Akademik Veri Yönetim Sistemi
Turkish Association of Oral and Maxillofacial Surgery 32nd International Scientific Congress, Antalya, Türkiye, 5 - 09 Kasım 2025, ss.241-253, (Tam Metin Bildiri)
Objective: The aim of this study was to investigate the biomechanical stability of locking reconstruction plates
with different profile thicknesses, used in the reconstruction of lateral segmental mandibular defects, under incisal
loading in both grafted and non-grafted conditions. Materials and Methods: Twenty polyurethane mandibles (N=20)
were fabricated by molding a demonstrational model. A standardized 5.5 cm lateral segmental defect was
created in each specimen, extending from the distal of the right canine to the distal of the right second molar.
Specimens were randomly allocated into four groups (n=5): LP (2.0 mm low-profile plate), LPg (2.0 mm low-profile
plate +graft), HP (2.5 mm high-profile plate), and HPg (2.5 mm high- profile plate + graft). Fixation was
performed using 2.4 mm L-shaped locking reconstruction plates and 2.4 mm diameter, 10 mm length locking
screws, with three screws per mandibular segment. In graft groups (LPg and HPg), a 5.0 cm × 1.5 cm polyurethane
segment was adapted to simulate a fibula graft and stabilized with three additional screws through the plate. All
specimens underwent progressive uniaxial incisal loading from 10 N to 250 N using a universal testing machine, with
load–displacement curves recorded at 10 N intervals. Statistical analysis was performed using one-way ANOVA, with
post hoc comparisons by Tukey or Tamhane T2 tests depending on variance homogeneity. The significance level
was set at p<0.05.
Results: No significant differences were observed up to 80 N. From 90 N to 250 N, a significant difference was found
only between the HPg and HP groups (p<0.05). No other pairwise comparisons reached significance.
Conclusion: Within the limitations of this study, it may be concluded that graft placement does not influence the
stability of low-profile fixation systems, whereas in high-profile systems, the addition of a graft is more likely to be
associated with increased displacement compared to graft-free constructs under incremental incisal loading.
Keywords: biomechanical stability, mandibular segmental defect, reconstruction plate