The Accuracy and Applicability of 3D Modeling and Printing Blunt Force Cranial Injuries

Area of Science:

• Forensic Anthropology
• Biomechanical Engineering
• 3D Imaging and Printing Technologies

Background:

• Accurate 3D reconstruction of blunt force trauma is crucial for forensic investigations.
• Previous studies have explored 3D modeling but with limited focus on printing accuracy and material properties.

Purpose of the Study:

• To identify factors influencing the accuracy of 3D models and prints of cranial blunt force trauma.
• To evaluate the practical applications and limitations of creating 3D replicas of these injuries.

Main Methods:

• Three types of cranial blunt force lesions (hinge, depressed, comminuted) were documented.
• Surface scanning techniques (laser, structured light, photogrammetry) were used at standard and high quality settings.
• 3D printed models were created using VisiJet® PXL (composite powder) and VisiJet® M3 (acrylic plastic).

Main Results:

• Statistically significant differences were observed between 3D prints and actual bone lesions.
• Despite differences, critical details of the lesions were reproduced with an accuracy of 2 mm.
• Scanning method and quality settings impacted model fidelity.

Conclusions:

• 3D printing offers a viable method for reproducing cranial blunt force trauma with notable accuracy.
• The findings support the use of 3D printed models in forensic science for injury analysis and visualization.
• Further research should explore a wider range of materials and lesion types.