Comparison of various methods of restoring adhesion to recently bleached enamel.

Aim: This study compared the effectiveness of several techniques in restoring compromised bonding to recently bleached enamel.

Methods: Seventy-five healthy bovine incisors were divided into five groups (n = 15). Fifteen teeth (Group 1) remained intact, whereas 60 (Groups 2 to 5) underwent at-home bleaching with 16% carbamide peroxide.

Modulation of physiological and biochemical traits of two genotypes of Rosa damascena Mill. by SiO-NPs under In vitro drought stress.

Background: Drought is a major abiotic stress that restricts plant growth and efficiency although some nutrients such as silicon improve drought tolerance by regulating the biosynthesis and accumulating some osmolytes. In this regard, a completely randomized factorial design was performed with three factors including two genotypes ('Maragheh' and 'Kashan'), three concentrations of silicon dioxide nanoparticles (SiO-NPs) (0, 50, and 100 mg L), and five concentrations of PEG (0, 25, 50, 75, and 100 g L) with three replications.

Results: The findings showed that drought stress decreased protein content and it was improved by SiO-NPs, so the genotype of 'Maragheh' treated with 100 mg L SiO-NPs had the highest protein content.

Physical, mechanical, and antibacterial characteristics of bio-nanocomposite films loaded with Ag-modified SiO and TiO nanoparticles.

In this study, starch-based films incorporating metal oxide (MO ) nanoparticles (NPs) of TiO and SiO (at a concentration of 1 to 4 wt. %) were produced by solution casting method. In order to exhibit antimicrobial properties, MO NPs were modified by synthesizing silver (Ag) ions over the NPs using cationic adsorption method.

Development and validation of a theory of planned behavior-based weight control behavior questionnaire among postmenopausal women with osteoporosis.

Our aim was to develop a framework-based weight control behavior questionnaire (Weight-CuRB) and test its psychometric properties among a non-probability sample of 240 postmenopausal women with osteoporosis. Appropriate validity, simplicity, functionality and reliability were observed for the Weight-CuRB. The explanatory model fits the data well (χ2 [139] = 245.

Effect of Erbium:Yttrium-Aluminum-Garnet Laser Combined with Mineralizing Agents on Microhardness of Demineralized Dentin.

Objective: The aim of this study was to assess the combined effect of erbium:yttrium-aluminum-garnet (Er:YAG) laser and mineralizing agents including casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) and fluoride in improving the resistance of demineralized dentin at new demineralization process.

Materials And Methods: One hundred and twenty healthy dentin surfaces were prepared and demineralized using acidic solutions. Primary microhardness was measured (h1), and samples were randomly divided into six groups.

Comparative Evaluation of the Biochemical Effects of Ketamine plus Ketoprofen and Midazolam in the Premedication of Pigeons.

The present study was conducted with the aim of comparing the effects of premedication with ketoprofen and midazolam in birds. A total of 24 male pigeons with an approximate weight of 300 g were divided into four equal groups. The control group (Group I) was injected with ketamine alone.

Comparing the effect of a desensitizing material and a self-etch adhesive on dentin sensitivity after periodontal surgery: a randomized clinical trial.

Objectives: This double-blind randomized placebo-controlled clinical trial evaluated the ability of a desensitizing agent and a self-etch adhesive on cervical dentin sensitivity (CDS) after periodontal surgery.

Materials And Methods: Ninety hypersensitive teeth of 13 subjects were included in the study. After periodontal surgery, the teeth of each posterior sextant treated with one of the following materials: G1: Clearfil S Bond (Kuraray Dental), G2: Gluma Desensitizer (Heraeus Kulzer), and G3: placebo (water).

Effects of N-acetylcysteine and pentoxifylline on remote lung injury in a rat model of hind-limb ischemia/reperfusion injury.

Objective: To investigate the effects of N-acetylcysteine (NAC) and pentoxifylline in a model of remote organ injury after hind-limb ischemia/reperfusion (I/R) in rats, the lungs being the remote organ system.

Methods: Thirty-five male Wistar rats were assigned to one of five conditions (n = 7/group), as follows: sham operation (control group); hind-limb ischemia, induced by clamping the left femoral artery, for 2 h, followed by 24 h of reperfusion (I/R group); and hind-limb ischemia, as above, followed by intraperitoneal injection (prior to reperfusion) of 150 mg/kg of NAC (I/R+NAC group), 40 mg/kg of pentoxifylline (I/R+PTX group), or both (I/R+NAC+PTX group). At the end of the trial, lung tissues were removed for histological analysis and assessment of oxidative stress.

Evaluating the shear bond strength of enamel and dentin with or without etching: A comparative study between dimethacrylate-based and silorane-based adhesives.

Background: Silorane-based composites and their specific self-etch adhesive were introduced to conquest the polymerization shrinkage of methacrylate-based composites. It has been shown that additional etching of enamel and dentin can improve the bond strength of self-etch methacrylate-based adhesives but this claim is not apparent about silorane-based adhesives. Our objective was to compare the shear bond strength (SBS) of enamel and dentin between silorane-based adhesive resin and a methacrylate-based resin with or without additional etching.

Efficacy of four lining materials in sandwich technique to reduce microleakage in class II composite resin restorations.

Objectives: The aim of the present study was to evaluate the effect of four different sandwich techniques on gingival microleakage of Class II direct composite resin restorations.

Materials And Methods: Fifty sound human premolars were selected and randomly divided into five groups (n=10). Class II box only cavities were prepared in one of the proximal surfaces of each tooth with a gingival margin located approximately 0.

The Protective Effects of Exogenous Melatonin on Nicotine-induced Changes in Mouse Ovarian Follicles.

Background: Nicotine exposure causes impaired fertility and ovarian dysfunction. The aim of this study was to investigate the possible protective role of melatonin, which is known as an antioxidant agent on altered ovarian functions upon nicotine exposure.

Methods: A total of 32 female adult NMRI mice were divided randomly into four groups (n = 8).

Randomized clinical evaluation of the effect of chlorhexidine on postoperative sensitivity of posterior composite resin restorations.

Objectives: Evaluation of postoperative sensitivity in posterior teeth restored with etchand- rinse adhesive and composite resin after application of 2% chlorhexidine solution.

Method And Materials: Thirty participants with similar dental caries on both sides of the jaws were selected. After cavity preparation, each tooth was randomized to one of the following restoration methods.

The effect of bleaching on toothbrush abrasion of resin composites.

Aim: This experimental study was designed to focus on the effects of bleaching on toothbrush abrasion in three types of composites with different filler size.

Materials And Methods: Forty eight disks were prepared from three types of composite and divided into 6 groups. In the first three groups the abrasion test was done.

Energy dispersive x-ray analysis of corrosion products in nondiscolored dentin and a dye-extraction study of Class 2 composite restorations following amalgam removal.

Objective: To evaluate the effect of corrosion products on the microleakage of composite placed adjacent to nondiscolored dentin after amalgam removal.

Method And Materials: Sixty Class 2 cavities were prepared on extracted premolars, which were divided into four equal groups according to the manner in which they were restored: group 1, light-cured packable composite (Elite LS) to establish a microleakage baseline; group 2, a high-copper amalgam (World Work) previously stored in 37°C normal saline for 6 months to create amalgam corrosion products; group 3, identical to group 2, but the amalgam was later replaced with composite, leaving the cavity walls intact; and group 4, identical to group 3 except the cavity walls were extended 0.5 mm after amalgam removal prior to insertion of the composite.

Gastric strongyloidiasis as multiple small gastric nodules.

Background: Strongyloidiasis, a common intestinal parasitic infection, is endemic in tropical and subtropical regions and occurs sporadically in temperate areas. It is endemic in Guilan province, Iran, and especially affects the rural population.

Case Report: We report the case of a 43-year-old woman living in Anzali (in the north of Iran), with dyspepsia and epigastric pain for 2 years, unresponsive to H2 receptor antagonists and proton pump inhibitors.

Effect of different conditioning protocols on the adhesion of a glass ionomer cement to dentin.

Aim: The purpose of this study was to assess the effect of different surface treatments on the shear bond strength (SBS) of a resin modified glass ionomer cement (RMGIC) to dentin.

Methods And Materials: Forty human third molar teeth were randomly divided into four groups (n=10). The occlusal enamel was removed to obtain a flat surface of dentin.

Effect of posts on the fracture resistance of load-cycled endodontically-treated premolars restored with direct composite resin.

Aim: The aim of this study was to investigate the fracture resistance and failure mode of premolars restored with composite resin using various prefabricated posts.

Methods And Materials: Sixty sound maxillary premolars were divided into four equal sized groups. All but the control group received endodontic treatment followed by placement of mesiodistocclusal (MOD) composite restorations (Tetric Ceram) as follows: Group T = no post, Group DT = fiber reinforced composite (FRC) post (DT Light), Group FL = prefabricated metal post (Filpost).

Clinical evaluation of a resin-based desensitizing agent and a self-etching adhesive on the reduction of postoperative sensitivity of amalgam restorations.

Aim: The aim of this randomized, double blind clinical trial was to compare three lining materials (Adper Prompt L-Pop, VivaSens, and Copalite) versus unlined restorations on postoperative cold sensitivity of class I amalgam restorations.

Methods And Materials: Potential subjects were screened for the presence of four initial class I carious lesions on posterior teeth. Each tooth was assigned to treatments according to a randomized block design.