statement of problem: despite the increasing demand for tooth-colored restorations in dentistry, polymerization shrinkage and marginal microleakage still remains a problem. objectives: the purpose of the present study was to evaluate microleakage in three different resin composites, p90, z250 and z250 xt, in class v cavity of permanent human premolars. materials and methods: standardized class ...

the aim of this study was to assess the effect of bleaching on elution of monomers from nanofilled and microhybrid composites.80 samples (5mm diameter and 3mm thickness) of each composite were prepared. after curing, half of them were randomly polished. each group was divided into 8 subgroups and immersed in water or 10%, 20% and 30% h2o2 for 3 or 8 hours. eluted bis-gma (bis-phenol a glycidyl ...

Objectives: The aim of this in-vitro study is to investigate discoloration the composite resins with different characteristics which were colored by immersing in coffee, kept mouthwashes and without hydrogen peroxide. Materials Methods: In study, 18 samples (6 mm x 2 mm) pre-heated bulk-fill (Viscalor Bulk -(VIS)), dual-cured (Fill Up!-(FUP)) a microhybrid resin (G-aenial posterior-(GCP)) prepa...

The long-term success of a composite restoration largely depends on its smoothness, which can be achieved by the appropriate polishing tools and material selection. purpose this study was to evaluate surface roughness two materials after application selected systems. Filtek Ultimate (FU) Z250 (FZ) were tested. Forty specimens each prepared. After polymerization under Mylar strip, five samples f...

This article presents new modifications to the clinical technique of fabricating directly applied resin-bonded fibre-reinforced bridges. Torsional and flexural strength is achieved by means of a reinforced polyethylene fibre ribbon substructure surrounded by laminated layers of microhybrid and microfilled resins. The modifications provide a simple method for creating a better pontic-ridge relat...

well. The microhybrid and nanofill composites that have been developed in the last 20 to 25 years are critical for the success of transitional bonding. Handling properties that allow for placement, sculpting, curing on demand, contouring, and polishing allow these restorations to mimic natural tooth structure. In the last few years the advantages of increasing VDO for patients who have lost som...