Effects of shades of a multilayered zirconia on light transmission, monomer conversion, and bond strength of resin cement

Vitaliano Gomes de Araújo Neto, Jorge Soto-Montero, Eduardo Fernandes de Castro, Victor Pinheiro Feitosa, Frederick Allen Rueggeberg, Marcelo Giannini

Research output: Contribution to journalArticlepeer-review

Abstract

Objective: To evaluate the influence of shades of a multilayered zirconia on light transmission, resin cement degree of conversion, and shear bond strength of resin cement. Materials and methods: The light transmission through opaque (OPQ) and translucent (TNS) regions of Katana UTML zirconia (Kuraray Noritake Dental) were evaluated for using a spectroradiometer (n = 5). Degree of conversion of dual-cure resin cement (Panavia V5, Kuraray Noritake Dental) was measured after light-activation through OPQ or TNS regions and direct exposure. Composition of the zirconia was analyzed with energy dispersive x-ray spectroscopy (EDS). Shear bond strength (SBS) was evaluated on the OPQ and TNS regions after 24 h and 1 year from specimen preparation (n = 15). Results: The OPQ region produced higher irradiance loss (95.1%) than TNS one (92.9%), and lower degree of conversion (52.4%) than TNS (71.2%) at 24 h post-light activation. EDS analysis did not show differences on the microstructure of the OPQ and TNS regions. There were no significant differences on the SBS between zirconia regions. For both zirconia regions, a significant reduction on the SBS occurred after aging, being 31.7% for OPQ and 38% for TNS. Conclusion: Both OPQ and TNS regions affected the light transmission through the multilayered zirconia. The OPQ region yielded the highest light attenuation and the lowest degree of conversion of resin cement. Different regions of the zirconia did not influence the SBS. Clinical significance Although opaque and translucent regions of the multilayered zirconia reduced the light transmission from LED curing unit and the degree of conversion of resin cement, the regions did not affect the resin cement adhesion.

Original languageEnglish (US)
JournalJournal of Esthetic and Restorative Dentistry
DOIs
StateAccepted/In press - 2021

Keywords

  • ceramics
  • dental materials
  • light curing
  • operative dentistry

ASJC Scopus subject areas

  • Dentistry(all)

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