Open AccessFracture resistance of class IV fiber-reinforced composite resin restorations: An in vitro study
Author(s) -
PS Praveen Kumar,
K T Srilatha,
B Nandlal
Publication year - 2017
Publication title -
indian journal of dental sciences
Language(s) - English
Resource type - Journals
eISSN - 2231-2293
pISSN - 0976-4003
DOI - 10.4103/ijds.ijds_96_17
Subject(s) - cementoenamel junction , materials science , fracture (geology) , composite material , crown (dentistry) , glass fiber , fiber reinforced composite , universal testing machine , composite number , fiber , crosshead , dentistry , molar , medicine , ultimate tensile strength
Objectives: The aim of this study was to evaluate fracture resistance of incisal edge fractures (Class IV) restored with a Glass Fiber-reinforced Composite (FRC). Materials and Methods: Twenty-four extracted sound maxillary central incisors were randomly divided into two groups. Group I (control) contained untreated teeth. Samples in experimental groups II were prepared by cutting the incisal (one-third) part of the crown horizontally and was subjected to enamel preparations, then restored with a Glass FRC. Fracture resistance was evaluated as Newton's for samples tested in a Hounsfield universal testing machine. Failure modes were examined microscopically. Results: Mean peak failure load (Newton's) observed in Glass Fiber-reinforced Nanocomposite was 863.50 ± 76.12. The experimental group showed similar types of failure modes with the majority occurring as cohesive and mixed type. 58% of the teeth in Glass FRC group fractured below the cementoenamel junction. Conclusion: Using Fiber reinforced composite substructure under conventional composites in Class IV restorations, the fracture resistance of the restored incisal edge could be increased