Prospective <scp>5‐year</scp> clinical evaluation of posterior zirconia fixed dental prostheses veneered with milled lithium disilicate (<scp>CADon</scp>)

Blatz, Markus B.; Hariton-Gross, Karina; Anadioti, Evanthia; Mante, Francis K.; Saleh, Najeed

doi:10.1111/jerd.12877

Cited by 4 publications

(1 citation statement)

References 52 publications

(187 reference statements)

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“…A crack running along the interface between the veneer and the substructure causes partial delamination of the ceramic layer in the region where the mechanical bond is weakest. Delamination is mostly associated with thinner ceramics, while chipping is associated with thicker layers [7,8]. The formation of microbubbles during the layering process and the lower flexural strength (FS) of veneer ceramic are among the factors that cause these failures [5].…”

Section: Introductionmentioning

confidence: 99%

Four‐point flexural strength and microtensile bond strength of digitally and conventionally veneered zirconia

Utar

Demirtag

2023

European J Oral Sciences

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This study intended to evaluate the effect of digital veneering on four-point flexural strength (FS) and microtensile bond strength (μTBS) of veneered zirconia. Two different zirconia blocks, a lithium disilicate and a feldspathic ceramic block, and two different layering ceramics were used. IPS e.max Zir CAD (ZC) and Vita In-Ceram YZ (YZ) with yttria stabilized tetragonal zirconia polycrystals (3Y-TZP) were used as substructures. IPS e.max CAD (LD), Vita Mark II (VMII), IPS e.max Ceram (EC) and Vita VM9 (VM9) were used for veneering. Resin cement and fusion ceramic were placed between veneer and zirconia substructure for digital veneering. A total of one hundred and fifty specimens in five groups (n = 30) were prepared for FS and tested in universal machine at 1.0 mm/min. One hundred specimens in five groups (n = 20) were obtained for the μTBS and tested at 1.0 mm/min. Statistical analysis was made by one way ANOVA and Tukey HSD. Conventional veneering showed statistically significant FS. ZC veneered with EC had the highest mean FS and the lowest was obtained in groups veneered through resin cement. YZ layered with VM9 had the highest mean μTBS. ZC veneered through fusion ceramic and YZ veneered through resin cement showed significantly lower and similar μTBS.

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Section: Introductionmentioning

confidence: 99%

Four‐point flexural strength and microtensile bond strength of digitally and conventionally veneered zirconia

Utar

Demirtag

2023

European J Oral Sciences

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Edge Chipping Resistance and Flexural Strength of CAD‐CAM Ceramics Before and After Thermomechanical Aging

Song,

Ko,

Huh

et al. 2024

J Esthet Restor Dent

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ObjectivesTo evaluate the complementary mechanical properties of dental ceramics using edge chipping resistance (Rea) and flexural strength before and after thermomechanical aging.Material and MethodsComputer‐aided design and computer‐aided manufacturing of ceramic materials, including zirconia (ZR), lithium disilicate (LS2), and resin nanoceramics (RNC), were evaluated. Specimens for flexural strength testing were fabricated with dimensions of 3 × 4 × 25 mm, with 30 specimens per group. For the edge chipping test (ECT), specimens were fabricated with dimensions of 3 × 4 × 12 mm, with 48 specimens per group. Half of the specimens for both tests were subjected to thermomechanical aging for 200,000 cycles at 50 N. A Weibull analysis was performed to determine flexural strength. Fractographic analysis was performed before and after thermomechanical aging during the ECT. X‐ray diffractometry (XRD) was performed on the ZR specimens before and after thermomechanical aging. Flexural strength was analyzed using a two‐way repeated analysis of variance (ANOVA) with a t‐test, and Rea was analyzed using Pearson correlation and a two‐way repeated ANOVA.ResultsThe flexural strength and Rea differed according to the material (p = 0.001), whereas they were similar before and after thermomechanical aging (p > 0.05). The Weibull modulus of the flexural strength decreased after thermomechanical aging. In the fractographic analysis of the ECT, more than two fracture origins were identified after thermomechanical aging. The XRD analysis of ZR showed an increased monoclinic phase after thermomechanical aging.ConclusionAll the materials met the ISO 6872 standards for bending test. However, LS2 and RNC show low edge chipping resistance within the range of the occlusal force. The thermomechanical aging did not significantly alter the mechanical properties of the materials. However, the Weibull coefficients of the flexural strength decreased, and an additional origin of fracture appeared after thermomechanical aging.SignificanceFlexural strength and Rea differed depending on the material used. The probability of the material fracture increased after thermomechanical aging. To understand ceramic fractures, two mechanical tests and thermomechanical aging must be performed together.

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Fatigue resistance of monolithic and multilayer zirconia crowns using veneer layering or CAD-on technique

Tomm,

Machado,

Rosa

et al. 2023

Braz. Dent. J.

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This study aims to evaluate the fatigue resistance of monolithic zirconia (Yz) and multilayer ceramic structures using the CAD-on technique in different thicknesses. Fifty (N=50) standardized single crowns preparations were made in fiberglass-reinforced epoxy resin (NEMA grade G10), digitalized, and restorations were machined in CAD-CAM, composing 5 groups (n= 10): Control: 1.5 mm (milled zirconia framework + manual layered porcelain); Yz monolithic 1.5 mm; Yz monolithic 1.0 mm; CAD-on 1.5 mm; and CAD-on 1.0 mm (milled zirconia framework 0.5 mm thickness bonded by a low fuse ceramic to a milled lithium disilicate layer of 1.0 mm or 0.5 mm, respectively). The G10 bases were conditioned with 10% hydrofluoric acid; the crowns were air abraded with 110 μm alumina particles; and then luted onto each other with self-adhesive resin cement. A cyclic fatigue test was performed (initial load: 400N for 10,000 cycles, frequency of 20 Hz, step size of 200N) until failure, and the data was submitted to a survival statistical analysis. No failures were observed at Yz monolithic 1.5 mm. High and similar performance was observed for Cad-On groups and Yz monolithic 1.0 mm. The control group depicted the worst behavior. The Weibull modulus of CAD-on 1.5 mm was higher than the control while being similar to the other conditions. Both the monolithic systems and the CAD-on technique showed high and similar fatigue fracture behavior and survival rates, which were also higher than the control bilayer system. Both systems reduced the occurrence of delamination failures, making them suitable for clinical use.

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Prospective 5‐year clinical evaluation of posterior zirconia fixed dental prostheses veneered with milled lithium disilicate (CADon)

Cited by 4 publications

References 52 publications

Four‐point flexural strength and microtensile bond strength of digitally and conventionally veneered zirconia

Four‐point flexural strength and microtensile bond strength of digitally and conventionally veneered zirconia

Edge Chipping Resistance and Flexural Strength of CAD‐CAM Ceramics Before and After Thermomechanical Aging

Fatigue resistance of monolithic and multilayer zirconia crowns using veneer layering or CAD-on technique

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