background: although composite restorations are really valuable for esthetic zones, they have shown less longevity rather than amalgam restorations. since it may be related to the method used for curing the composite, postcuring could increase the degree of conversion and result in more long‑lasting composite restorations. this study was planned to evaluate the effect of two different postcurin...

Abstract Background and Aim: One of the major problems with resin composite restorations is the weakness of bonding between the new and aged composites. Since appropriate micromechanical retention is necessary for the repair of aged resin composite restorations, the level of surface roughness after sandblasting can be influential in this regard. Considering the diverse composition of avail...

background. repairing aged composite resin is a challenging process. many surface treatment options have been proposed to this end. this study evaluated the effect of different surface treatments on the shear bond strength (sbs) of nanofilled composite resin repairs. methods. seventy-five cylindrical specimens of a filtek z350xt composite resin were fabricated and stored in 37°c distilled water...

Introduction: Increased consumption of energy drinks has raised concerns about their effects on dental restorations. This study assessed the effects of two energy drinks on the surface microhardness of methacrylate and silorane-based composites after 1-week and 1-month periods. Materials & Methods: In this in-vitro study, 90 cubic samples were prepared from Filtek P90, Filtek Z250 and Filtek Z...

Background and Aim: Several methods are available for intraoral repair of chipped porcelain restorations by composite resin. Also, there is still controversy regarding the best method of porcelain repair in terms of bond strength and cost effectiveness. This study aimed to compare three methods of porcelain surface treatment on shear bond strength (SBS) of composite to porcelain. Materials a...

background and aims. anterior esthetic restoration is challenging in pediatric dentistry, due to limited durability and poor retention of the restoration.this study assessed the effect of air abrasion on tensile failure load of composite class iii restorations using different preparation techniques. materials and methods. 100 extracted human anterior primary teeth were divided, based on the pre...

bacillus subtilis k40b was isolated from rice rhizospheres and its potential for production of xylanase was evaluated using biochemical methods. the gene for xylanase in b. subtilis k40b was amplified, sequenced and assigned to the ncbi genebank. the gene size was estimated to be 563 bp encoding 413 amino acids. comparison of the xylanase gene with reference sequences showed that the xylanase o...

background and aims. a proper bond must be created between the existing composite resin and the new one for successful repair. the aim of this study was to compare the effect of three mechanical surface treatments, using diamond bur, air abrasion, and er,cr:ysgg laser, on the repair bond strength of the silorane-based composite resin. materials and methods. sixty cylindrical composite resin spe...