Due to limitations in standard endodontic therapy there have been great endeavors to effectively clean, shape and disinfect the root canal system while preserving the natural anatomy of the tooth [1]. Maintaining the natural canal anatomy and preservation of tooth structure has been correlated to higher clinical success rates [2-5]. A major issue in tooth preservation is the need to maximize cl...

The purpose of this study was to compare and evaluate the shaping ability of the three different Ni-Ti file systems used by undergraduate students. Fifty undergraduate students prepared 150 simulated curved root canals in resin blocks with three Ni-Ti file systems ProFile (PF), Manual ProTaper (MPT), Rotary ProTaper (RPT). Every student prepared 3 simulated root canals with each system respecti...

The purpose of this project was to observe the amount of apical and mid-curve transportation produced by a range of nickel titanium (NiTi), titanium alloy and stainless steel (SS) files. Tests were carried out in simulated curved root canals produced in epoxy resin blocks. Seven commercially available file types were tested using sizes 15 to 40. Instrumentation was carried out to 1 mm beyond th...

Canal plays a prominent role in improving regional transportation conditions, economic development and cultural dissemination. However, the complexity of canal project will inevitably cause disturbance to water bodies develop series impacts. This paper summarizes engineering contents involved projects, combines experience waterway conservancy hub on ecological environment, analyzes main environ...

instruments have been traditionally used with a continuous rotary motion, but more recently, a new approach to the use of nickel-titanium instruments in a reciprocating movement has been introduced by Yared (2004). The clockwise (CW) and counter-clockwise (CCW) rotations used by Yared were four-tenths and two-tenths of a circle respectively, and the rotational speed utilized was 400 rpm. The co...

BACKGROUND Habitat modifications resulting from human transportation and power-generation infrastructure (e.g., roads, dams, bridges) can impede movement and alter natural migration patterns of aquatic animal populations, which may negatively affect survival and population viability. Full or partial barriers are especially problematic for migratory species whose life histories hinge on habitat ...

AIM  To evaluate morphological changes to the major foramen after overinstrumentation with ProTaper Universal and ProFile Vortex Ni-Ti rotary instruments. METHODOLOGY Twenty-eight mesiobuccal canals of maxillary and mandibular first molars were divided into two groups of 14 canals each. The root canals were prepared with ProTaper Universal or ProFile Vortex instruments. ProTaper and Vortex in...

AIM To evaluate root canal transportation at the major foramen through the use of stainless steel size 08 K-Flex files, size 10 reamers, and XF finger spreaders when used as patency instruments. METHODOLOGY One hundred and two mesiobuccal canals of maxillary and mandibular first molars were randomly divided into three groups (34 canals each). Size 08 stainless steel K-Flex files, size 10 stai...

The tonnage capacity of the Suez Canal has almost doubled since its reconstruction. risk analysis oil and products transportation is carried out in paper, considering this factor from Persian Gulf to America, order reveal economic efficiency existing recommended routes. According research outcomes calculations, it proved that most expensive path route through Canal. It can be profitable on a sh...

AIMS The aim of this study was to evaluate the shaping effects of two M-wire and two traditional nickel-titanium (NiTi) rotary systems in simulated S-shaped resin canals. SUBJECTS AND METHODS Forty simulated S-shaped canals in resin blocks were instrumented with two traditional (ProTaper, Sendoline S5) and two M-wire (WaveOne, GT series X) NiTi systems according to the manufacturers' instruct...