title: Removal of amalgam, glass-ionomer cement and compomer restorations: changes in cavity dimensions and duration of the procedure.
abstract: This study investigated changes in the dimensions of Class II cavities following the removal of amalgam, glass ionomer and compomer restorations. In 30 extracted caries-free human molars, preparation for 60 mesio-occlusal and occluso-distal cavities (two cavities per tooth) occurred. With a CEREC 3 laser triangulation sensor and software-based construction analysis, the dimensions of the cavities at seven defined sites were measured. The cavities were randomized into four groups. Group 1 was restored with Ketac-Fil glass-ionomer cement, Group 2 with amalgam and Group 3 with Compoglass F compomer. In Group 4, Compoglass F was used in combination with photochromic Tetric Flow Chroma as a cavity liner. The completed restorations were then removed using 2x magnification and the cavities were once again controlled using the laser system. The duration of the removal procedure was also recorded. Changes in cavity dimensions (depth, height and width) following removal of the restorations were significantly smaller in Groups 1 and 2. Groups 3 and 4 were characterized by a significant overextension of the cavities compared to Groups 1 and 2 in all three dimensions. Group 4, with Tetric Flow Chroma as a cavity liner, showed better results than Group 3, but this improvement was not statistically significant. The duration of the removal procedure was significantly shorter in Group 2 than in the other groups.
authors.affiliation: Department of Restorative Dentistry, Johann Wolfgang Goethe University of Frankfurt, Germany. S.Szep@em.uni-frankfurt.de
authors.forename: Susanne
authors.initials: S
authors.lastname: Szep
authors.forename: C
authors.initials: C
authors.lastname: Baum
authors.forename: C
authors.initials: C
authors.lastname: Alamouti
authors.forename: D
authors.initials: D
authors.lastname: Schmidt
authors.forename: T
authors.initials: T
authors.lastname: Gerhardt
authors.forename: D
authors.initials: D
authors.lastname: Heidemann
mesh_terms: D020770:Compomers; D003188:Composite Resins; D003723:Dental Amalgam; D003736:Dental Cavity Lining; D003737:Dental Cavity Preparation; D003793:Dental Restoration, Permanent / Q000379:methods*; D005899:Glass Ionomer Cements; D006801:Humans; D007834:Lasers; D008298:Maleates; D008963:Molar; D019233:Retreatment
chemical_list: C105428:Compoglass; D020770:Compomers; D003188:Composite Resins; D005899:Glass Ionomer Cements; D008298:Maleates; C452226:tetric flow composite resin; D003723:Dental Amalgam; C040964:Ketac-Fil