title: Glass ionomers and discoloration: a comparative study of the effects of tea and coffee on three brands of glass ionomer dental cement.
abstract: This study was undertaken to compare the in vitro discoloration of 3 brands of glass ionomer dental cement, Chemfil, Fuji Type II, and Ketac-Fil. Forty-eight specimens of each brand were prepared. Sixteen specimens of each brand were placed in tea, coffee and, as a control, water. Discoloration was evaluated by means of reflection spectrophotometry at 2, 4, 8, and 16 wk. Analysis of the data indicated that most discoloration occurred during the first 2 wk of immersion in the staining media and a little further discoloration took place between 2 and 16 wk (p less than 0.05). Tea discoloured glass ionomer more than did coffee (p less than 0.05) and Fuji Type II discoloured the most, Ketac-Fil the least whilst the discoloration of Chemfil lay between these two (p less than 0.05).
authors.forename: M
authors.initials: M
authors.lastname: Rosen
authors.forename: A
authors.initials: A
authors.lastname: Christelis
authors.forename: P
authors.initials: P
authors.lastname: Bow
authors.forename: J
authors.initials: J
authors.lastname: Cohen
authors.forename: P J
authors.initials: PJ
authors.lastname: Becker
mesh_terms: D003069:Coffee / Q000009:adverse effects*; D003738:Dental Cements; D005899:Glass Ionomer Cements; D013662:Tea / Q000009:adverse effects*
chemical_list: D003069:Coffee; D003738:Dental Cements; D005899:Glass Ionomer Cements; D013662:Tea