2015
DOI: 10.1016/j.jdent.2014.12.004
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Post-irradiation hardness development, chemical softening, and thermal stability of bulk-fill and conventional resin-composites

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Cited by 104 publications
(102 citation statements)
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References 41 publications
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“…Organic solvents, as Ethanol and MEK, showed more detrimental effect on the mechanical properties compared to water storage. Several studies have demonstrated more complete extraction of monomers and oligomers with the organic solvents that could explain their stronger impact on the mechanical properties [8,12,45,[47][48][49][50].…”
Section: Discussionmentioning
confidence: 99%
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“…Organic solvents, as Ethanol and MEK, showed more detrimental effect on the mechanical properties compared to water storage. Several studies have demonstrated more complete extraction of monomers and oligomers with the organic solvents that could explain their stronger impact on the mechanical properties [8,12,45,[47][48][49][50].…”
Section: Discussionmentioning
confidence: 99%
“…This increase can be related to the post-irradiation polymerisation caused by the remaining free-radicals in the resin matrix. Postirradiation polymerisation is supported by the fact that the maximum degree of polymerisation needs a long period of time to be reached [27,28,50].…”
Section: Discussionmentioning
confidence: 99%
“…Many parameters may affect the degree of polymerization of bulk fill RBCs such as their composition (photoinitiators, fillers and organic matrix) 6 , the technical characteristics of the light-curing unit (light intensity, thermal emission, wave length range, diameter of the tip) and the conditions of photo-polymerization (curing mode and exposure time) 22 , the post-irradiation period 21 , the temperature 23,24 and the incremental thickness of the material 25 . As statistical analysis revealed the existence of significant differences among the tested bulk fill RBCs with regard to microhardness, the formulated Ho1, which states that there were no differences in microhardness among the RBC materials of the same measurement depth, had to be rejected.…”
Section: Discussionmentioning
confidence: 99%
“…The extent of post-irradiation polymerization may be influenced by various intrinsic factors such as monomer composition, availability of free radicals and initial degree of conversion. However, it is not fully understood how these factors affect this phenomenon 21 . Therefore, the aim of this in vitro study was to evaluate the polymerization efficiency of four highly viscous and four flowable bulk fill resin composites at three depths (0, 2 and 4 mm) from the surface and to determine if they achieve the curing efficiency requirement for microhardness of ≥80%VHN of the top surface (0 mm).…”
mentioning
confidence: 99%
“…Apesar de controverso 81 , vários trabalhos têm mostrado correlação entre grau de conversão e dureza 59,63,67,79 . Tal relação pode ser explicada devido ao fato de que a resistência do material não é determinada somente pela fração inorgânica 4,57,82 , mas também pela criação de uma rede polimérica densa e reticulada 81 . Dessa forma, dureza pode ser considerada um bom indicador indireto de conversão em resinas compostas 63 .…”
Section: Dureza (Khn)unclassified