title: An in vitro assessment of cavity margin finishing and marginal adaptation of tunnel restorations.
abstract: Reasons for the failure of tunnel restorations include fracture of weak carious enamel at the cavity margins, poor adaptation of the restoration approximally, incomplete removal of caries and fracture of the marginal ridge. Four methods of cavity margin finishing were investigated. A round steel bur in a slow handpiece was found to give the best finish. Four materials were used for the restoration of tunnel cavities. In this study posterior resin composite gave the best marginal adaptation; however, a glass ionomer (polyalkenoate) may be preferable as it is impossible to guarantee removal of all carious tooth tissue from these preparations and glass ionomers have the benefit of fluoride release.
authors.affiliation: Unit of Conservative Dentistry, The Dental School, Birmingham, UK.
authors.forename: S A
authors.initials: SA
authors.lastname: Chalker
authors.forename: P J
authors.initials: PJ
authors.lastname: Lumley
mesh_terms: D016722:Cermet Cements; D016009:Chi-Square Distribution; D003188:Composite Resins; D003722:Dental Alloys; D003723:Dental Amalgam; D003737:Dental Cavity Preparation / Q000295:instrumentation / Q000379:methods*; D003793:Dental Restoration, Permanent / Q000379:methods*; D005899:Glass Ionomer Cements; D006801:Humans; D015588:Observer Variation; D012823:Silicate Cement; D013499:Surface Properties; D014520:Urethane
chemical_list: D016722:Cermet Cements; D003188:Composite Resins; D003722:Dental Alloys; D005899:Glass Ionomer Cements; C054101:ChemFil II; C056413:Occlusin; D012823:Silicate Cement; D014520:Urethane; C036886:tytin; D003723:Dental Amalgam