Comparison of transverse strength and dimensional variations between die stone, die epoxy resin, and die polyurethane resin

Derrien, G; Sturtz, G.

doi:10.1016/s0022-3913(05)80307-5

Cited by 25 publications

(24 citation statements)

References 24 publications

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“…[525] The development of synthetic resins allowed the search for alternatives to the use of dies, aiming at improved mechanical resistance and precision, such as the studies conducted by Derrien and Sturtz,[18] Dias et al .,[9] Gujjarlapudi et al . [11] Kumar and Garg,[26] Black,[21] and Lillywhite et al .…”

Section: Discussionmentioning

confidence: 99%

“…To obtain more accurate and durable dental casts, some alternative systems have been suggested such as die metallization, synthetic die, epoxy resin,[161718] polyurethane resin reinforced stone, and electroformed dies. [1920]…”

Section: Introductionmentioning

confidence: 99%

“…Acording to Derrien and Sturtz,[18] polyurethane resins are naturally flexible and provide sufficient transverse strength. Polyurethane is a biocompatible material and in dentistry it is used in several fields of expertise,[21] such as in prosthetics and implants studies, where it replaces the bone tissue in in-vitro assays.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the mechanical behavior and surface rugosity of different dental die materials

Niekawa¹,

Kreve²,

Ávila³

et al. 2017

J Int Soc Prevent Communit Dent

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Aim:This work evaluated the mechanical and surface behavior of different die materials. The studied materials are polyurethane resin Exakto-Form (Bredent), Gypsum type IV, Fuji Rock EP (Gc), and Durone (Dentsply).Materials and Methods:Two metallic matrices molded in polyvinyl siloxane provided 30 cylindrical test specimens for the diametral compression test and 30 hemispherical test specimens for the surface rugosity test. The cylindrical test specimens were submitted to tests of diametral compression strength using a DL2000 universal assay machine, with a load cell of 2000 Kgf and constant speed of 1 mm/min connected to the software. Kruskal–Wallis and Dunn's nonparametric tests were used to analyze the results. The hemispheres were submitted to the surface rugosity assay using a SJ201-P rugosimeter with a sensitivity of 300 μm, speed of 0.5 mm/s, and cut-off of 0.8 mm, and the readings were taken on the convex surface of the test specimens and metallic matrix. Results were analyzed using with Fisher's least significant differences test (LSD) and Dunnett's test.Results:Kruskal–Wallis test showed significant difference between die materials for diametral compression strength (P = 0.002). Dunn's test showed significantly higher values for modified polyurethane resin (Exakto-Form). The gypsum type IV, which did not significantly differ regarding diametral compression strength, showed 34.0% (Durone) and 42.7% (Fuji Rock) lower values in comparison to Exakto-Form.Conclusion:Within the parameters adopted in this study, it is possible to conclude that Exakto-Form polyurethane resin showed higher resistance to compression and was closer to the metallic matrix rugosity, and, along with the gypsum type IV Durone, showed better reproducibility of details relative to the Fuji Rock.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Analysis of the mechanical behavior and surface rugosity of different dental die materials

Niekawa¹,

Kreve²,

Ávila³

et al. 2017

J Int Soc Prevent Communit Dent

View full text Add to dashboard Cite

show abstract

“…The water-powder ratio is an important factor because its alteration can increase the porosity and decrease the strength of the stone. 8,9 As an alternative to gypsum, resin-impregnated gypsum, epoxy resin, and polyurethane resin have been shown to present superior abrasion resistance 7 and detail reproduction, compared with improved dental stones 4,5,10 . However, studies evaluating their dimensional accuracy have shown conflicting results.…”

Section: Introductionmentioning

confidence: 99%

Influence of the casting material on the dimensional accuracy of dental dies

et al. 2011

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The purpose of this study was to evaluate the dimensional accuracy of different materials used in the confection of dies. Two stainless steel standard models were confected. One of the models, which was 2 mm larger than the other model, was used to provide a uniform relief for the two-step putty-wash impression technique. Thirty impressions were obtained using a polyvinyl siloxane impression material and randomly divided into three groups (n = 10) according to the type of casting material: type IV dental stone, commercially available epoxy resin (TriEpoxy), and industrial epoxy resin (Sikadur). After the setting/polymerization of the casting material, the dimensional stability was measured in terms of the height, diameter of the base and diameter of the top from the obtained dies and from the standard metal model using a profile projector. Results were analyzed by ANOVA and Dunnet test (α = 0.05). In the height values, no significant difference was observed between the groups, except for Sikadur casts, which showed lower mean values. The Tri-Epoxi group showed statistically lower mean base diameter values, compared with the other groups, and both epoxy resin groups showed statistically lower mean top diameter values, compared with that for the type IV dental stone group. We concluded that type IV gypsum and the commercially available epoxy resin showed similar behavior in most areas. The industrial epoxy resin did not show the same characteristics, although the diameter of the base obtained with it was similar to that obtained with type IV dental stone.

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“…14,15 In the present in vitro study, dimensional accuracy, surface detail reproduction and transverse strength of conventional type IV, resin-modified gypsum and epoxy resin die materials are evaluated. Various methods have been reported in the literature to measure the dimensional accuracy of stone dies.…”

mentioning

confidence: 99%

Comparative Evaluation of Few Physical Properties of Epoxy Resin, Resin-Modified Gypsum and Conventional Type IV Gypsum Die Materials: An in vitro Study

Gujjarlapudi

Reddy²,

Madineni³

et al. 2012

The Journal of Contemporary Dental Practice

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Aim:To compare and evaluate few physical properties of epoxy resin, resin-modified gypsum and conventional type-IV gypsum die material. Materials and methods:In the present study, dimensional accuracy, surface detail reproduction and transverse strength of three die materials like epoxy resin (Diemet-E), resin-modified gypsum (Synarock) and conventional type-IV gypsum (Ultrarock) are analyzed. For dimensional accuracy, master die (Bailey's die) is used and calibrations were made with digital microscope. For surface detail reproduction and transverse strength, rectangular stainless steel master die (Duke's die) was used and calibrations were made with Toolmaker's microscope and Instron universal testing machine respectively. One-way analysis of variance (ANOVA) was performed on the means and standard deviation for groups of each test. Results:The results of the study showed statistically significant difference among these materials in dimensional accuracy, surface detail reproduction and transverse strength. Conclusion:Epoxy resin exhibited superiority in dimensional accuracy, surface detail reproduction and transverse strength and is nearest to the standards of accurate die material.

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Comparison of transverse strength and dimensional variations between die stone, die epoxy resin, and die polyurethane resin

Cited by 25 publications

References 24 publications

Analysis of the mechanical behavior and surface rugosity of different dental die materials

Analysis of the mechanical behavior and surface rugosity of different dental die materials

Influence of the casting material on the dimensional accuracy of dental dies

Comparative Evaluation of Few Physical Properties of Epoxy Resin, Resin-Modified Gypsum and Conventional Type IV Gypsum Die Materials: An in vitro Study

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