|
The aim of the present study by two different binders pre-infiltration of three different fibers made of rod-like Solidex polymerization porcelain, with a three-point bending method for determination of fiber-reinforced rod resin strip bending strength and determination by moire interferometry its elastic modulus, the enhanced effect compare different fiber reinforced groups, as well as between the different binder pre-invasion group, oral non-metal restorative materials to provide a theoretical basis; moire interferometry applied to the technical field of oral, oral material Determination of mechanical properties to provide a new method. Methods three different fiber aramid fiber Kevlar-49, S-glass and ultra strong polyethylene UHMWPE fiber of high-strength glass fiber, with acetone water, silane coupling agent, and chromic acid solution of these three fiber pretreatment, each fiber with a silicon-containing filler FL-Bond binder and filler-free Dura-Fill binder pre-invasion, divided into 7 groups according to the different fibers and binder and a control group without any fiber , each made of 13 samples. Custom length × width × height 25mm x 2mm x 2mm stainless steel mold, the fiber is laid on the bottom of the mold cavity into the polymerization porcelain light curing system grow × width × thickness 25 mm × 2mm × 2mm of rectangular resin rod, The fibers of the group have taken the same volume, accounting for about 2% of the entire specimen volume. All test items are placed after production is complete save for 24h in 37 ° C distilled water to remove the dry, near the midpoint at each surface of the specimen to measure and record the length, width, thickness (in units of mm, the results take three measurements average). Bending strength (MPa) with a three-point bending test specimen was measured on a universal dynamometer, the dynamometer of loading speed 1mm/min; Determination transfer raster moire elastic modulus (GPa) of the test piece is, the grating frequency 150 lines / mm. Chi-square test (alpha = 0.05), compare types of fibers and binder polymerization porcelain performance measured using SPSS statistical software. Results Compared with the control group did not add any fiber, aramid fiber Kevlar-49, high-strength glass fiber S-Glass and super polyethylene UHMWPE fibers significantly improve the bending strength of the the test Solidex polymerization porcelain (P lt; 0.0001 ) and elastic modulus, GD, GF, PD, PF, AD, AF group flexural strength of 193.7 ± 11.4,174.3 ± 32.1,116.9 ± 21.0,134.2 ± 16.0 220.1 ± 17.9 203.2 ± 25.9 MPa, the elastic modulus were 11.48,8.45,6.24,6.66,8.36,8.36 GPa. With a binder pre-infiltrating the fiber bending strength enhancement effect as Kevlar-49 gt; S-Glass gt; the UHMWPE, elastic modulus is S-Glass Gt; Kevlar-49 gt; UHMWPE; For the same
|