In vitro mechanical test of grid plates for mandibular angle fractures


      This study evaluated, by mechanical testing, the strength of four-hole grid plates used for mandibular angle fracture fixation. Much has been discussed about the treatment of mandibular fractures with straight or curved plates. However, there are few studies about the use of grid plates. The geometry of such plates provides three-dimensional stability, resistance against torque associated with a low profile. Ninety polyurethane hemimandibles were used as substratum. The hemimandibles were divided into nine groups and fixation of the fractures was performed varying the type and position of plate and type of screw. An intact hemimandible group was used as control. It was possible to observe that plates positioned at the tension zone present the highest load values, both for dislocations of 3 and 5 mm. There was no statistical difference when plates with or without an intermediate bar were tested. The locking screws were more efficient than the non-locking screws when the plates were positioned at the neutral zone. Results allowed us to conclude that grid plates installed at the tension zone presented greater mechanical efficiency. If grid plates are positioned at the neutral zone, they should have an intermediate bar and be fixed with locking screws.


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        • Guimond C.
        • Johnson J.V.
        • Marchena J.M.
        Fixation of mandibular angle fractures with 2.0mm 3-dimensional curved angle strutplate.
        J Oral Maxillofac Surg. 2005; 63: 209-214
        • Hochuli-Vieira E.
        • Ha T.K.
        • Pereira-Filho V.A.
        • et al.
        Use of rectangular grid miniplates for fracture fixation at the mandibular angle.
        J Oral Maxillofac Surg. 2011; 69: 1436-1441
        • Jain M.K.
        • Manjunath K.S.
        • Bhagwan B.K.
        • et al.
        Comparison of 3-dimensional and standard miniplate fixation in the management of mandibular fractures.
        J Oral Maxillofac Surg. 2010; 68: 1568-1572
        • Alkan A.
        • Celebi N.
        • Ozden B.
        • et al.
        Biomechanical comparison of different plating techniques in repair of mandibular angle fractures.
        Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2007; 104: 752-756
        • Barry C.P.
        • Kearns G.J.
        Superior border plating technique in the management of isolated mandibular angle fractures: a retrospective study of 50 consecutive patients.
        J Oral Maxillofac Surg. 2007; 65: 1544-1549
        • Assael L.A.
        Treatment of mandibular angle fractures: plate and screw fixation.
        J Oral Maxillofac Surg. 1994; 52: 757-761
        • Feledy J.
        • Caterson E.J.
        • Steger S.
        • et al.
        Treatment of mandibular angle fractures with a matrix miniplate: a preliminary report.
        Plast Reconstr Surg. 2004; 114: 1711-1718
        • Gear A.J.
        • Apasova E.
        • Schmitz J.P.
        • et al.
        Treatment modalities for mandibular angle fractures.
        J Oral Maxillofac Surg. 2005; 63: 655-663
        • Champy M.
        • Lodde J.P.
        Mandibular synthesis. Placement of the synthesis as a function of mandibular stress.
        Rev Stomatol Chir Maxillofac. 1976; 77 (paper in French): 971-976
        • Asprino L.
        • Consani S.
        • de Moraes M.
        A comparative biomechanical evaluation of mandibular condyle fracture plating techniques.
        J Oral Maxillofac Surg. 2006; 64: 452-456
        • Paulus G.W.
        • Steinhauser E.W.
        A comparative study of wire osteosynthesis versus bone screws in the treatment of mandibular prognathism.
        Oral Surg Oral Med Oral Pathol. 1982; 54: 2-6
        • Spiessl B.
        Perspectives of maxillary surgery in Switzerland.
        Helv Chir Acta. 1989; 55 (paper in German): 953-958
        • Piffkò J.
        • Homann C.H.
        • Schuon R.
        • et al.
        Experimental study on the biomechanical stability of different internal fixators for use in the mandible.
        Mund Kiefer Gesichtschir. 2003; 7 (paper in German): 1-6
        • Michelet F.X.
        • Deymes J.
        • Dessus B.
        Osteosynthesis with miniaturized screwed plates in maxilla-facial surgery.
        J Maxillofac Surg. 1973; 1: 79-84
        • Gutwald R.
        • Schön R.
        • Metzger M.
        • et al.
        Miniplate osteosynthesis with four different systems in sheep.
        Int J Oral Maxillofac Surg. 2011; 40: 94-102
        • Bayat M.
        • Garajei A.
        • Ghorbani K.
        • et al.
        Treatment of mandibular angle fracture using a single biosorbable miniplate.
        J Oral Maxillofacial Surg. 2010; 68: 1573-1577
        • Chiodo T.A.
        • Ziccardi V.B.
        • Janal M.
        • et al.
        Failure strength of 2.0 locking versus 2.0 conventional Synthes mandibular plates: a laboratory model.
        J Oral Maxillofac Surg. 2006; 64: 1475-1479
        • Sauerbier S.
        • Kuenz J.
        • Hauptmann S.
        • et al.
        Clinical aspects of a 2.0-mm locking plate system for mandibular fracture surgery.
        J Craniomaxillofac Surg. 2010; 38: 501-504
        • Zix J.
        • Lieger O.
        • Iizuka T.
        Use of straight and curved 3-dimensional titanium miniplates for fracture fixation at the mandibular angle.
        J Oral Maxillofac Surg. 2007; 65: 1758-1763
        • Olate S.
        • de Assis A.F.
        • Pozzer L.
        • et al.
        Pattern and treatment of mandible body fracture.
        Int J Burns Trauma. 2013; 3: 164-168