Fracture origin and crack propagation of CAD/CAM composite crowns by combining of in vitro and in silico approaches

Katsumoto, Yu; Hayashi, Kazushi; Aoki, Maika; Kunikata, Miwa; Nakase, Yutaro; Lee, Chunwoo; Imazato, Satoshi

doi:10.1016/j.jmbbm.2020.104083

Cited by 17 publications

(9 citation statements)

References 29 publications

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“…Given the challenges associated with the availability of and wide variation in teeth from donors, a surrogate for use as a die material has become inevitable. One approach is to utilize in-silico FEA to assess the crack initiation of composite crowns/ceramics 23) , whereas for in-vitro mechanical testing a choice of die materials has to be made. Die materials from natural teeth, metal and resin composite have been commonly used for testing purposes resulting in different outcomes.…”

Section: Discussionmentioning

confidence: 99%

Effect of supporting dies’ mechanical properties on fracture behavior of monolithic zirconia molar crowns

et al. 2022

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The aim of this study was to investigate the effects of supporting dies with different mechanical properties on the fracture strengths and failure modes of monolithic zirconia crowns, and identify a suitable die material for testing high-strength ceramic restorations. Thirty six dies from teeth, porous titanium and composite-resin with 36 zirconia crowns were fabricated based on 3D model. Crowns were cemented, then underwent load-to-fracture testing. Fractographic analysis was performed with scanning electron microscopy, and finite element analysis was made. During loading, a high stress concentration zone formed near the loading point and on surface of die. Cracks generated on failure penetrated the crown and extended to die in 9 teeth group specimens, while compositeresin samples exhibited fracture of both crowns and dies. All dies remained intact in porous titanium group. Fracture mode was undistinguishable in all groups. It was concluded that porous titanium appears suitable as die material for dental restorations with high fracture strength.

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Section: Discussionmentioning

confidence: 99%

Effect of supporting dies’ mechanical properties on fracture behavior of monolithic zirconia molar crowns

et al. 2022

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“…The analyses performed in the present study were linear and static. Nonlinear and dynamic analyses [ 27 , 28 , 29 ] may provide findings in an environment closer to actual clinical cases, likely allowing for more accurate evaluation of the effects of differences between the implant–abutment connection type and inter-implant distance.…”

Section: Discussionmentioning

confidence: 99%

Effects of Implant–Abutment Connection Type and Inter-Implant Distance on Inter-Implant Bone Stress and Microgap: Three-Dimensional Finite Element Analysis

et al. 2021

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The attainment of a good aesthetic outcome in dental implant treatment requires inter-implant papilla reconstruction, which is very difficult to perform. Maintenance of the inter-implant bone is essential for maintenance of the inter-implant papilla. The aim of this study was to investigate the mechanical influences of the implant–abutment connection type and inter-implant distance on the inter-implant bone by using three-dimensional finite element analysis. Three computer-aided design models of two-piece implants were designed: external connection (EC), internal connection (IC), and conical connection (CC). In each model, two identical implants were placed with inter-implant distances of 3.0, 2.5, and 2.0 mm. The maximum principal stress and microgap were evaluated. The stress values of the inter-implant bone decreased in the following order: IC, EC, and CC. The microgap decreased in the following order: EC, IC, and CC. Regardless of the type of implant–abutment connection, the stress of the inter-implant bone increased as the inter-implant distance decreased. The microgap barely changed as the inter-implant distance decreased. A CC implant is a mechanically advantageous implant–abutment connection type for maintenance of the inter-implant bone. With an inter-implant distance of less than 3.0 mm, use of a CC implant might suppress absorption of the inter-implant bone.

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“…4a). Elastic modulus, Poisson's ratio, density, and fracture strain of PC cured using the dual-cure mode were determined as per a previous study 14) (Table 2) and set for each model. A constant displacement of 0.05 mm was applied to a jig along the longitudinal axis, and another jig was fixed for all the directions.…”

Section: Nonlinear Dynamic Feamentioning

confidence: 99%

Novel testing method to evaluate the mechanical strength of self-adhesive resin cements with reflection of cement thickness

Kawashima

Mine

et al. 2021

Dent. Mater. J.

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This study aimed to propose an evaluation method for testing the mechanical strength of film-formed self-adhesive resin cements (SARCs) while reflecting cement layer thickness. Three commercially available dual-cure type SARCs were used for tensile and shear tests using specimens with varying thicknesses (0.05, 0.2, and 0.4 mm). There were no significant differences in tensile strengths among the various specimen thicknesses. In the shear test, there was a significant decrease in the strength with a reduction in specimen thickness. Stress distribution and fracture patterns were analyzed using in silico nonlinear dynamic finite element analysis. Finite element analysis demonstrated that stress distribution on the specimen surface was homogeneous even with different thicknesses in the tensile test, whereas it was inhomogeneous and induced different fracture patterns on the 0.05-mm-thick specimen in the shear test. These results suggest that the tensile test is useful for testing the mechanical strength of film-formed SARCs.

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Fracture origin and crack propagation of CAD/CAM composite crowns by combining of in vitro and in silico approaches

Cited by 17 publications

References 29 publications

Effect of supporting dies’ mechanical properties on fracture behavior of monolithic zirconia molar crowns

Effect of supporting dies’ mechanical properties on fracture behavior of monolithic zirconia molar crowns

Effects of Implant–Abutment Connection Type and Inter-Implant Distance on Inter-Implant Bone Stress and Microgap: Three-Dimensional Finite Element Analysis

Novel testing method to evaluate the mechanical strength of self-adhesive resin cements with reflection of cement thickness

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