Fracture behaviour patterns of cusp-replacing fibre strengthened composite restorations

Show simple item record Visser, H.J. Brandt, Paul Dieter De Wet, Francois A. 2015-12-08T07:34:11Z 2015-12-08T07:34:11Z 2015-10
dc.description.abstract OBJECTIVES : To investigate and compare, in vitro, the fracture behaviours of three types of cusp-replacing posterior composite resin restorations. METHODS : Standard preparations for posterior composite restoration of the mesio-lingual cusp were cut on seventy- five extracted lower left first and second molars and restorations placed. Group A (control, n =25) with a conventional posterior composite resin, Group B (n=25): resin reinforced with nano-scale electrospun glass fibres Group C (n=25) :resin reinforced with a fibre substructure. Specimens were thermocycled for 500 cycles between 5°C and 55°C with a dwell time of 30 seconds, then embedded in plastic cylinders in acrylic resin. The specimens were loaded in a universal testing machine at a 30° angle to the long axis of the tooth until fracture occurred. Fracture patterns were highlighted by staining, studied under a microscope and classified as favourable (restorable) or unfavourable (non-restorable). Sub-classification included adhesive and cohesive failures. RESULTS : Group C exhibited significantly more “restorable” fractures. Group B displayed significantly more “nonrestorable” fractures. Fracture patterns differed significantly between the two fibre-strengthening techniques. (Fisher’s Exact Test p = 0.05) CLINICAL SIGNIFICANCE : Resin restorations reinforced with glass-fibre substructures are more readily repaired after fracture, saving tooth structure, and reducing costs to the patient. en_ZA
dc.description.librarian am2015 en_ZA
dc.description.uri en_ZA
dc.identifier.citation Visser, HJ, Brandt, PD & De Wet, FA 2015, 'Fracture behaviour patterns of cusp-replacing fibre strengthened composite restorations', South African Dental Journal, vol. 70, no. 9, pp. 390-395. en_ZA
dc.identifier.issn 1029-4864
dc.language.iso en en_ZA
dc.publisher South African Dental Association en_ZA
dc.rights South African Dental Association en_ZA
dc.subject Glass-fibre reinforcement en_ZA
dc.subject Posterior composite resin restorations en_ZA
dc.subject Fracture patterns en_ZA
dc.subject Cemento-enamel junction (CEJ) en_ZA
dc.subject Mesio-occlusal-lingual (MOL) en_ZA
dc.title Fracture behaviour patterns of cusp-replacing fibre strengthened composite restorations en_ZA
dc.type Article en_ZA

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