The effect of the distance between post and residual gutta-percha on the clinical outcome of endodontic treatment. Moshonov J, Slutzky-Goldberg I, Gottleib A & Peretz B Journal of Endodontics (2005) 31(3) 177-179. (Department of Endodontics, Hadassah School of Dental Medicine, Jerusalem, Israel) After endodontic therapy, teeth are often restored with a post and core. In many cases after post ce...

Many agencies use the AASHTO Guide for Design of Pavement Structures to design their pavement systems. The limitation inherent in this method is the empirical nature of the decision process, which was derived from a road test conducted almost 45 years ago in Ottawa, Illinois. The newly released Mechanistic-Empirical Pavement Design Guide (MEPDG), based on NCHRP Study 1-37A, has adopted a mechan...

Abstract This study extracted 16 climatic data variables including annual temperature, freeze thaw, precipitation, and snowfall conditions from the Long-term Pavement Performance (LTPP) program database to evaluate regionalization for pavement infrastructure. The effect significance of climate change were firstly evaluated using time as only predictor t-test. It was found that both temperature ...

Abstract Climate attributes such as precipitation, extreme temperature, and freeze-thaw cycles along with traffic loads cause pavement distresses. The maintenance need for pavements is decided based on the condition rating International Roughness Index (IRI). Generally, an IRI less than 2.68 m/km acceptable, a greater considered unacceptable classified “very poor” of pavement. It imperative to ...

Long-term oxidative ageing occurs in asphalt pavements when they are exposed to the ambient environment for extended periods. This phenomenon is dependent on multiple physical fields, including heat transfer, oxygen diffusion from air into interconnected voids of pavement, void channels mastic inside, and growth oxidation products bitumen. Most existing models were established via coupling limi...

Deterioration models are important and essential part of any Pavement Management System (PMS). These models are used to predict future pavement situation based on existence condition, parameters causing deterioration and implications of various maintenance and rehabilitation policies on pavement. The majority of these models are based on roughness which is one of the most important indices in p...

Flexible pavement structure design is a complex task because of the variability input parameters and failure mechanisms. Therefore, aim this study to develop implement simplified Mechanistic-Empirical (M-E) method based on 1993 American Association State Highway Transportation Officials (AASHTO), National Cooperative Research Program (NCHRP) 9-22, NCHRP 1-37A 1-40D projects. This methodology im...