TY - JOUR
T1 - Effects of shades of a multilayered zirconia on light transmission, monomer conversion, and bond strength of resin cement
AU - de Araújo Neto, Vitaliano Gomes
AU - Soto-Montero, Jorge
AU - de Castro, Eduardo Fernandes
AU - Feitosa, Victor Pinheiro
AU - Rueggeberg, Frederick Allen
AU - Giannini, Marcelo
N1 - Funding Information:
The authors would like to thank Dr. Elliot W. Kitajima and Renato B. Salaroli (College of Agriculture ?Luiz de Queiroz,? University of S?o Paulo, Piracicaba, SP, Brazil) for assistance with all the microscopy analyses and CAPES (Coordination for the Improvement of Higher-Level Personnel, Finance Code 001) for supporting this study.
Publisher Copyright:
© 2021 Wiley Periodicals LLC.
PY - 2022/3
Y1 - 2022/3
N2 - 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.
AB - 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.
KW - ceramics
KW - dental materials
KW - light curing
KW - operative dentistry
UR - http://www.scopus.com/inward/record.url?scp=85115692066&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85115692066&partnerID=8YFLogxK
U2 - 10.1111/jerd.12821
DO - 10.1111/jerd.12821
M3 - Article
C2 - 34569699
AN - SCOPUS:85115692066
SN - 1496-4155
VL - 34
SP - 412
EP - 422
JO - Journal of Esthetic and Restorative Dentistry
JF - Journal of Esthetic and Restorative Dentistry
IS - 2
ER -