Objectives: The aim of this study was to compare in vitro penetration and adaptation of light curing ormocer based fissure sealant and non­filled low viscosity sealant material. Materials and Methods: Extracted human molars (n = 108) were randomly assigned to 2 groups. Admira Seal and Teethmate F­1 were used as sealant materials in the study. Each tooth was sectioned using an Isomet cutter into...

This opening article defines the ways in which three mentoring interaction elements--focus, purpose, and authorship--distinguish between effective and ineffective mentoring relationship styles. The framework described can help mentors better understand the difference between prescriptive and instrumental styles and differentiate laissez-faire from developmental mentoring. It also reveals unique...

Genital human papillomavirus (HPV) infection is the most common viral sexually transmitted infection (STI) and is likely the most common STI in the United States.1-4 Genital HPV infection is an important public health concern because persistent oncogenic (also called high-risk) HPV infection is the main etiologic factor for cervical cancer, causing almost 100% of all cervical cancer cases world...

During the last 5 years JPL has examined a number of concepts 2 for robotically controlled balloons or aerobots. The Venus Geoscience Aerobot (VGA) concept uses reversible fluid altitude control to carry out repeated descents to the surface of Venus. This concept uses frozen water to keep the electronics cool. The balloon must periodically go to high altitude so that the water can be refrozen. ...

This paper presents a holistic framework for evaluating learning materials and designs for learning. A holistic evaluation comprises investigations of the potential learning potential, the actualised learning potential, and the actual learning. Each aspect is explained and exemplified through theoretical models and definitions.

The study was to evaluate the performance of different materials used in dental operative simulation and compare them with those of natural teeth. Three typical phantom teeth materials were compared with extracted permanent teeth by a nanoindentation system and evaluated by students and registered dentists on the drilling sensation of the materials. Moreover, the tool life (machinability) of ne...

Color match is one of the most important characteristics of aesthetic restorative materials. Maintenance of color throughout the functional lifetime of restorations is important for the durability of treatment. This characteristic is not constant among dental materials. The purpose of this research was to assess the color stability of five aesthetic restorative materials when immersed in a coff...

introduction: the scientific, technological and economic development of a society is closely related to its public health. therefore; improvement of health service quality along with increasing the number of health facilities is one of the main concerns of health care authorities in developed countries. this study was designed to compare accreditation models of health care organizations in euro...