Mechanical behavior of ceramic veneer in zirconia-based restorations: A 3- dimensional finite element analysis using microcomputed tomography data

Rocha, Eduardo Passos; Anchieta, Rodolfo Bruniera; Freitas-Júnior, Amilcar C.; Almeida, Érika Oliveira de; Cattaneo, Paolo M.; Ko, Ching Chang

doi:10.1016/s0022-3913(10)60184-9

Cited by 45 publications

(28 citation statements)

References 33 publications

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“…Guess et al reported that the shear bond strength of porcelain to metal was 27.6 MPa, while that of porcelain to zirconia was 9.4-11.5 MPa 14) . Rocha et al reported that an incomplete bond between the veneer and zirconia framework increased the stress in the ceramic veneer and induced veneer failure 26) . Therefore, an improved bonding system stronger than that afforded by the conventional fusing technique is of impending need.…”

Section: Discussionmentioning

confidence: 99%

Novel fabrication method for zirconia restorations: Bonding strength of machinable ceramic to zirconia with resin cements

et al. 2011

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A novel method was developed to fabricate all-ceramic restorations which comprised CAD/CAM-fabricated machinable ceramic bonded to CAD/CAM-fabricated zirconia framework using resin cement. The feasibility of this fabrication method was assessed in this study by investigating the bonding strength of a machinable ceramic to zirconia. A machinable ceramic was bonded to a zirconia plate using three kinds of resin cements: ResiCem (RE), Panavia (PA), and Multilink (ML). Conventional porcelain-fused-to-zirconia specimens were also prepared to serve as control. Shear bond strength test (SBT) and Schwickerath crack initiation test (SCT) were carried out. SBT revealed that PA (40.42 MPa) yielded a significantly higher bonding strength than RE (28.01 MPa) and ML (18.89 MPa). SCT revealed that the bonding strengths of test groups using resin cement were significantly higher than those of Control. Notably, the bonding strengths of RE and ML were above 25 MPa even after 10,000 times of thermal cycling -adequately meeting the ISO 9693 standard for metal-ceramic restorations. These results affirmed the feasibility of the novel fabrication method, in that a CAD/CAM-fabricated machinable ceramic is bonded to a CAD/CAM-fabricated zirconia framework using a resin cement.

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Section: Discussionmentioning

confidence: 99%

Novel fabrication method for zirconia restorations: Bonding strength of machinable ceramic to zirconia with resin cements

et al. 2011

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“…All materials were considered isotropic, homogeneous, and linearly elastic. A distributed load, in approximately 10 mm 2 [27] of 100 N, was applied to the lingual surface of the crown, near to the incisal edge, 458 to the long axes of the tooth for all models [28] (Fig. 2).…”

Section: Stress Measurementsmentioning

confidence: 99%

“…The refinement of the mesh was established through convergence analysis (6%) [27]. This technique allows for a balanced concentration of elements, avoiding the occurrence of excessive stress in small regions.…”

Section: Stress Measurementsmentioning

confidence: 99%

Influence of microthreads and platform switching on stress distribution in bone using angled abutments

Ferraz

Anchieta

Almeida

et al. 2012

Journal of Prosthodontic Research

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Purpose: To evaluate the stress distribution in peri-implant bone by simulating the effect of an implant with microthreads and platform switching on angled abutments through tridimensional finite element analysis. The postulated hypothesis was that the presence of microthreads and platform switching would reduce the stress concentration in the cortical bone. Methods: Four mathematical models of a central incisor supported by an implant (5.0 mm Â 13 mm) were created in which the type of thread surface in the neck portion (microthreaded or smooth) and the diameter of the angled abutment connection (5.0 and 4.1 mm) were varied. These models included the RM (regular platform and microthreads), the RS (regular platform and smooth neck surface), the SM (platform switching and microthreads), and the SS (platform switching and smooth neck). The analysis was performed using ANSYS Workbench 10.0 (Swanson Analysis System). An oblique load (100 N) was applied to the palatine surface of the central incisor. The bone/implant interface was considered to be perfectly integrated. Values for the maximum (s max ) and minimum (s min ) principal stress, the equivalent von Mises stress (s vM ), and the maximum principal elastic strain (e max ) for cortical and trabecular bone were obtained. Results: For the cortical bone, the highest s max (MPa) were observed for the RM (55.1), the RS (51.0), the SM (49.5), and the SS (44.8) models. The highest s vM (MPa) were found for the RM (45.4), the SM (42.1), the RS (38.7), and the SS models (37). The highest values for s min were found for the RM, SM, RS and SS models. For the trabecular bone, the highest s max values (MPa) were observed in the RS model (6.55), followed by the RM (6.37), SS (5.6), and SM (5.2) models. Conclusion: The hypothesis that the presence of microthreads and a switching platform would reduce the stress concentration in the cortical bone was partially rejected, mainly because the microthreads increased the stress concentration in cortical bone. Only platform switching reduced the stress in cortical bone.

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“…Additionally, finite element analysis showed that an incomplete union between these two ceramics increases (up to 12 times) the stress concentration in the porcelain, 28 whose mechanical properties are known to be lower than those of the infrastructure. Therefore, some effort has been made to improve this union, such as using a thin layer of glass between the materials.…”

Section: Groupsmentioning

confidence: 99%

Surface agents' influence on the flexural strength of bilaminated ceramics

et al. 2013

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The objective of this study was to evaluate the influence of different surface agents on the flexural strength of a ceramic system. Eighty bar-shaped specimens of zirconia were divided into four groups according to the agent to be used: group Control -to be cleaned with alcohol; group VM9 -application of a fluid layer of porcelain; group Effect Bonder -application of a bonding agent; and group Coloring Liquid -application of coloring liquid. All specimens received the porcelain application by the layering technique and were then subjected to thermocycling. The four-point bending test was performed to calculate the strength values (σ, MPa) and the failure modes were classified. ANOVA did not detect significant differences among the groups. The Weibull modulus were 5 (Control, VM9 and Effect Bonder) and 6 (Coloring Liquid). The cracking of the porcelain ceramic toward the interface was the predominant failure mode. It was concluded that the surface agents tested had no effect on the flexural strength of the bilaminated ceramic specimens.

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Mechanical behavior of ceramic veneer in zirconia-based restorations: A 3- dimensional finite element analysis using microcomputed tomography data

Cited by 45 publications

References 33 publications

Novel fabrication method for zirconia restorations: Bonding strength of machinable ceramic to zirconia with resin cements

Novel fabrication method for zirconia restorations: Bonding strength of machinable ceramic to zirconia with resin cements

Influence of microthreads and platform switching on stress distribution in bone using angled abutments

Surface agents' influence on the flexural strength of bilaminated ceramics

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