Effect of the Degree of Conversion on Mechanical Properties and Monomer Elution from Self-, Dual- and Light-Cured Core Composites.

The objective of this work was to measure and correlate the degree of conversion (DC), mechanical properties and monomer elution from self-, dual- and light-cured core composites. Five samples of each of the following materials were prepared for each test: Clearfil (Core, Photo Core, Automix), Bisco (Core-Flo, Light-Core and Bis-Core). DC was determined using FTIR, compressive and flexural strength and modulus of elasticity using a universal testing machine and microhardness using Vickers hardness.

Application of a Novel Modification of the Microbond Test for Evaluation of Adhesive Bond Strength Between Fiber Posts and Dual-Cure Dental Resin Cement.

BACKGROUND While several tests can be used in the laboratory evaluation of composite resin-based cement materials, the push-out test remains the most prevalent. Due to difficulties in sample preparation, as well as a highly complex procedure, we attempted to develop an alternative method for testing the bond strength of dental resin cement materials. MATERIAL AND METHODS Ninety-six experimental samples of 2 dual-cure resin cements and 1 fiber post system were prepared for the 2 testing procedures: the push-out test and the modified Microbond test.

[Clinical and microbiological effects of the initial periodontal therapy].

Introduction: Periodontitis is a destructive inflammatory disease of the tooth-supporting tissues, primarily caused by Gram-negative microorganisms. Thus, the primary objective of cause-related initial periodontal therapy is disruption and removal of the subgingival biofilm.

Objective: The aim of this study was to evaluate the clinical and microbiological effects of the initial therapy in patients diagnosed with chronic periodontitis.

Poly(methyl-methacrylate) nanocomposites with low silica addition.

Statement Of Problem: Poly(methyl-methacrylate) (PMMA) represents the most popular current denture material. However, its major drawbacks are insufficient ductility and strength.

Purpose: The purpose of this study was to improve the mechanical properties of PMMA in denture base application by adding small quantities of nanosilica.

Improving mechanical properties of flowable dental composite resin by adding silica nanoparticles.

Background/aim: The main drawback of flowable dental composite resin is low strength compared to conventional composite resin, due to a low amount of filler, neccessary for achieving low viscosity and ease of handling. The aim of this study was to improve mechanical properties of flowable dental composite resin by adding small amount of nanoparticles, which would not compromise handling properties.

Methods: A commercially available flowable dental composite resin material was mixed with 7 nm aftertreated hydrophobic fumed silica and cured by an UV lamp.

Determination of surface roughness and topography of dental resin-based nanocomposites using AFM analysis.

The aim of this study was to determine surface roughness and topography of polished dental resin-based nanocomposites. Four representative dental resin-based nanocomposites were tested in the study: two nanohybrids (Filtek Z550 and Tetric EvoCeram) and two nanofilled (Filtek Ultimate Body and Filtek Ultimate Translucent); and two reference materials: one microfilled (Gradia Direct) and one microhybrid (Filtek Z250). Polymerized cylindrical specimens (4 mm x 2 mm) were polished with multi-step polishing system- Super Snap.

[Three dimensional mathematical model of tooth for finite element analysis].

Introduction: The mathematical model of the abutment tooth is the starting point of the finite element analysis of stress and deformation of dental structures. The simplest and easiest way is to form a model according to the literature data of dimensions and morphological characteristics of teeth. Our method is based on forming 3D models using standard geometrical forms (objects) in programmes for solid modeling.

Cephalometric indicators of the vertical dimension of occlusion.

The aim of this investigation was to establish precise indicators of the vertical dimension of occlusion (VDO) which could be used as objective parameters in prosthodontic treatment providing exact control of the reconstructed vertical dimension of occlusion, early detection of errors and correction of the vertical dimension of occlusion during complete denture manufacturing. A total of 60 lateral cephalometric radiographs of subjects with natural dentition and class I skeletal jaw relationship, of Serbian nationality from the region of Vojvodina, were included in the investigation. Thirty subjects were males, and thirty females, their age range was 20 to 29 years.

Prevalence of oral herpes simplex virus reactivation in cancer patients: a comparison of different techniques of viral detection.

Background: Oral reactivation of latent Herpes simplex virus (HSV) infection may easily occur in cancer patients. Virus reactivation can cause oral mucosa damage, worsen already existing lesions caused by stomatotoxic effect of cancer therapy and, whether symptomatic or asymptomatic, ample spreading and promote viral transmission.

Methods: Polymerase chain reaction (PCR), cell-culture and direct immunofluorescence have been used to determine the frequency of oral HSV reactivation in 60 patients undergoing chemotherapy for different malignancies.

[Current trends in dental practice].

Introduction: This paper reviews recent trends in basic dental disciplines and advantages of new clinical procedures over conventional.

Prosthetic Reconstruction Of Depulped Teeth: Post and core restoration is one of the most common treatment modalities applied when the remaining coronal tooth structure is not sufficient to provide the necessary retention form for restoration. Nowadays, the restoration of endodontically treated teeth is based on the use of materials with a modulus of elasticity similar to that of dentin.

[Effects of smoking on edentulous alveolar ridge mucosa].

Introduction: Tobacco use is an important risk factor for advanced histopathological findings on edentulous alveolar ridge mucosa. The aim of this study was to examine the effects of smoking on histopathological findings on edentulous alveolar ridge mucosa.

Material And Methods: The experimental group consisted of 48 patients (29 smokers and 19 nonsmokers).

[Light induced polymerization of resin composite restorative materials].

Introduction: Dimensional stability of polymer-based dental materials is compromised by polymerization reaction of the monomer. The conversion into a polymer is accompanied by a closer packing of molecules, which leads to volume reduction called curing contraction or polymerization shrinkage. Curing contraction may break the adhesion between the adhesive system and hard tooth tissues forming microgaps which may result in marginal deterioration, recurrent caries and pulp injury.

[Effect of smoking on resorption of residual alveolar ridges in complete denture wearers].

Introduction: Based on literature data it is obvious that there is a connection between smoking and periodontal diseases. Alveolar bone loss increases with smoking. Tobacco smoking affects the proportion of subgingival bacterial flora by influencing oxidoreduction potential of dental plaque and thus making conditions for development of anaerobic bacteria.

Generation of hepatitis C virus-like particles by use of a recombinant vesicular stomatitis virus vector.

Hepatitis C virus (HCV), a major etiologic agent of hepatocellular carcinoma, presently infects approximately 400 million people worldwide, making the development of protective measures against HCV infection a key objective. Here we have generated a recombinant vesicular stomatitis virus (VSV), which expresses the HCV structural proteins, by inserting the contiguous Core, E1, and E2 coding region of HCV into the VSV genome. Recombinant VSV expressing HCV Core, E1, and E2 (VSV-HCV-C/E1/E2) grew to high titers in vitro and efficiently expressed the incorporated HCV gene product, which became fully processed into the individual HCV structural proteins.