Effect of Intermediate Fiber Layer on the Fracture Load and Failure Mode of Maxillary Incisors Restored with Laminate Veneers

Abstract

This study evaluated the fracture load and failure mode of various veneer materials cemented with or without the addition of a fiber-reinforced composite (FRC) layer at the adhesive interface. Sixty intact incisors were randomly divided into three groups. Group 1 was fabricated with the heat-press technique (IPS Empress 2); Group 2 with the copy milling technique (ZirkonZahn); and Group 3 with the direct or indirect composite technique (Z250) -and specimens were cemented either with or without FRC at the adhesive interface. The specimens were thermocycled and tested with a universal testing machine. No significant differences in fracture load (p>0.05) were found among the various veneer materials. The addition of FRC at the adhesive layer did not lead to significant differences in the fracture load (p>0.05) but resulted in differences in the failure mode. Laminate veneers made of composite, zirconia, and Empress 2 showed comparable mean fracture loads. However, the use of FRC at the interface changed their failure modes.

Effect of fiber-reinforced composites on the failure load and failure mode of composite veneers

“…Previous reports have attributed the complex failure behavior to a change in the interface dynamics, whereby the latter resulted from the fibers added to the tooth-restoration interface 18,29) . The results of the current study were in good agreement with previous reports, which showed changes in failure mode despite the lack of increase in static adhesive strength 18,21,29,30) . Similarly, the final failure loads in the current study were not statistically different among the test groups -however, significant differences were seen in the load-deflection graphs as well as in their failure modes.…”

“…This allowed monomers with the same dissolving parameter as PMMA to diffuse into the polymer matrix. In accordance with a previous report, the failure analysis of the FRC groups confirmed good adhesion between the laminate veneer and the luting agent 30) . Despite occurrences of adhesive failure between the PFC veneer and luting agent, adhesive failures between the FRC and luting agent were not common in this study.…”

“…In other words, the continuous temperature changes did not necessarily create high stresses that impaired the mechanical interlocking of the unidirectional FRC to enamel following the thermocycling procedure 21) . On the use of FRCs, they were purported to act as a crack stopper layer at the adhesive interface 18,30) . To evaluate their efficacy as a crack stopper layer, their initial and final failure loads and failure modes were examined in this study.…”

Effects of fibers on the color change and stability of resin composites after accelerated aging

“…Recent years have seen a dramatic increase in the use of fiber-reinforced composites (FRCs) for chairside periodontal splints 11) , fixed partial dentures 11) , post-core systems 12) , and orthodontic applications 13) . For direct or indirect restorations such as composite inlays 14) and laminate veneers 15) , insertion of an intermediate FRC layer/substructure at the interface was found to reduce microleakage and increase fracture resistance.…”

Evaluation of the Flexural Strength of Submicron Hybrid Composite using Different Fabrication Methods: An in vitro Study

“…Cast was poured using type IV dental die stone. 9,10 Stone dies were carefully separated from the impression and teeth were randomly divided into two subgroups: 1. Group I: Veneers fabricated with light (n = 10) (light-emitting diode light-curing unit) are shown in Figure 2.…”