Description:
<jats:sec><jats:title>Background</jats:title><jats:p>There is a lack of data on polymerization of resin‐based materials (<jats:styled-content style="fixed-case">RBM</jats:styled-content>s) used in paediatric dentistry, using dual‐peak light‐emitting diode (<jats:styled-content style="fixed-case">LED</jats:styled-content>) light‐curing units (<jats:styled-content style="fixed-case">LCU</jats:styled-content>s).</jats:p></jats:sec><jats:sec><jats:title>Objective</jats:title><jats:p>To evaluate the degree of conversion (<jats:styled-content style="fixed-case">DC</jats:styled-content>) of <jats:styled-content style="fixed-case">RBM</jats:styled-content>s cured with dual‐peak or single‐peak <jats:styled-content style="fixed-case">LED LCU</jats:styled-content>s.</jats:p></jats:sec><jats:sec><jats:title>Methods</jats:title><jats:p>Samples of Vit‐l‐escence (Ultradent) and Herculite <jats:styled-content style="fixed-case">XRV</jats:styled-content> Ultra (Kerr) and fissure sealants Delton Clear and Delton Opaque (Dentsply) were prepared (<jats:italic>n</jats:italic> = 3 per group) and cured with either one of two dual‐peak <jats:styled-content style="fixed-case">LCU</jats:styled-content>s (bluephase<jats:sup>®</jats:sup> G2; Ivoclar Vivadent or Valo; Ultradent) or a single‐peak (bluephase<jats:sup>®</jats:sup>; Ivoclar Vivadent). High‐performance liquid chromatography and nuclear magnetic resonance spectroscopy were used to confirm the presence or absence of initiators other than camphorquinone. The <jats:styled-content style="fixed-case">DC</jats:styled-content> was determined using micro‐Raman spectroscopy. Data were analysed using general linear model <jats:sc>anova</jats:sc>;<jats:italic> α </jats:italic>= 0.05.</jats:p></jats:sec><jats:sec><jats:title>Results</jats:title><jats:p>With Herculite <jats:styled-content style="fixed-case">XRV</jats:styled-content> Ultra, the single‐peak <jats:styled-content style="fixed-case">LCU</jats:styled-content> gave higher <jats:styled-content style="fixed-case">DC</jats:styled-content> values than either of the two dual‐peak <jats:styled-content style="fixed-case">LCU</jats:styled-content>s (<jats:italic>P</jats:italic> < 0.05). Both fissure sealants showed higher <jats:styled-content style="fixed-case">DC</jats:styled-content> compared with the two <jats:styled-content style="fixed-case">RBM</jats:styled-content>s (<jats:italic>P</jats:italic> < 0.05); the <jats:styled-content style="fixed-case">DC</jats:styled-content> at the bottom of the clear sealant was greater than the opaque sealant, (<jats:italic>P</jats:italic> < 0.05). 2,4,6‐trimethylbenzoyldiphenylphosphine oxide (Lucirin<jats:sup>®</jats:sup> <jats:styled-content style="fixed-case">TPO</jats:styled-content>) was found only in Vit‐l‐escence.</jats:p></jats:sec><jats:sec><jats:title>Conclusions</jats:title><jats:p>Dual‐peak <jats:styled-content style="fixed-case">LED LCU</jats:styled-content>s may not be best suited for curing non‐Lucirin<jats:sup>®</jats:sup> TPO‐containing materials. A clear sealant showed a better cure throughout the material and may be more appropriate than opaque versions in deep fissures.</jats:p></jats:sec>