Korean J Dent Mater.  2019 Jun;46(2):53-60. 10.14815/kjdm.2019.46.2.53.

Effect of pH variation on flexural and compressive properties of composite resins

Affiliations
  • 1Department of Oral Biochemistry, School of Dentistry, Pusan National University, Pusan, Korea.
  • 2Department of Dental Materials, School of Dentistry, Pusan National University, Pusan, Korea. y0k0916@pusan.ac.kr

Abstract

The pH of the oral cavity can dynamically change due to diverse foods and beverages served. The purpose of the present study was to evaluate flexural and compressive properties of composite resins after immersion in solutions of different pHs. Four composite resins were cured and immersed in test solutions of different pHs (3, 7.1, and 9) for 2 weeks. Flexural and compressive properties (strength and modulus) were evaluated using universal test machine. After immersion, initial flexural and compressive strength significantly changed to 1.5-30.0% and 0.3-19.6%, respectively; flexural and compressive modulus significantly changed to 4.4-29.0% and 3.5-21.5%, respectively. However, the values obtained from solutions of different pHs were not significantly and consistently different to each other.

Keyword

Composite resin; pH; Flexural property; Compressive property
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