Comparison of Manufacturer‐Recommended Exposure Durations with Those Determined Using Biaxial Flexure Strength and Scraped Composite Thickness Among a Variety of Light‐Curing Units

Abstract

Statement of the

Effects of aging and irradiation time on the properties of a highly translucent resin-based composite

“…However, results obtained for macro-and micro-mechanical properties and rate of cure (Tables 1-3) showed that irradiation for 20 s or more led to significantly better performance. The results of this study agreed with those of Rueggeberg et al 21) , in that the use of manufacturer-recommended irradiation times produced lower flexural strength and scraped composite thickness than did prolonged irradiation times.…”

“…For example, Filtek Supreme XT Translucent showed a higher rate of cure than the Dentin and Enamel shades 17) . Other factors that affect the rate of cure of RBCs include the type of light curing unit used (with different light intensity outputs and spectral distributions [18][19][20][21] ), irradiation time 21) , and distance from the curing light tip 19) . Generally, translucent shades of direct esthetic composites were less examined for their mechanical properties than for their optical properties.…”

Five second photoactivation? A microhardness and marginal adaptation in vitro study in composite resin restorations

“…The exposure time (5 seconds) required for resin polymerization in the PLS – 5 second group is desirable under clinical conditions as it is more comfortable for both patients and clinicians. Although Rueggeberg et al . found inferior properties in restorations when they used 5 seconds to photoactivate the resin (as recommended by the manufacturer), significantly different hardness values were not observed in the present study with the use of continuous light.…”

“…However, the disadvantage inherent in fast polymerization reactions is also associated with this technology because the stress generated during the reaction may increase. Although El‐Shamy and El‐Mowafy obtained higher values for hardness using a high‐intensity photoactivator [compared with other light‐emitting diode (LED) photoactivators], other studies have shown that 5 seconds, as indicated by the manufacturer, is not sufficient for a composite resin to undergo appropriate polymerization.…”

Kekerasan mikro resin komposit packable dan bulkfill dengan kedalaman kavitas berbeda

“…Transmisi sinar yang terjadi pada resin komposit menunjukkan bahwa pada kedalaman 1 mm dari permukaan yang dekat dengan sumber sinar, transmisi sinar hanya 25%, diikuti 12% pada kedalaman 2 mm, dan 7% dengan kedalaman 3 mm. 27 Jadi semakin dalam suatu kavitas maka kekerasannya akan semakin rendah. Pada kekerasan yang rendah atau pada polimersiasi resin komposit yang tidak sempurna, maka terlihat bahwa resin komposit masih dalam fase gel, sehingga resin matriks lunak dan mudah untuk digores.…”