title: Quantification of the configuration factor in Class I and II cavities and simulated cervical erosions.
abstract: The configuration factor of adhesive cavities is defined as the ratio of the restoration's bonded to unbonded (free) surfaces. Such a configuration factor was described, on ideal cavities, as having a potential value in predicting the behaviour of the restorations, because it is related to the restoration's capacity for relieving stress by flow. The aim of this study was to measure the configuration factor value for real Class I and II cavities and simulated cervical erosions prepared in molars. Ten Class I, five Class II cavities and seven cervical erosions were analysed using a computerised digitising system. The configuration factor values found were 4.03 +/- 0.33 for Class I cavities, 1.85 +/- 0.59 for Class II cavities and 1.10 +/- 0.09 for simulated cervical erosions (P < 0.01).
authors.affiliation: Departamento Odontologia Conservadora, Facultad de Odontologia, Universidad Complutense, Madrid, Spain.
authors.forename: J C
authors.initials: JC
authors.lastname: de la Macorra
authors.forename: S
authors.initials: S
authors.lastname: Gomez-Fernandez
mesh_terms: D003188:Composite Resins / Q000737:chemistry; D003737:Dental Cavity Preparation / Q000379:methods*; D003793:Dental Restoration, Permanent; D006801:Humans; D007284:Inlays; D008963:Molar; D010361:Patients; D019279:Resin Cements / Q000737:chemistry; D019237:Tooth Cervix; D014077:Tooth Erosion / Q000628:therapy*
chemical_list: D003188:Composite Resins; D019279:Resin Cements