The effect of commercially pure titanium and alternative dental alloys on the marginal fit of one-piece cast implant frameworks

Torres, Érica Miranda de; Rodrigues, Rossana Lott; Mattos, Maria da Glória Chiarello de; Ribeiro, Ricardo Faria

doi:10.1016/j.jdent.2007.07.013

Cited by 57 publications

(41 citation statements)

References 21 publications

(43 reference statements)

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“…These findings reinforce that adjustments to achieve passive fit can be necessary in one-piece castings of multiple-unit implant frameworks (Torres et al, 2007). Besides that, they highlight the need for more studies to evaluate changes in the tissue biological response and prosthetic complications associated with possible correlations between prosthetic misfits and stresses on bone/ implant interface.…”

Section: Discussionsupporting

confidence: 65%

“…A custom tray was fabricated and a polyether (Impregum Soft, 3M ESPE, Seefeld, Germany) impression was made using square abutments (Conical Mini Pilar Transfer, Neodent, Curitiba-PR, Brazil) to duplicate the metal model, as described in previous study (Torres et al, 2007). The mold was poured to obtain a plaster cast (Durone V, Dentsply, Petró polis-RJ, Brazil).…”

Section: Specimen Fabricationmentioning

confidence: 99%

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Correlation between vertical misfits and stresses transmitted to implants from metal frameworks

Torres

Barbosa

Bernardes

et al. 2011

Journal of Biomechanics

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An inappropriate prosthetic fit could cause stress over the interface implant/bone. The objective of this study was to compare stresses transmitted to implants from frameworks cast using different materials and to investigate a possible correlation between vertical misfits and these stresses. Fifteen one-piece cast frameworks simulating bars for fixed prosthesis in a model with five implants were fabricated and arranged into three different groups according to the material used for casting: CP Ti (commercially pure titanium), Co-Cr (cobalt-chromium) or Ni-Cr-Ti (nickel-chromium-titanium) alloys. Each framework was installed over the metal model with all screws tightened to a 10 N cm torque and then, vertical misfits were measured using an optical microscope. The stresses transmitted to implants were measured using quantitative photoelastic analysis in values of maximum shear stress (τ), when each framework was tightened to the photoelastic model to a 10 N cm standardized torque. Stress data were statistically analyzed using one-way ANOVA and Tukey's test and correlation tests were performed using Pearson's rank correlation (α = 0.05). Mean and standard deviation values of vertical misfit are presented for CP Ti (22.40 ± 9.05 μm), Co-Cr (66.41 ± 35.47 μm) and Ni-Cr-Ti (32.20 ± 24.47 μm). Stresses generated by Co-Cr alloy (τ = 7.70 ± 2.16 kPa) were significantly higher than those generated by CP Ti (τ = 5.86 ± 1.55 kPa, p = 0.018) and Ni-Cr-Ti alloy (τ = 5.74 ± 3.05 kPa, p = 0.011), which were similar (p = 0.982). Correlations between vertical misfits and stresses around the implants were not significant as for any evaluated materials.

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Section: Discussionsupporting

confidence: 65%

Section: Specimen Fabricationmentioning

confidence: 99%

Correlation between vertical misfits and stresses transmitted to implants from metal frameworks

Torres

Barbosa

Bernardes

et al. 2011

Journal of Biomechanics

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“…In terms of internal fit, the lowest gap value was observed in the axial wall and the largest value in the occlusal. This is because the compatibility between the Co-Cr alloy and the investment material is worse than that of the Ni-Cr alloy and the investment material 3334…”

Section: Discussionmentioning

confidence: 99%

Evaluation of marginal and internal gaps of Ni-Cr and Co-Cr alloy copings manufactured by microstereolithography

Kim

et al. 2017

J Adv Prosthodont

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PURPOSEThe purpose of this study was to evaluate the marginal and internal gaps of Ni-Cr and Co-Cr copings, fabricated using the dental µ-SLA system.MATERIALS AND METHODSTen study dies were made using a two-step silicone impression with a dental stone (type IV) from the master die of a tooth. Ni-Cr (NC group) and Co-Cr (CC group) alloy copings were designed using a dental scanner, CAD software, resin coping, and casting process. In addition, 10 Ni-Cr alloy copings were manufactured using the lost-wax technique (LW group). The marginal and internal gaps in the 3 groups were measured using a digital microscope (160 ×) with the silicone replica technique, and the obtained data were analyzed using the non-parametric Kruskal-Wallis H test. Post-hoc comparisons were performed using Bonferroni-corrected Mann-Whitney U tests (α=.05).RESULTSThe mean (±standard deviation) values of the marginal, chamfer, axial wall, and occlusal gaps in the 3 groups were as follows: 81.5±73.8, 98.1±76.1, 87.1±44.8, and 146.8±78.7 µm in the LW group; 76.8±48.0, 141.7±57.1, 80.7±47.5, and 194.69±63.8 µm in the NC group; and 124.2±52.0, 199.5±71.0, 67.1±37.6, and 244.5±58.9 µm in the CC group.CONCLUSIONThe marginal gap in the LW and NC groups were clinically acceptable. Further improvement is needed for CC group to be used clinical practice.

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“…Many researchers do not recommend casting multipoint metal substructures as one segment because of thermal shrinking of a metal [1], which results in no passive adhesion of the metal structure [2,3]. The problem can be solved by making a metal structure as several fragments and, subsequently, joining them by gas-or laser-welding.…”

Section: Introductionmentioning

confidence: 99%

Welding of Prosthetic Alloys / Spawanie Stopów Protetycznych Typu Co-Cr

Wojciechowska¹,

Wołowiec‐Korecka²,

Klimek³

2015

Archives of Metallurgy and Materials

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This paper presents the techniques of joining metal denture elements, used in prosthetic dentistry: the traditional soldering technique with a gas burner and a new technique of welding with a laser beam; the aim of the study was to make a comparative assessment of the quality of the joints in view of the possibility of applying them in prosthetic structures. Fractographic examinations were conducted along with tensile strength and impact strength tests, and the quality of the joints was assessed compared to the solid metal. The experiments have shown that the metal elements used to make dentures, joined by the technique which employs a laser beam, have better strength properties than those achieved with a gas burner.

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The effect of commercially pure titanium and alternative dental alloys on the marginal fit of one-piece cast implant frameworks

Cited by 57 publications

References 21 publications

Correlation between vertical misfits and stresses transmitted to implants from metal frameworks

Correlation between vertical misfits and stresses transmitted to implants from metal frameworks

Evaluation of marginal and internal gaps of Ni-Cr and Co-Cr alloy copings manufactured by microstereolithography

Welding of Prosthetic Alloys / Spawanie Stopów Protetycznych Typu Co-Cr

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