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

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.

Final Colour of Ultratranslucent Multilayered Zirconia Veneers, Effect of Thickness, and Resin Cement Shade

“…Masking properties of different ceramics for veneer restorations depends on the translucency and thickness of material [ 38 , 39 ]. The translucency in UTML zirconia remains a challenge because the presence of crystals and pigments attenuates the light and the composition, and the microstructure of each layer material may influence translucency due to difference between the refractive index of crystals and size of filler particles [ 21 ]. Determining the role of optical characteristics of multilayered zirconia in the aesthetic appearance of ceramic restorations needs more clinical investigations especially for thin laminates.…”

“…After abrasion, ceramic surface was treated by a single bottle MDP-based adhesive primer (Clearfil Ceramic Primer plus; Kuraray Noritake Dental, Tokyo, Japan). To simulate the clinical scenario for cementation, tooth primer was applied to the composite resin substrate surface (Tooth Primer, Kuraray Noritake Dental, Tokyo, Japan) in accordance with manufacturer's instruction [ 21 ]. 45 specimens of each thickness were further divided into 5 groups ( n = 9), and dual cure adhesive resin cement (Panavia V5, Kuraray Noritake, Tokyo, Japan) in five shades of clear, universal, white, brown, and opaque was applied between the treated surface of ceramic specimen and composite resin substrate.…”

Surface roughness and translucency of glazed versus polished cubic ultra-translucent multi-layered zirconia: An in-vitro study

“…More recently the ultra-translucent multilayered zirconia has been introduced to the market. This material is intended to replicate the unique characteristics of teeth according to each anatomical region, keeping translucency at the incisal edge and a higher opacity at the cervical area [4] .…”

Avaliação das propriedades mecânicas, físicas e opticas de resinas provisórias indicadas para uso em impressora 3D

“…On the other hand, despite the statistically significant ΔE00, neither RES nor PRI showed color alterations above the threshold of 4.6 reported for temporary 3D printed resins, and both resins showed negative alterations on b*, meaning that the materials became bluer, which could compensate for any noticeable yellowing of the restoration by producing an enhanced whiteness perception. 52,53 Also, the alterations in a* and b* parameters were smaller than those observed in COS and SMA.…”

“…Regardless the surface treatments (APA or NAA), the adhesive (for REX) or the primer (for PAN) were applied to provisional resins, followed by their respective resin cement. 52 A pair of blocks that received the same surface treatment were used for bonding.…”