Evaluation of crosshead speed influence on shear bond strength test

Abstract

<p><span style="font-size: medium;">The objective of this study was to evaluate the influence of different speeds using the piston device in the shear bond strength. 48 cylinders of composed resin had been confectioned (Solidex),and were divided randomly in four groups (n=12).</span><span style="font-size: medium;"> </span><span style="font-size: medium;">The specimens were adapted to the device for the</span><span style="font-size: medium;"> </span><span style="font-size: medium;">shear bond strenth test and were taken to an universal testing machine with a load cell of 1000Kg. The test were carried through with four different speeds: group A: 0,5; group B: 1,0; group C: 1,5 and group D: 2,0mm/min. The mean and standard deviations, in Kgf, were: A - 66,31(10,24); B - 64,53 (20,40); C - 75,23 (11,84) and D - 66,62 (13,81). The data were submitted to ANOVA (p=0,13). The results indicated that it did not have statistical significant difference between the groups</span><span style="font-size: medium;"> </span><span style="font-size: medium;">A, B, C and D concluding that the speed in this type of test, with this device, can be varied without modify results.</span></p>

Evaluation of Bond Strength of Hydrophilic Pit and Fissure Sealants (In Vitro Study).

“…Aging of the material under laboratory in-vitro condition was fulfilled through thermocycling to simulate the stresses to which teeth and the sealants are subjected to in the oral environment. Thermocycling generates repeated cycles of expansion and contractions at the interface between the enamel and the resin material and this is because of the high expansion contraction coefficient of the resin material (25,30,37). All specimen were directed perpendicularly centralized over enamel surface so as the buccal surface of each tooth was parallel to the mold, as it allows the direction of shearing force to be perpendicular to the bonded specimen, sealants were applied and cured according to the manufacturer's instructions material all specimens were subjected to shear force in universal testing machine so as the shearing rod will be perpendicular to the specimens (27) .…”

Bonding Behavior of Conventional PMMA towards Industrial CAD/CAM PMMA and Artificial Resin Teeth for Complete Denture Manufacturing in a Digital Workflow

“…Therewith, the crosshead speed seems to have an influence on the shear bond strength. Literature reports speed values ranging between 0.5 and 2.0 mm/min [ 28 ]. However, an ISO guideline (TR 11405) recommends applying a crosshead speed between 0.45 and 1.05 mm/min (International Organization for Standardization, ISO TR 11405: Guidance on testing of adhesion in tooth structure, 1994).…”

Bond strength of a resin composite to MTA at various time intervals and with different adhesive strategies

“…Some research shows that the crosshead speed influences the results of the SBS tests, other does not confirm that. 18,19 In the previous research on the changes in the bond strength of composite to MTA, depending on the time of composite placement, it was suggested that changes in the porosity of MTA during its setting may have an impact on the bond strength. Initially, the MTA is more porous so there are more microretentions available for the adhesive system.…”