title: Plaque accumulation on glass ionomer filling materials.
abstract: It has been suggested that fluoride released by glass ionomers inhibits the growth of plaque. The aim of this study was to compare plaque accumulation on glass ionomers and composite. The materials tested were (1) freshly mixed glass ionomer (Ketac-Fil), (2) artificially aged glass ionomer (Ketac-Fil), (3) freshly mixed silver glass ionomer (Ketac-Silver) and (4) light-cured hybrid composite (Valux). Ten volunteers wore an acrylic appliance for three periods of 18 hours, one for each glass ionomer. A glass ionomer disk was inserted on one randomly chosen side of the appliance and the composite disk on the other. The volunteers rinsed once an hour with a 15% sucrose solution. The amount of pellicle and plaque on the disk was estimated by analysing its protein content. During each cycle, more plaque accumulated on the glass ionomers than on the composite (fresh Ketac-Fil/Valux p less than 0.05, aged Ketac-Fil/Valux p less than 0.01, Ketac-Silver/Valux NS). On examination using a scanning electron microscope the surfaces of the glass ionomers were found to be markedly more porous, and to contain more microbes, than the composite surface. The presence of silver in the silver glass ionomers may have affected the initial adherence of bacteria.
authors.affiliation: Faculty of Dentistry, University of Kuopio, Finland.
authors.forename: H
authors.initials: H
authors.lastname: Forss
authors.forename: L
authors.initials: L
authors.lastname: Seppä
authors.forename: P
authors.initials: P
authors.lastname: Alakuijala
mesh_terms: D000328:Adult; D016722:Cermet Cements / Q000737:chemistry; D003188:Composite Resins / Q000737:chemistry*; D003741:Dental Deposits / Q000737:chemistry / Q000209:etiology / Q000473:pathology; D044622:Dental Pellicle; D003773:Dental Plaque / Q000737:chemistry / Q000209:etiology* / Q000473:pathology; D003793:Dental Restoration, Permanent; D005899:Glass Ionomer Cements / Q000737:chemistry*; D006801:Humans; D008298:Maleates / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D011506:Proteins / Q000032:analysis; D012471:Salivary Proteins and Peptides / Q000032:analysis; D013395:Sucrose / Q000494:pharmacology; D013499:Surface Properties
chemical_list: D016722:Cermet Cements; D003188:Composite Resins; D005899:Glass Ionomer Cements; D008298:Maleates; D011506:Proteins; D012471:Salivary Proteins and Peptides; D013395:Sucrose; C040964:Ketac-Fil