Bland-Altman analysis indicated strongest agreement for Tb.Th, followed by Tb.Sp, Tb.N, and BV/TV, irrespective of implant presence.

Conclusions:

• High-resolution CBCT measurements of peri-implant trabecular bone are representative of histological bone characteristics.
• CBCT demonstrates potential as a reliable clinical diagnostic tool for peri-implant bone morphometric characterization.
• This validates CBCT's utility in assessing bone quality around dental implants non-invasively.