Twenty crossbred yearling steers (421 kg) were used to evaluate the effects of implanting with trenbolone acetate (TBA; 120 mg), estradiol-17β (E(2); 25.7 mg), and the combination (120 mg TBA and 24 mg E(2)) on adipogenic and myogenic mRNA concentrations. Animals were blocked by BW, and within each block, assigned ...

OBJECTIVE: The aim of this in vitro study was to assess lipopolysaccharide microleakage at conical implant-abutment connections of two-piece dental implants in terms of the expression levels of genes involved in lipopolysaccharide-mediated proinflammatory cytokine production. MATERIALS AND METHODS: Two implant systems with conical implant-abutment connections were inoculated with lipopolysaccharide and ...

Understanding of ectopic implantation within Fallopian tube (FT) is limited. In the human uterus, the putative 'window of implantation' in the mid-luteal phase of the menstrual cycle is accompanied by increased endometrial epithelial expression of the integrins α(1)β(1), α(4)β(1), and α(v)β(3) and its ligand osteopontin. Similar cyclical changes in FT ...

This article presents a case of bilateral unerupted supernumerary teeth in the mandibular premolar region. Surgical removal of the right-sided supernumerary tooth had to be carried out as it was impeding the eruption of the mandibular first premolar. However, its supernumerary antimere, lay dormant.

Small interfering RNA (siRNA) is useful tool for specific and efficient knockdown of disease-related genes. However, in vivo applications of siRNA are limited due to difficulty in its efficient delivery to target cells. In this study, we investigated the efficacy of a biodegradable hydrogel, poly-d,l-lactic acid-p-dioxanone-polyethylene glycol block co-polymer (PLA-DX-PEG), as ...

BACKGROUND: Our research goal is to develop a safe, reproducible surgical approach for implantation of a wide-field retinal stimulating array. The aim of this study was to evaluate the pathological response to acute implantation of a functional prototype electrode array in the suprachoroidal space. METHODS: The surgical techniques to implant ...

OBJECTIVE: To evaluate the effect of adenomyosis on endometrial gene expression and its correlation with clinical outcome. DESIGN: Transcriptomic analysis of the endometrium of women with adenomyosis during the window of implantation. Retrospective matched cohort study of the impact of adenomyosis on oocyte donation (OD) outcome. SETTING: University-affiliated infertility clinic ...

Peroxisome proliferator-activated receptors (PPARs) play an important role in different compartments of the female reproductive system in rodents and humans. However, expressional profiles and physiological functions of PPARs in the endometrium prior to the placentation are not well understood. In this study, we determined expressional profiles of the PPARs during ...

OBJECTIVE:: This study aims at applying cDNA microarray analysis in vitro for establishing and comparing the osteogenic properties of dental implants with different surface characteristics. MATERIALS AND METHODS:: Saos-2 osteoblasts were cultured in bottom-cone tubes in presence of 5 different dental implants with various surface characteristics. Cells adherent to dental ...

ABSTRACT: BACKGROUND: BMP-2 is known to accelerate fracture healing and might also enhance osseointegration and implant fixation. Application of recombinant BMP-2 has a time-limited effect. Therefore, a gene transfer approach with a steady production of BMP-2 appears to be attractive. The aim of this study was to examine the effect ...

Objective. To investigate expression of matrix metalloproteinases (MMPs) and the tissue inhibitors of MMPs (TIMPs) at the feto-maternal interface and non-implantation sites in unruptured tubal pregnancies. Design. Prospective study. Setting. University teaching hospital. Population. Eighteeen patients with unruptured tubal pregnancy undergoing salpingectomy. Methods. Immunohistochemistry was used to detect MMP-2, -9 ...

Recently, a new experimental stromal hyperplasia animal model corresponding to clinical benign prostatic hyperplasia (BPH) was established. The main objective of this study was to elucidate the roles of the intermediate-conductance Ca(2+)-activated K(+) channel (K(Ca)3.1) in the implanted urogenital sinus (UGS) of stromal hyperplasia BPH model rats. Using DNA microarray, ...

OBJECTIVE:: To describe the dental implant practice profile of Hong Kong general dental practitioners in 2008 and the trend since 2004. MATERIALS AND METHODS.: A self-administered questionnaire was mailed to 630 dentists through systematic sampling of registered dentists. RESULTS:: A total of 290 completed questionnaires were returned (response rate, 53%). ...

The purpose of this study was to evaluate the dentists' decision making in the maxillary molar region to find out how it is influenced by general practitioners' and specialists' characteristics as well as by the external evidence. A questionnaire was developed containing clinical cases and statements to assess practitioners' opinions ...

This study examined the activity and ability of materials to mineralize teeth in gaps, simulating microleakage between the materials and teeth. Three restorative materials (two glass ionomer cements and a compomer) were used in this study. Cured disks of restoratives were placed over flat human tooth surfaces (enamel and dentin), ...

Although effective preventive strategies exist for pit and fissure caries, prevention of proximal caries remains a significant challenge. This split-mouth study was designed to investigate the effect of glass-ionomer cement (GIC) on the progression of initial proximal caries in posterior teeth, testing the hypothesis that local application of fluoride-releasing GIC ...

This systematic review sought to quantitatively answer the question as to whether, in tooth cavities of the same size, type of dentition and follow-up period, resin-modified glass-ionomer (GIC) restorations, when compared to conventional GIC restorations, offer a significant caries preventive effect, as measured by the absence of caries lesions at ...

PURPOSE: To compare the fracture toughness (KIc) of tooth-colored restorative materials based on a four-point bending; to assess the effect of distilled water and a resin surface sealant (G-Coat Plus) on the resistance of the materials to fracture. METHODS: Specimens were prepared from six materials: Quix Fil; Dyract (Dentsply), Freedom ...

To test newer glass-ionomer-based materials as sealant materials. One glass-ionomer sealant was light-cured to obtain an early setting reaction. The null-hypothesis tested was: there is no difference in marginal leakage of sealants produced with high-viscosity glass-ionomer, with and without energy supplied, and that of glass-carbomer, in comparison with resin composite ...

Biomaterials for the restoration of oral function are prone to biofilm formation, affecting oral health. Oral bacteria adhere to hydrophobic and hydrophilic surfaces, but due to fluctuating shear, little biofilm accumulates on hydrophobic surfaces in vivo. More biofilm accumulates on rough than on smooth surfaces. Oral biofilms mostly consist of ...

Secondary caries and restoration fracture remain common problems in dentistry. This study tested the hypothesis that combining nano-CaF(2) and glass fillers would yield nanocomposites with high mechanical properties and F release. Novel CaF(2) nanoparticles (56-nm) were synthesized via spray-drying and incorporated into resin. F release increased with increasing the nano-CaF(2) ...

Bioactive glass, an osteoproductive material, has received considerable attention as a bone graft substitute in the treatment of bony defects. Bioactive CaO-SiO(2)-P(2)O(5) glass was prepared using the sol-gel method, and mineralization behaviour in vitro was investigated by soaking it in simulated body fluid (SBF). Cellular cultivation in vitro, MTT (3-(4,5-dimethylthiazol-2-yl)- ...

This study investigated the effects of spherical silica filler (SSF) on the workability and mechanical properties of resin-modified glass ionomer cements for luting (RMGICL). Varying powder/liquid ratios (P/L=2.0, 2.2, 2.4, and 2.6) of a commercially available glass ionomer cement (Fuji Lute, GC Corp.) were mixed with SSF at different weight ...

This study sought to evaluate the microhardness of root dentine adjacent to glass-ionomer and composite resin restorations after erosive challenge. A crossover study was performed in two phases of 4 consecutive days each. One hundred twelve bovine root dentine slabs were obtained, and standardized box-shaped cavities were prepared at center ...

The aim of the present study was to evaluate the Knoop hardness of high viscous glass ionomer cement (GIC) Ketac Molar Easy Mix (3M ESPE, Saint Paul, USA) submitted to different types of compounds for surface protection. Sixty specimens of GIC were made in PVC molds with 7.5 mm diameter ...

PURPOSE: To determine the self-sealing properties of Ceramir C&B, a new calcium aluminate-based luting material and to compare it to two commercially available cements, using a bacterial model system. METHODS: 30 premolars were prepared in a standardized fashion with a total angle of convergence of approximately 10-12 degrees for complete ...

OBJECTIVE: To investigate the effect of various energy sources on the upper and lower surface hardness of a setting glass ionomer with various thicknesses. METHOD: Cylindrical specimens (4 mm diameter by 1, 2 or 4 mm thickness) of a glass-ionomer cement were prepared with no applied energy source (control), by ...

PURPOSE: Previous studies have shown the relationship of individual clinical variables to the survival of Dicor (Corning Glass Works) restorations. The purpose of the present investigation was to examine the effect of combinations of these variables on the intraoral survival of Dicor restorations. MATERIALS AND METHODS: Dicor glass-ceramic restorations (n=1,444) ...

The purpose was to compare the shear bond strength of luting cements to foundation materials and to determine the effect of storage in lactate buffer solution. Disks that were 8 mm in diameter and 2-mm thick were fabricated from foundation substrates: amalgam, composite resin, resin-modified glass ionomer, and glass ionomer ...

The impact of bone diseases and trauma in developed and developing countries has increased significantly in the last decades. Bioactive glasses, especially silica-based materials, are called to play a fundamental role in this field due to their osteoconductive, osteoproductive and osteoinductive properties. In the last years, sol-gel processes and supramolecular ...

AIM: To appraise quantitatively current evidence regarding the caries-preventing effect of resin-modified glass-ionomer cement (RM-GIC) fissure sealants in comparison to that of resin-based fissure sealants. STUDY DESIGN: Systematic review with meta-analysis. METHODS: 8 Anglophone databases and 2 Lusophone databases were searched until 15 April 2009, using a pre-determined search strategy. ...

The purpose of this article is to highlight some recent in vitro and in vivo studies of bioactive glasses containing strontium and to review selected literature on the in vitro and in vivo behaviour of bioactive glasses to relate this to the structure of the glass. The strontium-glass studies were ...

The present study evaluated and compared the retentive strength of three luting cements. A total of forty five freshly extracted human primary molars were used in this study. The teeth were prepared to receive stainless steel crowns. They were then randomly divided into three groups, of fifteen teeth each, so ...

This prospective clinical trial compared the retention rate and caries-preventive efficacy of two types of sealant modalities over a 3-year period. Using a split-mouth randomised design, 1280 sealants were randomly applied on sound permanent second molars of 320 young patients aged between 12 and 16 years. Half of the teeth ...

OBJECTIVES: Resin composite sealants are retained longer than low-viscosity glass-ionomer sealants. Nevertheless, a systematic review showed that there is no evidence that resin composite sealants are superior to low-viscosity glass-ionomers in preventing dentine carious lesion development. This case study aimed to investigate reasons for this. METHODS: 4 teeth were sealed ...

This study aims to compare the patient-perceived post-cementation sensitivity of class II metal restorations preoperatively, immediately after cementation, one week after cementation and one month after cementation with (1) Glass Ionomer luting cement (2) Zinc Phosphate cement and (3) Resin-modified Glass Ionomer luting cement. A total of 60 patients, irrespective ...

The demineralization of dentin was studied when placed adjacent to one of four experimental denture base-resins. These experimental resins contained polymethylmethacrylate (PMMA) and 0, 5, 10, 20 or 30 wt% surface reaction-type prereacted glass-ionomer (S-PRG) filler, respectively. A dentin thin-section was sandwiched between these resins and subjected to demineralization for ...

BACKGROUND/PURPOSE: Atraumatic restorative treatment (ART) was developed primarily for use in underserved areas of the world. This study was designed to compare caries prevention with high-viscosity glass ionomer cement (GIC) sealants placed according to the ART procedure and light-cured composite resin sealants after 3 years. METHODS: The study was conducted ...

OBJECTIVE: This in vitro study evaluated the influence of cavity preparation using the Er:YAG laser and restorative materials containing fluoride on preventing caries lesions. BACKGROUND: It has been suggested that cavity preparation using the Er:YAG laser has a potential for improving resistance to secondary caries on enamel. METHODS: Forty unerupted ...

The role of aluminum in glass-ionomers and resin-modified glass-ionomers for dentistry is reviewed. Aluminum is included in the glass component of these materials in the form of Al(2)O(3) to confer basicity on the glass and enable the glass to take part in the acid-base setting reactions. Results of studies of ...

Glass ionomer based materials are clinically popular in several areas of restorative dentistry, but restoration of cervical lesions has proven particularly successful. Various etiologies, conformations, locations and structural characteristics make non-carious cervical lesions more challenging to adhesive restorative procedures and marginal seal in the long run. Due to their characteristics, ...

Composite resins and glass-ionomer cements were introduced to dentistry in the 1960s and 1970s, respectively. Since then, there has been a series of modifications to both materials as well as the development other groups claiming intermediate characteristics between the two. The result is a confusion of materials leading to selection ...

The purpose of this quantitative systematic review was to appraise the evidence on the caries-preventive effect of glass ionomer cement (GIC) in relation to resin-based fissure sealants. Nine English and two Portuguese databases were searched (15 January 2008). Randomized clinical trials and systematic reviews were considered for inclusion. Trial exclusion ...

Adherence of oral bacteria to the surface of dental restorative materials is considered an important step in the development of secondary caries and periodontal disease. The aim of this study was to investigate and compare the adherence of different restorative materials to Streptococcus mutans strain (CCUG35176) in order to ascertain ...

STATEMENT OF PROBLEM: Vital tooth bleaching may affect properties of dental cements used for fixed prostheses. PURPOSE: The purpose of this study was to examine the effect of a combined in-office and at-home bleaching regimen on changes in surface roughness and depth loss of a variety of commercially available dental ...

The objective of the study was to examine the effects that fluoride ions released from different dental glass ionomer cements may have on titanium. The study included determination of the amounts of released ions and measurement of the color changes on titanium plates cemented with four kinds of commercial glass ...

Different secondary caries models may present different results. The purpose of this study was to compare different in vitro secondary caries models, evaluating the obtained results by polarized-light microscopy (PLM), scanning electron microscopy (SEM), and energy dispersive X-ray spectroscopy (EDS). Standardized human enamel specimens (n = 12) restored with different ...

OBJECTIVES: The purpose of this prospective study was to evaluate the clinical outcome of crown-retained fixed dental prostheses (FDPs) made from a lithium-disilicate glass-ceramic (IPS e.max Press, Ivoclar-Vivadent). METHODS: Thirty-six three-unit FDPs were placed in 28 patients. The FDPs replaced teeth in the anterior (16%) and posterior (84%) regions. All ...

The objective of the study was to test the hypothesis that resorbable radio-opaque bioactive glass markers can be used in radiostereometric analysis (RSA). Cones made from (1) bioactive glass 1-06 with 2.5 wt.% BaSO(4), (2) glass 1-06 with 10 wt.% BaSO(4), (3) glass 1-06 without any additives and (4) nearly ...

PURPOSE: To qualitatively and quantitatively assess the architectural arrangement of microorganisms in biofilm developed on the surface of different restorative materials: ceramic (C), resin composite (RC), conventional (CGIC) and resin-modified glass-ionomer cements (RMGIC). METHODS: Streptococcus mutans was used to develop a biofilm that adhered to the surfaces of the selected ...