Effects of cement thickness and bonding on the failure loads of CAD/CAM ceramic crowns: Multi-physics FEA modeling and monotonic testing

May, Liliana Gressler; Kelly, J. Robert; Bottino, Marco Antônio; Hill, Thomas J.

doi:10.1016/j.dental.2012.04.033

Cited by 160 publications

(118 citation statements)

References 32 publications

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“…Cyclic failure loads (500,000 cycles at 20 Hz) were evaluated using the staircase sensitivity design [24]. Initial loads were based on the monotonic results [15], anticipating that the cyclic loads would be around 40% of the monotonic failure loads. A step size load of 25 N was applied up or down to the next specimen, according to the survival or failure of the previous specimen.…”

Section: Wet Cyclic Loading Testmentioning

confidence: 99%

“…May et al [15] showed a significant influence of the occlusal cement thickness on the failure loads of feldspathic ceramic crowns, either under bonded or non-bonded conditions. This study took into account the polymerization shrinkage of the cement layer, demonstrating that this phenomenon can be directly related to the gap formation and to the increase of tensile stresses on the crown, resulting in decreasing failure loads over occlusal cement thickness ranging from 50 to 500 m.…”

Section: Introductionmentioning

confidence: 98%

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Influence of the resin cement thickness on the fatigue failure loads of CAD/CAM feldspathic crowns

et al. 2015

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Section: Wet Cyclic Loading Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Influence of the resin cement thickness on the fatigue failure loads of CAD/CAM feldspathic crowns

et al. 2015

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“…These studies determined that the cement thicknesses are between 25-100 µm [16] and 50-100 µm [17], respectively. On the other hand, May et al [18] found that the failure loads of feldspathic ceramic decreased under both bonded and non-bonded conditions as the cement thickness increased (50-500 µm). Previous 2D FEA studies used porcelain-veneered ceramic for all-ceramic crown material.…”

Section: Introductionmentioning

confidence: 96%

“…The authors reported that polymerization shrinkage of a thicker cement layer created higher level of stress on the internal occluso-axial angle under a bonded crown, while increased gaps were formed under a non-bonded crown [18]. For a bonded crown, the polymerization stresses of cement layer may become more influential factor as the cement thickness increased.…”

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confidence: 98%

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Biomechanical three-dimensional finite element analysis of monolithic zirconia crown with different cement thickness

Kim

Lee

et al. 2016

Ceramics International

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threedimensional finite element analysis of monolithic zirconia crown with different cement thickness, Ceramics International, http://dx. AbstractLimited information is available on the optimal cement thickness of monolithic zirconia crowns. This study was designed to evaluate the stress distribution in the posterior monolithic zirconia crowns with different cement thicknesses under masticatory force and maximum bite force using three-dimensional finite element analysis.The prepared and unprepared mandibular right first molar models were scanned and exported to the computeraided design system. Solid models of monolithic zirconia crowns, which were cemented on prepared teeth were generated. Four models were fabricated applying different cement thicknesses (100 µm, 200 µm, 400 µm, and 600 µm). The solid models were imported into the finite element analysis software and meshed into tetrahedral elements. Four three-dimensional finite element models were simulated under masticatory force and maximum bite force: vertical (axial), angular (45°) and horizontal loads of 280N at 5 points; vertical load of 700N at 8 points were loaded, respectively. The stress distribution varied with the different cement thicknesses and directions of applied loads. The monolithic zirconia crowns with cement thicknesses exceeding 200 µm had wider distributions of peak maximum principal stress under the same loading conditions. Monolithic zirconia crowns have more stress concentrations on the occlusal surfaces, while the cement layers have more stress concentrations on the cervical areas. Thicker cement layers were associated with more concentrated stresses on 2 the buccal and lingual cervical areas. The test results show that the cement thickness plays an essential role in the success of monolithic zirconia restorations in terms of reducing cement wash-out. Cement thickness of 100 µm is recommended for monolithic zirconia crowns.

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Resin cement coating reverts the machining damage on the flexural fatigue strength of lithium disilicate glass‐ceramic

et al. 2022

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This study evaluated the effect of resin cement coating with high and low viscosities on the flexural fatigue strength of machined lithium disilicate glass-ceramic. Discs (IPS e.max CAD; Ivoclar Vivadent) were prepared and divided according to the surface condition (machining [M]-CEREC inLab; and polishing [P]-laboratory procedures), resin cement coating (with or without), and cement viscosity (high [H] and low [L]). The ceramic bonding surface was etched/primed by a one-step primer application followed by resin cement application (Variolink N base + high or low viscosity catalyst; Ivoclar Vivadent). Biaxial flexural fatigue strength was evaluated on a pistonon-three-ball set by the step-test method (n = 15) (initial stress: 60 MPa; incremental steps: 20 MPa; 10,000 cycles/step, at 20 Hz). Weibull statistics were used for fatigue data. Contact angle, topographic, and fractographic analysis were also performed.Machining produced statistically lower contact angle than polishing and a significant detrimental effect on the fatigue behavior (σ 0 M = 247.2 [246.9-268.3]; σ 0 P = 337.4 [297.8-382.4]). Machined groups followed by resin cement coating (σ 0 MH = 297.9 [276.0-321.5]; σ 0 Ml = 301.2 [277.1-327.4]) behaved similarly to the polished and coated groups (σ 0 PH = 342.0 [308.9-378.5]; σ 0 PL = 357.3 [324.7-393.1]), irrespective of the cement viscosity. Therefore, cement coating has able to revert the detrimental effects of the machining on the fatigue strength of lithium disilicate glass-ceramic. High and low viscosity cements behaved similarly in the improvement of CAD-CAM lithium disilicate fatigue strength.

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Effects of cement thickness and bonding on the failure loads of CAD/CAM ceramic crowns: Multi-physics FEA modeling and monotonic testing

Cited by 160 publications

References 32 publications

Influence of the resin cement thickness on the fatigue failure loads of CAD/CAM feldspathic crowns

Influence of the resin cement thickness on the fatigue failure loads of CAD/CAM feldspathic crowns

Biomechanical three-dimensional finite element analysis of monolithic zirconia crown with different cement thickness

Resin cement coating reverts the machining damage on the flexural fatigue strength of lithium disilicate glass‐ceramic

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