title: Repeated exposure of acidic beverages on esthetic restorative materials: An in-vitro surface microhardness study.
abstract: BACKGROUND
  A manifold increase in the consumption of aerated beverages has witnessed a twin increase in tooth wear and raised demand for esthetic restorative materials. This study aimed to evaluate the surface microhardness changes of esthetic restorative materials following treatment with aerated beverages in an in-vitro situation.
  
  
  METHODS
  The initial surface microhardness of the restorative materials GC Fuji II LC, GC Fuji IX, Nano Glass ionomer, Resin and Nano composite was recorded. These materials were studied under 3 groups that included those exposed to the acidic beverages daily, weekly once in a month and those that had no exposures at all. The final surface microhardness of the materials was recorded following experimentation and was subjected to statistical comparisons.
  
  
  RESULTS
  The restorative materials were compared for their surface microhardness changes following respective treatments using the T-test and One-way ANOVA analysis. Inter-comparisons between the groups showed statistical significance (p<.05), when treated with both the beverages. The five restorative materials revealed surface microhardness loss; the maximum reduction noticed with the Nano glass ionomer cement tested (p<.0005).
  
  
  CONCLUSIONS
  The surface microhardness of restorative materials markedly reduced upon repeated exposures with acidic beverages; the product with phosphoric acid producing the maximum surface microhardness loss.
  
  
  BACKGROUND
  Restorative materials, acidic beverages, surface microhardness, resin composites, glass ionomers.
authors.affiliation: Reader. Department of Pediatric dentistry, Amrita School of Dentistry, Amrita Vishwa Vidyapeetham, Cochin - 41, India.
authors.forename: Arun M
authors.initials: AM
authors.lastname: Xavier
authors.affiliation: Chief Dental Surgeon. Smile n Care Multispeciality & Pediatric Dental Home, Aluva, Kerala, India.
authors.forename: Steffy M
authors.initials: SM
authors.lastname: Sunny
authors.affiliation: Professor & Head of Department. Dept of Pedodontics and Preventive Dentistry, Bangalore Institute of Dental Sciences, Wilson Garden, Hosur main road, Lakksandra, Bangalore, 560029, India.
authors.forename: Kavita
authors.initials: K
authors.lastname: Rai
authors.affiliation: Senior Professor & Head. Department of Pedodontics and Preventive Children Dentistry, A.B. Shetty Memorial Institute of Dental Sciences, Mangalore 18, India.
authors.forename: Amitha M
authors.initials: AM
authors.lastname: Hegde