Using injection systems
for processing denture resins may improve mechanical properties. Objectives: This study evaluate the effect of injection molding
technique on the flexural strength (FS) and modulus (FM) of 6 denture
resin 2 Type 1, Class1 (Lucitone 199, LT; Fricke HI, FH),1 Type 1, class2 (SR
Ivocap, IV), 1 type 5 (Acron MC, AC) and 2 fluid resin type 2, class2
(Palapress Vario, PV; Fricke HI Poure, FP).
Methods: Specimens strip 64x10x3.3 were prepared from each
material. Flexural properties were determined in 3-point bending after storage
in water at 37°C for 50 h using testing machine at a crosshead speed of
5mm/min.
Results: Mean and standared deviation of flexural strength (MPa,
n=6) and flexural modulus (Gpa, n=6) are listed.
AC
LT
FH
IV
PV
FP
FS-CM
84.6 (5.3) 71.7 (1.5) 70.8
(3.3)
na
FS-PO 67.5 (5.0) 58.9
(2.0)
FS-IJ 89.0
(2.8) 71.4 (3.6) 74.5
(2.5) 73.5
(2.1)
FS-IJ 73.4
(5.8) 65.0 (2.4)
FM-CM
2.10 (0.07) 1.72 (0.05) 1.70
(0.06)
na
FM-PO 1.89 (0.10) 1.75
(0.06)
FM-IJ 2.27
(0.07) 1.78 (0.15) 1.96 (0.05)
1.80(0.06) FM-IJ 2.04
(0.08) 1.90 (0.06)
Flexural data were
analyzed by 2-way analysis of variance.Tukey-Kramer intervals at the 0.05
significance level for comparison of flexural strength and modulus among 6 resin
and between 2 processing techniques were 6.1 and 2.1 MPa and 0.12 and 0.04 Gpa.
Injection techniques increased FS for AC, FH, PV, and FP, and increased FM for
AC, LT, FH, PV and FP. Microwave resin AC (both techniques) had the highest
flexural properties of the resin tested. Conclusion: Processing of
denture resins by injection molding techniques improved flexural
properties. |