The influence of different fiber-reinforced composites on shear bond strengths when bonded to enamel and dentin structures

Abstract

Background/purpose: The aim of this study was to evaluate the effect of different fiber-reinforced composites (FRCs) on the shear bond strength of composites bonded to tooth structures. Materials and methods: One hundred human non-carious upper central incisors were used. The FRC test specimens consisted of 4 commercially available polyethylene fiber products (Ribbond, Construct (CT), glass-fiber everStick (ES), and Stick, and one nanohybrid composite (Grandio), bonded to the vestibular surface of adhesive-treated enamel and dentin. Control groups were prepared using the nanohybrid composite along without fiber reinforcement. Specimens were stored wet for 24 hours at 37 C and thermocycled 5000 times between 5 and 55 C. Then, the shear bond strength (SBS) was determined using a universal test machine (Instron) at a crosshead speed of 0.5 mm/min. The failure patterns of the debonded specimens were evaluated using a stereoelectron microscope. Scanning electron microscopy (SEM) was used to assess the fiber resin interface of representative samples. SBS data were analyzed using analysis of variance (ANOVA) and Duncan's test (a Z 0.05). Results: SBS data ranged 21.54e40.18 MPa for the enamel substrates and 20.83e36.87 MPa for the dentin substrates. The one-way ANOVA results revealed statistically significant differences between the shear bond strengths of the experimental and control groups (P < 0.001). Two-way ANOVA of the experimental groups demonstrated statistically significant differences in SBSs between different fiber types and substrates (P < 0.05). A typical SEM micrograph of the surface of the fractured specimens following the shear bond test exhibited no evidence of debonding between the fiber and matrix when using the CT and ES fibers. The SEM analysis revealed that Stick fiber reinforcement contained some air voids in the final FRC structure.

Stress Analysis on Mesiolingual Cavity of Endodontically Treated Molar Restored Using Bidirectional Fiber-Reinforced Composite (Wallpapering Technique)

“…FRC had an elastic modulus similar to dentin and showed lower failure and improved success. 24 Enamel bonding failure was seen in all models except ECC under vertical force and on PCC, ECC under oblique forces (Table 9). FRC used e-glass fiber which showed failure on the enamel and dentin.…”

“…Dentin -E-glass fiber 23 27.9 MPa Shear bond strength Dentin -polyethylene fiber 24 25.92 MPa Dentin -E-glass fiber 24 28.05 MPa Enamel -polyethylene fiber 24 29.08 MPa…”

“…Enamel -E-glass fiber 24 39.87 MPa by the color spectrum of red, orange, yellow, green, and blue. Each color spectrum represents a stress value, which is positive for tensile stress (red color) and negative for compressive stress (blue color).…”

Temperature changes caused by light curing of fiber-reinforced composite resins

“…They also have many other advantages over metal, including ease of repair, non-corrosiveness, translucency and good bonding properties. [ 10 ] Different practical solutions are possible for creating the composite and the fiber; the clinician may adapt the restorative technique to accommodate specific indications and obtain improved results with ease and reliability. [ 10 ] Their applications in diverse areas of dentistry includes chair-side periodontal splinting, orthodontic applications, the manufacture of laboratory-made single crowns, partial- or full-coverage fixed partial dentures, post-core systems, adhesive fixed partial dentures and trauma stabilization.…”

“…[ 10 ] Different practical solutions are possible for creating the composite and the fiber; the clinician may adapt the restorative technique to accommodate specific indications and obtain improved results with ease and reliability. [ 10 ] Their applications in diverse areas of dentistry includes chair-side periodontal splinting, orthodontic applications, the manufacture of laboratory-made single crowns, partial- or full-coverage fixed partial dentures, post-core systems, adhesive fixed partial dentures and trauma stabilization. [ 11 12 13 14 ] Temperature rise in FRC materials must be considered because fibers have a different structure to that of composite materials.…”