title: Tunnel restorations using glass ionomer or glass cermet: in vitro marginal ridge fracture and microleakage.
abstract: The purpose of this in vitro study was to compare the marginal ridge fracture resistance and microleakage following restorations of partial tunnel preparations using glass ionomer and glass cermet cements. Sixty eight sound premolars were selected for this study and were divided randomly into six groups. A standardized partial tunnel preparation was done on all the teeth except specimens belonging to Group I. The partial tunnel preparations of Groups III & V were restored with glass ionomer and that of Groups IV & VI were restored with glass cermet. The teeth belonging to Groups I, II, III & IV were subjected to marginal ridge fracture resistance testing. The teeth of Groups V & VI were tested for microleakage after immersing them in 5% methylene blue solution for 4 hours. The results indicated that the teeth restored with glass cermet were marginally better than that with glass ionomer in terms of marginal ridge fracture resistance. Both the materials failed to reinforce the marginal ridge to the level of an intact tooth. The microleakage which occurred around both the materials were statistically insignificant, but on comparison glass ionomer showed better results. Hence, glass ionomer is preferred as a restorative material for partial tunnel preparations because of additional inherent advantages like superior esthetics and fluoride leachability.
authors.affiliation: Department of Pedodontics and Preventive Dentistry, A.B. Shetty Memorial Institute of Dental Sciences, Mangalore, Karnataka, India.
authors.forename: R
authors.initials: R
authors.lastname: Shetty
authors.forename: A K
authors.initials: AK
authors.lastname: Munshi
mesh_terms: D001641:Bicuspid; D016722:Cermet Cements; D003737:Dental Cavity Preparation / Q000379:methods; D003763:Dental Leakage; D018772:Dental Marginal Adaptation; D003793:Dental Restoration, Permanent / Q000379:methods*; D003799:Dental Stress Analysis; D005899:Glass Ionomer Cements; D006801:Humans; D008422:Materials Testing; D008751:Methylene Blue; D018030:Silver Compounds; D018709:Statistics, Nonparametric
chemical_list: D016722:Cermet Cements; D005899:Glass Ionomer Cements; D018030:Silver Compounds; C067445:Chelon Silver; C084541:Fuji glass-ionomer lining cement; D008751:Methylene Blue