PURPOSE The aim of this study was to evaluate the surface hardness of six composite resins: Revolution, Natural Flow, Fill Magic Flow, Flow-it! (flowables), Silux Plus (microfilled) and Z100 (minifilled) before and after polishing at different times. MATERIALS AND METHODS For this purpose, 240 specimens (5mm diameter, 1.4mm high) were prepared. Vickers hardness was determined before and after...

Based on the smoothness criterion of minimum curvature variation of the curve, tangent angle constraints guaranteeing an optimized geometric Hermite (OGH) curve both mathematically and geometrically smooth is given, and new methods for constructing composite optimized geometric Hermite (COH) curves are presented in this paper. The comparison of the new methods with Yong and Cheng’s methods base...

1Assistant Professor, Dental Materials Research Center, Department of Pedodontics, Babol University of Medical Sciences, Babol, Iran. 2Assistant Professor, Dental Materials Research Center, Department of Operative Dentistry, Babol University of Medical Sciences, Babol, Iran. 3 Dental Student, Dental Materials Research Center, Babol University of Medical Sciences, Babol, Iran. 4Assistant Profess...

Let d 2 D = {1, . . . , 9}, and let k be a positive integer with gcd(k, 10d) = 1. Define a sequence {sn(k, d)}n=1 by sn(k, d) := k dd . . . d | {z } n k. We say k is a d-composite sandwich number if sn(k, d) is composite for all n 1. For a d-composite sandwich number k, we say k is trivial if sn(k, d) is divisible by the same prime for all n 1, and nontrivial otherwise. In this paper, we develo...

Traumatized teeth that are displaced from their normal alveolar positions need to be repositioned and stabilized so that healing can occur. Orthodontic ligature wire bonded into place with resin-based composite works well for splinting teeth. Using a self-etching adhesive bonding system and compomer material facilitates both the resin bonding and its removal. This clinical report describes a si...

To compare force levels obtained from glass fibre-reinforced composite (FRC) archwires. Specifically, FRC wires were compared with polymer matrices having different dimethacrylate monomer compositions. FRC material (E-glass provided by Stick Tech Ltd, Turku, Finland) with continuous unidirectional glass fibres and four different types of dimethacrylate monomer compositions for the resin matrix ...

objective: to measure the long-term linear hygroscopic expansion (lhe) of several materials using bulked and layered techniques. materials and methods: seven materials were used; fuji cap ii, fuji ii lc, photac-fil aplicap, vitremer, dyract, tetric and z100. ten specimens (6×4 mm) were made for each material using layered and bulked techniques (each group comprises five specimens). the specimen...

Background and aims. The majority of failures in Class II amalgam restorations occur in the first primary molar teeth; in addition, use of compomer instead of amalgam for primary molar teeth restorations is a matter of concern. The aim ofthe present study was to compare the success rate of Class II compomer and amalgam restorations in the first primary molars. Materials and methods. A total of ...

Objectives This study aimed to assess the effect of wet and dry finishing and polishing on microhardness and roughness of microhybrid and nanohybrid composites. Materials and Methods Thirty samples were fabricated of each of the Polofil Supra and Aelite Aesthetic All-Purpose Body microhybrid and Grandio and Aelite Aesthetic Enamel nanohybrid composite resins. Each group (n=30) was divided int...