Biomechanical comparison of polylactide-based versus titanium miniplates in mandible reconstruction in vitro - 17/09/20
, K. Sellenschloh c, V. Polster c, M. Heyland d, M. Vollmer c, M.M. Morlock c, M. Heiland a, G. Huber c, C. Rendenbach a, bBienvenue sur EM-consulte, la référence des professionnels de santé.
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Abstract |
Objectives |
Evaluation of the mechanical integrity and reliability of polylactide-based miniplates for osseous free flap fixation at the mandible in an experimental study setup of a mandible reconstruction model.
Material and methods |
1.0mm titanium miniplates (group TI) (MatrixMandible, DePuy Synthes, Umkirch, Germany) and 1.5mm polylactide miniplates (group PL) (Inion CPS, Inion Oy, Tampere, Finland) were used to fix a polyurethane (PU) fibula segment to a PU mandible reconstruction model using monocortical non-locking screws. Mastication was simulated via unilateral cyclic dynamic loading at 1Hz with increasing loads (+ 0.15N/cycle, Bionix, MTS, USA). A 3D optical tracking system (Aramis, GOM, Braunschweig, Germany) was used to determine interosteotomy movements (IOM).
Results |
IOM were higher in the polylactide group (distal: P=0.001, mesial: P=0.001). Differences in mean stiffness (titanium: 478±68N/mm; polylactide: 425±38N/mm, P=0.240) and mean force at a vertical displacement of 1.0mm (titanium: 201.6±87.1N; polylactide: 141.3±29.9N, P=0.159) were not significant.
Conclusions |
The results of this study suggest that polylactide-based miniplates provide reduced mechanical integrity and higher interosteotomy movements in comparison to titanium miniplates in vitro. Indications for clinical use of polylactide-based miniplates in mandible reconstruction have to be placed critically. Future studies will focus on clinical complications of polylactide-based plates in risk patients.
Le texte complet de cet article est disponible en PDF.Keywords : Polylactide, Mandible reconstruction, Fibula free flap, Fatigue strength, Biomechanics, Mechanical integrity
Plan
Vol 121 - N° 4
P. 377-382 - septembre 2020 Retour au numéro
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