Effect of resin hydrophilicity on tracer penetration. A preliminary study

Cynthia K.Y. Yiu, Franklin Chi Meng Tay, David Henry Pashley, Nigel M. King, Byoung I. Suh, Anut Itthagarun

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Purpose: To evaluate, by transmission electron microscopy, the extent of silver nitrate penetration into four polymerized resin blends with increasing degree of hydrophilicity after a period of 24 hours. Methods: The uncured resin was polymerized in an experimental composite inlay processing chamber under a pressurized nitrogen atmosphere maintained at 551.6 KPa and light-activated for one complete cycle at 125°C for 10 minutes. The resin blocks were sectioned occluso-gingivally into multiple 0.9 x 0.9 x 5 mm resin beams, and immersed in 50% basic, ammoniacal silver nitrate for 24 hours, exposed to a photodeveloping solution and prepared for transmission electron microscopy. The percentage distributions of silver deposits were compared using Kruskal-Wallis one-way analysis of variance (ANOVA) on ranks and Dunn's multiple comparison tests. Results: No silver uptake occurred in the two most hydrophobic resins (Groups 1 & 2). The percentage distributions of silver deposits in the more hydrophilic Group 3 (6.23±1.35%) and 4 (5.08±1.09%) resins were significantly higher (P< 0.05) than were found in the more hydrophobic resins but Groups 3 and 4 were not significantly different from each other. The intensity of silver uptake increased with hydrophilicity of the resin blends. TEM examination revealed two types of silver deposits: fine spotted-type silver grains, and islands of interconnecting electron-dense clusters of silver grains. Phase separation of resin components was observed in Group 4 resin blends.

Original languageEnglish (US)
Pages (from-to)160-164
Number of pages5
JournalAmerican journal of dentistry
Volume18
Issue number3
StatePublished - Jun 1 2005

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Hydrophobic and Hydrophilic Interactions
Silver
Silver Nitrate
Transmission Electron Microscopy
Inlays
Atmosphere
Analysis of Variance
Nitrogen
Electrons
Light

ASJC Scopus subject areas

  • Dentistry(all)

Cite this

Yiu, C. K. Y., Tay, F. C. M., Pashley, D. H., King, N. M., Suh, B. I., & Itthagarun, A. (2005). Effect of resin hydrophilicity on tracer penetration. A preliminary study. American journal of dentistry, 18(3), 160-164.

Effect of resin hydrophilicity on tracer penetration. A preliminary study. / Yiu, Cynthia K.Y.; Tay, Franklin Chi Meng; Pashley, David Henry; King, Nigel M.; Suh, Byoung I.; Itthagarun, Anut.

In: American journal of dentistry, Vol. 18, No. 3, 01.06.2005, p. 160-164.

Research output: Contribution to journalArticle

Yiu, CKY, Tay, FCM, Pashley, DH, King, NM, Suh, BI & Itthagarun, A 2005, 'Effect of resin hydrophilicity on tracer penetration. A preliminary study', American journal of dentistry, vol. 18, no. 3, pp. 160-164.
Yiu CKY, Tay FCM, Pashley DH, King NM, Suh BI, Itthagarun A. Effect of resin hydrophilicity on tracer penetration. A preliminary study. American journal of dentistry. 2005 Jun 1;18(3):160-164.
Yiu, Cynthia K.Y. ; Tay, Franklin Chi Meng ; Pashley, David Henry ; King, Nigel M. ; Suh, Byoung I. ; Itthagarun, Anut. / Effect of resin hydrophilicity on tracer penetration. A preliminary study. In: American journal of dentistry. 2005 ; Vol. 18, No. 3. pp. 160-164.
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abstract = "Purpose: To evaluate, by transmission electron microscopy, the extent of silver nitrate penetration into four polymerized resin blends with increasing degree of hydrophilicity after a period of 24 hours. Methods: The uncured resin was polymerized in an experimental composite inlay processing chamber under a pressurized nitrogen atmosphere maintained at 551.6 KPa and light-activated for one complete cycle at 125°C for 10 minutes. The resin blocks were sectioned occluso-gingivally into multiple 0.9 x 0.9 x 5 mm resin beams, and immersed in 50{\%} basic, ammoniacal silver nitrate for 24 hours, exposed to a photodeveloping solution and prepared for transmission electron microscopy. The percentage distributions of silver deposits were compared using Kruskal-Wallis one-way analysis of variance (ANOVA) on ranks and Dunn's multiple comparison tests. Results: No silver uptake occurred in the two most hydrophobic resins (Groups 1 & 2). The percentage distributions of silver deposits in the more hydrophilic Group 3 (6.23±1.35{\%}) and 4 (5.08±1.09{\%}) resins were significantly higher (P< 0.05) than were found in the more hydrophobic resins but Groups 3 and 4 were not significantly different from each other. The intensity of silver uptake increased with hydrophilicity of the resin blends. TEM examination revealed two types of silver deposits: fine spotted-type silver grains, and islands of interconnecting electron-dense clusters of silver grains. Phase separation of resin components was observed in Group 4 resin blends.",
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