title: Fracture strength of the remaining dental structure after different cavity preparation designs.
abstract: The aim of this in vitro study was to evaluate the loss of tooth structure after cavity preparation for direct (retentive) and indirect (nonretentive) restorations and its relationship to the fracture strength of the prepared tooth. Sound human third molars (60 maxillary and 60 mandibular) were randomly assigned into 12 groups (n = 10) according to the type of cavity preparation and the respective buccolingual width. Class II mesio-occlusodistal cavity preparations, for both indirect inlay and direct resin restorations, were prepared with standardized dimensions of one-half, one-third, or one-quarter of the occlusal intercuspal distance. Fracture resistance was lower and weight loss was greater for all nonretentive preparations. Greater losses in weight and fracture resistance occurred when the buccolingual width for both types of cavities increased, except for the weight loss of the one-quarter and one-third indirect cavity preparations in the mandibular molars, and the fracture resistance of the one-half and one-third direct cavity preparations in maxillary molars. Higher tooth structure loss and lower fracture strength were recorded after preparation of the inlay cavities.
authors.forename: Evisabel Siqueira Simões
authors.initials: ES
authors.lastname: Teixeira
authors.forename: Fabio Antonio Piola
authors.initials: FA
authors.lastname: Rizzante
authors.forename: Sérgio Kiyoshi
authors.initials: SK
authors.lastname: Ishikiriama
authors.forename: José
authors.initials: J
authors.lastname: Mondelli
authors.forename: Adilson Yoshio
authors.initials: AY
authors.lastname: Furuse
authors.forename: Rafael Francisco Lia
authors.initials: RF
authors.lastname: Mondelli
authors.forename: Juliana Fraga Soares
authors.initials: JF
authors.lastname: Bombonatti
mesh_terms: D003737:Dental Cavity Preparation / Q000009:adverse effects / Q000379:methods*; D003799:Dental Stress Analysis; D006801:Humans; D066298:In Vitro Techniques; D008963:Molar / Q000473:pathology / Q000601:surgery*; D014082:Tooth Fractures / Q000209:etiology* / Q000517:prevention & control
keywords: cavity preparation; compression strength; fracture strength