Longevity of bonded composite restorations after dentin biomodification with neolignans obtained from Nectandra leucantha

Objective: This in vitro study evaluated the effect of neolignan-containing solutions on dentin biomodificationpreviously applied to bonding procedure adhesive restorations. Material and Methods: Neolignans,dehydrodieugenol B–CP1 dehydrodieugenol B methyl ether–CP2, were isolated from Nectandra leucanthaand two aqueous containing 0.13% neolignans, 0.2% propylene glycol 3.0% ethanol prepared.Bovine teeth ground flat obtain 2-mm thick specimens which received resin composite restorations(N=10). The neolignan before (60 s). Experimental groups were:control, untreated group, 0.12% chlorhexidine gel, CP1 solution, CP2 solution. A push-outbond strength test was conducted (0.5 mm/min). Bovine tooth sections (0.5×1.7×7.0 mm) also obtained toassess modulus elasticity mass change after treatment (N=15). three-point bending theelastic fully demineralized dentine beams immersion solutions. data statisticallyanalyzed (a = 0.05). Results: bond restorations significantly improved by thetreatment with solutions, irrespective evaluation time (p<0.05). After 6 months, asignificant reduction observed treated (p>0.05), butthe means higher than control elastic demineralizeddentin All lost weight.Conclusion: longevity bonded restorations, possibly due dentinbiomodification neolignans. KEYWORDSDental restorations; Permanent; Dentin; Collagen type I; Plants medicinal; Lignans.