Fracture resistance of zirconia-composite veneered crowns in comparison with zirconia-porcelain crowns

Alsadon, Omar; David, Patrick; Ag, Johnson; Pollington, Sarah; Wood, Duncan J.

doi:10.4012/dmj.2016-298

Cited by 27 publications

(27 citation statements)

References 52 publications

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“…Samples of the control group of the crowns obtained by layering composite over zirconia copings (Group Z) had a mean fracture strength of 1142.3MPa when a mean load of 116.49kg was applied. The mean fracture strength of zirconia layered with composite was 1465N in a study conducted by Alsadon et al [ 4 ] and 1094 ± 206N as per a study conducted by Atout and Dawood,[ 12 ] which is comparable with the fracture strength values for zirconia-layered composite crowns in this study. Samples of the control group of the crowns obtained by layering composite over PEEK copings (Group P) had the highest mean fracture strength of 2134.64MPa when a mean load of 217.67kg was applied.…”

Section: Discussionsupporting

confidence: 87%

“…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%

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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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Section: Discussionsupporting

confidence: 87%

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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“…Alghazzawi and Janowski[ 24 ] stated that pressing technique is considered technique of choice over layering on yttria-stabilized tetragonal zirconia polycrystals. Alsadon et al [ 25 ] conducted a study to show that zirconia composite crowns showed similar occlusal load bearance as compared to zirconia porcelain crowns.…”

Section: Discussionmentioning

confidence: 99%

A comparative evaluation of the effect of liners on the shear bond strength of veneered zirconia block: An in vitro study

Yadav

Dabas

Phukela

et al. 2019

J Indian Prosthodont Soc

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Aim: This study aims to evaluate the effect of lithium disilicate glass–ceramic liner, silicon dioxide based liner, and glass–ceramic interlayer on the shear bond strength (SBS) of a commercially available veneered zirconia block and to study fractographic behavior of the samples using universal testing machine, scanning electron microscope (SEM). Setting and Design: In vivo – comparative study. Materials and Methods: 60 samples were fabricated from VITA (vita zahnfabrik. Bad sackingen, Germany) zirconia discs. Samples were divided into 4 groups with 15 samples each. First is the control group, second is lithium disilicate glass–ceramic liner group, third is silicon dioxide based liner, and fourth is glass–ceramic interlayer group. SBS of samples was recorded using universal testing machine. Samples were further analyzed for fractographic behavior using SEM. Statistical Analysis Used: One Way ANOVA test, and Chi-Square test. Results: The intergroup comparison of mean SBS (Mpa) was done using the post hoc Bonferroni test. The mean SBS (Mpa) was significantly more among lithium disilicate and glass–ceramic interlayer groups in comparison to silicon dioxide-based liner group. Fractographic analysis was done using the Chi-square test. Conclusion: It was concluded that maximum SBS was obtained for lithium disilicate liner. Maximum adhesive failures were found with lithium disilicate liner, and silicon dioxide-based liner group showed cohesive failures.

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“…Posterior fixed restorations ought to have the capability to tolerate a 500 N occlusal load 22,23 . Accordingly a load of 500 N was applied by a ball model of diameter 5.8 mm equal to that of metallic rod ball of the universal testing machine used for fracture resistance test in this study.…”

Section: Finite Element Analysismentioning

confidence: 99%

Fracture resistance and 3D finite element analysis of machined ceramic crowns bonded to endodontically treated molars with two planes versus flat occlusal preparation designs: an in vitro study

2021

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Background: The flat occlusal preparation design (FOD) of posterior teeth offers promising results of fracture resistance and stress distribution, but its application in vital teeth is limited as there may be a danger of pulp injury. Although this danger is omitted in endodontically treated teeth, there is no research work assessing the impact of FOD on the fracture resistance and distribution of stresses among these teeth. The aim of this study was to assess the impact of FOD of endodontically treated molars on the fracture resistance and distribution of stresses among a ceramic crown-molar structure when compared to the two planes occlusal preparation design (TOD). Methods: 20 human mandibular molars were endodontically treated and distributed equally to two groups: Group I (TOD) and Group II (FOD). Ceramic CAD/CAM milled lithium disilicate (IPS e.max CAD) crowns were produced for all preparations and adhered using self-adhesive resin cement. Using a universal testing machine, the fracture resistance test was performed. The fractured samples were examined using a stereomicroscope and scanning electron microscope to determine modes of failure. Stress distribution was evaluated by 3D finite element analysis, which was performed on digital models of endodontically treated mandibular molars (one model for each design). Results: Group II recorded statistically non-significant higher fracture resistance mean values (3107.2± 604.9 N) than Group I mean values (2962.6 ±524.27 N) as indicated by Student’s t-test (t=0.55, p= 0.57). Also, Group II resulted in more favorable failure mode as compared to Group I. Both preparation designs yielded low von-Mises stresses within the factor of safety. However, the stress distribution among different layers of the model differed. Conclusions: FOD having comparable fracture strength to TOD and a more favorable fracture behavior can be used for the preparation of endodontically treated molars.

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Fracture resistance of zirconia-composite veneered crowns in comparison with zirconia-porcelain crowns

Cited by 27 publications

References 52 publications

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

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

A comparative evaluation of the effect of liners on the shear bond strength of veneered zirconia block: An in vitro study

Fracture resistance and 3D finite element analysis of machined ceramic crowns bonded to endodontically treated molars with two planes versus flat occlusal preparation designs: an in vitro study

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