Tehran: International Journal of Scientific Research in Dental and Medical SciencesInternational Journal of Scientific Research in Dental and Medical Sciences2676-54972120200301Evaluation of Dentin Thickness around Second Mesiobuccal Canal in Maxillary First Molar Using Cone Beam Computed Tomography (CBCT)1510488710.30485/ijsrdms.2020.218099.1037ENZahra BornaDepartment of Endodontics, Dental School, Urmia University of Medical Sciences, Urmia, Iran0000-0002-6533-5325Mohammad Mohammadi KhoshrouDepartment of Endodontics, Dental School, Urmia University of Medical Sciences, Urmia, Iran0000-0001-9543-3762Haleh MirzaeiDental School, Urmia University of Medical Sciences, Urmia, Iran0000-0003-3735-6054Golchin JabbariDepartment of Endodontics, Dental School, Urmia University of Medical Sciences, Urmia, Iran0000-0002-5527-9817Journal Article20200201<strong>Background and aim:</strong> Maxillary first molars exhibit a variety of anatomies in the mesiobuccal root, with a concavity on the distal wall limiting the canal's preparation to prevent strip perforation. This study evaluated the dentin thickness around the second mesiobuccal canal (MB2) in the maxillary first molar using cone-beam computed tomography (CBCT).<br /><strong>Materials and methods:</strong> The present retrospective descriptive cross-sectional study conducted on 120 CBCT images of patients referred to Radiology Centers of Urmia (Iran) between 2017 and 2019. Samples were collected using a convenience sampling method. A professional radiologist prepared all the CBCT images that had the least exposure required with proper image resolution. The first and second mesiobuccal canals (MB1 and MB2) were both detected. Two endodontists evaluated the dentin thickness around the MB2 canal in the mesial, distal, and palatal walls and its distance to MB1 at coronal, middle and apical cross-sections. Statistical significance level set at 0.05 and all analyses performed using SPSS version 23 software. <br /><strong>Results:</strong> In all three sections, the lowest dentin thickness was in the distal wall. The highest was in the palatal wall; this difference was statistically significant in all sections (p<0.05). Minimum distances of MB2 from mesial, distal and furcation surfaces and from MB1 canal were significantly different in coronal (p = 0.008), middle (p = 0.004) and apical (p = 0.001) sections.<br /><strong>Conclusion:</strong> The low thickness of distal wall indicates more conservative considerations in endodontic and prosthodontic treatments. The CBCT seems to be an effective and non-invasive method in examining root and canal morphology. It may be used as preoperative radiography to assess the dentin thickness in danger zones to prevent iatrogenic errors.http://www.ijsrdms.com/article_104887_6c06fbb4d70588dd2f6b1bb4b40d4705.pdfTehran: International Journal of Scientific Research in Dental and Medical SciencesInternational Journal of Scientific Research in Dental and Medical Sciences2676-54972120200301Strategy for Treating the Gastric Cancer: A Systematic Review and Meta-analysis61110427310.30485/ijsrdms.2020.215947.1033ENSomaye JamaliDepartment of Internal Medicine, Faculty of Medicine, Tehran University of Medical Sciences, Tehran, Iran0000-0003-4359-1667Ehsan KasraeiDepartment of Cardiology, School of Medicine, Guilan University of Medical Sciences, Rasht, Iran0000-0001-7739-3250Armita Rezazadeh KalashamiSchool of Medicine, Guilan University of Medical Sciences, Rasht, Iran0000-0001-8147-9372Mahdie Barri DizajFaculty of Medicine, Babol University of Medical Sciences, Babol, Iran0000-0002-8202-8976Journal Article20200115<strong>Background and aim:</strong> Contemporary approaches to treat the stage IV patients could be generally divided into five groups of the palliative gastrectomy, radiotherapy, Chemotherapy, bypass, and gastric stent. The present systematic review and meta-analysis evaluated the overall survival to treat stage IV gastric cancer (GC) based on distinct signs and prognosis.<br /><strong>Materials and methods:</strong> MEDLINE, PubMed, Cochrane Library, Embase, ISI, google scholar have been utilized as the electronic databases for searching systematic literature until 2019. Then, Endnote X9, which is one of the software programs in the market, has been applied to manage the titles electronically. Searches were performed with keywords, “Gastric cancer”, “cancer”,” Gastric”,” Stage IV”, “Radiotherapy” “Chemotherapy” , “Gastrectomy”, “treatment of gastric cancer”, “bypass”.<br /><strong>Results:</strong> A total of 150, 93, 21 studies respective abstracts and topics have been discovered in the course of manual and electronic searches in the internet. Finally, a total of 10 studies for Palliative gastrectomy, five studies for Chemotherapy, and three studies for Radiotherapy required for this systematic review. <br /><strong>Conclusion:</strong> According to the meta-analysis, palliative gastrectomy exhibited a statistically significant survival advantage for the patients with the untreatable developed GC.http://www.ijsrdms.com/article_104273_61b5959a63dcb70f5ba57b8d3daebbc7.pdfTehran: International Journal of Scientific Research in Dental and Medical SciencesInternational Journal of Scientific Research in Dental and Medical Sciences2676-54972120200301Identify the Dentistry Students Perception of the Learning Environment (LE): A Literature Review121610446510.30485/ijsrdms.2020.217432.1035ENMir Mahdi SeyedashrafiDepartment of Oral and Maxillofacial Surgery, Dental School, Urmia University of Medical Sciences, Urmia, Iran0000-0002-8054-327XJavad JamaliSchool of Dentistry, Shahed University of Medical Sciences, Tehran, Iran0000-0002-4519-8925Ali RezaieSchool of Dentistry, Shahed University of Medical Sciences, Tehran, Iran0000-0001-8066-8657Amir Hosein JamaliSchool of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran0000-0002-7348-1816Journal Article20200126<strong>Background and aim:</strong> Learning environment in the process of medical education and the impact of the professional behavior of learners based on their understanding of learning environments is a unique role. The aim of this systematic literature review was evaluation. Identify the Dentistry Students’ perception of the LE.<br /><strong>Materials and methods:</strong> Some papers retrieved using the search strings were chosen via consideration of specific criteria for ensuring their relevance and whether they were able to reply to each RQ. Upon reading the full-text papers, all included studies meeting inclusion criteria that considered the titles, abstracts, and keywords were regarded as the pertinent paper.<br /><strong>Conclusion:</strong> Recommended to plan appropriately for holding educational courses and prepare conditions, facilities, and suitable environments for the growth of these educational approaches.http://www.ijsrdms.com/article_104465_ada8421a3bc96b9b3c7edbab844cf8fd.pdfTehran: International Journal of Scientific Research in Dental and Medical SciencesInternational Journal of Scientific Research in Dental and Medical Sciences2676-54972120200301A Huge Orofacial Myiasis, the Importance of Ideal Management: A Case Report171910481010.30485/ijsrdms.2020.217841.1036ENNicolas SolanoOral and Maxillofacial Surgery Unit, University Hospital of Maracaibo, Venezuela0000-0002-6054-0362Ariamay CastrilloOral Surgery Post-graduated Program, School of Dentistry, Universidad del Zulia, Venezuela0000-0002-6856-1547Enmanuel ParraOral Surgery Post-graduated Program, School of Dentistry, Universidad del Zulia, VenezuelaEnmanuel David Parra BoscanCarlos MedinaOral Surgery Post-graduated Program, School of Dentistry, Universidad del Zulia, Venezuela0000-0003-4509-973XJournal Article20200130It is widely accepting that Myiasis refers to an infestation of alive human animals or vertebrates from larvae of the Diptera insect family that feed on live or necrotic tissues depending on the species. The Cochliomyia hominivorax species is the most common, which feeds entirely on the necrotic tissues and is commonly founding in tropical and subtropical areas, first screw-worm larvae fed on the living tissues so that the egg deposition occurs on the periphery of the new wounds. The most common locations in the head and neck where this infestation appears are the ears, eyes, nose, oral cavity, sinuses, mastoid region, tracheotomy wound, and lymph nodes. Multiple parameters predispose to the possibility of presenting Myiasis in this area, such as the increased age, lower socioeconomic status as well as medical co-morbidities, and malignant tumors. Therefore, this study presented a case of a 71-year old patient with orofacial Myiasis, who received medical treatment, mechanical removal, surgical debridement and occlusion of the wound with liquor based on the essence of anis or anisette for the asphyxia of the larvae, with a satisfactory evolution after seven days of the protocol. This case provides interesting information that could help oral and maxillofacial surgeons manage the type of orofacial Myiasishttp://www.ijsrdms.com/article_104810_11c144d5bf4f6dac90fa68568451e1f9.pdfTehran: International Journal of Scientific Research in Dental and Medical SciencesInternational Journal of Scientific Research in Dental and Medical Sciences2676-54972120200301Incidental Finding of a Supernumerary Tooth Fused to a Mandibular Second Molar Using Cone Beam Computed Tomography (CBCT): A Case Report202210159110.30485/ijsrdms.2020.204662.1022ENNegin SoghliStudent Research Committee, Babol University of Medical Sciences, Babol, Iran0000-0002-6015-2212Mehrdad PanjnoushDepartment of Oral and Maxillofacial Radiology, Dental Faculty, Tehran University of Medical Sciences, Tehran, Iran0000-0001-5564-6261Maryam JohariDepartment of Oral and Maxillofacial Radiology, Dental Faculty, Babol University of Medical Sciences, Babol, Iranhttps://orcid.org/0000-0002-1792-2971Journal Article20191009The twinned tooth is a rare phenomenon among dental anomalies, which may develop during the bud stage tooth morph differentiation. Twinned tooth refers to the fusion of two adjacent tooth buds or gemination of the single bud. Clinically it is difficult to differentiate between fusion and gemination. During this anomaly, primary dentition is mostly affected rather than permanent dentition, and predominantly, it is observed unilaterally. Gemination is more common in the anterior region of maxilla, while fusion mainly occurs in the anterior mandibular region. There is no definite etiology for these anomalies reported, but genetic and environmental factors are mostly mentioned as potential risk factors. This paper describes a case of fusion of the second mandibular molar with a supernumerary tooth. Twinned teeth can cause clinical problems such as dental caries, periodontal, and aesthetic problems. Early diagnosis can be achieved through careful clinical and radiographic examinations; however, in most cases of twinned teeth, no significant clinical problem is reported.http://www.ijsrdms.com/article_101591_e98fe096f68b8dfc49bea7cdc25eb035.pdf