The effect of graded glass–zirconia structure on the bond between core and veneer in layered zirconia restorations

Liu, Ruo-Yu; Sun, Ting; Zhang, Yanli; Zhang, Yaokun; Jiang, Danyu; Shao, Longquan

doi:10.1016/j.jmbbm.2015.02.017

Cited by 22 publications

(18 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, layered zirconia restorations tend to fail; chipping and delamination of the veneering ceramic have been reported as the most frequent reason for the failure of zirconia-based restorations [ 2 , 3 ]. Chipping and delamination of the veneering ceramic were reported to result from mismatches of the thermal expansion coefficient and elastic modulus between the zirconia cores and veneering ceramics [ 4 ]. Consequently, in our previous study, we introduced a new concept for the improvement of core-veneer bonding by infiltrating a low modulus nano-sized glass with a matching thermal expansion coefficient into the zirconia surface sintered from nano-zirconia particles, thus producing elastic graded nano-glass/zirconia (G/Z) systems.…”

Section: Introductionmentioning

confidence: 99%

“…Consequently, in our previous study, we introduced a new concept for the improvement of core-veneer bonding by infiltrating a low modulus nano-sized glass with a matching thermal expansion coefficient into the zirconia surface sintered from nano-zirconia particles, thus producing elastic graded nano-glass/zirconia (G/Z) systems. The bond strengths of the G/Z systems to veneering porcelains were demonstrated to be threefold higher than those of conventional zirconia-based systems [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The Biocompatibility of Dental Graded Nano-Glass-Zirconia Material After Aging

Sun

Liu

et al. 2018

Nanoscale Res Lett

Self Cite

View full text Add to dashboard Cite

ᅟA graded nano-glass/zirconia (G/Z) system has been developed via the infiltration of nano-glass into a nano-zirconia surface, which is advantageous for robust core-veneer bonds. The aging issue is a key for yttrium-stabilized tetragonal zirconia polycrystals (Y-TZPs), and therefore, it is necessary to evaluate the influence of aging degradation on the biocompatibility of G/Z systems before their possible clinical application. Herein, such biocompatibility testing was performed with human gingival fibroblasts (HGFs) seeded onto unaged/aged G/Z and Y-TZP for 2–72 h. Assessments included an oral mucous membrane irritation test in conjunction with analyses of cell viability, cell adhesion, and oxidative stress responses. Significant metabolic decreases in aged G/Z- and Y-TZP-treated cells were observed at 72 h. G/Z did not elicit any significant differences in cell viability compared with Y-TZP over 72 h both before and after aging. The oxidative stress data for the aged G/Z- and Y-TZP-treated cells showed a significant increase at 72 h. The G/Z specimens did not elicit any significant differences in ROS production compared with Y-TZP over 72 h both before and after aging. The cell adhesion rates of both G/Z and Y-TZP increased significantly after aging. The cell adhesion rates of G/Z and Y-TZP were not significantly different before and after aging. According to the oral mucous membrane irritation test, scores for macroscopic and microscopic observations for both the aged G/Z and unaged G/Z sides were 0, demonstrating no consequent irritation.ConclusionsThe excellent biocompatibility of G/Z indicates that it has potential for future clinical applications.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Biocompatibility of Dental Graded Nano-Glass-Zirconia Material After Aging

Sun

Liu

et al. 2018

Nanoscale Res Lett

Self Cite

View full text Add to dashboard Cite

show abstract

“…This has been attributed to materials’ thermal and mechanical mismatch and occurrences goes from laboratorial fabrication to in-mouth incidents. Recently developed graded structures have been proposed to address thermal and mechanical coupling in dental restorations with significant improvements in load-bearing capacity, adhesion, wear resistance and aesthetics [23,24,27,36,37]. However, to the authors’ best knowledge, no studies are available on the residual thermal stresses in graded dental ceramic systems.…”

Section: Discussionmentioning

confidence: 99%

Thermal residual stresses in bilayered, trilayered and graded dental ceramics

Fabris

Souza

Silva

et al. 2017

Ceramics International

View full text Add to dashboard Cite

Layered ceramic systems are usually hit by residual thermal stresses created during cooling from high processing temperature. The purpose of this study was to determine the thermal residual stresses at different ceramic multi-layered systems and evaluate their influence on the bending stress distribution. Finite elements method was used to evaluate the residual stresses in zirconia-porcelain and alumina-porcelain multi-layered discs and to simulate the ‘piston-on-ring’ test. Temperature-dependent material properties were used. Three different multi-layered designs were simulated: a conventional bilayered design; a trilayered design, with an intermediate composite layer with constant composition; and a graded design, with an intermediate layer with gradation of properties. Parameters such as the interlayer thickness and composition profiles were varied in the study. Alumina-porcelain discs present smaller residual stress than the zirconia-porcelain discs, regardless of the type of design. The homogeneous interlayer can yield a reduction of ~40% in thermal stress relative to bilayered systems. Thinner interlayers favoured the formation of lower thermal stresses. The graded discs showed the lowest thermal stresses for a gradation profile given by power law function with p=2. The bending stresses were significantly affected by the thermal stresses in the discs. The risk of failure for all-ceramic dental restorative systems can be significantly reduced by using trilayered systems (homogenous or graded interlayer) with the proper design.

show abstract

“…Recently developed graded structures have been proposed to address thermal and mechanical coupling in dental restorations with significant improvements in load-bearing capacity, adhesion, wear resistance and aesthetics. [31–33,37]. However, to the authors' best knowledge, no studies have explored the residual thermal stresses in graded ceramic restorations.…”

Section: Discussionmentioning

confidence: 99%

Influence of interlayer design on residual thermal stresses in trilayered and graded all-ceramic restorations

Henriques

Fabris

Souza

et al. 2017

Materials Science and Engineering: C

View full text Add to dashboard Cite

Residual thermal stresses are formed in dental restorations during cooling from high temperature processing. The aim of this study was to evaluate the influence of constructive design variables (composition and interlayer thickness) on residual stresses in alumina- and zirconia-graded restorations. Restorations' real-like cooling conditions were simulated using finite elements method and temperature-dependent material properties were used. Three different designs were evaluated: a bilayered restoration (sharp transition between materials); a trilayered restoration with a homogenous interlayer between core and veneer; and a trilayered restoration with a graded interlayer. The interlayer thickness and composition were varied. Zirconia restorations presented overall higher thermal stress values than alumina ones. Thermal stresses were significantly reduced by the presence of a homogeneous interlayer. The composition of the interlayer showed great influence on the thermal stresses, with the best results for homogeneous interlayers being observed for porcelain contents in the composite ranging between 30%-50% (vol.%), for both alumina and zirconia restorations. The interlayer's thickness showed a minor contribution in the thermal stress reduction. The graded interlayer showed an optimized reduction in restorations' thermal stresses. The use of graded interlayer, favoring enhanced thermal stress distributions and lower magnitude is expected to reduce the risk of catastrophic failure.

show abstract

The effect of graded glass–zirconia structure on the bond between core and veneer in layered zirconia restorations

Cited by 22 publications

References 29 publications

The Biocompatibility of Dental Graded Nano-Glass-Zirconia Material After Aging

The Biocompatibility of Dental Graded Nano-Glass-Zirconia Material After Aging

Thermal residual stresses in bilayered, trilayered and graded dental ceramics

Influence of interlayer design on residual thermal stresses in trilayered and graded all-ceramic restorations

Contact Info

Product

Resources

About