Fracture loads and failure modes of customized and non-customized zirconia abutments

Moris, Izabela Cristina Maurício; Chen, Yung Chung; Faria, Adriana Cláudia Lapria; Ribeiro, Ricardo Faria; Fok, Alex; Rodrigues, Rossana Lott

doi:10.1016/j.dental.2018.04.005

Cited by 8 publications

(9 citation statements)

References 23 publications

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“…The different surface finishing procedures can directly affect 5Y-PSZ microstructure by introducing residual stresses that can impair its mechanical properties 27 , 29 – 31 . The lowest microhardness values were associated with groups that received glazing or staining.…”

Section: Discussionmentioning

confidence: 99%

Translucency and mechanical behavior of partially stabilized monolithic zirconia after staining, finishing procedures and artificial aging

Silva

Fiorin

Faria

et al. 2022

Sci Rep

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Partially stabilized zirconia (5Y-PSZ) has been widely used to manufacture indirect monolithic restorations, and the effect of finishing procedures on the optical and mechanical properties of these materials are still unclear. The purpose of this study was to evaluate the effect of staining, polishing and glazing on surface roughness, crystalline phase content, microhardness, fracture toughness, dynamic elastic modulus, three-point flexural strength, strain distribution, color (∆E00/∆L/∆a/∆b), and translucency before and after artificial accelerated aging (water spray and ultraviolet) of 5Y-PSZ. Bar-shaped and rectangle-shaped specimens of the 5Y-PSZ were prepared and divided into six groups, according to finishing procedure: GC (control), GS (staining), GG (glazing), GSG (staining and glazing), GP (polishing), GSP (staining and polishing). There was a significant difference between groups for surface roughness (p < 0.05), dynamic elastic modulus (p = 0.007), microhardness (p = < 0.05), ∆E00 (p = 0.010), and ∆a (p = 0.008). GC presented higher cubic phase content, and the stained groups (GS, GSG and GSP) presented higher monoclinic content. The different finishing procedures affected roughness, dynamic elastic modulus, microhardness, and color of 5Y-PSZ; polishing being the finish that provides minors changes to the 5Y- PSZ. Accelerated artificial aging caused color change, regardless of finishing procedure used.

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Section: Discussionmentioning

confidence: 99%

Translucency and mechanical behavior of partially stabilized monolithic zirconia after staining, finishing procedures and artificial aging

Silva

Fiorin

Faria

et al. 2022

Sci Rep

Self Cite

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“…An implant-supported restoration was defined as 'successful' if it did not present any complication during the whole period after delivery [9,19]. The restoration was considered 'unsuccessful' if, although not failed and still physically present in the mouth, it presented or had presented during the period of follow-up any biological complications (peri-implant mucositis with gingival swelling, discomfort, and/or bleeding [20]; and/or periimplantitis with pain, suppuration, bleeding, and/or marginal bone resorption [21]); prosthetic (mechanical) complications [22,23] (problems affecting pre-formed components sold by the manufacturer, such as the loss of connection between abutment and implant, or fracture of the fixture or bonding base); or technical complications [23,24], (problems affecting the components designed by the dental technician, such as debonding of the upper portion of the zirconia abutment from the titanium base, fracture of the upper portion of the zirconia abutment, or decementation or chipping of the MZC [2,10,11]).…”

Section: B Success Of the Restorationmentioning

confidence: 99%

“…During the delivery of the temporary restoration, small adjustments in resin or polymethylmethacrylate (PMMA) can be tolerated at the level of interproximal contacts or occlusion, but these adjustments are not acceptable for monolithic ceramic restorations, such as zirconia [9,10]. The definitive monolithic zirconia restorations cannot be retouched in the mouth [10,11], so they must not show positional errors at delivery.…”

Section: Introductionmentioning

confidence: 99%

Artificial intelligence in fixed implant prosthodontics: a retrospective study of 106 implant-supported monolithic zirconia crowns inserted in the posterior jaws of 90 patients

et al. 2020

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Background: Artificial intelligence (AI) is a branch of computer science concerned with building smart software or machines capable of performing tasks that typically require human intelligence. We present a protocol for the use of AI to fabricate implant-supported monolithic zirconia crowns (MZCs) cemented on customized hybrid abutments. Methods: The study protocol consisted of: (1) intraoral scan of the implant position; (2) design of the individual abutment and temporary crown using computer-aided design (CAD) software; (3) milling of the zirconia abutment and the temporary polymethyl-methacrylate (PMMA) crown, with extraoral cementation of the zirconia abutment on the relative titanium bonding base, to generate an individual hybrid abutment; (4) clinical application of the hybrid abutment and the temporary PMMA crown; (5) intraoral scan of the hybrid abutment; (6) CAD of the final crown with automated margin line design using AI; (7) milling, sintering and characterisation of the final MZC; and (8) clinical application of the MZC. The outcome variables were mathematical (quality of the fabrication of the individual zirconia abutment) and clinical, such as (1) quality of the marginal adaptation, (2) of interproximal contact points and (3) of occlusal contacts, (4) chromatic integration, (5) survival and (6) success of MZCs. A careful statistical analysis was performed. Results: 90 patients (35 males, 55 females; mean age 53.3 ± 13.7 years) restored with 106 implant-supported MZCs were included in the study. The follow-up varied from 6 months to 3 years. The quality of the fabrication of individual hybrid abutments revealed a mean deviation of 44 μm (± 6.3) between the original CAD design of the zirconia abutment, and the mesh of the zirconia abutment captured intraorally at the end of the provisionalization. At the delivery of the MZCs, the marginal adaptation, quality of interproximal and occlusal contacts, and aesthetic integration were excellent. The three-year cumulative survival and success of the MZCs were 99.0% and 91.3%, respectively.

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“…Nevertheless, the precise mode of fracture of zirconia implants remained unclear in this study. 12 In a recent scanning electron microscopy (SEM) based in-vitro study, Moris et al 13 investigated the fracture modes of TI and customized and noncustomized ZAs. The SEM results showed that the Ti abutments underwent a plastic deformation, whereas the ZAs fractured following application of SL.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, in ZAs, the fracture occurred underneath the platform of the implant in the zone between the abutment and implant, which propagated to the abutments' internal surface. 13 Furthermore, in the study by Kim et al, 7 modes of failure of three types of ZAs were assessed. The results showed that there was a variation in the modes of fracture of the 3 ZAs used.…”

Section: Introductionmentioning

confidence: 99%

In Vitro Comparison of Modes of Failures among Titanium and One- and Two-piece Zirconia Abutment under Static Load

Alqahtani

AlAmar

2020

Eur J Dent

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ObjectivesThe objective was to assess modes of failures under static load (SL) among titanium (Ti) and one-and two-piece zirconia abutment (ZA) in vitro. Materials and MethodsThe Ti abutments were digitally scanned for the fabrication of the one-and two-piece zirconia abutment specimens. This was done to standardize the design of the one-piece abutment and make it the blueprint of the Ti abutment. Twenty-one implant abutments and 21 implant replicas were categorized into three groups as follows: group 1 (Titanium group), group 2 (one-piece ZA group), and group 3 (two-piece ZA group). A 250K-cycle, linear fatigue-load, reaching 10 to 210 Newton (N), was put on all specimens using an all-electric dynamic test instrument and the specimens were loaded until fracture. Statistical Analysis Assessment of mode of fracture among the groups was done visually. Significance was based below 0.05. Results Screw fracture (n = 7) and abutment bending at the apical part (n = 7) occurred in the Ti group. In the one-piece zirconia group, screw and abutment fractures occurred in seven and seven cases, respectively. In the two-piece zirconia group, screw fracture (n = 7) above the Ti zirconia junction (transgingival segment) and abutment fracture (n = 7) were determined as the failure modes. Conclusion In conclusion, all abutments underwent failures under SL in vitro; and the mode of failure modes varied among the different abutment designs used. AbstractKeywords ► fracture resistance ► mode of fracture ► static load ► titanium ► zirconia

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Fracture loads and failure modes of customized and non-customized zirconia abutments

Cited by 8 publications

References 23 publications

Translucency and mechanical behavior of partially stabilized monolithic zirconia after staining, finishing procedures and artificial aging

Translucency and mechanical behavior of partially stabilized monolithic zirconia after staining, finishing procedures and artificial aging

Artificial intelligence in fixed implant prosthodontics: a retrospective study of 106 implant-supported monolithic zirconia crowns inserted in the posterior jaws of 90 patients

In Vitro Comparison of Modes of Failures among Titanium and One- and Two-piece Zirconia Abutment under Static Load

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