Український стоматологічний альманах (Mar 2018)
COMPARATIVE ANALYSIS AND EVALUATION OF PHYSICAL AND MECHANICAL PROPERTIES OF A-SILICONE FLEXIBLE CONSTRUCTION MATERIALS
Abstract
The aim of the study was to investigate the physical and mechanical properties of A-silicone materials «PM-S», «PM-S Extra» and «UfI Gel P» (Voco) in a comparative perspective. Bond strength of the material meets the requirements (Н ≥4,0 kg/cm2). That parameter was investigated on acrylic basis and ranged (6,9 ± 0,2) kg/cm2. We determined that bond strength of material «PM-S Extra», which was (6,9 ± 0,2) kg/cm2 was somewhat smaller than that of the material «Ufi Gel P»- (9,2 ± 0.2) kg/cm2 and significantly (p <0.01) higher than that of the material «PM-S» - (5,3 ± 0,2) kg/cm2. Elongation of experimental samples (FP), which indirectly characterizes the elasticity of dental pads for claspless fixation, made of tested materials was in the range (32,3 ÷ 41,7)%. The property of recovery compressive deformation (IB%) of all studied materials ranges (99,90 ÷ 99,95)%, which corresponds to the regulatory requirements (IVS ≥ 96,5%); The consistency compound index (D, mm) of studied A-silicone materials ranges 23,2 ÷ 32,5%, and compliance ≥ 23 mm. We found out that the indicator of compound consistency of material «PM-S Extra», which was (23,9 ± 0,3) mm, greater than the material «PM-S» - (23,2 ± 0,1)% and significantly (p <0 05) smaller than that of the material «Ufi Gel P» - (32,5 + 1,4)%. The index of relative compression set (S, %) of the materials for the manufacture of lining dentures ranges (34,1 ÷ 40,9)%, and compliance (20,0≥S)%; Compressive deformation of the material «PM-S Extra» - (34,1 ± 1,2)% was the lowest value: slightly lower (p <0.05) than that of the material «Ufi Gel P» - (38,3 ± 0,8%) and lower (p <0.05) than that of the material "PM-S" which was (40,9 ± 1.7)%. The findings suggest that, in general, domestic material "PM-S Extra" its physical and mechanical properties fully meets the requirements of this class of dental materials. «PM-S Extra» is characterized by a satisfactory level of reproducibility of standard features that have more stable properties in a clinical setting. Comparative characteristics showed that the material "PM-S Extra" in its main indicators is not inferior to imported materials «Ufi Gel P». It differs from the prototype "PM-S" and has more solid and hard consistency, which makes it possible to fix the removable partial dentures without clasp.
