Comparative fracture strength analysis of Lava and Digident CAD/CAM zirconia ceramic crowns

Kwon, Taesoo; Pak, Hyun-Soon; Yang, Jae‐Ho; Han, Jung‐Suk; Lee, Jai-Bong; Kim, Sunghun; Yeo, In‐Sung

doi:10.4047/jap.2013.5.2.92

Cited by 11 publications

(10 citation statements)

References 19 publications

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“…Therefore, the technique and the low mechanical properties of the veneer material may be the reason for this mode of failure as well as for the lower fracture strength presented by specimens in BL group, since the inner coping was still intact after the mechanical testing. In contrast, there are some researches reporting complete failure (core/veneer) of all Lava CAD/CAM crowns [ 7 ] and total coping fracture [ 17 ].…”

Section: Discussionmentioning

confidence: 99%

“…However, the evaluation of clinical survival rates of posterior all-ceramic crowns and fixed dental prostheses (FDPs) reveals the vulnerability of those systems to various failure modes [ 4 – 6 ]. Therefore, several attempts have been made to improve the fracture strength of all-ceramic restorations, including the use of Yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) due to its higher flexural strength [ 7 ] that allows the manufacturing of fixed partial prostheses (FPPs) in areas of high masticatory loads [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

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Fracture Strength of Aged Monolithic and Bilayer Zirconia-Based Crowns

Lameira

Silva

et al. 2015

BioMed Research International

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The purpose of this study was to evaluate the effect of design and surface finishing on fracture strength of yttria-tetragonal zirconia polycrystal (Y-TZP) crowns in monolithic (1.5 mm thickness) and bilayer (0.8 mm zirconia coping and 0.7 mm porcelain veneer) configuration after artificial aging. Bovine incisors received crown preparation and Y-TZP crowns were manufactured using CAD/CAM technique, according to the following groups (n = 10): Polished monolithic zirconia crowns (PM); Glazed monolithic zirconia crowns (GM); Bi-layer crowns (BL). Crowns were cemented with resin cement, submitted to artificial aging in a chewing simulator (2.5 million cycles/80 N/artificial saliva/37°C), and tested for fracture strength. Two remaining crowns referring to PM and GM groups were submitted to a chemical composition analysis to measure the level of yttrium after aging. One-way ANOVA and Tukey's test (P = .05) indicated that monolithic zirconia crowns presented similar fracture strength (PM = 3476.2 N ± 791.7; GM = 3561.5 N ± 991.6), which was higher than bilayer crowns (2060.4 N ± 810.6). There was no difference in the yttrium content among the three surfaces evaluated in the monolithic crowns. Thus, monolithic zirconia crowns present higher fracture strength than bilayer veneered zirconia after artificial aging and surface finishing does not affect their fracture strength.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fracture Strength of Aged Monolithic and Bilayer Zirconia-Based Crowns

Lameira

Silva

et al. 2015

BioMed Research International

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“…The load was applied on each specimen until catastrophic failure occurred. Catastrophic failure was defined as exhibition of visible cracks and events of chipping or fracture [27]. The failure load was recorded in newton on a reading monitor for each sample, and the fractured crowns were examined under the stereomicroscope to determine the fracture mode of each sample which was classified as following [18, 27, 28]: Mode I: visible cracks in the crown. Mode II: veneer chipping. Mode III: bulk fracture of the crown.…”

Section: Methodsmentioning

confidence: 99%

Effect of Incisal Porcelain Veneering Thickness on the Fracture Resistance of CAD/CAM Zirconia All-Ceramic Anterior Crowns

Badran

Kader

Al-Abbassy

2019

International Journal of Dentistry

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Statement of Problem. In some clinical situations, the vertical length of either a prepared tooth or an implant abutment is short, while the occlusal clearance to be restored by a porcelain crown is large. Incisal thickness of the veneering porcelain should be considered to prevent mechanical failure of the crown. Purpose. The aim of this study is to evaluate the effect of two different incisal veneering porcelain thickness on the fracture resistance of the anterior all-ceramic CAD/CAM zirconia crown system as compared with the conventionally used metal ceramic crown system. Method. CAD/CAM zirconia all-ceramic and metal ceramic crowns were fabricated on the prepared dies with standardized dimensions and designs using standardized methods according to the manufacturer’s instructions. All crowns were then adhesively luted with resin-based cement (Multilink cement system), subjected to thermal cycling and cyclic loading, and were loaded until fracture using the universal testing machine to indicate the fracture resistance for each crown material in each veneering thickness. Results. Statistical analysis was carried out, and the results showed that the fracture resistance of the nickel-chromium metal ceramic group was significantly higher than that of the CAD/CAM zirconia all-ceramic group. Also, the fracture resistance of crowns with 1.5 mm incisal veneering thickness was significantly higher than those with 3 mm incisal veneering thickness in both groups. Furthermore, there was no significant difference in the fracture mode of the two groups where 50% of the total specimens demonstrated Mode II (veneer chipping), while 35% demonstrated Mode I (visible crack) and only 15% demonstrated Mode III (bulk fracture). Conclusion. High failure load values were demonstrated by the specimens in this study, which suggest sufficient strength of both incisal veneering thickness in both crown systems to withstand clinical applications; however, the fracture patterns still underline the requirement of a core design that support a consistent thickness of the veneering ceramic, and it is recommended to conduct long-term prospective clinical studies to confirm findings reported in the present study.

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“…On testing and comparing the above materials, it was concluded that the performance of VMII crowns was superior to YZ crowns in the fatigue test, and Lava crowns showed a complete fracture of both the veneering porcelain and the core, whereas the Digident crowns showed fracture only of the veneering porcelain. [15] Kwon et al [15] conducted a study where they compared the fracture strengths of two CAD/CAM zirconia crown systems that is Lava and Digident. Zahran et al [9] in their study compared fracture strength and fatigue resistance of In-Ceram YZ crowns and feldspathic all-ceramic crowns made with CAD/CAM.…”

Section: Discussionmentioning

confidence: 99%

Comparative analysis of fatigue resistance, fracture strength, and fracture patterns in ceramic crowns with zirconia and direct metal laser-sintered cores - An in vitro study

Manoharan¹,

Rajasimhan²,

Livingstone³

et al. 2018

JCRI

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Purpose: Core materials in metal-ceramic crowns have metal, and all-ceramic crowns may have a zirconia substructure. These core materials are used to reinforce the strength of the prosthesis. The various metal substructures were compared to study the fracture strength and bond failure between the core structure and the layered ceramic. Digital metal laser-sintered (DMLS) substructures can be fabricated to thinner sections of up to 0.3mm. In conditions where there is a need for lesser reduction of tooth structure, the DMLS structures can be a viable alternative to zirconia substructures. The conducted study was intended to evaluate the fracture strength in ceramic crowns with DMLS and zirconia cores. Materials and Methods: A prepared tooth with standardized dimensions was generated using computer-aided design software and milled in metal. Impression of die was made, and 40 epoxy resin dies were prepared. Then, 20 DMLS substructures (Group I) and 20 Zirconia substructures (Group II) were made following in which ceramic veneering was done. Group I is divided into Group I(A) (10 crowns for the load to fracture) and Group I(B) (10 crowns for fatigue test). Group II is divided into Group II(A) (10 crowns for the load to fracture) and Group II(B) (10 crowns for fatigue test). All crowns were cemented to their respective dies using Type I glass ionomer luting cement. All crowns were subjected to thermocycling (5000 cycles) and Group I(A) & Group II(A) crowns were tested for load to fracture , and observational analysis of fracture pattern was carried out. The data were analyzed using SPSS software. Mean and standard deviation were estimated from the samples of each test group. Descriptive statistics was used to find the mean and standard deviation variables. Levene's test was used to test the equality of variances for independent "t" test. Results and Conclusion: The amount of load to fracture for Group I(A) was high with 3163.96 ± 525.27 and that for Group II(A) was 2077.1 ± 388.97. The difference between the mean was found statistically significant (P=0.005). Both DMLS crowns group I(B) and Zirconia crowns group II(B) showed good fatigue resistance on observational examination and there is no evidence of no cracks or fracture at the end of fatigue test. Hence, crowns from both groups expected to resist crack propagation when used clinically. Hence, it may be concluded that mean load to fracture between Groups I(A) and Group II(A) significantly differs.

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Comparative fracture strength analysis of Lava and Digident CAD/CAM zirconia ceramic crowns

Cited by 11 publications

References 19 publications

Fracture Strength of Aged Monolithic and Bilayer Zirconia-Based Crowns

Fracture Strength of Aged Monolithic and Bilayer Zirconia-Based Crowns

Effect of Incisal Porcelain Veneering Thickness on the Fracture Resistance of CAD/CAM Zirconia All-Ceramic Anterior Crowns

Comparative analysis of fatigue resistance, fracture strength, and fracture patterns in ceramic crowns with zirconia and direct metal laser-sintered cores - An in vitro study

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