Shark fin test and impression quality: A correlation analysis

Balkenhol, Markus; Wöstmann, Bernd; Kanehira, Masafumi; Finger, Werner J.

doi:10.1016/j.jdent.2006.11.009

Cited by 22 publications

(16 citation statements)

References 13 publications

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“…Regarding 200-μm sulcus width, all impressions obtained adequate sulcus reproductions of 0.5 mm. These results confirm the findings in previous studies 8,10,11) . As a result, opening of the sulcus to approximately 200-μm width using a correct retraction cord technique is considered effective for good sulcus reproduction.…”

Section: Discussionsupporting

confidence: 93%

“…The shark fin test was developed as a simulated application of impression materials reflecting flow properties. Using a device consisting of a split cylinder with a V-shaped slit, the fin height of the penetrated impression material is determined 8) . A linear simulation model was designed to evaluate penetration characteristics of elastomeric impression materials, using agar gel as the moist gingival/periodontal tissue 9) .…”

Section: Introductionmentioning

confidence: 99%

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Effects of the space for wash materials on sulcus depth reproduction with addition-curing silicone using two-step putty-wash technique

et al. 2013

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Aim of this study was to investigate effects of space thickness and consistency of wash materials on sulcus depth reproduction with silicone impressions, low (L), medium (M), and very high consistency (VH), using two-step putty-wash technique. Impressions were taken from truncated cones with 50-, 100-, or 200-μm-wide sulci, using the combinations L+VH or M+VH and different space thickness for wash materials: 2 mm (ST2), 1 mm (ST1), and approximately 25 μm (ST0.025). Sulcus depth reproduction tended to increase with increasing sulcus width. Sulcus reproduction of ST0.025 was deeper than those of the other groups. At 100-and 200-μm sulcus widths, sulcus reproductions of ST1 and ST2 with L+HV were deeper than with M+HV. Regardless of consistency, the thin spacer produced deep reproduction. Adequate 0.5 mm sulcus reproductions were obtained with 100 and 200 μm wide sulci and 1-and 2-mm spacer widths, combined with low consistency impression material.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Effects of the space for wash materials on sulcus depth reproduction with addition-curing silicone using two-step putty-wash technique

et al. 2013

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“…Although the flow properties of alginates and PVS have not been directly compared, PVS has demonstrated exceptional flow properties. 22,23 The high level of detail reproduction produced by alginate substitutes in this study can therefore be credited to the flow properties of PVS.…”

Section: Discussionmentioning

confidence: 93%

Evaluation of Outgassing, Tear Strength, and Detail Reproduction in Alginate Substitute Materials

Baxter¹,

Lawson²,

Çakır³

et al. 2012

Operative Dentistry

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Alginate substitute materials are inexpensive polyvinyl siloxane (PVS) impression materials that exhibit better detail reproduction and tear strength than alginate. Alginate substitute materials do show slightly more outgassing and resulting cast porosity than traditional alginates, particularly when they are poured soon after mixing. To reduce cast surface porosity, a minimum pouring delay of 60 minutes is suggested. SUMMARYObjective: To compare three alginate substitute materials to an alginate impression material for cast surface porosity (outgassing), tear strength, and detail reproduction.Materials and Methods: Detail reproduction tests were performed following American National Standards Institute/American Dental Association (ANSI/ADA) Specification No. 19. To measure tear strength, 12 samples of each material were made using a split mold, placed in a water bath until testing, and loaded in tension until failure at a rate of 500 mm/min using a universal testing machine. For cast surface porosity testing, five impressions of a Teflon mold with each material were placed in a water bath (37.88C) for the in-mouth setting time and poured with vacuum-mixed Silky Rock die stone at 5, 10, 30, and 60 minutes from the start of mixing. The gypsum samples were analyzed with a digital microscope for surface porosity indicative of hydrogen gas release by comparing the surface obtained at each interval with four casts representing no,

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“…The siloxane groups on the polymer chain allow for the material to be dimensionally stable and recover from deformation while being combined with the hydrophilic properties of the polyether groups. Studies have been performed to assess the detail reproduction, 12,13 wettability, 13 dimensional accuracy, 14 and flow 12 of the hybrid materials; however, conflicting evidence prevents generalizations regarding the material to be widely accepted.…”

mentioning

confidence: 99%