Could rhombic shaped miniplates be applicable for subcondylar fractures
of mandible?: A biomechanical study
Abstract
Purpose: Fractures of the mandibular condylar process are the
most common fractures in the maxillofacial region. Surgical treatment of
condylar region fractures with miniplates and miniscrews has become
quite popular because it is a stable method and allows for immediate
function. The present study examined sheep hemimandibular subcondylar
fracture models to evaluate the biomechanical properties of two
miniplate/screw system types, which are used to surgical fixation of
subcondylar fractures. Experimental: The experimental
standardized subcondylar fracture lines were examined in ten sheep
hemimandibula models. Each segment was fixated with one of two fixation
types: double straight miniplates with eight miniscrews or single, one
rhombic-shaped miniplate with five miniscrews. All models were mounted
in a servohydraulic testing unit, and continuous linear force was
loaded. The maximum force and displacement values were compared and
analyzed statistically. Results: The rhombic miniplate group
had statistically significantly lower values than the double straight
miniplate group for maximum force, work at maximum load, and hardness.
There was no statistically significant difference between the two groups
in terms of displacement at maximum load. Conclusion:
Considering the advantages of rhombic shaped miniplates, they are
suggested as a clinically reliable treatment alternative for the
surgical fixation of subcondylar fractures.