Effect of framework design on fracture load after thermal cycling and mechanical loading of implant-supported zirconia-based prostheses

Komine, Futoshi; Kamio, Shingo; Takata, Hitoshi; Yagawa, Shogo; Taguchi, Serina; Taguchi, Kazunori; Hashiguchi, Akiko; Matsumura, Hideo

doi:10.4012/dmj.2017-057

Cited by 4 publications

(4 citation statements)

References 35 publications

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“…Therefore, the differences in the mechanical properties of materials due to thermocycling are often a result of thermal mismatches of different phases [26] or different materials combination such as porcelain and zirconia [27]. Also, water and temperature variations in the feldpspathic ceramic used herein were not sufficient to cause topographical changes or a decrease in strength.…”

Section: Discussionmentioning

confidence: 95%

Effect of thermocycling aging on the flexural strength of feldspathic ceramic

Carvalho

Kimpara

Bresciani

et al. 2018

BDS

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Objective: The aim of the study was to evaluate the effect of aging through different thermocycling protocols on the flexural strength of a feldspathic ceramic. Material and Methods: Fifty ceramic bars, Vitablock Mark II (VITA), with dimensions of 18X4X2mm were prepared. The bars were randomly distributed to the groups (n = 10), which were defined according to the number of thermal cycles (TCy): G0 - no TCy; G500 - 500 cycles of TCy; G6000 - 6000 TCy; G10000 - 10000 TCy; G15000 - 15000 TCy. After aging, the specimens were subjected to the three point bending test in a universal testing machine (EMIC DL 1000), under 0.5mm/min speed and loading of 50kgf, until catastrophic failure. A sample of each group was evaluated for topographic morphology under Scanning Electron Microscopy. Results: For mechanical testing, the following mean values and standard deviation (MPa) were obtained: G0 (99.78 ± 5.07); G500 (101.64 ± 5.59); G6000 (98.13 ± 4.95); G10000 (91.77 ± 9.68); G15000 (101.51 ± 4.22). An analysis of variance by regression equation (p = 0.387) was performed, demonstrating a weak and non-significant correlation between flexural strength and number of thermal cycles. Conclusion: It can be concluded that aging in water solely by different numbers of temperature cycles did not influence on the flexural strength of a feldspathic ceramic. Keywords Material resistance; Aging; Ceramics.

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Section: Discussionmentioning

confidence: 95%

Effect of thermocycling aging on the flexural strength of feldspathic ceramic

Carvalho

Kimpara

Bresciani

et al. 2018

BDS

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“…To overcome this disadvantage of ceramic, layering of composite over zirconia coping was tried, and as literature suggests, the performance in terms of fracture strength of these crowns was at par with that of zirconia ceramic crowns. [ 2 4 5 6 ] The advantage of these crowns was that it had the strength of the zirconia substructure and a resilient layering of composite. It also had the advantage of easy handling and intraoral repair.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of fracture resistance and color stability of crowns obtained by layering composite over zirconia and polyetheretherketone copings before and after thermocycling to simulate oral environment: An in vitro study

et al. 2020

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A BSTRACT Background: Most common material used for the fabrication of an implant restoration is full-ceramic crown or an all-ceramic crown. Frequent chipping of the ceramic under occlusal load has posed a great problem to the clinician and the patient. Composites have been layered over zirconia successfully in the recent past to overcome this problem. This study, thus, aimed to evaluate and compare the fracture resistance and color stability of crowns obtained by layering composite over zirconia and polyetheretherketone (PEEK) copings before and after thermocycling to simulate oral environment. Materials and Methods: A total of 40 crowns (20 per group) were obtained by layering composite of A3 shade over computer-aided design/computer-aided milling milled zirconia and PEEK copings. Thermocycling of the 10 out of the 20 crowns was performed in a thermocycler (5000 cycles, in water temperature of 5°C and 55°C with dwell time of 30s), and then they were kept in hot and cold beverages for 24h each, to simulate oral environmental conditions. After thermocycling, the crowns were divided into four groups of 10 samples each: Group Z, ZT, P, and PT. Shade evaluation of all the crowns was performed using digital shade guide (VITA Easyshade ® Advance; VITA Zahnfabrik, Bad Säckingen, Germany) and VITAPAN classical (VITA Zahnfabrik). Fracture strength was tested for all the crowns in a universal testing machine. Fracture strength in megapascal and the applied occlusal load in kilograms were recorded. Data obtained were statistically evaluated by one-way analysis of variance and post hoc test. Results: The final shade of the crowns obtained by layering A3 shade composite in the groups Z was A3, ZT was B3, P was C3, and PT was D2. The value of mean fracture strength of crowns of groups Z was 1142.3MPa, ZT was 1034.57MPa, P was 2134.64MPa, and PT was 1765.01MPa. Conclusion: Thermocycling affected the shade of all the crowns. The mean fracture strength of the crowns having PEEK copings was significantly higher than that of zirconia copings. Thermocycling did not have a significant effect on the mean fracture strength.

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“…[13][14][15] The main purpose of applying these designs is to mechanically enhance these restorations by resisting chipping and delamination. 16,17 However, the color match of zirconia restorations with regard to their various types and designs is unclear. [18][19][20][21] Dental zirconia ceramics, which are structurally based on yttria-stabilized tetragonal zirconia polycrystals, are optically semitranslucent.…”

mentioning

confidence: 99%

“…The dentin core design incorporates a zirconia framework that resembles the thicknesses of the natural dentin layer and a veneering ceramic that replicates the natural enamel layer 13–15 . The main purpose of applying these designs is to mechanically enhance these restorations by resisting chipping and delamination 16,17 . However, the color match of zirconia restorations with regard to their various types and designs is unclear 18–21 …”

mentioning

confidence: 99%

Color match of ultra‐translucency multilayer zirconia restorations with different designs and backgrounds

Ghoveizi

Baghaei

Tavakolizadeh

et al. 2023

Journal of Prosthodontics

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PurposeThe purpose of this in vitro study was to assess the color match of ultra‐translucency multilayer zirconia restorations with different designs and backgrounds.Materials and methodsThirty ultra‐translucency multilayer zirconia crown specimens were made in VITA classical shade B2 for a prepared maxillary central incisor. The specimens were divided into three groups based on the restoration design: veneered zirconia with a trestle design (VZT), veneered zirconia with a dentin core design (VZD), and full‐contour zirconia (FCZ). In the groups VZT and VZD, the zirconia specimens were layered with a feldspathic veneering ceramic. The specimens were seated on five different backgrounds: shade B2 composite resin, shade B2 zirconia, copper‐colored metal alloy, silver‐colored metal alloy, and the prepared central incisor. CIELab values of the labial middle sections of the crown specimens were measured with a spectrophotometer. Color differences between the specimens and a shade B2 VITA classical tab (as a control) were calculated from the ΔE*ab formula and compared with an acceptability threshold (ΔE*ab = 3.7) to be clinically explicated.ResultsMean ΔE*ab values ranged between 1.17 and 8.48. The restoration design, the background type, and their interaction affected the ΔE*ab (p < 0.001). The mean ΔE*ab values for VZT with all backgrounds and for VZD with the silver‐colored metal background were greater than the threshold (p < 0.001), whereas the mean ΔE*ab values for VZD with the other backgrounds and FCZ with all backgrounds were less than the threshold (p = 1).ConclusionsRestoration design and background type affected the color match of ultra‐translucency multilayer zirconia restorations. VZT restorations on all backgrounds and VZD restorations on a silver‐colored metal background showed color mismatches. However, VZD restorations on the other backgrounds and FCZ restorations on all backgrounds demonstrated color matches.

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Effect of framework design on fracture load after thermal cycling and mechanical loading of implant-supported zirconia-based prostheses

Cited by 4 publications

References 35 publications

Effect of thermocycling aging on the flexural strength of feldspathic ceramic

Effect of thermocycling aging on the flexural strength of feldspathic ceramic

Evaluation of fracture resistance and color stability of crowns obtained by layering composite over zirconia and polyetheretherketone copings before and after thermocycling to simulate oral environment: An in vitro study

Color match of ultra‐translucency multilayer zirconia restorations with different designs and backgrounds

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