Mali Niyombandith

Panu Suptraviwat

Prisana Pripatnanont

Henk Tideman

Keywords :

mandibular reconstruction, mechanical strength, modular endoprosthesis, reconstruction plate, stress-strain distribution

Abstract :

This study aimed to evaluate mechanical strength of the modular endoprosthesis and the mandibular reconstruction plate in bridging the lateral-defect of mandibles in miniature pigs, and to evaluate the stress and strain occurred on bone. Nine fresh mandibles were divided into 3 groups. Three resected mandibles were reconstructed with 2.7 mm non-locking stainless steel reconstruction plates. Three mandibles were reconstructed with modular endoprosthesis and the other three were intact mandibles as a control. Yield strength was conducted to all mandibles. Stress and strain distribution were measured at the reconstruction sides. For the results, the average yield load of the plate reconstruction group (63.3 ± 20.8 N) was less than the endoprosthesis reconstruction (223.3 ± 92.9 N) and the control group (173.3 ± 64.2 N). The mean strain in the endoprosthesis group was higher than the control group and the reconstruction plate group respectively. The mean stress on bone in the endoprosthesis group was higher than the reconstruction plate group and the control group respectively. For conclusion, modular endoprosthesis for bridging the lateral defect of mandible performs more stability than the reconstruction plate and can withstand the functional limit of biting force under high strain and stress.

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