Effect of layer thickness on the flexural strength of multiple-unit laser-sintered metal frameworks

Kaleli, Necati; Uçar, Yurdanur; Ekren, Orhun; Ural, Çağrı

doi:10.1016/j.prosdent.2020.10.006

Cited by 4 publications

(12 citation statements)

References 28 publications

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“…In the present study, the hard metal milling and laser sinter-ing groups exhibited the highest load to fracture. The results were consistent with those of previous studies for laser sintered frameworks, 14,[56][57][58][59] and hard metal milled frameworks. 60 Conversely, other studies have reported the lowest flexural strength for hard metal milled frameworks.…”

Section: Discussionsupporting

confidence: 93%

Influence of Digital Technologies and Framework Design on the Load to Fracture of Co‐Cr Posterior Fixed Partial Denture Frameworks

Tobar

Rodríguez

López-Suárez

et al. 2021

Journal of Prosthodontics

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Purpose To compare the load to fracture of cobalt‐chromium (Co‐Cr) 3‐unit posterior fixed partial denture (FPD) frameworks manufactured by conventional and digital techniques and to evaluate the influence of the framework design on the fracture load. Material and methods Eighty 3‐unit Co‐Cr posterior FPD frameworks were fabricated with two designs: intermediate pontic (n = 40) and cantilever (n = 40). Each design was randomly divided into four groups (n = 10): casting, direct metal laser sintering, soft metal milling, and hard metal milling. After thermal cycling, all specimens were subjected to a 3‐point bending test until fracture. Data were statistically analyzed using one‐way ANOVA, Welch and Brown‐Forsythe test, Ryan‐Einot‐Gabriel‐Welsch F and Tamhane T2 post hoc test, Student's t test, and Weibull statistics (α = 0.05). Results Significant differences (p < 0.001; F = 39.59) were found among intermediate pontic frameworks (except between laser sintering and hard metal milling), and cantilevered frameworks (F = 36.75) (except between laser sintering and hard metal milling, and casting and soft metal milling). The cantilever groups showed load to fracture values significantly lower than those of the intermediate pontic (p < 0.001; F = 28.29). The Weibull statistics corroborated the results. Conclusions Hard metal milling and laser sintered frameworks exhibited the highest load to fracture values. However, all tested frameworks demonstrated clinically acceptable load to fracture values. The framework design directly affected the fracture load, with drastically lower values in cantilevered frameworks.

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Section: Discussionsupporting

confidence: 93%

Influence of Digital Technologies and Framework Design on the Load to Fracture of Co‐Cr Posterior Fixed Partial Denture Frameworks

Tobar

Rodríguez

López-Suárez

et al. 2021

Journal of Prosthodontics

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“…The specimens were designed by adhering to their dental morphology. In studies where mechanical properties are evaluated with metal frameworks, connector sizes are different from each other 6,18,19 . Although there is no consensus about minimum connector size for fixed partial dentures, it is well known that connector size must be increased as the length or the pontic number increases 20 .…”

Section: Discussionmentioning

confidence: 99%

“…Another advantage of the technology is that it allows production of final objects with almost unlimited designs. DMLS devices can manufacture all details in the computer‐aided design (CAD) data, such as undercuts, voids, and complex internal geometries 5–7 . Lattice structures can be fabricated within the closed‐hollow geometries.…”

mentioning

confidence: 99%

“…However, the group used a tensile test with dumb‐bell shape test specimens. For simulating clinical practice, a flexural strength test with a metal‐ceramic framework design is needed because bending properties have been more clinically relevant to test than pure tension 6,17–20 …”

mentioning

confidence: 99%

“…DMLS devices can manufacture all details in the computer-aided design (CAD) data, such as undercuts, voids, and complex internal geometries. [5][6][7] Lattice structures can be fabricated within the closed-hollow geometries. With this hollow design, not only can lighter objects be fabricated, but also the production time and the amount of powder used can be considerably reduced, and productivity can be increased dramatically.…”

mentioning

confidence: 99%

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Effect of Internal Design Modification on the Mechanical Properties of Laser Sintered Cobalt‐Chromium Multi‐Unit Metal‐Ceramic Frameworks

Koçak

Ekren

Uçar

2022

Journal of Prosthodontics

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Purpose The purpose of the study was to assess the effect of internal design modifications on the mechanical properties of multi‐unit Cobalt‐Chromium (Co‐Cr) metal‐ceramic frameworks manufactured by direct metal laser sintering. Material and methods Four‐unit fixed partial denture metal‐ceramic frameworks were digitally designed on a metal die model using 3D software. A total of 30 specimens were prepared using Co‐Cr alloy powder with direct metal laser sintering (n = 10). The control group specimens were solid where the inside of the specimens was completely full. For the test groups, the internal design of the framework was modified. Leaving the outer shell thickness of the framework at 0.5 mm, two different internal designs with hollow geometries were created (1.5 mm and 2 mm inner bar distances) and a cross section area of the connector was calculated. The weights of the specimens were measured and subjected to a 3‐point‐bending test at 1 mm/min crosshead speed. Data were statistically analyzed using One‐way ANOVA followed by Tukey (α = 0.05). Results There was a statistically significant difference among the groups in terms of weight of the specimens (p ≤ 0.05). However, no significant difference was observed among groups in term of both flexural strength and flexural modulus (p ≤ 0.05). Conclusions Within the limitations of the study, it was concluded that changing the internal design of the metal frameworks decreases the weight of the framework, but does not affect the flexural strength and flexural modulus. Therefore, clinical applications of internally modified frameworks seem promising for metal‐ceramic restorations.

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Evaluation of the flexural strength of metal frameworks fabricated by sintering-based computer-aided manufacturing methods

Kaleli

Ekren

Uçar

et al. 2022

The Journal of Prosthetic Dentistry

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Effect of layer thickness on the flexural strength of multiple-unit laser-sintered metal frameworks

Cited by 4 publications

References 28 publications

Influence of Digital Technologies and Framework Design on the Load to Fracture of Co‐Cr Posterior Fixed Partial Denture Frameworks

Influence of Digital Technologies and Framework Design on the Load to Fracture of Co‐Cr Posterior Fixed Partial Denture Frameworks

Effect of Internal Design Modification on the Mechanical Properties of Laser Sintered Cobalt‐Chromium Multi‐Unit Metal‐Ceramic Frameworks

Evaluation of the flexural strength of metal frameworks fabricated by sintering-based computer-aided manufacturing methods

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