Dimensional Accuracy of an Epoxy Die Material Using Different Polymerization Methods

Prisco, Rosario; Cozzolino, Giancarlo; Vigolo, Paolo

doi:10.1111/j.1532-849x.2008.00399.x

Cited by 14 publications

(10 citation statements)

References 33 publications

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“…However, after polymerization, monomers are linked by covalent bond, and the mean distance between monomers is reduced by 20%, which results in a significant volumetric shrinkage. 7,13 Thus, dies obtained from epoxy resins generally presented lower mean values, compared with those for the master model.…”

Section: Discussionmentioning

confidence: 93%

“…Despite these advantages, the volumetric shrinkage of resin die materials during polymerization has limited their widespread acceptance. 13 In this sense, type IV resin-impregnated die materials have been shown to be more dimensionally stable than conventional type V dental stone, 13 whereas another study found no significant differences between conventional gypsum and type IV resin-impregnated stone. 4 Epoxy resin die materials exhibit volumetric shrinkage in the range of 0.1-0.4%, 11 and a previous study related this type of material to improved dimensional accuracy over type IV and V resin-impregnated gypsum materials.…”

Section: Introductionmentioning

confidence: 99%

“…4 Epoxy resin die materials exhibit volumetric shrinkage in the range of 0.1-0.4%, 11 and a previous study related this type of material to improved dimensional accuracy over type IV and V resin-impregnated gypsum materials. 13 However, in spite of higher detail reproduction observed for the epoxy and polyurethane die materials, this advantage itself does not compensate for the drawbacks of these materials.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Discussionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2011

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“…Dimensional changes of resin cement due to polymerization shrinkage, thermal contraction, absorption of water, mechanical stress, dimensional changes in tooth structure, and effects of epoxy resin shrinkage on the dimension of the master cast can also affect the marginal gap. The variation of material and skill of the person who made the restorations may also influence the result.…”

Section: Discussionmentioning

confidence: 99%

Comparison of Marginal Fidelity and Surface Roughness of Porcelain Veneers Fabricated by Refractory Die and Pressing Techniques

Jha

Jain

Das

et al. 2013

Journal of Prosthodontics

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The mean surface roughness of veneers in cervical, mesio-incisal, and disto-incisal areas was 0.41 ± 0.25, 0.33 ± 0.14, and 0.32 ± 0.14 μm, respectively, for group I; and 0.31 ± 0.11, 0.36 ± 0.18, and 0.29 ± 0.11 μm, respectively, for group II. Intra- and intergroup comparisons showed no statistically significant values for all areas (p > 0.05). In 144 margins evaluated for each group, a visible gap was present in 15 (10.4%) and 18 (12.5%) recordings at 7 days for groups I and II, respectively. They increased to 19 (13.1%) and 20 (13.8%) after 3 months. These gaps were further broken down into percent distribution of total recordings at the cervical, incisal, mesial, and distal margins. Intragroup comparison was made using the Cochrane test. The chi-square test and Fisher's exact test were used for intergroup comparison of margins, revealing no statistical difference (p > 0.05) CONCLUSION: Within the limitations of the study, the surface roughness and marginal fidelity of porcelain veneers fabricated by refractory die technique and pressing technique were comparable.

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“…One is the use of epoxy resin die material 1) . However, dimensional accuracy and high cost restrict its prevalence.…”

Section: Introductionmentioning

confidence: 99%

A micro-mechanical evaluation of the effects of die hardener on die stone

Vuuren

Planitz

et al. 2010

Dent. Mater. J.

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The purpose of this study was to investigate the properties of a die hardener penetrated layer and evaluate its protective effects on the surface of die stone. A commercial die hardener (PDQ die hardener, Whipmix corp., USA) was tested on a die stone (GC Fujirock ® EP die stone, GC Europe, Belgium) and a dental plaster (Dental Stone, United States Gypsum Company, USA). Nanoindentation and micro-scratch tests were performed on both coated and uncoated specimens. The scratch damage was observed by SEM and the penetration depth of die hardener was detected by the affiliated EDX. Upon drying, the die hardener penetrated into the die stone to a depth of 3-5 µm, and deposited a thin film on the surface of die stone. Although the die hardener penetrated layer did not show improved mechanical properties, the die hardener film on the surface did protect the specimens from abrasion damage.

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Dimensional Accuracy of an Epoxy Die Material Using Different Polymerization Methods

Cited by 14 publications

References 33 publications

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

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

Comparison of Marginal Fidelity and Surface Roughness of Porcelain Veneers Fabricated by Refractory Die and Pressing Techniques

A micro-mechanical evaluation of the effects of die hardener on die stone

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