نتایج جستجو برای: coil spring
تعداد نتایج: 75417 فیلتر نتایج به سال:
Introduction: Fixed orthodontic appliances which made of nickel titanium closed coil spring dan elastic chain is the most commonly used in dentistry. There are various factors that able to change force such as temperature, pH, and time. The purpose this research find out influence temperature toward changes chain. Method: method study was an experimental with 36 samples. samples were attached o...
In this study, a vibration energy-harvesting system is developed by first proposing horizontal bi-stable model comprising an elastic spring and mass block then applying electromagnetic induction power generation device composed of magnet coil. Subsequently, based on weight function that considers the mutual positional relationship between conducting coil, set simultaneous governing equations co...
Abstract:
 Objectives: This work aimed to determine the stress distribution around a mini-implant during dynamic canine retraction utilizing continuous and intermittent orthodontic forces three-dimensional finite element model.
 Materials Methods: Establishing model of retraction. The incorporates mini-implant, alveolar bone, maxillary teeth, closed coil spring, an elastic chain. They...
OBJECTIVE To report initial experience with a new occlusion device for native and residual patent ductus arteriosus. DESIGN Descriptive study of consecutive non-randomised patients undergoing a new method of patent ductus arteriosus closure with detachable coils. SETTING Tertiary centres for paediatric cardiology. PATIENTS 71 consecutive patients, aged 1.2-22 years, with a patent ductus a...
This study evaluated pulp changes in molars of rats submitted to tooth movement by application of a 0.4 N force. Twenty-five adult male Wistar rats (Rattus norvegicus, albinus) were randomly assigned to 5 groups (n=5), being one control group not submitted to force application, and four study groups of 6, 12, 24 and 72 h of force application. The study groups received a 5-mm long nickel-titaniu...
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