The dynamic viscoelasticity and water absorption characteristics of soft acrylic resin materials containing adipates and a maleate plasticizer

Abstract

The purpose of this study was to investigate the use of different plasticizers in soft acrylic resin materials to reduce leaching of the plasticizer and thus increase the durability of tissue conditioners. Samples were prepared containing different combinations of three types of polymer/copolymer powder and four types of plasticizer liquid (DEHM, DIBA, DAA and DINA). The dynamic viscoelasticity of each sample was measured after water immersion using a dynamic mechanical analyzer. Water absorption, solubility and weight change were also measured. A significant difference was found among the materials regarding dynamic viscoelasticity, water absorption and solubility. The samples containing P-n-BMA had the most stable G' and G'' scores throughout the immersion. P-n-BMA is the most suitable powder together with DEHM as the most suitable liquid component for a tissue conditioner. These results suggest that it is possible to improve the durability of tissue conditioners by combining different polymers and plasticizers.

The effect of crude drugs on the angiogenic property and dynamic viscoelasticity of PEMA-based soft polymer materials

“…The shear storage modulus (G' ) in soft polymer materials measures stored energy, which represents the elastic component of material behavior, whereas shear loss modulus (G'' ) measures the energy dissipated as heat, which represents the viscous component. Loss tangent (tan δ) is a useful parameter and a measure of the ratio of energy dissipated to energy stored 7,17,18) . Lower G' and higher G'' values (high values of tan δ) indicate good flow characteristics in the material, which would allow the damaged denturebearing mucosa to recover to a healthy state and record the shape of the mucosa under functional stress more effectively 17,18) .…”

“…Tissue conditioners are often used in edentulous patients to treat alveolar mucosal lesions such as denture stomatitis and decubitus ulcers due to illfitting dentures; they may also be used for recording dynamic functional impressions, temporary relining during the healing phase after implant placement, and other clinical applications that can utilize their specific viscoelastic properties [3][4][5][6][7] . The clinical use of soft polymer materials as tissue conditioners for the treatment of decubitus ulcers is based on the fact that it relieves the distribution of pressure on the alveolar mucosa by absorbing the bite force due to their specific viscoelastic properties.…”

“…However, rapid loss of viscoelasticity occurs during clinical use due to the leaching of EtOH and plasticizer into the oral environment 18,[20][21][22] . Therefore, most previous studies are related to improving the life span of soft polymer materials [5][6][7]18,23) . To date, the mechanical and surface properties, as well as the dimensional stability of tissue conditioners have been widely investigated [4][5][6][7]17,19,24,25) .…”

“…Therefore, most previous studies are related to improving the life span of soft polymer materials [5][6][7]18,23) . To date, the mechanical and surface properties, as well as the dimensional stability of tissue conditioners have been widely investigated [4][5][6][7]17,19,24,25) . However, the effect of the combination of crude drugs and soft polymer materials (powder form) on the angiogenic and dynamic viscoelastic properties of the material have not been reported so far.…”

Efeito da incorporação de agentes antimicrobianos sobre propriedades físicas de materiais resilientes temporários para base de prótese

“…As propriedades dos materiais resilientes podem ser influenciadas por diversos fatores tais como composição, peso molecular e concentração dos agentes plastificantes, presença e concentração de álcool etílico na composição, proporção pó-líquido e características hidrofílicas dos polímeros (CANAY et al, 1999;SUTOW, 1991;JONES et al, 1988;MURATA et al, 1998;MURATA et al, 1994 (HONG et al, 2008;HONG et al, 2012;MURATA et al, 2001). Para um reembasador temporário à base de resina acrílica, tal como o Trusoft, o tempo médio de vida clínica para que o material possa desempenhar adequadamente suas funções é de 14 dias (BAL; YAVUZYILMAZ; YÜCEL, 2008;CHOW;MATEAR;LAWRENCE, 1999;NIKAWA et al, 1994;SCHNEID, 1992 (MACHADO et al, 2011).…”