title: In vitro marginal microleakage: examination of measurements used in assessment.
abstract: Premolar teeth with Class II amalgam restorations placed after the application of cavity varnish (Group A), a light cured glass ionomer base (Group B) and 40 per cent polyacrylic acid as a pretreatment agent, followed by unset cermet cement (Group C) were examined for marginal leakage using dye penetration and image analysis. Including amongst the parameters examined were linear leakage length and leakage area, which were found to have no consistent correlation. Group A and C did not generally show significant differences in the parameters examined, whereas Group B exhibited significantly less linear leakage (P less than 0.001), and significantly less leakage area when the stained area was expressed as a percentage of available dentine (P less than 0.001). While allowing some linear leakage, it was found that the light cured glass ionomer base appeared to prevent the dye from entering the dentine. It is concluded that an assessment based solely on the leakage length is inadequate and that some measurement of penetration into dentine should be included in order to fully assess the microleakage potential of a material or technique.
authors.affiliation: Department of Restorative Dentistry, University of Leeds, Leeds Dental School, UK.
authors.forename: C C
authors.initials: CC
authors.lastname: Youngson
authors.forename: N J
authors.initials: NJ
authors.lastname: Grey
authors.forename: J G
authors.initials: JG
authors.lastname: Jones
mesh_terms: D000134:Acid Etching, Dental; D016722:Cermet Cements; D004396:Coloring Agents; D003300:Copper; D003722:Dental Alloys; D003723:Dental Amalgam; D003736:Dental Cavity Lining / Q000009:adverse effects; D003743:Dental Enamel; D003763:Dental Leakage / Q000175:diagnosis*; D003764:Dental Materials; D003793:Dental Restoration, Permanent / Q000009:adverse effects; D003804:Dentin; D005899:Glass Ionomer Cements; D006801:Humans; D012116:Resins, Plant; D012834:Silver; D013499:Surface Properties
chemical_list: D016722:Cermet Cements; D004396:Coloring Agents; D003722:Dental Alloys; D003764:Dental Materials; D005899:Glass Ionomer Cements; D012116:Resins, Plant; D012834:Silver; D003300:Copper; D003723:Dental Amalgam; C047093:ANA 2000; C041292:copal rosin varnish