Digital veneering system enhances microtensile bond strength at zirconia coreveneer interface

Kim, Ki-Yeon; Kwon, Taesoo; Kang, Tae-Joo; Yang, Jae‐Ho; Lee, Shin-Jae; Yeo, In‐Sung

doi:10.4012/dmj.2014-168

Cited by 12 publications

(8 citation statements)

References 23 publications

(30 reference statements)

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“…This has been previously confirmed by the high Weibull modulus displayed by both materials . The hand‐layering technique, on the other hand, has been shown to incorporate pores and defects that act as weakening areas and crack initiation sites in the bulk of the material. The further influence of tensile residual stresses, which arise from the mismatch in CTE between the glassy veneer and the zirconia framework , favored the propagation of cracks through the glass, leading to the chippings of veneer observed in this study.…”

Section: Discussionsupporting

confidence: 55%

In vitro lifetime of zirconium dioxide‐based crowns veneered using Rapid Layer Technology

Riedel

Wendler

Belli

et al. 2019

European J Oral Sciences

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Rapid Layer Technology (RLT) uses computer‐aided design/computer‐aided manufacturing (CAD/CAM) to manufacture a veneer layer that is adhesively bonded to the zirconia framework, avoiding firing steps during the fabrication process and thus preventing build‐up of residual stresses. This work studied, using sliding contact fatigue, the in vitro lifetime of restorations produced using RLT compared with restorations produced using conventional veneering techniques. Zirconia copings were veneered with a conventional hand‐layering method (VM9) using a fast (n = 16) or a slow (n = 16) cooling protocol, or with RLT. For the latter, the veneers were CAD/CAM fabricated using a feldspathic reinforced‐glass (Vitablocs Mark II; n = 16) or a polymer‐infiltrated reinforced‐glass network (Enamic; n = 16) and adhesively bonded to the zirconia frameworks. Crowns thus obtained were submitted to sliding contact fatigue against a steatite indenter in a chewing simulator until failure. A Kaplan–Meier survival analysis was conducted. None of the hand‐layered restorations survived after a 2 × 106‐cycle interval, whereas no fractures in the RLT groups were observed. Vitablocs Mark II veneers survived for a longer testing period (3.5 × 106 cycles) than their Enamic counterparts (2.5 × 106 cycles) owing to their superior wear behavior. The RLT represents an efficient method to veneer zirconia frameworks by reducing processing steps and, more importantly, increasing the lifetime of the restorations.

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Section: Discussionsupporting

confidence: 55%

In vitro lifetime of zirconium dioxide‐based crowns veneered using Rapid Layer Technology

Riedel

Wendler

Belli

et al. 2019

European J Oral Sciences

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“…Routine dental laboratory procedures used to fabricate zirconia frameworks such as grinding, sandblasting, and polishing before porcelain veneering may induce the tetragonal to monoclinic transformation. 4, 5, 6, 7, 8, 9 The monoclinic phase is not suitable for veneering because of its lower CTE compared with the porcelain. 1 Furthermore, the tetragonal to monoclinic transformation is accompanied by volumetric expansion, which may result in grain pull-out and weakening of the zirconia/veneer bond (initial failure).…”

Section: Introductionmentioning

confidence: 99%

Effect of liner and porcelain application on zirconia surface structure and composition

Alghazzawi

Janowski

2016

Int J Oral Sci

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The purpose of this study was to determine if there is an effect of liner and porcelain application (layering and pressing techniques) on the surface of yttria-stabilized tetragonal zirconia polycrystals (Y-TZP), which were exposed to permutations of liner, layered porcelain, and pressed porcelain. Scanning electron microscope (SEM)/energy dispersive spectroscope (EDS) was used to identify changes in composition and microstructure after removing liner and porcelain with hydrofluoric acid. Simulated aging was also conducted to determine the effect of liner and porcelain on low-temperature degradation. The control group had a typical equiaxed grain structure, referred to as unaffected. When covered with liner or porcelain, some areas changed in structure and composition and were termed affected. The frequency of affected structure decreased when liner was covered with either layered porcelain or pressed porcelain. There were statistical differences (P<0.05) in the composition between affected and unaffected for zirconium (layered porcelain with liner: affected=60% (0.8%) (m/m), unaffected=69% (4%), layered porcelain without liner: affected=59% (3%), unaffected=65% (3%)) and oxygen (layered porcelain with liner: affected=35% (2%), unaffected=26% (4%), layered porcelain without liner: affected=35% (3%), unaffected=30% (2%)). However, there were statistical differences (P<0.05) in the composition for zirconium and oxygen of the aged layered porcelain without liner only. The liner should not be used before porcelain application, especially when using the layering technique for zirconia restorations. Furthermore, pressing should be considered the technique of choice over layering.

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“…Previous studies comparing the use of fused CAD/CAM‐produced veneers and the layering method reported higher fracture strength values with CAD/CAM‐produced veneers, potentially indicating a stronger bond between zirconia core and veneering ceramic. In addition, Kanat et al and Kim et al reported higher bond strength values with CAD/CAM‐produced veneers compared to those with layering. In this study, fused IPS e.max CAD and Cerec Blocs specimens resulted in statistically similar bond strength values (Vita: 24.23 MPa, Cerec Blocs: 25.35 MPa, IPS e.max CAD: 27.11 MPa) to those with conventional layering.…”

Section: Discussionmentioning

confidence: 99%

In Vitro Evaluation of Bond Strength between Zirconia Core and CAD/CAM‐Produced Veneers

Tanış

Kılıçarslan

Bellaz

2019

Journal of Prosthodontics

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Purpose To evaluate the shear bond strength between various CAD/CAM veneer materials and the zirconia ceramic core. Materials and Methods Ninety square prism zirconia specimens (10 specimens per each group, n = 10) in dimensions of 10 × 5 × 5 mm were prepared. Eighty square prism veneering specimens (40 feldspathic ceramic [Cerec Bloc] and 40 lithium disilicate [IPS e.max CAD]) in dimensions of 3 × 3 × 1 mm were connected to zirconia specimens. Conventional layering was applied to the remaining zirconia specimens as control group (n = 10). CAD/CAM‐produced veneers were connected to the zirconia specimens using fusion porcelain or resin cement. One of following treatments were applied to the cemented specimens: no surface treatment, HF etching of the veneering material, or HF acid etching of the veneer in combination with the application of a glaze layer to the zirconia surface. Following the veneering procedures, a shear bond strength test was performed at a speed of 1 mm/min using a universal testing machine. Univariate ANOVA (α = 0.05) was performed for statistical analyses of the obtained data. Results Statistically significant differences were not found among the materials (F = 0.176, p = 0.656), while statistically significant differences were found amongst the veneering procedures (F = 57.921, p < 0.001). Statistical differences were observed between the groups (F = 13.766, p < 0.001). The highest shear bond strength values were observed in IPS e.max CAD specimens connected to zirconia with low fusion porcelain (27.11 ± 7.7 MPa), and the lowest values were observed in IPS e.max CAD specimens connected to zirconia with resin cement without surface treatment (9.82 ± 2.8 MPa). The application of fusion porcelain with IPS e.max CAD (p = 0.967) and Cerec Blocs (p = 1.00) showed statistically similar results to those with conventional layering. Conclusions The application of fusion porcelain to bond zirconia and digitally produced veneering material can serve as an alternative veneering method to the conventional layering method by accelerating and facilitating clinical and laboratory stages.

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Digital veneering system enhances microtensile bond strength at zirconia coreveneer interface

Cited by 12 publications

References 23 publications

In vitro lifetime of zirconium dioxide‐based crowns veneered using Rapid Layer Technology

In vitro lifetime of zirconium dioxide‐based crowns veneered using Rapid Layer Technology

Effect of liner and porcelain application on zirconia surface structure and composition

In Vitro Evaluation of Bond Strength between Zirconia Core and CAD/CAM‐Produced Veneers

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