Curing-light attenuation in filled-resin restorative materials

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dc.contributor.authorMusanje, L.
dc.contributor.authorDarvell, B.W.
dc.date.accessioned2023-05-25T14:04:10Z
dc.date.available2023-05-25T14:04:10Z
dc.date.issued2006
dc.description.abstractTo characterize the attenuation of the curing light in filled resin restorative materials (FRRMs) to aid understanding of curing depth. One hundred and eighty materials of various shades from several manufacturers were tested in various ways. One set (66 materials) was used to determine the applicability of Lambert's Law using a quartz-tungsten-halogen curing light (Optilux 400, Demetron Research) by measuring the transmitted light with a dental radiometer (Cure Rite, EFOS) for successive thicknesses of ground 10mm diameter specimens from 3 to 0.5mm in 0.5mm steps. A second set (17 materials) were similarly tested with separate specimens from 1 to 5mm in thickness using a transmission densitometer (DT1405, RY Parry) fitted with a curing-light dichroic filter. For a third (overlapping) set (165 materials), the 1mm pure (reflectance-free) optical density (D1 value) was determined from two specimens, ∼1 and ∼2mm thick using the densitometer as above. From D1 the critical thickness (xCRIT), identified as depth of cure (DoC) for an excess surface exposure factor of 2, was calculated. Lambert's Law was found to hold with no evidence of appreciable differential absorption effects. Attenuation coefficient and D1 were significantly correlated (P<1×10−13). D1 varied between about 0.23 and 0.72, for corresponding xCRIT values of 1.3 and 0.4mm. There was no correlation between D1 and reflectance (P>0.09), and no systematic effect due to shade letter, but a highly significant (P<7.5×10−8), but weak (−0.066mm/unit), correlation between shade number and D1.en_US
dc.identifier.citationMusanje, L., & Darvell, B. W. (2006). Curing-light attenuation in filled-resin restorative materials. Dental Materials, 22(9), 804-817.https://doi.org/10.1016/j.dental.2005.11.009en_US
dc.identifier.issn0109-5641
dc.identifier.urihttps://nru.uncst.go.ug/handle/123456789/8803
dc.language.isoenen_US
dc.publisherDental Materialsen_US
dc.subjectLight attenuationen_US
dc.subjectResin composite restorative materialsen_US
dc.subjectIrradianceen_US
dc.titleCuring-light attenuation in filled-resin restorative materialsen_US
dc.typeArticleen_US
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