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. 2022 Oct 15;14(20):4339.
doi: 10.3390/polym14204339.

Evaluation of Fracture Strength of Fiber-Reinforced Direct Composite Resin Restorations: An In Vitro Study

Nassreen Hassan Mohammad Albar  1 , Waad Fahmi Khayat  2
Affiliations

Evaluation of Fracture Strength of Fiber-Reinforced Direct Composite Resin Restorations: An In Vitro Study

Nassreen Hassan Mohammad Albar et al. Polymers (Basel). .

Abstract

This in vitro study aimed to compare the fracture strength of direct non-reinforced class II composite resin restorations and polyethylene fiber-reinforced restorations, and also to investigate the influence of the locations of polyethylene fibers within the cavity on the fracture strength. Sixty freshly extracted human teeth were disinfected and prepared (class II cavity design). The teeth were assigned randomly into four groups (n = 13). Group I (control) was restored with nano-hybrid composite resin. The other three experimental groups were restored with the same composite resin material reinforced by polyethylene fibers (Ribbond) at different locations. Fibers were placed either on the axial wall (Group II), on the gingival floor (Group III), or on the axial wall and pulpal/gingival floor (Group IV) of the proximal cavity. All the teeth were subjected to thermocycling to simulate the oral environment. The fracture strength was measured using a universal testing machine. Group IV had the highest mean fracture strength at maximum load (148.74 MPa), followed by Group II (140.73 MPa), Group III (136.34 MPa), and Group I (130.08 MPa), with a statistically significant difference from the control group (p = 0.008) but not between groups II and III.

Keywords: composite resin; fracture strength; polyethylene; ribbond.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Graphical illustration of the study design.
Figure 2
Figure 2
Fracture strength test by universal testing machine using a 3 mm diameter steel ball contacting the restoration at the isthmus area at a crosshead speed of 0.5 mm/min until fracture.
Figure 3
Figure 3
Means of fracture strength and maximum load of each group.
See this image and copyright information in PMC

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