title: Effect of acidic food and drinks on surface hardness of enamel, dentine, and tooth-coloured filling materials.
abstract: OBJECTIVE
  The purpose of this study was to determine the effect of acidic food and drinks (Cola soft drink, drinking yogurt, orange juice, sports drink, Tom-yum soup) on surface hardness of various substrates (enamel, dentine, universal composite, microfilled composite, conventional glass ionomer, resin-modified glass ionomer, polyacid-modified resin composite).
  
  
  METHODS
  Specimens (n = 10) were alternately immersed, 5 s each, in food or drinks and in artificial saliva for 10 cycles. Baseline and post-immersion Vickers hardness were compared using paired t-test. The difference in hardness between the groups was analysed with one-way ANOVA followed by a least significant different (LSD) test.
  
  
  RESULTS
  Cola soft drink significantly reduced surface hardness of enamel, dentine, microfilled composite, and resin modified glass ionomer (p < 0.05). Orange juice and sports drink significantly reduced surface hardness of enamel (p < 0.05). Drinking yogurt and Tom-yum soup did not reduce surface hardness of any substrate.
  
  
  CONCLUSIONS
  This in vitro study confirms the erosive potential of certain acidic food and drinks that public should be aware of.
authors.affiliation: Department of Operative Dentistry, Khon Kaen University, Khon Kaen, Thailand.
authors.forename: S
authors.initials: S
authors.lastname: Wongkhantee
authors.forename: V
authors.initials: V
authors.lastname: Patanapiradej
authors.forename: C
authors.initials: C
authors.lastname: Maneenut
authors.forename: D
authors.initials: D
authors.lastname: Tantbirojn
mesh_terms: D000180:Acrylic Resins / Q000737:chemistry; D000704:Analysis of Variance; D001628:Beverages / Q000009:adverse effects*; D002253:Carbonated Beverages / Q000009:adverse effects; D003188:Composite Resins / Q000737:chemistry; D003743:Dental Enamel / Q000737:chemistry / Q000187:drug effects*; D003804:Dentin / Q000737:chemistry / Q000187:drug effects*; D006244:Hardness / Q000187:drug effects; D006245:Hardness Tests; D006801:Humans; D011140:Polyurethanes / Q000737:chemistry; D012822:Silicon Dioxide / Q000737:chemistry; D013499:Surface Properties / Q000187:drug effects; D014077:Tooth Erosion / Q000139:chemically induced; D015014:Yogurt / Q000009:adverse effects
chemical_list: D000180:Acrylic Resins; C029012:Composite Dental Resin; D003188:Composite Resins; D011140:Polyurethanes; C015897:glass ionomer; D012822:Silicon Dioxide