title: Fracture strength of composite fixed partial denture using bovine teeth as a substitute for human teeth with or without fiber-reinforcement.
abstract: This study evaluate the use of bovine teeth as a substitute for human teeth on fracture strength tests of composite fixed partial dentures (Cpd), with and without fiberglass reinforcement (Fg). Eighty teeth were selected, being 40 bovine incisors, 20 human premolars and 20 molars. Bovine incisors were ground to get a platform, simulating an occlusal surface of human molar. Teeth in pairs were embedded in polystyrene resin, simulating the periodontal ligament and divided in 4 groups: B-Cpd-Fg: bovine teeth restored with Cpd with Fg; B-Cpd-NFg: bovine teeth restored with Cpd without Fg; H-Cpd-Fg: human teeth restored Cpd with Fg; and H-Cpd-NFg: human teeth restored with Cpd without Fg. The Cpd were adhesively fixed and submitted to an axial compression load at the pontic center with a crosshead speed of 0.5 mm/min until fracture. Failure modes were assessed and classified. Data were subjected to two-way ANOVA and Tukey's HSD test (α=0.05). The tooth type had no influence on fracture strength and fracture mode. The inclusion of fiberglass increased significantly the fracture strength. The failure modes were more reparable in groups with fiber-reinforcement. Bovine teeth can be used as a substitute for human teeth in these types of fracture strength tests.
authors.affiliation: Department of Operative Dentistry and Dental Materials, Federal University of Uberlândia, MG, Brazil. carlosjsoares@umuarama.ufu.br
authors.forename: Carlos José
authors.initials: CJ
authors.lastname: Soares
authors.forename: Liliane Minglini
authors.initials: LM
authors.lastname: Barbosa
authors.forename: Fernanda Ribeiro
authors.initials: FR
authors.lastname: Santana
authors.forename: Priscilla Barbosa Ferreira
authors.initials: PB
authors.lastname: Soares
authors.forename: Adérito Soares da
authors.initials: AS
authors.lastname: Mota
authors.forename: Gisele Rodrigues da
authors.initials: GR
authors.lastname: Silva
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D002417:Cattle; D019245:Compressive Strength; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis / Q000295:instrumentation / Q000379:methods*; D003819:Denture Bases; D003779:Denture Design; D016379:Denture, Partial, Fixed, Resin-Bonded; D005898:Glass; D006801:Humans; D018709:Statistics, Nonparametric
chemical_list: C009753:fiberglass