Fracture resistance of class IV fiber-reinforced composite resin restorations: An in vitro study

• Main Authors: P S Praveen Kumar (Author), K T Srilatha (Author), B Nandlal (Author)
• Format: Book
• Published: Wolters Kluwer Medknow Publications, 2017-01-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.
• Notes: 0976-4003; 10.4103/IJDS.IJDS_96_17
• Keywords: Class IV; fracture resistance; glass fiber-reinforced composite; incisal edge fracture; Dentistry; RK1-715
• Source: Indian Journal of Dental Sciences, Vol 9, Iss 4, Pp 241-244 (2017)

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.