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Developments in denture teeth to prevent softening by food solvents.

Authors:
Shakeel A Shahdad John F McCabe Robert W Wassell

J Mater Sci Mater Med 2007 Aug 5;18(8):1599-603. Epub 2007 May 5.

Restorative Dentistry, The Royal London Dental Hospital, New Road, London, UK.

The effect of various food-simulating solvents on the hardness of denture teeth after varying storage times, using a Martens hardness test was determined. Martens hardness (HM) was assessed at baseline and during storage up to 1 month in distilled water (DW), peppermint oil (PO), heptane (HT) and 75% ethanol (ET) for four commercially-available denture teeth; Vivodent (VIV), Double-cross-linked Postaris (DCL), Orthosit (ORT), Candulor porcelain (POR) and two polymer based experimental denture teeth: Experimental 1 (EXP1); a hybrid nanocomposite with two different sized silanated filler particles and Experimental 2 (EXP2); containing an organic copolymer based upon urethanedimethacrylate and polymethyl methacrylate. Hardness [mean (sd)] at baseline was: VIV 142 (1), DCL 142 (1), ORT 209 (9), POR 2926 (101), EXP1 285 (11), and EXP2 146 (12). One-way ANOVA using Tukey's test on polymer-based materials showed that the hardness values of ORT and EXP1 were significantly higher than those of VIV, DCL and EXP2 (P < 0.05). Moreover, EXP1 had a significantly higher hardness value than ORT (P < 0.05). Except for EXP1, all polymer based materials showed a significant drop in hardness after storage in ET (P < 0.05). Specimens stored in water, heptane and peppermint oil showed minor fluctuations in hardness, which were not statistically significant.

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http://dx.doi.org/10.1007/s10856-007-3043-4DOI Listing
August 2007

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J Gerontol A Biol Sci Med Sci 2021 Mar 1. Epub 2021 Mar 1.

Department of Epidemiology, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China.

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J Prosthet Dent 2021 Mar 2. Epub 2021 Mar 2.

Professor of Prosthodontics, Member of Evidence Based Dentistry Center and Head of Fundraising Unit and Central Control Unit, Faculty of Dentistry, Cairo University, Cairo, Egypt. Electronic address:

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J Clin Med 2021 Feb 20;10(4). Epub 2021 Feb 20.

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Department of Health Sciences, School of Medicine, University of Catanzaro "Magna Græcia", Viale Europa, 88100 Catanzaro, Italy.

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Institute of Science and Technology, São Paulo State University (Unesp), São José dos Campos, São Paulo 12220690, Brazil.

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