Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 248 55 Mahmoud Bahari Dental and Periodontal Research Center, Department of Operative Dentistry, Dental Faculty, Tabriz Medical Sciences University, Tabriz, Iran. Siavash Savadi Oskoee Dental and Periodontal Research Center, Department of Operative Dentistry, Dental Faculty, Tabriz Medical Sciences University, Tabriz, Iran. Soodabeh Kimyai Department of Operative Dentistry, Dental Faculty, Tabriz Medical Sciences University, Tabriz, Iran. Narmin Mohammadi Department of Operative Dentistry, Dental Faculty, Tabriz Medical Sciences University, Tabriz, Iran. Elmira Saati Khosroshahi Department of Operative Dentistry, Dental Faculty, Tabriz Medical Sciences University, Tabriz, Iran. 2015 10 16 To evaluate the effect of different light intensities on the degree of conversion (DC) of dual-cured resin cement at different depths of translucent fiber posts.Thirty translucent fiber posts were randomly assigned into three (n=10) groups. They were cemented in the simulated canal spaces using Duo-Link dual-cured resin cement. The cement was light-cured under 600, 800 and 1100 mW/cm(2) light intensities for 40 seconds. DC of the resin cement was calculated at cervical, middle and apical thirds using the spectra of FT-Raman spectrometer. Data were analyzed by repeated measurement ANOVA and Tukey's post hoc tests (α=0.05).In all the groups, the least DC was obtained at the apical region. There were no significant differences in the DC with different light intensities between the cervical and middle regions (p>0.05). However, in the apical region, the DC in both 800 and 1100 mw/cm(2) was similar (p>0.05), but greater with 600 mW/cm(2) light intensity (p=0.02 and p https://fid.tums.ac.ir/index.php/fid/article/view/466 https://fid.tums.ac.ir/index.php/fid/article/download/466/442

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 256 62 Mitra Farzin Associate Professor, Department of Prosthodontics Faculty of Dentistry, Shiraz University of Medical Science, Shiraz, Iran. Kianoosh Torabi Associate Professor, Depatment of Prosthodontics, Biomaterial Research Center Faculty of Dentistry, Shiraz, Iran. Ahmad Hasan Ahangari Associate Professor, Department of Prosthodontics Faculty of Dentistry, Shiraz University of Medical Science, Shiraz, Iran. Reza Derafshi Assistant Professor, Department of Prostodontics Faculty of Dentistry, Shiraz University of Medical Science, Shiraz, Iran. 2015 10 16 Provisional cements are commonly used to facilitate retrievability of cement-retained fixed implant restorations; but compromised abutment preparation may affect the retention of implant-retained crowns.The purpose of this study was to investigate the effect of abutment design and type of luting agent on the retentive strength of cement-retained implant restorations.Two prefabricated abutments were attached to their corresponding analogs and embedded in an acrylic resin block. The first abutment (control group) was left intact without any modifications. The screw access channel for the first abutment was completely filled with composite resin. In the second abutment, (test group) the axial wall was partially removed to form an abutment with 3 walls. Wax models were made by CAD/CAM. Ten cast copings were fabricated for each abutment. The prepared copings were cemented on the abutments by Temp Bond luting agent under standardized conditions (n=20). The assemblies were stored in 100% humidity for one day at 37°C prior to testing. The cast crown was removed from the abutment using an Instron machine, and the peak removal force was recorded. Coping/abutment specimens were cleaned after testing, and the testing procedure was repeated for Dycal luting agent (n=20). Data were analyzed with two- way ANOVA (α=0.05).There was no significant difference in the mean transformed retention (Ln-R) between intact abutments (4.90±0.37) and the abutments with 3 walls (4.83±0.25) using Dycal luting agent. However, in TempBond group, the mean transformed retention (Ln-R) was significantly lower in the intact abutment (3.9±0.23) compared to the abutment with 3 walls (4.13±0.33, P=0.027).The retention of cement-retained implant restoration can be improved by the type of temporary cement used. The retention of cast crowns cemented to implant abutments with TempBond is influenced by the wall removal. https://fid.tums.ac.ir/index.php/fid/article/view/464 https://fid.tums.ac.ir/index.php/fid/article/download/464/440

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 263 9 Mohammad Hossein Toodehzaeim Assistant Proffesor, Department of Orthodontics, Faculty of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Sogra Yassaei Associate professor, Department of Orthodontics, Faculty of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Maryam Karandish Assistant Proffesor, Department of Orthodontics, Faculty of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran. Sedigeh Farzaneh Dentist. 2015 10 16 path of microleakage between the enamel and adhesive potentially allows microbial ingress that may consequently cause enamel decalcification. The aim of this study was to compare microleakage of brackets bonded either by laser or acid etching techniques.The specimens were 33 extracted premolars that were divided into three groups as the acid etching group (group 1), laser etching with Er:YAG at 100 mJ and 15 Hz for 15s (group 2), and laser etching with Er:YAG at 140 mJ and 15 Hz for 15s (group 3). After photo polymerization, the teeth were subjected to 500 thermal cycles. Then the specimens were sealed with nail varnish, stained with 2% methylen blue for 24hs, sectioned, and examined under a stereomicroscope. They were scored for marginal microleakage that occurred between the adhesive-enamel and bracket-adhesive interfaces from the occlusal and gingival margins. Data were analyzed with the Kruskal- Wallis test.For the adhesive-enamel and bracket-adhesive surfaces, significant differences were not observed between the three groups.According to this study, the Er:YAG laser with 1.5 and 2.1 watt settings may be used as an adjunctive for preparing the surface for orthodontic bracket bonding. https://fid.tums.ac.ir/index.php/fid/article/view/462 https://fid.tums.ac.ir/index.php/fid/article/download/462/438

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 270 81 Surena Vahabi Assistant Professor of Periodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Bahareh Nazemisalman Assistant Professor of Pedodontics Department, Dental School, Zanjan University of Medical Sciences, Zanjan, Iran. Mojtaba Vahid Golpaigani Associate Professor of Pedodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Anahid Ahmadi Dentist. 2015 10 16 The alteration of cytokine balance is stated to exert greater influence on gingival overgrowth compared to the direct effect of the drug on the regulation of extracellular matrix metabolism. The current study evaluated the effect of phenytoin on the regulation of collagen, lysyl oxidase and elastin in gingival fibroblasts.Normal human gingival fibroblasts (HGFs) were obtained from 4 healthy children and 4 adults. Samples were cultured with phenytoin. MTT test was used to evaluate the proliferation and ELISA was performed to determine the level of IL1β and PGE2 production by HGFs. Total RNA of gingival fibroblasts was extracted and RT-PCR was performed on samples. Mann-Whitney U test was used to analyze the data with an alpha error level less than 0.05.There was a significant difference in the expression of elastin between the controls and treated samples in both adult and pediatric groups and also in the lysyl oxidase expression of adult controls and treated adults. No significant difference was found between collagen expression in adults.The significant difference in elastin and lysyl oxidase expression between adult and pediatric samples indicates the significant effect of age on their production. https://fid.tums.ac.ir/index.php/fid/article/view/460 https://fid.tums.ac.ir/index.php/fid/article/download/460/436

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 282 9 Soghra Yassaei Associate Professor, Department of Orthodontic Dentistry, Member of Social Determinants of Oral Health Research Center, Dental School, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Abdolrahim Davari Associate Professor, Department of Operative Dentistry, Member of Social Determinants of Oral Health Research Center, Dental School, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Mahjobeh Goldani Moghadam Post graduate student, Department of Orthodontic Dentistry, School of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Ahmad Kamaei Dentist. 2015 10 16 The aim of this study was to compare the shear bond strength (SBS) of resin modified glass ionomer (RMGI) and composite resin for bonding metal and ceramic brackets.Eighty-eight human premolars extracted for orthodontic purposes were divided into 4 groups (n=22). In groups 1 and 2, 22 metal and ceramic brackets were bonded using composite resin (Transbond XT), respectively. Twenty-two metal and ceramic brackets in groups 3 and 4, respectively were bonded using RMGI (Fuji Ortho LC, Japan). After photo polymerization, the teeth were stored in water and thermocycled (500 cycles between 5° and 55°). The SBS value of each sample was determined using a Universal Testing Machine. The amount of residual adhesive remaining on each tooth was evaluated under a stereomicroscope. Statistical analyses were done using two-way ANOVA.RMGI bonded brackets had significantly lower SBS value compared to composite resin bonded groups. No statistically significant difference was observed between metal and ceramic brackets bonded with either the RMGI or composite resin. The comparison of the adhesive remnant index (ARI) scores between the groups indicated that the bracket failure mode was significantly different among groups (P https://fid.tums.ac.ir/index.php/fid/article/view/458 https://fid.tums.ac.ir/index.php/fid/article/download/458/434

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 290 301 Fahimeh Akhlaghi Associate Professor,, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Mohammad Esmaeelinejad Resident, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Amin Shams Dental Researcher, Dental Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran. Arsalan Augend Private Practice, Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Shahid Beheshti University of Medica Sciences, Tehran, Iran. 2015 10 16 Squamous cell carcinoma (SCC) is the most common malignancy of the oral cavity. This study aims to evaluate different treatment procedures including neo-adjuvant, concurrent and adjuvant therapy in treating squamous cell carcinoma of the head and neck by a meta-analysis.The authors searched all electronic databases (Medline, Embase and Cochrane) for all the articles published from 1970 to January 2011. Data of the evaluated treatment procedures (chemotherapy or radiotherapy), number of patients, publishing date and the authors' names have all been extracted from the articles and have been categorized in a table.Forty-six researches are included in this study. All three ways show that using chemotherapy after or with radiotherapy improves the vitality rate significantly (p-value< 0.01).It is concluded that after deciding not to perform a surgery for treating SCC, the recommended treatment plan is chemotherapy and radiotherapy simultaneously. https://fid.tums.ac.ir/index.php/fid/article/view/456 https://fid.tums.ac.ir/index.php/fid/article/download/456/432

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 302 9 Gurudutt Nayak Reader, Department of Conservative Dentistry & Endodontics, Kanti Devi Dental College & Hospital, Mathura, Uttar Pradesh, India. Inderpreet Singh Assistant Professor, Department of Conservative Dentistry & Endodontics, Dasmesh Institute of Research & Dental Sciences, Faridkot, Punjab, India. Shashit Shetty Professor & Head, Department of Conservative Dentistry & Endodontics, Kanti Devi Dental College & Hospital, Mathura, Uttar Pradesh, India. Surya Dahiya Senior Resident, Dental Wing, BPS Government Medical College for Women, Sonepat, Haryana, India. 2015 10 16 Apical extrusion of debris and irrigants during cleaning and shaping of the root canal is one of the main causes of periapical inflammation and postoperative flare-ups. The purpose of this study was to quantitatively measure the amount of debris and irrigants extruded apically in single rooted canals using two reciprocating and one rotary single file nickel-titanium instrumentation systems.Sixty human mandibular premolars, randomly assigned to three groups (n = 20) were instrumented using two reciprocating (Reciproc and Wave One) and one rotary (One Shape) single-file nickel-titanium systems. Bidistilled water was used as irrigant with traditional needle irrigation delivery system. Eppendorf tubes were used as test apparatus for collection of debris and irrigant. The volume of extruded irrigant was collected and quantified via 0.1-mL increment measure supplied on the disposable plastic insulin syringe. The liquid inside the tubes was dried and the mean weight of debris was assessed using an electronic microbalance. The data were statistically analysed using Kruskal-Wallis nonparametric test and Mann Whitney U test with Bonferroni adjustment. P-values less than 0.05 were considered significant.The Reciproc file system produced significantly more debris compared with OneShape file system (P0.05). Extrusion of irrigant was statistically insignificant irrespective of the instrument or instrumentation technique used (P >0.05).Although all systems caused apical extrusion of debris and irrigant, continuous rotary instrumentation was associated with less extrusion as compared with the use of reciprocating file systems. https://fid.tums.ac.ir/index.php/fid/article/view/454 https://fid.tums.ac.ir/index.php/fid/article/download/454/430

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 310 8 Raha Habib Agahi Dentist, Private Practice, Department of Oral Medicine, Kerman Dental School, Kerman University of Medical Sciences. Nader Navabi Assistant Professor, Department of Oral Medicine, Kerman Dental School, Kerman University of Medical Sciences. Arash Shahravan Associated Professor, Kerman Oral and Dental Research Centre, Kerman University of Medical Sciences. Amirreza Ghassemi Dentist, Private Practice, Department of Oral Medicine, Kerman Dental School, Kerman University of Medical Sciences. 2015 10 16 Considering the importance of randomized clinical trials (RCTs) in the evidence-based approach, the objective of this study was critical appraisal of reporting RCTs in Iranian dental journals.After adequate searching, 113 RCT articles published during 2003-2010 were reviewed for quality of reporting with the CONSORT scale. The quality of each paper was assessed on 20.Although statistical analysis was described in 93.8%, acceptable methods for randomization and blinding were found in only 8% and 11.5% of the papers, respectively. Reasons for withdrawal were also given in just 20.4% of the articles.This study revealed that the quality of reporting RCTs in Iranian dental journals does not meet the recommended standards generally and needs to be improved. https://fid.tums.ac.ir/index.php/fid/article/view/452 https://fid.tums.ac.ir/index.php/fid/article/download/452/428

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 319 27 Ali Peimani Assistant Professor, Department of Oral Surgery, Dental School of Rafsanjan University, Rafsanjan, Iran. Farimah Sardary Assistant Professor, Department of Oral Medicine, Dental School of Rafsanjan University, Rafsanjan, Iran. 2015 10 16 Temporomandibular disorders (TMD) are clinical conditions characterized by pain and sounds of the temporomandibular joint (TMJ). This study was designed to assess the effect of low-level laser therapy (LLLT) on healing of osteoarthritis in rats with TMD.Thirty-two male Wistar rats (250-200 g) were housed in standard plastic cages. After injection of Complete Freund's adjuvant into the TMJ, rats were randomly divided into two groups of 16 (case and control) and anesthetized; then osteoarthritis was induced via intraarticular injection of 50 µl of Complete Freund's adjuvant; into the bilateral TMJs. In the case group, LLLT was done transcutaneously for 10 minutes daily, starting the day after the confirmation of osteoarthritis. Exposure was performed for 10 minutes at the right side of the TMJ with 880 nm low-level laser with 100 mW power and a probe diameter of 0.8 mm. Control rats were not treated with laser.After three days of treatment the grade of cartilage defects, number of inflammatory cells, angiogenesis, number of cell layers and arthritis in rats in the case group were not significantly different compared with controls (P>0.05). After seven days, the grade of cartilage defects, number of inflammatory cells, number of cell layers, and arthritis in the case group improved compared to controls (P https://fid.tums.ac.ir/index.php/fid/article/view/450 https://fid.tums.ac.ir/index.php/fid/article/download/450/426

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 328 34 Nahid Ramazani Assistant Professor, Children and Adolescent Health Research Center, Department of Pediatric Dentistry, Faculty of Dentistry, Zahedan University of Medical Sciences, Zahedan, Iran. Rahil Ahmadi Assistant Professor, Department of Pediatric Dentistry, Faculty of Dentistry, Shahed University, Tehran, Iran. Mansure Darijani Dentist, Zahedan University of Medical Sciences, Zahedan, Iran. 2015 10 16 Adverse effects of dental materials, especially metals, have been an important issue in recent decades.The purpose of this study was to determine the amount of nickel released from stainless steel crowns in artificial saliva.In this in-vitro study, 270 stainless steel crowns were divided into five groups, each with nine subgroups. Each group (I to V) was comprised of four, five, six, seven and eight crowns, respectively. Each subgroup was placed in a polyethylene jar containing artificial saliva and held in an incubator at 37°C for four weeks. The amount of released nickel was determined on days 1, 7, 14, 21 and 28, using an atomic absorption spectrophotometer. Wilcoxon Signed-Rank and Kruskal-Wallis with Dunn's post hoc tests (SPSS software, v. 18) were used for statistical analysis at a significance level of 0.05.The mean level of nickel on day 1 was more than that of day 7; this difference was statistically significant for all groups (P < 0.05), except for group II (P = 0.086). Also, the mean difference of released nickel between the groups was significant on day 1 (P = 0.006) and was insignificant on day 7 (P = 0.620). The nickel levels were zero on days 14, 21, and 28.The amount of nickel was below the toxic level and did not exceed the dietary intake. https://fid.tums.ac.ir/index.php/fid/article/view/448 https://fid.tums.ac.ir/index.php/fid/article/download/448/424

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 335 42 Minoo Mahshid Associate Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Allahyar Geramy Professor, Dental Research Center Dentistry Research Institute & Department of Orthodontics, Tehran University of Medical Sciences, Tehran, Iran. Massoud Ejlali Assistant Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Majid Sedaghat Monfared Assistant Professor, Prosthodontics Department, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Shirin Rezvani Habib Abadi Assistant Professor, Prosthodontics Department, Dental School,Qazvin University of Medical Sciences, Qazvin, Iran. 2015 10 16 The main goal of this study was to evaluate differences in stress distribution relevant to the number of implants under an anterior bridge when combined with a removable partial denture in the posterior region.Four three-dimensional finite element models (3D FEM) were designed from a mandible containing an implant-supported bridge extending between canines, and a bilateral distal extension removable partial denture. A nonrigid connection was selected as the attachment method between the partial denture and the anterior implant-supported fixed prosthesis; 2, 3, 4 and 5 implants supporting the bridge all with 10mm length and 3.8 mm diameter were assessed. With the aid of the finite element program ANSYS 8.0, the models were loaded and von Mises stresses were evaluated.In spongy bone, stress forces showed a decrease from 2 implants to 4 implants but showed an increase in the 5-implant model. Stresses on cortical bone of terminal implants were in similar range in the 2-, 3- and 4-implant models. While, in the 5-implant model the amount of stresses on terminal implants increased dramatically. The stresses on implants were nearly similar in all models, with the greatest amount on terminal implants.Within the limitations of this study, 2-, 3- and 4-implant models showed less stress on cortical and spongy bone in comparison with the 5-implant model. The stresses transferred to implants were nearly similar. https://fid.tums.ac.ir/index.php/fid/article/view/446 https://fid.tums.ac.ir/index.php/fid/article/download/446/422

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 343 54 Habib Ollah Ghanbari Associate Professor, Department of Periodontics, Dental Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran. Morteza Taheri Associate Professor, Department of Periodontics, Dental Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran. Salman Abolfazli Assistant Professor, Department of Periodontics, Dental Research Center, School of Dentistry, Ahvaz University of Medical Sciences, Ahvaz, Iran. Saeed Asgary Professor, Department of Endodontics, Iranian Center for Endodontic Research, Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran. Maryam Gharechahi Assistant Professor, Department of Endodontics, Dental Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran. 2015 10 16 This study aimed to compare the efficacy of MTA and CEM cement in Class II furcation defects in human mandibular molars.Forty furcation defects were treated in 16 patients with chronic periodontitis. The clinical parameters of probing depth (PD), vertical and horizontal clinical attachment levels (VCAL and HCAL), open vertical and horizontal furcation depths (OVFD and OHFD), and gingival margin level (GML) were measured at baseline and at 3- and 6-month (re-entry surgery) postoperatively. Data were analyzed at a significance level of P https://fid.tums.ac.ir/index.php/fid/article/view/444 https://fid.tums.ac.ir/index.php/fid/article/download/444/420

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 355 60 Zahra Bahrololoomi Associate Professor, Department of Pediatric Dental School, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Roya Ghafourifard Assistant Professor, Department of Pediatric Dental School, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. Ali Asghar Soleimani Assistant Professor, Department of Pediatric Dental School, Shahid Sadoughi University of Medical Sciences, Yazd, Iran. 2015 10 16 Single rooted primary mandibular first molar is a rare developmental anomaly. Literatures reveal that failure of invagination of Hertwig's epithelial root sheath leads to this unusual root form. Thorough knowledge of root canal morphology and anatomical variations of primary teeth can help a pediatric dentist in successful root canal treatment. Hereby, we describe two cases of primary mandibular first molars with an unusual morphology as a single root called pyramidal molar. https://fid.tums.ac.ir/index.php/fid/article/view/442 https://fid.tums.ac.ir/index.php/fid/article/download/442/418

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 361 4 Dana Tahririan Resident, Department of Pediatric Dentistry, Faculty of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. Alireza Eshghi Associate Professor of Pediatric Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. Pirooz Givehchian Resident, Department of Prosthodontics, Faculty of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. Mohammad Ali Tahririan Assistant Professor of Orthopedics, Isfahan University of Medical Science, Isfahan, Iran. 2015 10 16 Chondroectodermal dysplasia (Ellis-Van Creveld syndrome) is a rare autosomal recessive congenital abnormality. This syndrome is characterized by a spectrum of clinical findings, among which chondrodystrophy, polydactyly, ectodermal dysplasia, and congenital cardiac anomalies are the most common. It is imperative to not overlook the cardiac complications in patients with this syndrome during dental procedures. The case presented here, although quite rare, was detected under normal conditions and can be alarming for dental care providers. Clinical reports outline the classical and unusual oral and dental manifestations, which help health care providers diagnose chondroectodermal dysplasia, and refer patients with this syndrome to appropriate health care professionals to receive treatment to prevent further cardiac complications and bone deformities. https://fid.tums.ac.ir/index.php/fid/article/view/440 https://fid.tums.ac.ir/index.php/fid/article/download/440/416

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 365 70 Najmeh Anbiaee Associate Professor of Oral and Maxillofacial Radiology, Oral and Maxillofacial Diseases Research Center, Department of Oral and Maxillofacial Radiology, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran. Shadi Saghafi Associate Professor, Department of Oral and Maxillofacial Pathology, Oral and Maxillofacial Diseases Research Center, Depart-School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran. Maryam Mohammadzadeh Rezaei Department of Oral and Maxillofacial Radiology, School of Dentistry and Dental Research Centre, Mashhad University of Medical Sciences, Mashhad, Iran. 2015 10 16 Central granular cell odontogenic tumor) CGCOT) of the jaw is an exceedingly rare benign odontogenic neoplasm with 35 reported cases in the literature. Among these, very few studies have focused on the cone-beam CT features of CGCOT. Here, we report a case of an asymptomatic CGCOT in a 16-year-old girl and focus on the cone-beam CT features. Only 36 cases of this lesion, including this one, have been reported so far. The case presented is of special importance due to the young age of the patient, the posterior location of the lesion and the multilocular pattern in the cone beam CT images. https://fid.tums.ac.ir/index.php/fid/article/view/438 https://fid.tums.ac.ir/index.php/fid/article/download/438/414

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 11 3 2014 06 15 371 8 Hamid Razavian Assistant Professor of Endodontic, Torabinejad Dental Research Center and Department of Endodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. Alireza Haerian Resident of Orthodontics, Torabinejad Dental Research Center and Department of Orthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. Hamid Mosleh Dentist, Dental Students' Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. 2015 10 16 Many materials have been introduced for apexification each having their own advantages and disadvantages. This case report aims to present a new method of apexification using a combination of deproteinized bovine bone mineral (DBBM) and enamel matrix derivative (EMD). After irrigating the canal of the maxillary right canine with 2.5 % sodium hypochlorite, a mixture of Bio-Oss and EMD was packed into the apical region for formation of an apical barrier and the canal was obturated by thermoplastic gutta percha technique with AH26 sealer; coronal seal was achieved by resin bonded composite. The size of the periapical lesion decreased significantly after 3, 6, 12 and 18-months. The patient had no radiographic signs or clinical symptoms at 24-month follow up and complete maturation of the apex and healing of the periapical bone were achieved. https://fid.tums.ac.ir/index.php/fid/article/view/436 https://fid.tums.ac.ir/index.php/fid/article/download/436/412