CAD-FEA modeling and analysis of different full crown monolithic restorations

Piva, Amanda Maria de Oliveira Dal; Souza, Rodrigo Othávio de Assunção e; Bottino, Marco Antônio

doi:10.1016/j.dental.2018.06.024

Cited by 111 publications

(103 citation statements)

References 54 publications

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“…26 Some authors have reported that shear stress is the most prevalent stress on the cement layer, justifying the use of this in vitro test that evaluate this. 27 Thus, to overcome this limitations, we used a smaller adhesive area (2 mm 2 ), which gives more reliable results 4 . In addition, an orthodontic wire was used for the test with the aim of exerting a more uniform shear force on the adhesive interface.…”

Section: Discussionmentioning

confidence: 99%

Effect of hydrofluoric acid concentration and etching time on resin-bond strength to different glass ceramics

et al. 2019

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The objective of this study was to evaluate the effect of the hydrofluoridric acid (HF) concentration and time of acid conditioning on bond strength of three glass ceramics to a resin cement. Thus, fifty blocks (10 mm x 5 mm x 2 mm) of each ceramic (LDCAD: IPS e.max CAD; LCAD: IPS Empress CAD and LDHP: IPS e.max Press) were made and embedded in acrylic resin. The surfaces were polished with sandpaper (#600, 800, 1000, and 1200 grits) and blocks were randomly divided into 15 groups (n = 10) according to the following factors: Concentration of HF (10% and 5%), conditioning time (20 s and 60 s) and ceramic (LDCAD, LDHP, and L). After conditioning, silane (Prosil / FGM) was applied and after 2 min, cylinders (Ø = 2 mm; h = 2 mm) of dual resin cement (AllCem / FGM) were made in the center of each block using a Teflon strip as matrix and light cured for 40 s (1,200 mW/cm 2 ). Then, the samples were thermocycled (10,000 cycles, 5/55°C, 30s) and submitted to the shear bond test (50 KgF, 0.5 mm/min). The data (MPa) were analyzed with 3-way ANOVA and Tukey's test (5%). Failure analysis was performed using a stereomicroscope (20x) and a scanning electron microscope (SEM). ANOVA revealed that the "concentration" factor (p = 0.01) and the interaction "acid concentration X ceramic" (p = 0.009) had a significant effect, however, the "ceramic" (p = 0.897) and "conditioning time" (p = 0.260) factors did not influence the results. The LDHP10% 60s (10.98 MPa) aA* group presented significantly higher bond strength than LDHP10% 20s (6.57 MPa) bA , LCAD5% 20s (6,90 ±3,5) aB and LDHP5% 60s (5.66 ± 2,9MPa) aA* groups (Tukey). Failure analysis revealed that 100% of specimens had mixed failure. In conclusion, etching with 5% HF for 20 seconds is recommended for lithium disilicate and leucite-reinforced CAD/CAM ceramics. However, for pressed lithium disilicate ceramic, 10% HF for 60 s showed significantly higher bond strength to resin cement.

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Section: Discussionmentioning

confidence: 99%

Effect of hydrofluoric acid concentration and etching time on resin-bond strength to different glass ceramics

et al. 2019

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“…The incorporation of crystalline particles inside glasses matrices enables dental ceramics to reach high fracture resistance due to smaller crack propagations without compromising the final aesthetics (1). Among the main ceramics used in dentistry, lithium disilicate ceramics are noteworthy for their extensive indication: veneers, inlays, onlays (1), monolithic crowns (1,2), copings, fixed prostheses (1), hybrid abutments (3) and endocrowns (4). Another ceramic with a similar function is zirconia reinforced lithium silicate, possessing reinforcement crystals in the monosilicate phase instead of disilicate.…”

Section: Introductionmentioning

confidence: 99%

Reinforced Glass-ceramics: Parametric Inspection of Three-Dimensional Wear and Volumetric Loss after Chewing Simulation

et al. 2019

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The aim of this study was to investigate the three-dimensional wear, volumetric loss and surface roughness after chewing simulation of two glass ceramics. Lithium disilicate (LD, Emax CAD, Ivoclar) and Zirconia reinforced lithium silicate (ZLS, Vita Suprinity, Vita Zhanfabrick) discs (n=20/g) were scanned to obtain stereolithography (STL) files for each sample. All discs were submitted to chewing simulation with sliding configuration (30 N, 300,000 cycles, 6 mm and 1.7 Hz) with steatite as antagonist. The samples were then scanned again and the volume loss and the deepest defect depth was measured using the superimposed file from the baseline using three-dimensional digital parametric inspection software (GOM Inspect, Braunschweig, Germany). Surface roughness (Ra and Rz) was analyzed with a contact profilometer. Data were analyzed by one-way ANOVA and Tukey test (α=0.5%). ANOVA showed significant differences among the groups. Considering the ceramic volume loss, wear depth defect length and Rz roughness, LD (-22.09±5.57%; 0.80±0.06 µm; 3.08±1.02 µm) showed higher mean values than ZLS (-15.67±4.51%; 0.56±0.09 µm; 1.51±0.90 µm). Ra mean values were similar for both materials (p=0.064). All discs exhibited slight surface scratches along with the sliding direction with pitted wear patterns, while large cracks were observed on wear traces. These same areas can be identified in blue, overlapping the STL files before and after chewing simulation in inspection software. The linear reduction generated by sliding contact shows a graph with a similar wear pattern shape. ZLS was more resistant to wear than LD, with less volume loss and shallower surface defects.

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“…D ental ceramics are widely used in restorative treatments due to their excellent aesthetics, biocompatibility, and compressive strength [1]. Despite all the advances in ceramic material, the effects of tensile forces on restorations in function, especially in the posterior region [2][3][4][5], generate undesirable effects such as micro-cracks, delamination or catastrophic fractures due to the ceramic characteristic structures [6].…”

Section: Introductionmentioning

confidence: 99%

“…Some authors define that the multilayer arrangement provides early failure due to the incompatibility of materials with different mechanical properties [4]. Moreover, it is reported that, for multilayers design, the presence of a cement layer is responsible for absorbing part of the stress generated during loading [3] and reduces internal residual stress of polycrystalline ceramic system [4]. Thus, there is no data in the literature showing the biomechanical effect of a multilayer design of one glass ceramic system.…”

Section: Introductionmentioning

confidence: 99%

“…Among different methodologies used in dental material studies, finite element analysis (FEA) consists in a reliable mathematic method to analyze complex mechanical behavior conditions. This mathematical tool shows harmful stress concentration areas and the most probable points of failure [3]. However, in vitro complementary analyzes are recommended to consolidate the results [5].…”

Section: Introductionmentioning

confidence: 99%

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Stress distribution and failure load of multilayer and monolayer glass ceramic.

Archangelo

Penteado

Piva

et al. 2019

BDS

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This short report evaluated the differences in stress concentration and the load to fracture of multilayered and monolayer glass ceramic discs. Using a static structural analysis, the 3D model of the discs received a load of 150N and results in maximum principal stress were obtained. For the in vitro analysis, the samples (ø 12 mm) were submitted to a compressive test (100kgf, 1mm/min). The data was analyzed using one-way analysis of variance and Tukey test (α=5%). The monolayer group showed a lower stress peak (129.24 MPa) and higher load to fracture (118.38N) than the multilayered group with 211.04MPa and 48.34N, respectively. All samples presented catastrophic failure with its origin on the tensile surface. Therefore, the monolayer ceramic group showed superior mechanical behavior than the multilayered group.

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CAD-FEA modeling and analysis of different full crown monolithic restorations

Abstract: Materials with higher elastic modulus such as Co-Cr, zirconia and alumina enable higher tensile stress concentration on the crown intaglio surface and higher shear stress on the cement layer, facilitating crown debonding.

Cited by 111 publications

References 54 publications

Effect of hydrofluoric acid concentration and etching time on resin-bond strength to different glass ceramics

Effect of hydrofluoric acid concentration and etching time on resin-bond strength to different glass ceramics

Reinforced Glass-ceramics: Parametric Inspection of Three-Dimensional Wear and Volumetric Loss after Chewing Simulation

Stress distribution and failure load of multilayer and monolayer glass ceramic.

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