Dynamic mechanical properties of oral mucosa: comparison with polymeric soft denture liners.

Marie-Hélène Lacoste-Ferré (1) , Philippe Demont (1) , Jany Dandurand (1) , Eric Dantras (1) , Damien Duran , Colette Lacabanne (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

The purpose of this work was to characterize the viscoelastic behaviour of oral mucosa and compare it with the dynamic mechanical properties of different soft liners. For this purpose, a sample of pig oral mucosa and six commercialized soft liner samples have been investigated. A comparison was also carried with the first suitable hard rubber for dental prosthetics: vulcanite. Creep recovery (CR) and dynamic mechanical analysis (DMA)have been used to determine the mechanical modulus of oral mucosa and soft liners respectively. The Poisson ratio is used to compare mucosa bulk modulus and soft liner shear modulus. The biomechanical concept of conventional complete dentures needs a good adjustment of dynamic mechanical impedance between the base and oral mucosa. The viscoelastic mechanical property of the oral mucosa as a referent biopolymer has been confirmed in vitro. The modulus value, adjusted for old patients in physiological conditions, is in the order of 3 MPa. This study underlines the plasticization effect of absorbed water on the mechanical properties of the underlying tissue. This study allows us to define some characteristics of the most adapted biomaterial according to the clinical exigency. The required biomaterial must display the following properties: compatibility and chemical resistance with biological environment perpetuated mechanical properties during physiological conditions and clinical use, good adjustment of dynamic mechanical impedance with supporting mucosa and easy sample processing.

Mots clés: Creep recovery; Dynamic mechanical analysis; Polyacrylic; Polyisoprene; Polysiloxane; Oral mucosa; Denture soft liner

Domaines: Matériaux; Matériaux

Marie-Hélène Lacoste-Ferré, Philippe Demont, Jany Dandurand, Eric Dantras, Damien Duran, et al.. Dynamic mechanical properties of oral mucosa: comparison with polymeric soft denture liners.. Journal of the mechanical behavior of biomedical materials, 2011, 4 (3), pp.269-274. ⟨10.1016/j.jmbbm.2010.10.005⟩. ⟨hal-03544103⟩