A comparative biomechanical evaluation of mandibular condyle fracture plating techniques.
OBJECTIVE
The aim of this study was to comparatively evaluate the resistance of 3 plating rigid internal fixation techniques for mandibular condylar process fractures.


METHODS
Synthetic hemi-mandible replicas made in polyurethane were used to evaluate a control, and 3 mandibular condyle plating techniques using 2-mm system plates and screws. The plating techniques were fixation with a 4-hole plate and 4 6-mm screws, fixation with a 4-hole plate and 4 8-mm screws and fixation with 2 4-hole plates with 4 6-mm screws each. Each group was subjected to linear loading in medial to lateral and anterior to posterior directions by an Instron 4411 servohydraulic mechanical testing unit (Instron Corp, Norwood, MA). Load peak value and peak displacement were measured. Means and standard derivations were derived and compared for statistical significance using an analyses variance (P < .05) and compared by Tukey test.


RESULTS
Statistically significant differences were noted between fixation groups for the different mechanical measures evaluated under the different directions of linear loading. The 2-plate fixation system presented better behavior, followed by 1 plate with 4 8-mm screws and 1 plate with 4 6-mm screws. The fixation systems used were more resistant to antero-posterior load and the use of 8-mm screws improved the resistance of the fixation when compared with 6-mm screws only in the antero-posterior test.


CONCLUSIONS
Under the conditions tested the 2-plate fixation system provided the most favorable mechanical behavior. We can suggest that lengthy screws, with bicortical engagement, can increase the stability at fixation of mandibular condylar process fractures.
Oral Maxillofacial Surgery, State University of Campinas, Piracicaba Dental School, São Paulo, Brazil. asprino@fop.unicamp.br
Luciana
L
Asprino
Simonides
S
Consani
Márcio
M
de Moraes
D000704:Analysis of Variance; D001696:Biomechanical Phenomena; D001860:Bone Plates; D003799:Dental Stress Analysis; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005593:Fracture Fixation, Internal / Q000295:instrumentation*; D006801:Humans; D008335:Mandibular Condyle / Q000293:injuries* / Q000601:surgery; D008337:Mandibular Fractures / Q000601:surgery*; D008422:Materials Testing; D008953:Models, Anatomic; D011140:Polyurethanes; D018709:Statistics, Nonparametric; D013314:Stress, Mechanical
D011140:Polyurethanes