Facts About Cracks in Teeth

Examining the nature of stress distribution within the intact tooth can aid in understanding how natural tooth structures are able to resist mechanical forces during masticatory function. Identification of potential fractures in teeth on clinical examination is essential for correct diagnosis, particularly if there is pulpal involvement. This discussion will consider the different types of fracture, their identification and management. This paper will highlight management of tooth fractures, including identifying prognostic indicators, which are largely dependent on the extent of the fracture within the tooth structure.

Download Full-text

Mandibular Implant-Supported Overdenture: An In Vitro Comparison of Ball, Bar, and Magnetic Attachments

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-11-00050 ◽

2013 ◽

Vol 39 (3) ◽

pp. 302-307 ◽

Cited By ~ 6

Author(s):

V. Manju ◽

T. Sreelal

Keyword(s):

Stress Distribution ◽

Strain Gauge ◽

Load Transfer ◽

Implant Surface ◽

Transfer Characteristics ◽

Ball Bar ◽

Different Types ◽

Dial Gauge ◽

In Vitro Comparison

In an implant-supported overdenture, the optimal stress distribution on the implants and least denture displacement is desirable. This study compares the load transfer characteristics to the implant and the movement of overdenture among 3 different types of attachments (ball-ring, bar-clip, and magnetic). Stress on the implant surface was measured using the strain-gauge technique and denture displacement by dial gauge. The ball/O-ring produces the optimal stress on the implant body and promotes denture stability.

Download Full-text

Stress Distribution Analysis of Different Types of Blade for a Fermentation System

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.479-480.319 ◽

2013 ◽

Vol 479-480 ◽

pp. 319-323

Author(s):

Cheng Chi Wang ◽

Po Jen Cheng ◽

Kuo Chi Liu

Keyword(s):

Stress Distribution ◽

Maximum Stress ◽

Effective Means ◽

Materials Processing ◽

Distribution Analysis ◽

Stress Distributions ◽

Fermentation System ◽

Different Types ◽

Inclined Angle ◽

Key Parameter

Fermentation system is widely used for food manufacturing, materials processing and chemical reaction etc. Different types of blade in the tank for fermentation cause distinct stress distributions on the surface between fluid and blade, and appear various flow fields in the tank. So, this paper is mainly focused on analyzing the stress field of blades under different scales of blade with fixing rotational speed. The results show that the ratio of blade length to width influences stress distribution on the blades. At the same time, the inclined angle of blade is also the key parameter for the consideration of design and appropriate design will decrease the maximum stress. The results provide an effective means of gaining insights into the stress distribution of fermentation system.

Download Full-text

Difficulties in the diagnosis of fungal rhinosinusitis – Literature review

Romanian Journal of Rhinology ◽

10.1515/rjr-2016-0001 ◽

2016 ◽

Vol 6 (21) ◽

pp. 11-17 ◽

Cited By ~ 1

Author(s):

Elena Patrascu ◽

Claudiu Manea ◽

Codrut Sarafoleanu

Keyword(s):

Literature Review ◽

Clinical Examination ◽

Correct Diagnosis ◽

Response To Treatment ◽

Research Directions ◽

Fungal Rhinosinusitis ◽

Patients At Risk ◽

Controversial Topic ◽

Invasiveness Potential

Abstract Fungal rhinosinusitis is an important pathological entity, a highly controversial topic in the medical world today, by the various research directions it offers. In order to be able to predict a patient’s prognosis and his response to treatment, first we must have a classification of fungal rhinosinusitis. The authors considered it is important to make a distinction between invasive and noninvasive forms of fungal rhinosinusitis. The most important step in the management of fungal rhinosinusitis is to have a correct diagnosis, based on strong criteria, which will lead to a better prognosis of this disease. Because of its invasiveness potential, especially in patients at risk, it is essential to have a correct and fast diagnosis in case of fungal rhinosinusitis, in order to begin the treatment as fast as possible, for a favourable prognosis. The only way to establish diagnosis in a reliable way is to make a detailed clinical examination and to take biopsy samples.

Download Full-text

The Strength Evaluation and Reliability Analysis of Periodic Symmetric Struts Support

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.462-463.1164 ◽

2011 ◽

Vol 462-463 ◽

pp. 1164-1169

Author(s):

Jing Xiang Yang ◽

Ya Xin Zhang ◽

Mamtimin Gheni ◽

Ping Ping Chang ◽

Kai Yin Chen ◽

...

Keyword(s):

Distribution Function ◽

Probability Distribution ◽

Stress Distribution ◽

Least Squares ◽

Reliability Analysis ◽

Least Squares Method ◽

Nonlinear Least Squares ◽

Distribution Model ◽

Different Types ◽

Nonlinear Least Squares Method

In this paper, strength evaluations and reliability analysis are conducted for different types of PSSS(Periodically Symmetric Struts Supports) based on the FEA(Finite Element Analysis). The numerical models are established at first, and the PMA(Prestressed Modal Analysis) is conducted. The nodal stress value of all of the gauss points in elements are extracted out and the stress distributions are evaluated for each type of PSSS. Then using nonlinear least squares method, curve fitting is carried out, and the stress probability distribution function is obtained. The results show that although using different number of struts, the stress distribution function obeys the exponential distribution. By using nonlinear least squares method again for the distribution parameters a and b of different exponential functions, the relationship between number of struts and distribution function is obtained, and the mathematical models of the stress probability distribution functions for different supports are established. Finally, the new stress distribution model is introduced by considering the DSSI(Damaged Stress-Strength Interference), and the reliability evaluation for different types of periodically symmetric struts supports is carried out.

Download Full-text

Nanotechnology in Dentistry

ARCHIVES OF HEALTH INVESTIGATION ◽

10.21270/archi.v6i11.2279 ◽

2017 ◽

Vol 6 (11) ◽

Author(s):

José Alcides Almeida de Arruda ◽

Cinthia Figueiredo de Oliveira ◽

Carina Silva de Paula ◽

Vanessa Carla Furtado Mosqueira ◽

Amália Moreno ◽

...

Keyword(s):

Drug Delivery ◽

Delivery Systems ◽

Nanometer Scale ◽

Tooth Structure ◽

Online Databases ◽

Disease Diagnostics ◽

Wide Range ◽

Different Types ◽

Safety Assessments ◽

Oral Analgesia

Introduction: Nanotechnology is a rapidly expanding field that encompasses the development, manipulation, and application of structures on the nanometer scale. Applications of nanotechnology to dentistry are particularly promising and comprise materials and devices designed to achieve maximal therapeutic efficacy with minimal side effects. Objective: This review discusses the advantages of nanotechnology and the different types of nanostructures used in dentistry. Material and Method: In this study, online databases: pubmed, medline and scielo were searched to analyse the current understanding of the potential of nanotechnology in dentistry, including the restoration of tooth structure with nanocomposites and the development of nanoparticles for dentin remineralisation, drug delivery, disease diagnostics, oral analgesia, oral hygiene maintenance, local anaesthesia, tooth desensitisation, and bone tissue repair. Results: The study demonstrated a wide range of nanotechnological strategies in different dentistry areas and suggests that nanotechnology-based delivery systems may be very useful to improve treatment, prevention and repair in dentistry in the future. Conclusion: There is little or no clinical experience for the nanotechnology-based drug delivery systems cited herein. Safety assessments and clinical trials are the next step in their development.Descriptors: Nanotechnology; Dental Research; Biocompatible Materials.

Download Full-text