Human mandibular trabecular bone density correlation with mechanical strength: implications for implant dentistry.

Area of Science:

• Oral and Maxillofacial Surgery
• Biomaterials Science
• Radiology

Background:

• Dental implant prognosis relies heavily on bone mechanical properties for initial stability, especially with immediate loading procedures.
• Accurate preoperative assessment of bone quality is crucial for successful dental implant integration.
• Quantitative computed tomography (QCT) offers a method to measure bone mineral density (BMD) in trabecular bone, a key factor in implant survival.

Purpose of the Study:

• To investigate the correlation between BMD measured by QCT and the mechanical strength of human cadaver mandibles.
• To evaluate the utility of QCT in predicting the mechanical properties of mandibular bone for dental implant planning.

Main Methods:

• Bone mineral density (BMD) of 58 trabecular bone specimens from 6 human cadaver mandibles was determined using QCT.
• Compressive strength to the breaking point was measured using a mechanical testing device.
• Specimens were prepared by washing and weighing.

Main Results:

• Mean BMD values varied across mandibular regions: anterior (633.3 mg/mL), premolar (571.0 mg/mL), and molar (518.3 mg/mL).
• Mean compressive strengths were 0.237 kN (anterior), 0.216 kN (premolar), and 0.196 kN (molar).
• Significant positive correlations were found between BMD and mechanical strength (R=0.77) and ash weight and mechanical strength (R=0.84).

Conclusions:

• A strong correlation exists between mandibular bone strength, bone mineral content, and bone density as measured by QCT.
• QCT is an effective preoperative diagnostic tool for assessing bone mechanical properties.
• Utilizing QCT can improve the selection of dental implants for optimal initial stability and enhance patient prognosis.