TY - JOUR
T1 - Degradation of repaired denture base materials in simulated oral fluid
AU - Lin, Che Tong
AU - Lee, Sheng Yang
AU - Tsai, T. Y.
AU - Dong, De Rei
AU - Shih, Yung Hsun
PY - 2000/3
Y1 - 2000/3
N2 - This in vitro study evaluates the degradation of repaired denture bases upon immersion in a simulated oral fluid. Denture base materials (Luciton 199®), after being repaired by Repair Material® and Triad®, using three different joint surface designs (butt, round and 45° bevel), were immersed onto 99.5 vol.% ethanol/water solution (with similar solubility parameter) for various amounts of time (0-72 h). The flexural loads of the six combination of groups were measured by the three-point bending tests using a universal testing machine. Acoustic emission (AE) during sample fracturing were processed using the MISTRA 2001 system. The fracture pattern and surface details of the interface were examined with a scanning electronic microscope (SEM). Data were analysed using three-way ANOVA and Tukey LSD tests. SEM micrographs of the fracture interface were used to differentiate the fracture mode. The flexural loads (2.72 ± 0.51 Kgf) of the round joint specimens were significantly higher (P < 0.05) than those (butt: 1.66 ± 0.38 Kgf, 45° bevel: 1.93 ± 0.41 Kgf) of the other two designs. This corresponds to the microscopic examination in which more cohesive failure mode was found for the round joint group after storage. The flexural loads (2.54 ± 0.39 Kgf) of the specimens repaired with Triad® were significantly higher (P < 0.05) than those (1.59 ± 0.40 Kgf) of specimens repaired with Repair Material®. Significant progressive reduction of the flexural load and/or AE signals of the specimens was noted in proportion to the length of time of the immersion in the simulated oral fluid. Mechanical strength of a denture base repaired with a round joint design and light-cured material is significantly higher after immersion in simulated oral fluid.
AB - This in vitro study evaluates the degradation of repaired denture bases upon immersion in a simulated oral fluid. Denture base materials (Luciton 199®), after being repaired by Repair Material® and Triad®, using three different joint surface designs (butt, round and 45° bevel), were immersed onto 99.5 vol.% ethanol/water solution (with similar solubility parameter) for various amounts of time (0-72 h). The flexural loads of the six combination of groups were measured by the three-point bending tests using a universal testing machine. Acoustic emission (AE) during sample fracturing were processed using the MISTRA 2001 system. The fracture pattern and surface details of the interface were examined with a scanning electronic microscope (SEM). Data were analysed using three-way ANOVA and Tukey LSD tests. SEM micrographs of the fracture interface were used to differentiate the fracture mode. The flexural loads (2.72 ± 0.51 Kgf) of the round joint specimens were significantly higher (P < 0.05) than those (butt: 1.66 ± 0.38 Kgf, 45° bevel: 1.93 ± 0.41 Kgf) of the other two designs. This corresponds to the microscopic examination in which more cohesive failure mode was found for the round joint group after storage. The flexural loads (2.54 ± 0.39 Kgf) of the specimens repaired with Triad® were significantly higher (P < 0.05) than those (1.59 ± 0.40 Kgf) of specimens repaired with Repair Material®. Significant progressive reduction of the flexural load and/or AE signals of the specimens was noted in proportion to the length of time of the immersion in the simulated oral fluid. Mechanical strength of a denture base repaired with a round joint design and light-cured material is significantly higher after immersion in simulated oral fluid.
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U2 - 10.1046/j.1365-2842.2000.00513.x
DO - 10.1046/j.1365-2842.2000.00513.x
M3 - Article
C2 - 10784330
AN - SCOPUS:0034154175
SN - 0305-182X
VL - 27
SP - 190
EP - 198
JO - Journal of Oral Rehabilitation
JF - Journal of Oral Rehabilitation
IS - 3
ER -