Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 16 4 2019 01 30 319 324 EN Somayeh Allahyari Department of Dental Technology, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran 2018 08 22 2018 12 05 Cranial radiotherapy has several side effects. One of the most important complications is radiation caries that endangers the treatment prognosis. In the literature, the use of crowns and bridges for irradiated patients has been suggested as a contraindication. In addition, due to the risk of osteoradionecrosis (ORN), there are doubts about tooth extraction and implant placement. Here, we present a treatment sequence and recalls for an irradiated young patient. For irradiated patients, it is recommended to replace teeth with implants when there is no possibility for supragingival prosthetic margin. https://fid.tums.ac.ir/index.php/fid/article/view/2793 https://fid.tums.ac.ir/index.php/fid/article/download/2793/1772

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 16 4 2019 05 29 239 247 EN Zohre Sadat Hosseinipour Department of Pedodontics, Faculty of Dentistry, AJA University of Medical Sciences, Tehran, Iran Alireza Heidari Department of Pediatric Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Mehdi shahrabi Department of Pediatric Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Kiana Poorzandpoush Department of Pedodontics, Faculty of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran 2018 06 12 2018 10 10 Objectives: Application of fissure sealants is a practical method for prevention of occlusal pit and fissure caries. Microleakage is an important factor affecting the success of fissure sealant treatment. This study aimed to assess the microleakage of a self-adhesive flowable composite, a self-adhesive fissure sealant and a conventional fissure sealant in permanent teeth with/without saliva contamination. Materials and Methods: This in vitro, experimental study evaluated 108 extracted human third molars, which were randomly divided into six groups (n=18) of control, Denu-Seal conventional fissure sealant applied on etched enamel with/without saliva contamination, Vertise Flow self-adhesive flowable composite applied on rinsed and dried enamel with/without saliva contamination and Prevent Seal self-adhesive fissure sealant applied on rinsed and dried enamel with/without saliva contamination. Microleakage was assessed using the dye penetration technique and subsequent observation of samples under a stereomicroscope. Data were analyzed using the Kruskal-Wallis and Tukey’s test. Results: Microleakage of the conventional fissure sealant with/without saliva contamination was significantly lower than that of other groups (P<0.05). Conclusion: Microleakage of the conventional fissure sealant is less than that of self-adhesive fissure sealant and self-adhesive composite, irrespective of saliva contamination. https://fid.tums.ac.ir/index.php/fid/article/view/2613 https://fid.tums.ac.ir/index.php/fid/article/download/2613/1763

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 16 4 2019 05 29 248 255 EN Nasrin Farhadian Department of Orthodontics, Dental Faculty, Hamedan University of Medical Sciences, Hamadan, Iran Amirfarhang Miresmaeili Department of Orthodontics, Dental Faculty, Hamedan University of Medical Sciences, Hamadan, Iran Vahid Shahidi Zandi Department of Orthodontics, Dental Faculty, Hamedan University of Medical Sciences, Hamadan, Iran 2018 07 06 2018 08 28 Objectives: The purpose of this randomized clinical trial (RCT) was to compare the shear bond strength (SBS) of orthodontic brackets bonded to enamel with conventional acid-etch (AE) technique and self-etching primers (SEP). Materials and Methods: Twenty-two patients, requiring extraction of two bicuspids for orthodontic reasons, were recruited. In each individual, following blinding and allocation concealment, one intact premolar received conventional AE, whereas the contralateral premolar received SEP with a split-mouth design. Bonded brackets remained in the oral cavity for two months. Afterward, the teeth were extracted without debonding the brackets. SBS and adhesive remnant index (ARI) were measured using a Universal Instron machine and a stereomicroscope, respectively. Results: The mean SBS of the conventional AE and SEP groups was 9.53 and 9.20 MPa, respectively. Paired t-test showed no statistically significant difference between the two groups (P=0.096). Comparison of ARI between the two groups, using Wilcoxon test, indicated that significantly less adhesive remained on enamel with brackets bonded with SEP compared to brackets bonded with conventional AE (P<0.001) although the SBS was higher in the AE group. Conclusion: The present study indicated that although there is no significant difference in SBS between SEP and conventional AE for bonding orthodontic metal brackets, the amount of residual adhesive on the enamel surface is significantly less with SEP than with conventional AE. (IRCT registration number: IRCT201705099086N3). https://fid.tums.ac.ir/index.php/fid/article/view/2697 https://fid.tums.ac.ir/index.php/fid/article/download/2697/1764

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 16 4 2019 05 29 256 264 EN Arash Mansourian Department of Oral and Maxillofacial Medicine, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran. AND Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran Sara Pourshahidi Department of Oral and Maxillofacial Medicine, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Maryam-Sadat Sadrzadeh-Afshar Oral and Maxillofacial Medicine Department, Faculty of Dentistry, AJA University of Medical Sciences, Tehran, Iran Hooman Ebrahimi Oral and Maxillofacial Medicine Department, Faculty of Dentistry, Islamic Azad University of Medical Sciences, Tehran, Iran 2018 07 30 2019 02 27 Objectives: Myofascial pain dysfunction syndrome (MPDS) is the most common form of temporomandibular disorders. Because of the multifactorial nature of the problem, its management usually involves several treatment modalities to maximize their synergistic effects. This randomized clinical trial aimed to assess the efficacy of low-level laser therapy (LLLT) and transcutaneous electrical nerve stimulation (TENS) as an adjunct to pharmaceutical therapy for treatment of MPDS. Materials and Methods: This clinical trial evaluated 108 MPDS patients. First, the initial pain intensity of patients was determined using a visual analogue scale (VAS). The first phase of the study included education, awareness, self-care, behavior and relaxation therapy. After 1 month, the pain score was measured again using VAS. Patients who acquired a pain score >1 were divided into three groups of LLLT with diode (GAAlAr) laser with 0.2 W power, TENS, and control, using block randomization. All groups received 10 mg fluoxetine once daily, 0.25 mg clonazepam once daily and 10 mg baclofen three times a day. ANOVA was used to compare the recovery rate of the three groups. Results: Pain in the trapezius muscle and pain on mouth opening resolved faster in the laser + medication group. The recovery rate was faster in the mean muscle pain, general pain reported by patients, pain in the masseter and pterygoid muscles and pain and limitation in lateral movements in both laser + medication and TENS groups. Conclusion: Combination of LLLT and TENS with medication accelerated pain relief and resolved movement restrictions in MPDS patients. https://fid.tums.ac.ir/index.php/fid/article/view/2749 https://fid.tums.ac.ir/index.php/fid/article/download/2749/1765

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 16 4 2019 05 29 265 271 EN Sara Valizadeh Laser Research Center of Dentistry, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran. AND Department of Restorative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Aida Moradi Post graduate Student, Operative Dentistry Department, Dental School, Tehran University of Medical Sciences, Tehran, Iran Mansoureh Mirzaei Department of Restorative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Hooman Amiri Department of Restorative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Mohammad Javad Kharazifard Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran 2018 08 22 2019 03 01 Objectives: The aim of this study was to compare the microshear bond strength (µSBS) of various adhesive systems to dentin. Materials and Methods: In this in vitro experimental study, 60 sound human third molars were divided into four groups. Dentin discs were prepared of middle-third dentin measuring 4 mm in diameter and 2 mm in thickness. Dentin surfaces were bonded with one of the four types of adhesives: (A) Single Bond (3M ESPE), Scotchbond Universal (3M ESPE) in etch and rinse (B) and self-etch (C) modes and (D) Clearfil SE Bond (Kuraray Noritake Dental). After the application of adhesive systems according to the manufacturers’ instructions, composite cylinders (Vit-l-escence) were bonded to dentin surfaces. The μSBS test was performed using a universal testing machine at a crosshead speed of 1 mm/min. Data were analyzed with one-way ANOVA and Tukey’s test (α=0.05). Results: The µSBS was the highest in self-etch Scotchbond Universal (15.8±6.08 MPa) followed by Clearfil SE Bond (15.24±4.6 MPa), etch and rinse Scotchbond Universal (11.68±4.07MPa) and Single Bond (11.24±3.74 MPa). A significant difference was only found between Single Bond and etch and rinse Scotchbond Universal groups (P=0.04). Conclusion: Based on the results of this study, application of Scotchbond Universal in self-etch mode provides a reliable bond to dentin. https://fid.tums.ac.ir/index.php/fid/article/view/2785 https://fid.tums.ac.ir/index.php/fid/article/download/2785/1766

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 16 4 2019 12 22 272 278 Pegah Sarraf Department of Endodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Nazanin Kiomarsi Department of Restorative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Farrokh Haj Taheri Private Practice, Tehran, Iran Behrang Moghaddamzade Department of Oral and Maxillofacial Radiology, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Fatemeh Dibaji Department of Endodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Mohammad Javad Kharazifard Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran 2018 09 29 2019 08 03 Objectives: This study aimed to compare the transportation of the mesiobuccal canal of maxillary molars following root canal preparation with HyFlex CM (HCM) and Edge Taper Platinum (ETP) rotary systems and stainless steel (SS) hand files using cone-beam computed tomography (CBCT). Materials and Methods: This in-vitro study was performed on 48 maxillary molars in three groups of 16. The teeth were mounted in acrylic blocks, and root canals were prepared using HCM in group 1 (up to #30/0.06), ETP in group 2 (up to F3/0.06), and SS hand files in group 3 (up to #30). CBCT scans were taken before and after root canal preparation. The amount of canal transportation was measured at 0, 3, 6, and 9mm from the apex. Data were analyzed using Kruskal-Wallis and Mann-Whitney tests. Results: The difference in canal transportation at 0 and 6mm from the apex was significant between the HCM and ETP groups (P=0.031 and 0.023) but none of the systems showed any significant difference with hand files at 0- and 6-mm levels (P=0.10, 0.56, 0.22, and 0.50), respectively. At 3mm from the apex, no significant difference was noted among the groups (P=0.30). At the 9-mm level, the amount of canal transportation was not significantly different between HCM and ETP (P=0.83) but they showed significant differences with hand files (P<0.001). Conclusion: ETP and HCM caused less canal transportation at the curvature of the mesiobuccal canal of maxillary molars compared to hand files. ETP showed superior efficacy in root canal preparation compared to HCM. https://fid.tums.ac.ir/index.php/fid/article/view/2851 https://fid.tums.ac.ir/index.php/fid/article/download/2851/1770

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 16 4 2019 05 29 279 289 Seyed Alireza Parhiz Department of Oral and Maxillofacial Surgery, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Pegah Bakhtiary Department of Oral and Maxillofacial Surgery, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Farzaneh Mosavat Department of Oral and Maxillofacial Radiology, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Mohammad Javad Kharazi Fard Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran 2018 11 18 2019 05 21 Objectives: This study sought to assess the thickness of buccal and lingual alveolar bone plates according to the position of impacted mandibular third molars on cone-beam computed tomography (CBCT) scans. Materials and Methods: Eighty-four CBCT scans of impacted mandibular third molars were evaluated in this retrospective study. All images had been obtained by ProMax 3D CBCT system with the exposure settings of 78 kVp, 12 mA, 16 s time, 0.2 mm voxel size and 10 × 9 cm field of view. The impaction angle of teeth and the thickness of buccal and lingual cortical plates were determined on images by drawing lines in the anterior, middle, posterior, superior, central and inferior regions. Thickness of bone plates was analyzed according to the position of impacted molars relative to th/Journal> 3947 3947 Harpreet Singh Department of Orthodontics and Dentofacial Orthopedics ESIC Dental College and Hospital, Sector 15, Rohini, Delhi, India Shabina Sachdeva Department of Prosthodontics Faculty of Dentistry, Jamia Milia Islamia, Delhi, India Dhirendra Srivastava Department of Oral and Maxillofacial SurgeryESIC Dental College and Hospital, Sector 15, Rohini, Delhi, India Pranav Kapoor Department of Orthodontics and Dentofacial Orthopedics, ESIC Dental College and Hospital, Sector 15, Rohini, Delhi, India Poonam Sharma Department of Orthodontics and Dentofacial Orthopedics, ESIC Dental College and Hospital, Sector 15, Rohini, Delhi, India Raj Kumar Maurya Dental Officer & Specialist (Orthodontics), Central Government Dental Unit, Nagaland, India Pinaki Roy Department of Orthodontics and Dentofacial Orthopedics, Dr. R. Ahmed Dental College and Hospital, Kolkata, India 2021 01 29 2021 06 11 This integrative review aims to provide a consolidated evidence-based appraisal of the most up-to-date guidelines and recommendations of international public and professional health regulatory bodies in relation to preparedness framework for restructuring safe delivery of dental services amid and beyond the coronavirus disease-2019 (COVID-19) pandemic. Most recent updated guidelines for dental professionals from major international health regulatory bodies were reviewed. PubMed, Google Scholar, Cochrane Central Register of Controlled Trials, WHO COVID-19 and LILACS databases, along with relevant preprints were searched, and citations were checked up to January 23, 2021. The search was performed by one author. Shortlisted articles were read and brought to consensus to be included in the study by at least two co-authors. In case of any disagreement between the judgements, an independent co-author’s decision was taken as final. Of 849 records searched, 61 articles were included in the study. Following content analysis of the global guidelines and the collected prevailing evidence, the common themes and recommendations of different guidance documents were collated and summarized into seven domains. Most guidelines have a consensus regarding implementation of rigorous administrative, engineering and environmental infection control strategies. However, variations do exist with regard to the use of respirators in non-aerosol-generating procedure (non-AGP) settings, employment of airborne precautions during non-AGPs, use of supplemental air-handling systems, and preoperative use of mouthwashes. This evidence-based analysis can serve as a useful reopening resource tool and facilitate effective restructuring for delivery of optimal, equitable and safe dental practices globally, during and while emerging from the pandemic. https://fid.tums.ac.ir/index.php/fid/article/view/3947

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 19 0 2022 08 10 3897 3897 Hoorieh Bashizadehfakhar Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran AND Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran. Mehrdad Panjnoush Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran. Yasaman Kheirandish Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran. Azin Sedaghati Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Ilam University of Medical Sciences, Ilam, Iran. Faeze Mirjalili Department of Dentomaxillofacial Radiology, Faculty of Dentistry, Kashan University of Medical Sciences, Kashan, Iran Sara Aliasghari Abandansari Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran 2020 12 25 2021 05 01 Congenital diffuse infiltrating lipomatosis of the face (CDIL-F) is a rare clinicopathological entity with an unknown etiology, in which mature adipose tissue infiltrates the soft tissue structures in one side, and causes considerable asymmetry. Herein, we report a case of CDIL-F who underwent many surgical procedures without definite diagnosis during 12 years.  CDIL-F presents symptoms with various severity levels due to infiltration of adipose tissue that makes removal difficult. Thus, it is recommended to inform patients about the high rate of recurrence. https://fid.tums.ac.ir/index.php/fid/article/view/3897

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 19 0 2022 01 25 3591 3591 Nastaran Sharifi Department of Orthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Zahra Mohammadi Department of Endodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Sepideh Arab Department of Orthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Maryam Shojaee Department of Restorative Dentistry, Qazvin University of Medical Sciences, Qazvin, Iran Fatemeh Vafadoost School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Azadeh Zakerzadeh Dental Caries Prevention Research Center, Qazvin University of Medical Sciences, Qazvin, Iran 2020 05 15 2021 01 02 Objectives: The purpose of this study was to evaluate the effect of saliva contamination on shear bond strength (SBS) of orthodontic brackets bonded by a self-adhering composite compared with a conventional adhesive. Materials and Methods: This in vitro, experimental study investigated 40 human premolars. The teeth were randomly divided into four groups based on the adhesive type and bonding condition: (I) Vertise Flow composite without saliva contamination (VF), (II) Vertise Flow composite with saliva contamination (VF/S), (III) Transbond XT composite without saliva contamination (TXT), and (IV) Transbond XT composite with saliva contamination (TXT/S). After the preparation step, brackets were bonded to the buccal surface of the teeth, and samples were mounted in acrylic blocks, incubated at 37°C for 24 hours, and underwent thermocycling between 5- 55°C. Next, the SBS was measured by a universal testing machine. Data were analyzed by ANOVA and Tukey’s test.  P<0.05 was considered statistically significant. Results: ANOVA showed a significant difference in SBS among the groups (P<0.001). The highest SBS was achieved in the TXT group (26.63±9.09 MPa), followed by TXT/S (13.69±4.23 MPa), VF/S (3.68±1.49 MPa), and VF (3.04±1.73 MPa). Conclusion: Saliva contamination did not have a significant effect on SBS of brackets bonded with Vertise Flow. However, it did not provide acceptable bond strength for orthodontic bracket bonding in the clinical setting. https://fid.tums.ac.ir/index.php/fid/article/view/3591

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 19 0 2022 06 28 3900 3900 Janaki Ramya NAMBURU SIBAR Institute of Dental Sciences Guntur, Andhra Pradesh, India. Arvind Babu RAJENDRA SANTOSH School of Dentistry, Faculty of Medical Sciences The University of the West Indies Jamaica, West Indies Chandra Shekar POOSARLA Department of Oral and Maxillofacial Pathology SIBAR Institute of Dental Sciences Guntur, Andhra Pradesh, India. Suvarna MANTHAPURI Department of Dentistry Government Medical College, Nalgonda, Telangana, India. Mythri PINNAKA SIBAR Institute of Dental Sciences Guntur, Andhra Pradesh, India. Venkat Ramana Reddy BADDAM Department of Oral and Maxillofacial Pathology SIBAR Institute of Den