Akademik Veri Yönetim Sistemi
EUROPEAN ORAL RESEARCH, cilt.59, sa.1, ss.40-45, 2025 (ESCI, TRDizin)
Purpose
The purpose of this study was to evaluate the distribution of stresses in screw and
plate fixation systems during simulated advancement genioplasty using finite
element analysis.
Materials and Methods
A cone-beam computed tomography image of a patient was used to create threedimensional virtual models of mandibular bone. Chin advancement of 8 mm was
simulated following a horizontal osteotomy of the chin in a computer-aided design
program. The distal segment was stabilized with two titanium mini-screws placed
bilaterally in the first model and a single 4-hole titanium pre-bent chin plate placed
centrally in the second model. The plate was fixed with four mini-screws, two in the
proximal and two in the distal segment. All fixative appliances were submitted to 15
N force applied backwards to the lingual surface of the chin parallel to the occlusal
plane and 7 N force applied upwards to the buccal surface of the chin perpendicular
to the occlusal plane. The distributions of von Mises stresses and deformations in
bone and titanium materials were evaluated.
Results
In the screw fixation system (22.52 MPa) higher stress values were observed
compared to the plate fixation system (13.71 MPa). The deformation value was
higher for the screw fixation system (0.021 mm) than the plate fixation system
(0.0007 mm).
Conclusion
In advancement genioplasty, fixation with a single pre-bent centrally placed chin
plate showed slightly better stabilization than fixation with two bilaterally placed
bicortical screws. The stress values were within the physical strength limits of bone
and titanium for both systems.