نتایج جستجو برای: file fracture
تعداد نتایج: 151799 فیلتر نتایج به سال:
Aim: In vitro study evaluation of the cyclic fatigue resistance of reciprocating and rotary single-file system [Wave One Gold (WOG), Reciproc, Hyflex electrical discharge machining (EDM) file systems] utilizing cyclic fatigue testing device. Materials and methods: Three nickel–titanium rotary systems (Hyflex EDM size #25, 0.06 taper and Reciproc and WOG size #25, 0.06 taper) were used in this s...
objectives: the purpose of this study was to evaluate the resistance to fatigue failure of five different nickel-titanium rotary files in three different curved trajectories. materials and methods: a total of 150 neoniti a1, race 25.06, mtwo 25.06, twisted file 25.06 and protaper next x2 files with the tip size of 25 were tested (n=30 for each group). three groove types simulating curved canals...
کتب زبان انگلیسی نقش بسزایی در آموزش زبان انگلیسی ایفا می کنند چرا که در طول تاریخ آموزش زبان خارجی در ایران کتب بسیاری به عنوان منبع اصلی مورد استفاده قرار گرفته است . امروزه با توجه به علاقه فراوان افراد به یادگیری زبان انگلیسی و توسعه امکانات چاپ ، مجموعه خوبی از کتب در دسترس مدرسان و موسسات آموزش زبان قرار دارد . بنابراین انتخاب آگاهانه و ارزیابی کتب موجود در کتابفروشی ها اجتناب ناپذیر به ن...
OBJECTIVES To examine, in the province of Alberta, temporal trends, regional variations in treatment options and in-hospital death rates after a femoral neck fracture. DESIGN A retrospective cohort study. PATIENTS Six years' data were abstracted from the Alberta Morbidity File, the Alberta Health Stakeholder File and the Alberta Health Care Claims File. Patients were included if they were A...
This systematic review was registered in PROSPERO (CRD42017075917) and aimed to investigate whether the available clinical evidence supports hypothesis that reciprocating motion results a lower incidence of nickel-titanium files fracture compared continuous rotation. Clinical studies reported engine-driven were included. The main exposure kinematics, primary outcome fracture. overall 2.27%, wit...
Background. This study compared the cyclic fatigue resistance, bending resistance and cross-sectional areas of Reciproc Blue (RPC Blue), WaveOne Gold (WOG), and Genius File (GF) NiTi rotary systems. Methods. Forty RPC Blue R25 (25/.08), 40 WOG Primary (25/.07) and 40 GF (25/.04) files were used in the present study. Flexibility of the files was determined by 45° bending test. The instruments we...
INTRODUCTION The purpose of this study was to compare the torsion and bending properties of OneShape (OS; Micro Mega, Besançon, France) and WaveOne (WO; Dentsply Maillefer, Ballaigues, Switzerland) single-file systems. METHODS The torsional strength of OS size #25, 0.06 taper and WO primary size #25, 0.08 taper was measured by using a torsiometer after fixing the apical 5 mm of the instrument...
INTRODUCTION A great number of studies performed in the last 3 decades have shown the superior mechanical features of nickel-titanium files as compared with stainless steel files. A novel file system recently developed, Gentlefile, defies these findings and claims to have superior qualities despite the fact it is made from stainless steel. METHODS Three file systems were used in this experime...
INTRODUCTION File fracture is one of the main procedural mishaps in endodontic treatment. The aim of this in vitro study was to compare the fracture rate of three NiTi rotary systems; Hero 642, Mtwo and FlexMaster in artificial canals. METHODS AND MATERIALS In this study, bovine long bone was used. After primary preparation of bones, longitudinal sections with 4-cm diameter were cut and encod...
UNLABELLED The fracture of an instrument is a recognized complication in endodontics. The immediate response to a fractured instrument is frequently to regard the treatment as a failure. Several factors must, however, be taken into account to evaluate the prognosis of the tooth in this situation. The objective of the endodontic treatment with or without a fractured instrument remains the same, ...
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