التخطيط الافتراضي لترميم الاستئصالات الجراحية للفك السفلي باستخدام الصور الرقمية و تقنية العناصر المنتهية : دراسة حالة مرضية

الملخص EN

Background & Objective: Reconstruction of mandibular defects after trauma or tumor resection is one of the most challenging problems facing by maxillofacial surgeons.

Few mandibular defects require not just a fixation of an implant, but the reconstruction of the entire mandible.

The aim of this study was to design a mandibular prosthesis for a mandibular cancer patient and study its efficacy by stress–strain related mechanical property using finite element analysis (FEA).

Methods & Materials: One elderly male diagnosed as having mandibular cancer was included in the study.

Multi-sliced computed tomography (CT) images of mandible were obtained under standard conditions.

The images was analyzed by Materialise’s Interactive Medical Image Control System (Mimics) software and Catia software.

After applying suitable mechanical property of the bone, the biting and chewing forces were applied on the specific regions of the bone in the following cases: 1) normal mandible; 2) reconstructed mandible.

The maximum value of von Mises stress, and the vector sum of displacement were measured.

Results: The specific softwares were evaluated through this study toward the needed steps for designing and analyzing the individual 3D models starting from the CT images.

As expectedly, in reconstructed mandible, the measured maximum values of Von Mises stress (Pa) as well as the vector sum of the displacement were increased by 36% and 10% respectively, when compared to the normal mandible.

Conclusion: It was shown that, the mechanical behaviour of the reconstructed mandible was close to the same of the normal bone.

It is highly recommended to adopt such specialized softwares for images processing and for virtual surgery planning before the real operation, which would save the operation time and give more perspectives towards the optimal restorative model and the best fixation method.