OBJECTIVES The aim of this study was to assess the effect of 30% hydrogen peroxide on the microleakage of class V cavities restored with either a silorane-based composite or two methacrylate-based composites. MATERIALS AND METHODS A total of 96 standard class V cavities (1.5 × 2 × 3 mm) were prepared on the buccal surface of sound extracted human premolars with both enamel and dentin margins ...

The aim of this study was to evaluate in vitro the marginal microleakage of different materials used as pit-and-fissure sealants (Delton, Filtek Flow, Dyract Flow and Vitremer). Fifty-six extracted sound human third molars were randomly assigned to 4 groups (n=14). After sealant placement, the teeth were thermocycled (500 cycles; 5 degrees C, 37 degrees C and 55 degrees C), isolated, immersed i...

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 ...

Objective: To evaluate the influence of in-office bleaching on color stability dental restorative materials. Materials and Methods: Forty five discs (n = 15) measure 10 mm in diameter 2 thick were prepared from nanofil composite (Filtek Z350, shade A2). Specimens bleached as follow group A (Opalescence Boost), B (Philips dash), C Zoom) according to manufacturer’s instructions. The Commission In...

objectives: dental composite wear in posterior restorations is a concern and is affected by different factors. this study was conducted to evaluate the effect of polishing and mechanical loads on wear of silorane-based and methyl methacrylate-based composites resins. materials and methods: of each dental composite (filtek p90 and filtek p60), 40 samples were fabricated in a polyethylene mold (4...

statement  of  problem:  patients’ demand  for  tooth-colored  restoratives  in the posterior region is increasing. clinicians use universal nanohybrid resin composites for both anterior and posterior regions. there are few published reports comparing fracture toughness of nonohybrids and that of hybrid composite stored wet and dry. objectives: to investigate the fracture toughness of three nan...

Aim: The purpose of this study is to analyse marginal sealing ability of bulk fill flowable composite resins. Materials and Methods: A standard class V cavity (3 mm mesiodistal width, 3 mm occlusogingival height, and 1.5 mm axial depth) will be prepared at the cementoenamel junction (CEJ) on the facial surface of eighty human teeth with a 0.5 mm wide 45° beveled enamel margin and a 90° cervical...