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|Title:||Effects of pH on the microhardness of resin-based restorative materials||Authors:||Mohamed-Tahir, M.A.
|Issue Date:||Sep-2005||Citation:||Mohamed-Tahir, M.A.,Tan, H.Y.,Woo, A.A.S.,Yap, A.U.J. (2005-09). Effects of pH on the microhardness of resin-based restorative materials. Operative Dentistry 30 (5) : 661-666. ScholarBank@NUS Repository.||Abstract:||This study determined the effect of pH on the microhardness of commonly used resin-based restorative materials which included a resin composite (Esthet-X, Dentsply), a new generation compomer (Dyract Extra, Dentsply) and a giomer (Beautifil, Shofu). Fifty-four specimens (3-mm wide x 3-mm long x 2-mm deep) were made for each material. The specimens were divided into six equal groups and conditioned in the following solutions at 37°C for one week: 0.3% citric acid at pH 2.5, sodium hydroxide - buffered citric acid at pH 3, 4, 5, 6 and 7. After conditioning, the specimens were subjected to hardness testing using a digital microhardness tester (load 500gf; dwell time 15 seconds). Data was analyzed using one-way ANOVA and Scheffe's test at a significance level of 0.05. The effects of pH on the microhardness of resin-based restoratives were material dependent. The compomer and giomer materials were more affected by acids of low pH than the composite material that was evaluated. ©Operative Dentistry, 2005.||Source Title:||Operative Dentistry||URI:||http://scholarbank.nus.edu.sg/handle/10635/79897||ISSN:||03617734|
|Appears in Collections:||Staff Publications|
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