Mechanical properties of collagen membranes used in guided bone regeneration: A comparative study of three models

Objectives. The peroperative rupture of a collagen membrane is a potential cause of complications and loss of effectiveness. The purpose of our study was to determine experimentally the mechanical properties (Young modulus, stress-strain curve, tensile strength) of three collagen membranes used in guided bone regeneration. These properties and isotropy were compared on dry and damp samples. Methods. Standardized samples were tailored in three different membranes (Biomend Extend (R) [Zimmer Dental (TM)], Bio-Gide (R) [Geitslich (TM)] Neonem (R) [TBR (TM)]) in two orthogonal orientations. They were then anchored on an ElectroForce (R) 3230 Instrument (Bose (TM)) traction machine in a dry and wet state (soaking during 10 minutes in saline at 37 degrees C). The strain curves were analyzed to obtain the various mechanical values. Results. No anisotropy was observed. The Biomend Extend (TM) membranes were significantly more resistant in dry and damp states than others. Discussion. The mechanical properties of collagen membranes are very different from one to another. Moistening of the membranes, unavoidable in vivo, considerably alters their mechanical properties. This data should be taken into consideration when choosing a membrane. (C) 2010 Elsevier Masson SAS. All rights reserved.