title: Effectiveness and efficiency of chemomechanical carious dentin removal.
abstract: The aims of this in vitro study were both to determine the time necessary for removal of carious dentin (efficiency) and the Knoop Hardness Number (KHN) of the remaining dentin (effectiveness), using a chemomechanical method (Carisolv) or hand excavation. Thirty human molars were bisected through occlusal carious lesions into two equal halves. Each half was randomly excavated by hand in circular movements with a spoon excavator or using Carisolv gel according to the manufacturer's instructions. The duration of carious dentin removal was recorded. Tooth sections were resin-embedded, ground flat and polished. Dentin KHN was determined at distances of 100, 200, 300, 400 and 500 microm from the cavity floor. Data were analyzed by Wilcoxon's test (alpha= 0.01), ANOVA and Student's t test (alpha= 0.05). The median of the time necessary for chemomechanical excavation was significantly greater than for hand excavation. KHN means (+/- SD) at 100, 200, 300, 400, 500 microm for chemomechanical method were, respectively: 15.6 (+/- 4.96), 18.0 (+/- 6.22), 21.3 (+/- 9.30), 24.3 (+/- 9.25), 28.5 (+/- 11.80); and for hand excavation were: 21.2 (+/- 10.26), 23.4 (+/- 9.49), 28.2 (+/- 11.62), 31.0 (+/- 12.17), 34.3 (+/- 11.95). It may be concluded that hand excavation presented higher efficiency and effectiveness than chemomechanical excavation.
authors.affiliation: Departament of Restorative Dentistry, Faculty of Dentistry, Federal University of Minas Gerais, Belo Horizonte, MG, Brazil. silamics@yahoo.com
authors.forename: Cláudia Silami de
authors.initials: CS
authors.lastname: Magalhães
authors.forename: Allyson Nogueira
authors.initials: AN
authors.lastname: Moreira
authors.forename: Wagner Reis da Costa
authors.initials: WR
authors.lastname: Campos
authors.forename: Fernanda Magalhães
authors.initials: FM
authors.lastname: Rossi
authors.forename: Guilherme Augusto Alcaraz
authors.initials: GA
authors.lastname: Castilho
authors.forename: Raquel Conceição
authors.initials: RC
authors.lastname: Ferreira
mesh_terms: D000704:Analysis of Variance; D003731:Dental Caries / Q000188:drug therapy / Q000628:therapy*; D003804:Dentin / Q000737:chemistry / Q000187:drug effects; D006244:Hardness / Q000187:drug effects; D006801:Humans; D018709:Statistics, Nonparametric; D013997:Time Factors