1 2008-4676 دانشگاه ازاد اسلامی-واحد دندانپزشکی 1002 oral surgery Sadri D 1 1 2019 15 4 1 21 22 12 2018 22 12 2018
981 Perio Designing and fabrication of biodegradable composite membranes based on chitosan fibrobin-polyvinyl alcohol by solvent casting method for bone tissue engineering jabari farzane houshmand behzad hesaraki saeed 1 1 2019 15 4 201 210 25 09 2018 Abstract Background & Aim: Designing and fabrication of biodegradable and bioactive membranes are the important issues in guided bone regeneration while these membranes should maintain their structural integrity during repair, have the required mechanical, physical and biological properties and selective permeability. One of the approaches to achieve this purpose is the fabrication of composite membranes based on biopolymers. Materials and Methods: In this research, the fabrication and characterization of composite membranes composed of chitosan-silk fibrobin and polyvinyl alcohol have been performed.chitosan solution and fibroin- polyvinyl alcohol solution were mixed in different ratio and membranes were fabricated by solvent casting method. Mechanical properties such as tensile strength and ultimate strain percentage and physical properties including water absorption and degradation rate of membranes were investigated. Results: The FTIR spectrum of the extracted fibrobin showed peaks at 1650 cm-1, 1530 cm-1, and 1244 cm -1. The XRD and SEM images showed that the synthesized fibrin has the structure of beta plates. The results of physical and mechanical properties of membranes showed that the presence of fibroin in the composition increases the mechanical strength. Increasing the amount of chitosan in the composition increased the water absorption and degradation rate of membranes. Conclusion: Fibroin is a suitable polymer for increasing mechanical strength, controlling the degradation rate, improving the water absorption ability and is so biocompatible. Solvent casting method with controlling the viscosity of solution and solvent evaporation rate is appropriate method for fabrication the membranes. 984 Pediatrics Evaluation of effect of four types of fissure sealant on growth inhibition of streptococcusmutans and lactobacillus acidophilus )In vitro( Moradi dehnavi m amini N askarizadeh N vandyousefi j Tolouei A 1 1 2019 15 4 211 217 08 10 2018 15 01 2019 Abstract Background and Aim: Since some sealants can  control cariogenic microorganisms, therefore the evaluation of antibacterial  effect of different sealants are the subject of this study. Materials and Methods: in this experimental study,  the plates were divided into 5 groups.Group I control:two plates including Blood Agar with Mutans Streptococcus (SM) & the other MRS with Lactobacillus Acidophilus (LA).Group II:6 plates Blood Agar culture with two wells and inoculation of SM with addition of two fissure sealants; Clinpro 3M with fluoride &flowable composite 3M without fluoride.In group III all the steps were the same as group IIexcept that in which fissure sealants used were  Conseal F with flouride& Eco-s without fluoride.In groups IV & V all the steps were the same as groups II & III respectively except that MRS culture media with inoculation of Lactobacillus Acidophilus was used.The diameter of the growth inhibition halo (zone of inhibition) was measured using calipers. The experiment was repeated for three consecutive days with 26 plates  and the results were recorded every 48 hours.The data were analyzed using Two-way ANOVA Results: The diameter of growth inhibition halo for Clinpro 3M in the medium where Streptococcus mutans was cultured was 27/29+ 3/59mm&where Lactobacillus Acidophilus was cultured was 12/37+ 1/46mm which differed from other three materials significantly. (p<0.000) Conclution: It seems, Clinpro 3M had the most inhibitory effect on Streptococcus mutans and , Lactobacillus acidophilus  growth.   931 Perio Comparison of two commercial dermal matrix on biological behavior of endothelial cells (in vitro) maoghadas omid JFAFRI EHSAN bakhshi Borhan HARANDI MOHAMAD 1 1 2019 15 4 218 225 08 05 2018 Abstract   Aim and background: Behavior of endothelial cells can have significant role regarding their proliferation and attachment on acellualr dermal grafts in regeneration procedures.The purpose of this study is to evaluate the effects of two dermal scaffolds on attachment and proliferation of human umbilical vein endothelial cells. Methods and Materials: This study was conducted on experimental approach. Human umbilical vein endothelial cells were seeded, experimentally. Two commercially available types of ADM were used. 1. Kish tissue regeneration co. 2. Knowledge Based Company of Persian Textile Products. The proliferation rate  in matrix and control groups were evaluated 12,24, 84 hours and 7 days after culture using MTT 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide ) test. The morphologic evaluation was made after 24 hours incubation with Ethanol and Dehydrated Hexamethyldisilazane (HMDS) using Platinium coated drops. The surface and circularity of cells was examined by electronic microscope. Results:  The results for DAPI and MTT index was similar in 3 groups(P<0.4).After 1 week the control group rate was 2.66 ± 0.001, fist group, 2.09 ±0.001 and second group, 1.64±0.17. The result was statistically significant.(P<0.1) Conclusion: It seems, in experimental status, both matrix was similar in endothelia cell adhesion. But, proliferation rate of endothelial cells was more in matrix 1 v.s matrix 2 after 7 days. 940 restorative dentistry Effect of various irrigating solution on microleakage of class 5 glass ionomer restorations Habibi Elahe Heidarian Anis Namdar Seyedeh Fatemeh 1 1 2019 15 4 226 232 21 05 2018 Abstract   Background & Aim: During cavity preparation, smear layer is created that this layer should be removed with irrigators. Leakage may be decrease after irrigation. The aim of this study was to evaluate the leakage after irrigation by chlorhexidine 2%, sodium hypochlorite 2.5% and water in glass ionomer class V restorations. Materials and Method: In this experimental-in vitro study, the class V restoration preparation was prepared in the standard cervical portion of buccal accept in 51 human premolar teeth. The samples were divided to 3 groups due to type of irrigants. Group 1: sodium hypochlorite 2.5% was applied in cavity for 30 seconds. Group2: chlorhexidine 2% was applied in cavity for 30 seconds. Then, all cavities were washed for 10 seconds in order to remove agents and their extra waters. Group3: only washed with water. The cavities were filled by Glass ionomer reinforced composite resins. After 1000 thermal cycles of 5-55 °c, the microleakage of samples, was evaluated with dye penetration and data was analyzed statistically with chi-square. Results: The microleakage of enamel were 94.1% in water irrigant, 41.2% in chlorhexidine 2%, 17.6% in sodium hypochlorite 2.5% (p<0.001) and for dentin, in water, chlorhexidine 2% and sodium hypochlorite 2.5% were 88.2%, 70.6% and 17.6% respectively. (p<0.001)   975 Oral Medicine Evaluation of Isolated Helicobacter Pylori genes from dental plaques and association with gastrointestinal ulcers by multiplex PCR method ghanbari Elahe amini k amini parviz 1 1 2019 15 4 233 240 10 07 2018 Introduction: Helicobacter pylori is a gram negative, curved, oxidase-fermented fermentation agent. This organism has been identified as a typical bacterial strain of cancer. The bacteria are the main cause of many gastrointestinal diseases such as stomach inflammation, duodenal ulcer, gastric ulcer, duodenal ulcer, and in particular gastric cancer. Methods: A total of 120 patients with periodontitis referring to Tehran dental clinics were selected from 111 dental plaque samples. Sterile physiology serum was used to transfer the sample. Growth in Brucella agar + 1% starch + 10-7% at 37 ° C and 95% humidity and CO2 concentration of 0.5% in CO2 incubator. In order to identify the molecules, DNA extraction was performed and then the sequences of JW22 and JW23 regions were used for accurate identification. Results: The molecular analysis of the studied genes showed that the prevalence of cagA, cagT, cagE, vacA and hrgA genes showed that the prevalence of these genes was 19% of Helicobacter pylori strains of 3 (57.5%), 1 (0/19%), 2 (34/0%), 1 (19/0%) and 1 (19/0%) respectively. The multiplex PCR method used in this study was able to detect Helicobacter pylori genotypes based on virulence genes. Discussion: According to the findings of this study, the hrgA genotype and all types of cagA motifs can predict the chronicity of the disease and use the antibiotic resistance pattern appropriate for the design of appropriate treatment protocol, the drug was used to eradicate the disease and prevented the infection from entering the chronic phase.   950 restorative dentistry Evaluation the effect of aluminum chloride on sheer bond strength of two steps and three steps etch- rinse bonding agents khodadadzadeh pedram saati keivan sadaghiani morad bonakdar bahar seyed usefi ehsan valaei naser 1 1 2019 15 4 241 247 02 06 2018 Abstract   Background & Aim: One of the important points in composite restorations is the bond strength, which, if reduced, can cause treatment failure and decay recurrence. One of the reasons for reducing the bond strength can be the use of homeostasis in restorations. Therefore, in this study, the effect of aluminum chloride hemostasis on the shear strength of three-step and two-step bonds was investigated. Materials and Methods: This experimental study was performed on forty human premolar teeth in four groups as follows: A: Aluminum chloride + Three-step bond + Composite. B: Aluminum chloride + two-step bond + Composite. C: Three-step bond + Composite. D: Two-step bond + composite. Then the shear strength of the bond was measured in MPa and compared in four groups with Kruskal Wallis test. Result: In the three-step, non-homeostasis bonding group, the shear bond strength was 53/8± 47/3 MPa and with the homeostasis it was 45/4±31/1 MPa, but this difference was not significant in these groups.  (p < 0.8) In the two-step, non-homeostasis bonding group, the strength was 83.8 ± 35 MPa and with homeostasis was 56/7±27/9 MPa and the test showed that the hemostasis reduced the strength of bond.( p<0.1) Conclusion:The hemostasis substance does not seem to have an effect on the shear strength of the three-step bond, but it decreases the shear strength of the two-step bond. 985 oral patho The correlation between morningness and eveningness pattern with dentistry students' learning. Farhadi S Ashorion V Sadri D Haseli M 1 1 2019 15 4 248 255 08 10 2018 Abstract Background and aims: Considering the importance of the related factors in learning and in the light of the fact that there was no study of this kind on dentistry students, so this research has been carried out in 2016 to evaluate the relationship between morning & evening patterns with the learning levels of dentistry students of Dentistry Faculty, Tehran Medical sciences, Islamic Azad University. Material & Methods: in this descriptive study, first, the students were undergo morningness-eveningness pattern by Horn-Oostberg method. Then, the relationship between students’s learning level and the results of both end-of-session and end-term tests was evaluated by a linear regression test. Results: In this study, 69 dentistry students were participated. 22 persons (31.88%) had an overnight sleep pattern, 28 persons (40.57%) intermediate, and 19 persons (27.53%) in the morning. in both tests, there was a significant correlation between the morningness-eveningness pattern and the learning level. End-of-session test with (P <0.004) and end-term test with (P <0.002) Besides, There was not any significant correlation between age and sex of participants and their level of learning (P = 0.45, 0.10) in both tests.  Conclusion: It seems, The morningness -eveningness pattern of the students analyzed in this study was significantly correlated with their learning outcomes, that is to say that students who had morningness pattern had higher scores than midway ones and these ones had better scores compared to the eveningness ones.   967 Radiology Frequency and apparent characteristics of infraorbital ethmoid (Haller's) cells and its correlation with related factor in panoramic radiography Sakhdari Shirin Mehr alizadeh Sandra mohammadi bina Sarvin Taheri Monir Sadat Masoumi sheida Heshmati Leila tehran azad university of dentistry tehran azad university of dentistry tehran azad university of dentistry tehran azad university of dentistry tehran azad university of dentistry tehran azad university of dentistry 1 1 2019 15 4 256 261 24 06 2018 Abstract   Background and Aim : One of the concerns of dentists is maxillofacial pain and sinusitis symptoms that be related to presence of Haller's cells. Considering the importance of the issue and the differences in previous studies, the aim of this study was to determine the frequency and apparent characteristics of these cells in Iranian population using digital panoramic radiography. Materials and Methods: In this descriptive study, 650 panoramic radiography, which were in terms of contrast, clarity and darkness were acceptable, were collected from patients with no history of trauma and surgery in the maxillofacial area. Then, the presence of Haller's cell and its apparent features were evaluated and frequency was estimated by statistical analysis with 95% confidence in society and the effect of age, sex and side was judged by Chi-square test. Results: Of the 650 examined samples, 32% had Haller's cell, of which 28.8% were in men and 71.2% in women, and the sex did not play a role in the number of Haller's cell (P <0.4), but Haller's cell in terms of age (Over 39 years old) was found in 81.2% and was not found in 28.7% which was significant (P <0.0001). Most of the Haller's cell were observed to be round (46.2%) and oval (51.4%), frequency of the Haller's cellin left side was 23.5% and in right side was 25.5%. in 50.4% observed in both side. Conclusion: considering that Haller's cell can play a role in the development of maxillofacial pains, it is important to be aware of its existence, and it seems that as the age rises, this anatomical feature appears more.