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

Abstract

This study compared the initial and final failure loads and failure modes of indirect resin composite laminate veneers with and without fiber reinforcement. Forty intact lower canines received standard laminate preparations and were randomly assigned into four test groups (n=10). In Group 1, indirect resin composite veneers were repaired with two layers of preimpregnated bidirectional glass fiber weave and a restorative composite; in Group 2, with a layer of preimpregnated unidirectional glass fibers and a restorative composite; and in Group 3, with an experimental semi-IPN matrix composed of multidirectional short glass fibers. Indirect resin composite veneers without any fiber reinforcement were used as control (Group 4). All specimens were thermocycled and tested with a universal testing machine. On the final failure load, there were no statistically significant differences (p>0.05) among the test groups. Within each group, pairwise comparison of initial and final failure loads revealed statistically significant differences (p<0.05), except for Group 4 (p>0.05). On failure mode, unreinforced specimens showed instantaneous failure, whereas reinforced specimens mostly demonstrated elongated failure.

Fracture of fiber-reinforced composites analyzed <i>via</i> acoustic emission

“…This decreases the energy of the final failure, making the final failure less catastrophic in the form of localized chippings and limited fractures. Therefore, fibers convert the fracture mode of composites from an instantaneous occurrence to an extended process 12) . From a clinical point of view, keeping the fractured pieces linked together may prevent swallowing or aspiration of the displaced pieces.…”

“…Furthermore, the use of fibers to reinforce interpenetrating polymer network (IPN) matrices produces highly viscous matrices with improved handling and bonding properties. These properties provide high-quality dental FRC restorations and extend their lifespan with enhanced mechanical properties 10,11) , enabling a gradual rather than instantaneous failure during their clinical use 12) . Fracture occurs when a particular stress limit is exceeded.…”

Bonding of self-adhesive resin cements to enamel using different surface treatments: bond strength and etching pattern evaluations

“…In accordance with the minimal intervention principle, the use of enamel adhesive techniques has greatly increased in dentistry in recent years, with many innovative applications being found in prosthodontics such as veneers and resin-bonded fixed partial dentures 2,3) . An apparent advantage of applying enamel adhesive techniques to these prosthodontic restorations is the preservation of dental hard tissues.…”

Direkt restauratív technikák összehasonlítása MOD kavitással rendelkező fogakban üvegszálas anyagok felhasználásával – előzetes tanulmány

“…Vizsgálatunkban egy üvegszálas hálót használtunk (Everstick NET, GC Europe, Leuven, Belgium), melyet a kavitásokban csoportonként eltérően pozícionálva próbáltuk minél hatékonyabban megerősíteni a direkt restaurátumot és a fogat. Turkaslan és munkatársai megállapították, hogy egy előimpregnált üvegszálas háló a fogakat két iránynyal szemben képes megerősíteni, illetve képes megállítani a repedések terjedését [31]. Az irodalomban eddig restauratív célokra az Everstick NET-et csak indirekt restaurátum (endokorona, héj) alá használták [24,32], viszont poszterior kavitásokban direkt restauratív célokra még nem.…”