نتایج جستجو برای: thread pitch

تعداد نتایج: 35465  

Journal: :dental research journal 0
manisha g herekar viraj n patil shahnawaz s mulani megha sethi omkar padhye

background: the success of dental implants depends on the manner in which stresses are transferred to the surrounding bone. an important consideration is to design an implant with a geometry that will minimize the peak bone stresses caused by standard loading. the aim of this study was to assess the infl uence of implant thread geometry on biomechanical load transfer and to compare the differen...

Orthodontic miniscrews are widely used as temporary anchorage devices to facilitate orthodontic movements. Miniscrew loosening is a common problem, which usually occurs during the first two weeks of treatment. Macrodesign can affect the stability of a miniscrew by changing its diameter, length, thread pitch, thread shape, tapering angle and so on. In this study, a 3-D finite element analysis wa...

Journal: :journal of computational applied mechanics 0
fatemeh mottaghi dastenaei graduate ms student, school of mechanical engineering, isfahan university of technology, isfahan, iran mahdi moghimi zand assistant professor, school of mechanical engineering, college of engineering, university of tehran, tehran, iran saeed noorolahian assistant professor, school of mechanical engineering, college of engineering, university of tehran, tehran, iran

orthodontic miniscrews are widely used as temporary anchorage devices to facilitate orthodontic movements. miniscrew loosening is a common problem, which usually occurs during the first two weeks of treatment. macrodesign can affect the stability of a miniscrew by changing its diameter, length, thread pitch, thread shape, tapering angle and so on. in this study, a 3-d finite element analysis wa...

2014
Pan Ma Wei Xiong Baosheng Tan Wei Geng Jiaqiang Liu Weihong Li Dehua Li

This study investigated the influence of thread pitch, helix angle, and compactness on micromotion in immediately loaded implants in bone of varying density (D2, D3, and D4). Five models of the three-dimensional finite element (0.8 mm pitch, 1.6 mm pitch, 2.4 mm pitch, double-threaded, and triple-threaded implants) in three types of bone were created using Pro/E, Hypermesh, and ABAQUS software....

Journal: :Clinical oral implants research 2010
Heba Abuhussein Giorgio Pagni Alberto Rebaudi Hom-Lay Wang

OBJECTIVES Implant design features such as macro- and micro-design may influence overall implant success. Limited information is currently available. Therefore, it is the purpose of this paper to examine these factors such as thread pitch, thread geometry, helix angle, thread depth and width as well as implant crestal module may affect implant stability. SEARCH STRATEGY A literature search wa...

2014
Chen Sheng Zhao Dongbiao Lu Yonghua

For measurement of existing thread parameters using profile scanning, system error increases as pitch diameter, difference between the calibrating thread and measuring thread increases with the single gauge calibration method. There are several alignment deviations affecting the measurement of pitch diameter. To reduce the system error, a compensation method using two standard thread gauges to ...

Journal: :Transactions of the Japan Society of Mechanical Engineers 1966

2013
Ana Messias João Paulo Tondela Salomão Rocha Rita Reis Pedro Nicolau Fernando Guerra

Objectives: This paper describes a technique to produce individualized X-ray positioning devices for intraoral digital imaging of dental implants with long-term stability. Materials and Methods: An X-ray positioning device was built for Gendex Visualix eHD sensor, using the Dentsply rinn XCP-DS system individualized by the incorporation of the bite piece within an acrylic stent to perform succe...

2018
Ying Chen Xiaoyan Deng Xinying Shan Yubin Xing

Pulmonary embolism is a severe, potentially life-threatening condition. Inferior vena cava filters have been used to prevent recurrent pulmonary embolisms. However, the build-up of thrombosis in vena cava filters after deployment presents a severe problem to patients. Previous studies proposed that filters with helical flow are beneficial and capable of alleviating this problem. In this study, ...

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