title: Resistance of surface coating resins against toothbrushing abrasion.
abstract: OBJECTIVE
  To evaluate the durability of a resin coating system after toothbrushing abrasion resistance and surface hardness of the coating resin.
  
  
  METHODS
  Rectangular blocks of Top Coat (TC) or the bonding resin of the two-step self-etching adhesive Clearfil SE Bond (SEB) were prepared by irradiation with halogen light units. After immersion in distilled water at 37 degrees C until stabilized water absorption, the specimens were subjected to toothbrushing abrasion tests in which a toothbrush was moved on the specimen at 60 strokes/minute with a 400 gf vertical load with toothpaste slurry. The specimens were weighed after every 10,000 strokes until 200,000 strokes. Hardness of the specimen was measured with a Knoop hardness tester, and the degree of cure was determined using ATR-FTIR spectroscopy. Statistical differences between materials were analyzed using a Student's t-test.
  
  
  RESULTS
  TC demonstrated significantly less weight loss than SEB after 40,000 strokes (P<0.05), showing 0.87 +/- 0.64 mg loss after 200,000 strokes. The Knoop hardness number of TC was significantly greater than that of SEB (P<0.05), and TC presented a greater degree of cure.
authors.affiliation: Hacettepe University, School of Dentistry, Department of Restorative Dentistry, Ankara, Turkey. eneren@hacettepe.edu.tr
authors.forename: Emine Suzan
authors.initials: ES
authors.lastname: Eneren
authors.forename: Satoshi
authors.initials: S
authors.lastname: Imazato
authors.forename: Andrea Viviana
authors.initials: AV
authors.lastname: Kaneshiro
authors.forename: Yukiteru
authors.initials: Y
authors.lastname: Iwami
authors.forename: Shigeyuki
authors.initials: S
authors.lastname: Ebisu
authors.forename: Sevil
authors.initials: S
authors.lastname: Gurgan
mesh_terms: D003188:Composite Resins / Q000627:therapeutic use*; D006244:Hardness; D008422:Materials Testing; D014072:Tooth Abrasion / Q000209:etiology / Q000517:prevention & control*; D014099:Toothbrushing / Q000009:adverse effects*
chemical_list: D003188:Composite Resins