Effect of screw-access hole and mechanical cycling on fracture load of 3-unit implant-supported fixed dental prostheses

Mallmann, Fernando; Rosa, Luciano Pereira; Borba, Márcia; Bona, Álvaro Della

doi:10.1016/j.prosdent.2017.01.016

Cited by 16 publications

(12 citation statements)

References 33 publications

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“…In the PFM group, fracture occurred both within the veneering porcelain and in the interface between metal coping and the veneering porcelain. This was in line with Mallmann et al's study [13], which reported that, unlike the zirconia-based restorations, porcelain fracture in restorations with metal frameworks mostly reached the framework. This is because of the adequate interfacial bond between the zirconia and porcelain.…”

Section: Fracture Modessupporting

confidence: 90%

“…Malpartida-Carrillo et al [12] reported that cement and combined cement-and screw-retained metal-ceramic molar restorations had comparable fracture resistance with 15˚-angulated abutments. On the contrary, Mallmann et al [13] found that screw-retained zirconia-based implant-supported fixed dental prostheses were less fracture-resistant than cement-retained prostheses. They also concluded that zirconia-based restorations were more fracture-resistant than metal-based restorations.…”

Section: Introductionmentioning

confidence: 96%

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The effect of aging on the fracture resistance of different types of screw-cement-retained implant-supported zirconia-based restorations

2022

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Structural durability of screw-cement-retained implant-supported zirconia-based restorations is an important factor in choosing the best type of restoration for clinical use. This study aimed to evaluate the effects of thermocycling on the fracture resistance of different types of screw-cement-retained implant-supported zirconia-based restoration. Two experimental groups (monolithic zirconia and porcelain-veneered zirconia) and a control group of porcelain-fused-to-metal restorations were fabricated via CAD-CAM (n = 14 per group). Half of the specimens of each group (n = 7) were subjected to 10000 thermal cycles. The compressive force was applied and the force leading to fracture was measured by using a Universal Testing Machine. The fractured modes were classified under a scanning electron microscope. The data were analyzed through two-way ANOVA, one-way ANOVA, and independent samples t-test (α = 0.05). Among the non-thermocycled subgroups, the monolithic zirconia specimens were significantly more fracture-resistant than the porcelain-veneered zirconia and porcelain-fused-to-metal groups (P<0.05); but it was not the same with aging (P>0.05). Thermocycling decreased the fracture resistance of all groups; however, the difference was not statistically significant (P<0.05). The monolithic zirconia presented higher fracture resistance than the bilayered restorations for screw-cement retained implant-supported restorations. Thermocycling decreased the fracture resistance of all types of restorations insignificantly which can be clinically important.

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Section: Fracture Modessupporting

confidence: 90%

Section: Introductionmentioning

confidence: 96%

The effect of aging on the fracture resistance of different types of screw-cement-retained implant-supported zirconia-based restorations

2022

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“…Easier access and retrievability, in case of screw loosening, screw fractures and repair or even exchange of the whole reconstruction are in favor of screw‐retention 45 . However, the occlusal access channel might compromise the fracture resistance of implant‐supported restoration due to structural discontinuity 44,46 . Yet, a laboratory study could not find a significant influence of screw channels on fatigue behavior of monolithic LDS, zirconia or bi‐layer zirconia crowns 45 .…”

Section: Discussionmentioning

confidence: 99%

Failure Load of Monolithic Lithium Disilicate Implant‐Supported Single Crowns Bonded to Ti‐base Abutments versus to Customized Ceramic Abutments after Fatigue

Spitznagel

Bonfante

Vollmer

et al. 2021

Journal of Prosthodontics

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Purpose This laboratory study analyzed the influence of retention mode (screw‐ vs cement retained) and fatigue application on the failure load of monolithic lithium‐disilicate (LDS) implant‐supported single crowns (ISSC). Material and Methods A total of 72 samples of monolithic LDS (*Ivoclar Vivadent) ISSC were divided into three groups (n = 24) according to their type of retention mode: Group Ti‐CAD: Titanium base (SICvantage CAD/CAM Abutment red (SIC invent AG), screw‐retained milled monolithic LDS (IPS e.max CAD*); Group Ti‐P: Titanium base (SICvantage CAD/CAM Abutment red), screw‐retained pressed monolithic LDS (IPS e.max Press*) and Group Ti‐Cust: Titanium base with cemented press LDS (IPS e.max Press*) crown on a LDS (IPS e.max Press*) custom abutment. A mandibular first molar implant‐supported single crown model was investigated (Titanium implant: SICvantage‐max, SIC invent AG, diameter: 4.2 mm, length: 11.5 mm). Half of each group (n = 12) were exposed to fatigue with cyclic mechanical loading (F = 198 N, 1.2 million cycles) and simultaneous thermocycling (5‐55°C). Single load to failure testing was performed, before (Subgroups Ti‐CAD, Ti‐P, and Ti‐Cust) and after (Subgroups Ti‐CAD‐F, Ti‐P‐F, and Ti‐Cust‐F) fatigue. Weibull distribution was used to determine the characteristic strength and Weibull modulus differences between groups. Probability of survival at 900N load was calculated. Results No samples failed during fatigue. Characteristic strength values were as follow: Ti‐CAD: 3259.5N, Ti‐CAD‐F: 2926N, Ti‐P: 2763N, Ti‐P‐F: 2841N, Ti‐Cust: 2789N, Ti‐Cust‐F: 2194N. Whereas no difference was observed between pressed or milled monolithic crowns cemented to Ti‐base, regardless of loading condition, fatigue decreased the characteristic strength of crowns cemented to custom abutments. Probability of survival at 900 N was not significantly different between groups. Conclusions Screw‐retained pressed or milled monolithic LDS ISSC, cemented directly to Ti‐base abutments or LDS crowns cemented to custom ceramic abutments resist physiological chewing forces after simulated 5‐year aging in the artificial mouth and presented equally high probability of survival. However, a significant decrease in load to failure was observed in LDS crowns cemented to custom ceramic abutments after fatigue. Prospective clinical trials are needed to confirm the results of this laboratory investigation.

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“…Ante o exposto, destaca-se que o fisiculturismo amador ou profissional pode ser considerado um esporte que objetiva desenvolver ou transformar o tamanho, forma, simetria, definição e qualidade estética do físico. Na maioria das vezes, o desempenho nessa modalidade esportiva, independente da categoria, requer principalmente a combinação do treinamento de força associado à nutrição e ao uso de medicamentos (MACHADO, 2020), além de adotar práticas nutricionais e farmacológicas ainda pouco estudadas pela ciência (MALLMANN;ALVES, 2018). Além disso, há um conjunto de rotinas sacrificantes, que aqui denominamos de práticas bioascéticas (MACHADO; FRAGA, 2022).…”

Section: Considerações Introdutóriasunclassified

Do Palco Ao Túmulo

Machado¹,

Silva²

2023

Corpoconsciência

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O presente estudo objetivou compreender como especificamente os jornais e revistas online abordam a morte de fisiculturistas. A partir de uma pesquisa documental, houve a análise de conteúdo de 22 reportagens publicadas entre os anos de 2015 e 2021. Os resultados indicaram que as notícias abordam a utilização indevida ou exacerbada de anabolizantes, sugerem uma aproximação entre os atletas e os praticantes comuns de atividade física no que se refere ao uso dos produtos e, por fim, culpabilizam os fisiculturistas mortos pelas supostas “bombas”. Conclui-se que as enunciações midiáticas indicam um tipo ideal e moral de “viver” e “morrer” dos fisiculturistas, o que leva uma forma de construção social sobre esse esporte, a partir de certos preconceitos, discriminações ou estigmas que colocam em xeque a pluralidade de “ser corpo” e as próprias normas de beleza ou de saúde das sociedades contemporâneas.

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Effect of screw-access hole and mechanical cycling on fracture load of 3-unit implant-supported fixed dental prostheses

Cited by 16 publications

References 33 publications

The effect of aging on the fracture resistance of different types of screw-cement-retained implant-supported zirconia-based restorations

The effect of aging on the fracture resistance of different types of screw-cement-retained implant-supported zirconia-based restorations

Failure Load of Monolithic Lithium Disilicate Implant‐Supported Single Crowns Bonded to Ti‐base Abutments versus to Customized Ceramic Abutments after Fatigue

Do Palco Ao Túmulo

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