OBJECTIVES Nanofilled composite resins are claimed to provide superior mechanical properties compared with microhybrid resins. Thus, the aim of this study was to compare nanofilled with microhybrid composite resins. The null hypothesis was that the size and the distribution of fillers do not influence the mechanical properties of surface roughness and wear after simulated toothbrushing test. ...

Concern has been raised about the bonding of restorative procedures to an erosive lesion, given the change in organic and inorganic composition and structure of this substrate. This in vitro study evaluated the effect of erosive drinks and an enzyme inhibitor (2% chlorhexidine digluconate - 2% CHX) on bond strength to dentin. Sixty sound human third molars were selected, and the occlusal enamel...

objective: the aim of this study was to compare the microtensile bond strengths (μ tbs) of three core materials with one lithium disilicate reinforced ceramic using two resin cements. methods: three core materials (nulite f® (biodental technologies), filtek z250® (3m-espe), prettau-anterior® (zirkonzhan, germany)) were prepared as blocks (10×10×4 mm3) according to the manufacturer’s instruction...

Abstract The aim was to evaluate the effect of different antioxidant agents on improvement bond strength enamel subjected a whitening procedure. Samples were divided into six groups ( n = 10): control; immediately followed by restorative treatment (WHT); and restoration after 7-day period (WHT_7D); application 10% sodium ascorbate (WHT_SA); 5% grape seed extract (WHT_GS); green tea (WHT_GT). Al...

Background he need of delimiting the bonding area on microshear bond strength (µSBS) test remains an unclear issue. In addition, there are different types tube to perform resin composite cylinders µSBS test. The aim this study was evaluate influence adhesive delimitation and type used build up specimens for testing systems, enamel dentin. Methods 120 bovine incisors were ground achieve flat buc...

Introduction: Mouthwashes which prevent and control caries and periodontal diseases are commonly used even without professional pre‌scription. Long-term use of mouth-washes may cause softening of restorative composites and lowering the longevity of restoration. The aim of this study was evaluation of surface hardness value of a microhybride composite (Filtek Z250) after 12 hours immersion in th...

The aim of this study was to evaluate the shear bond strength (SBS) of polycrystalline ceramic brackets (PCB) bonded after bleaching treatment using different composite resins and enamel etching times. A total of 144 bovine incisors were randomly divided into two study groups (n = 72, each) as follows: G1, enamel bleached with 35% hydrogen peroxide, and G2 (control group), enamel unbleached. Af...

OBJECTIVE To evaluate the effects of strain rate and temperature on the mechanical properties of resin composite restorative materials (RCs) and to investigate the construction of temperature--strain rate equivalence 'master curves'. METHODS Four visible light-cured resin composite RCs, all of shade A3, were used: Heliomolar Radiopaque (HR) and Tetric Ceram (TC) (Ivoclar, Schaan, Liechtenstei...

objectives: to assess the effect of lactic acid (la) on microleakage of silorane-based composite restorations and methacrylate-based composites with self-etch and etch-and-rinse bonding systems. materials and methods: class v cavities were prepared in 120 extracted human teeth, divided into four groups and restored as follows: 1. silorane-based composite+p90 adhesive system (p90); 2. filtek z25...

Objective: The aim was to evaluate the influence of fluoride-releasing restorative materials in enamel and dentinmicrohardness. Material Methods: 40 blocks (5x5x3 mm) from cervical third human molars received a cavitypreparation between dentin, restorations were subjected vitro caries model. Specimenswere randomly restored with (n=10): conventional glass ionomer cement (Ketac Cem, 3M ESPE); pol...