Keywords
physical and mechanical properties
removable partial dentures
claspless fixation
How to Cite
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 meet the requirements (Н⩾4,0 kg/cm2). That parameter was investigated on acrylic bases 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 characterize 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 was found 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» their physical and mechanical properties fully meet the requirements of this class of dental materials.
"PM-S Extra" is characterized by a satisfactory level of reproducibility of standard features that it appears 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", differs from the prototype "PM-S" is more solid and hard consistency, which makes it possible to fix the removable partial dentures without clasp.
Keywords: A-silicone material, physical and mechanical properties, removable partial dentures, claspless fixation.
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