title: Fracture resistance of endodontically treated premolars with fibre-reinforced composite restorations.
abstract: This study investigated the fracture resistance and failure mode of endodontically treated premolars restored with a glass fibre-reinforced composite resin. Endodontically treated maxillary premolars were divided in 4 groups: group O: occlusal access opening restored with direct composite; group O+: as group O but with fibre reinforcement; group MOD: occlusal access opening and mesio-distal (MOD) cavity restored with direct composite; group MOD+: as group MOD but with additional fibre reinforcement. Pairwise comparisons of the fracture force among all groups was performed (95% confidence level). Fractures were classified in 4 groups depending on the type of fracture. Group O was the strongest (452.7N) and group MOD the weakest (292.4N). Fracture resistance was significantly different among all groups, except between groups O+ and MOD+. The majority of the unreinforced teeth displayed unfavourable fractures, while the reinforced teeth displayed more favourable fractures. The incorporation of glass fibre weakened endodontically treated but otherwise intact premolars; premolars with MOD restorations were stronger if reinforced with fibres. Fibre reinforcement led to more favourable fractures.
authors.affiliation: Department of Restorative Dentistry, Faculty of Dentistry, University of the Western Cape, Tygerberg, RSA. ggeerts@uwc.ac.za
authors.forename: Greta
authors.initials: G
authors.lastname: Geerts
authors.forename: Etienne
authors.initials: E
authors.lastname: Pitout
authors.forename: Herklaas
authors.initials: H
authors.lastname: Visser
mesh_terms: D001641:Bicuspid; D003188:Composite Resins; D003799:Dental Stress Analysis; D005898:Glass; D006801:Humans; D011176:Post and Core Technique; D014082:Tooth Fractures / Q000517:prevention & control*; D019553:Tooth, Nonvital
chemical_list: D003188:Composite Resins; C009753:fiberglass