The Light Reflection Changes of Monolithic Zirconia and Lithium Disilicate after Using Two External Staining Kits following by Thermocycling.

Background: The purpose of the study was to evaluate the changes of light reflection% on two materials (monolithic zirconia and lithium disilicate) after using two external staining kits following by thermocycling.

Methods: Specimens were sectioned from monolithic zirconia (n = 60) and lithium disilicate ( = 60) then divided into six groups ( = 20). Two different types of external staining kits were used and applied to the specimens.

Effect of Denture Base Fabrication Technique on Adhesion In Vitro.

Denture stomatitis is a common manifestation of oral candidiasis affecting some 65% of denture wearers. This condition is initiated by the adherence of to denture base acrylic resin. The present study aimed to test the in vitro effect of traditional and novel fabrication methods on adhesion to denture base samples.

The Effect of Aging on the Roughness and Bacterial Adhesion of Lithium Disilicate and Zirconia Ceramics.

Purpose: This in vitro study was designed to compare bacterial adhesion to zirconia versus lithium disilicate crowns after artificial aging.

Materials And Methods: Seventy-five discs were tested in this study: 25 Cr-Co base metal discs (control), 25 zirconia discs, and 25 lithium disilicate discs. Each sample was polished and glazed appropriately.

An in vitro evaluation of marginal fit zirconia crowns fabricated by a CAD-CAM dental laboratory and a milling center.

Background: Marginal fit is critical for the success and longevity of a dental restoration. Zirconia crowns can be fabricated either chair-side, in a dental laboratory or in a milling center; each can give different marginal fits results. However, discussion of the marginal fit of zirconia crowns when different fabrication methods are compared is lacking in the literature.

Comparison of marginal fit between CAD-CAM and hot-press lithium disilicate crowns.

Statement Of Problem: Hot-pressing and computer-aided design and computer-aided manufacturing (CAD-CAM) are major techniques for the fabrication of lithium disilicate crowns. They exhibit different accuracies regarding marginal fit, an important factor in restoration survival. However, studies comparing the marginal fit of different fabrication methods are lacking.

Predicting the clinical performance of dental students with a manual dexterity test.

Dentists must be skilled when using dental mirrors. Working with mirrors requires spatial perception, bimanual coordination, perceptual learning and fine motor skills. Many studies have attempted to determine the predictors of manual skills among pre-clinical students, but consensus has yet to be reached.

Direct Contact Test for Evaluating Bacterial Growth on Machined and Rough Surface Implants: An In Vitro Study.

Objective: To use a modified direct contact test (DCT) to evaluate the bacterial growth on 3 commercially available implants.

Materials And Methods: Streptococcus salivarius growth was tested on 1 machined surface and 2 commercial rough surface implants. Seven implants from each group were fixed to the cover of a 96-well microtiter plate.

Survey results of currently used techniques and materials by dentists for fabrication of complete removable dental prostheses.

The present study was based on the screening of procedures and materials used by dentists in constructing complete removable dental prostheses, considering their professional background and years of experience. Questions arose regarding differences and similarities within the local dental society, of which approximately 75% were trained in Europeans countries with differences in academic background, and compared to international dentistry. A questionnaire web site was used in order to anonymously collect answers to the survey by general practicing and specialist dentists.

Collaboration Patterns and Processes Between Dentists and Dental Laboratories When Planning and Fabricating Implant-Supported Restorations.

Introduction: The success of implant-supported restorations is dependent on proper treatment planning, effective communication within the clinical team, and the use of appropriate methods and materials in the dental laboratory. The objective of this study was to determine collaboration trends between dentists and laboratories and to assess the common methods and materials involved in fabricating implant-supported restorations.

Methods: Questionnaires were distributed to dental laboratories and technicians.

Consequences of experience and specialist training on the fabrication of implant-supported prostheses: A survey.

Statement Of Problem: Fabricating fixed restorations on implants requires that dentists stay up-to-date with the scientific publications.

Material And Methods: A questionnaire containing 29 questions was sent to dentists, members of the Israeli Society of Prosthodontics, and university faculty members. Differences were evaluated using the chi-square and Fisher exact tests and Mann-Whitney U and Wilcoxon tests for questions enquiring into the frequency of use of certain methods (α=.

Evolution of cooperation and skew under imperfect information.

The evolution of cooperation in nature and human societies depends crucially on how the benefits from cooperation are divided and whether individuals have complete information about their payoffs. We tackle these questions by adopting a methodology from economics called mechanism design. Focusing on reproductive skew as a case study, we show that full cooperation may not be achievable due to private information over individuals' outside options, regardless of the details of the specific biological or social interaction.

Functional anatomy of the prostate: implications for treatment planning.

Purpose: To summarize the functional anatomy relevant to prostate cancer treatment planning.

Methods And Materials: Coronal, axial, and sagittal T2 magnetic resonance imaging (MRI) and MRI angiography were fused by mutual information and registered with computed tomography (CT) scan data sets to improve definition of zonal anatomy of the prostate and critical adjacent structures.

Results: The three major prostate zones (inner, outer, and anterior fibromuscular) are visible by T2 MRI imaging.