Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 16 6 2020 06 24 407 414 EN Ebrahim Yarmohammadi Department of Operative Dentistry, Hamedan University of Medical Sciences, Hamadan, Iran Shahin Kasraei Department of Operative Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran Yasaman Sadeghi Department of Operative Dentistry, Gilan University of Medical Sciences, Rasht, Iran 2018 09 11 2019 12 07 Objectives: It has been reported that bulk-fill composites simplify tooth restoration with no adverse effect on the success rate. This study sought to assess the cuspal deflection of premolars with mesio-occluso-distal (MOD) cavities restored with bulk-fill and conventional posterior composite resins. Materials and Methods: This in-vitro experimental study was conducted on 64 human maxillary premolars. MOD cavities were prepared on teeth and restored with Filtek P60 conventional composite and Filtek Bulk Fill flowable, X-tra fill, and X-tra base bulk-fill composites in four groups (n=16). Distance between the cusp tips was measured before, five minutes, 24 hours, 48 hours, and one week after restoration. The data were analyzed using repeated-measures analysis of variance (ANOVA) and Tukey’s test (α=0.05). Results: The mean±standard deviation (SD) of cuspal deflection at five minutes after the restoration was 13.5±5.3, 12.2±3.5, 11.3±4.4, and 10.4±3.7 µm for Filtek P60, Filtek Bulk Fill, X-tra fill, and X-tra base, respectively. ANOVA showed that bulk-fill composites did not cause a significant reduction in cuspal deflection compared to P60 (P>0.05). Cuspal deflection in all groups significantly decreased with time (P<0.05). Conclusion: Bulk-fill composites have no superiority over P60 in the reduction of cuspal deflection. The cuspal deflection was variable at different time points in all groups and decreased over time. https://fid.tums.ac.ir/index.php/fid/article/view/2804 https://fid.tums.ac.ir/index.php/fid/article/download/2804/1783

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 16 6 2020 06 24 473 477 Hassan Mirmohammadsadeghi Department of Oral and Maxillofacial Surgery, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran Farzad Aghdashi Department of Oral and Maxillofacial Surgery, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran Golnaz Nahvi Department of Orthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran Mohammad Esmaeelinejad Department of Oral and Maxillofacial Surgery, Dental School, Semnan University of Medical Sciences, Semnan, Iran 2019 07 16 2019 12 01 Mandibular defects due to surgical resection of pathologies are common challenges for maxillofacial surgeons. In some clinical situations, alteration or combination of different surgical procedures is needed to reduce the size of bony defects and improve the success rate of bone grafts. In the current study, an 18-year-old female with a pathological lesion (ameloblastoma) in the mandible is presented. After tumor resection, bony defect reconstruction with autogenous bone graft was combined with a mandibular setback to facilitate the procedure. In this case, the simultaneous combination of orthognathic mandibular setback movement with tumor resection in a single surgical session helped to reduce the bony defect size. The adoption of this approach led to a decrease in the volume of graft harvesting and improved the success rate of the grafting procedure. https://fid.tums.ac.ir/index.php/fid/article/view/3232 https://fid.tums.ac.ir/index.php/fid/article/download/3232/1791

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 16 6 2020 06 24 415 420 EN Behnoosh Jalalian Department of Restorative Dentistry, Faculty of Dentistry, Qom University of Medical Sciences, Qom, Iran Parisa Golkar Dental Materials Research Center, Department of Operative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran Alireza Paktinat Private Practice, Tehran, Iran Elham Ahmadi Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran Seyed Ali Panahande Department of Restorative Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Ladan Ranjbar Omrani Dental Research Center, 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 2018 07 04 2018 10 19 Objectives: Hydroxyapatite (HA) nanoparticles are used to improve the physical and mechanical properties of glass ionomers (GIs). This study aimed to assess the effect of addition of different weight percentages of nano-HA on degree of conversion (DC) of Fuji II LC GI cement using a spectrometer. Materials and Methods: In this in vitro experimental study, 30 samples were fabricated of Fuji II LC (improved) GI cement in six groups (n=5) containing 0%, 1%, 2%, 5%, 7% and 10wt% nano-HA. The obtained paste in each group was subjected to Fourier-transform infrared spectroscopy (FTIR) before curing to assess the monomer to polymer DC percentage. The paste was then light-cured and underwent FTIR again. One-way ANOVA was applied to compare the DC percentage of different groups. Pairwise comparisons were performed using the Tukey’s test. Results: The DC was 57.88±0.57% in 0%, 60.04±0.63% in 1%, 66.92±0.54% in 2%, 65.5±0.71% in 5%, 51.49±0.24% in 7% and 50.09±0.32% in 10% nano-HA group. The difference in DC among the groups was statistically significant (P<0.0001). The highest DC was noted in 2% nano-HA and the lowest DC was found in 10% nano-HA group. Pairwise comparisons revealed significant differences between the groups in DC (P<0.0001). Conclusion: Increasing the weight percentage of nano-HA to 2% increased the DC but increasing the nano-HA weight percentage over 5% decreased the DC of resin-modified glass ionomer cement (RMGIC). The highest DC was noted in 5w% and 2w% nano-HA groups. Thus, 5w% and 2w% nano-HA can be used to improve the DC of RMGIC. https://fid.tums.ac.ir/index.php/fid/article/view/2685 https://fid.tums.ac.ir/index.php/fid/article/download/2685/1784

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 16 6 2020 06 24 478 483 Fatima Balaghi Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran. AND Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Mahya Hasanzade Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran. AND Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Hamid Mahmood Hashemi Department of Oral and Maxillofacial Surgery, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Simindokht Zarati Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran. AND Department of Prosthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran 2018 09 28 2019 08 21 The present clinical report describes the fabrication of an implant-retained prosthesis with bar and clip retention for a patient with total rhinectomy due to basal cell carcinoma (BCC). The nasal prosthesis was retained on the face by a reverse Y-shaped bar with horizontal and vertical extensions, resulting in favorable retention and function. https://fid.tums.ac.ir/index.php/fid/article/view/2849 https://fid.tums.ac.ir/index.php/fid/article/download/2849/1794

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 16 6 2020 06 24 421 428 Bahman Seraj Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran Ghasem Meighani Department of Pediatric Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Shabnam Milani Department of Pediatric Dentistry, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Mostafa Fatemi Department of Dental Biomaterials, Shahid Beheshti University of Medical Sciences, Tehran, Iran 2019 04 30 2020 02 12 Objectives: Considering the importance of timesaving in pediatric dentistry, if the efficacy is achieved along with shorter working time and less technical sensitivity, the behavior management of young patients can be anticipated. This study aimed to compare the effect of precuring and postcuring of total-etch and self-etch bonding agents on the microleakage of sealants. Materials and Methods: This study was conducted on forty impacted third molars, which were surgically extracted. The samples were divided into five groups: 1. Control (etching and sealant), 2. Precured fifth-generation bonding agent (Adper Single Bond 2) and fissure sealant, 3. Postcured fifth-generation bonding agent (Adper Single Bond 2) and fissure sealant, 4. Precured seventh-generation bonding agent (Single Bond Universal) and fissure sealant, and 5. Postcured seventh-generation bonding agent (Single Bond Universal) and fissure sealant. All specimens were thermocycled (×1000), immersed in 0.5% basic fuchsine solution for 24 hours, sectioned, digitally photographed, and measured using the LAS EZ program. The data were analyzed using Kruskal-Wallis and Dunn’s tests. Results: Leakage in the control group and the third group was significantly lower than that in other groups. In pairwise comparisons, a significant difference was found between the control group and the fifth group and between the third group and the fifth group. Conclusion: The conventional method of sealant placement showed superior results in comparison with the use of an intermediate layer of the bonding agent. https://fid.tums.ac.ir/index.php/fid/article/view/3123 https://fid.tums.ac.ir/index.php/fid/article/download/3123/1785

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 16 6 2020 06 24 429 435 Arash Dabbaghi Department of Oral and Maxillofacial Radiology, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran Sanaz Sharifi Department of Oral and Maxillofacial Radiology, School of Dental Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran Masoud Esmaeili Department of Oral and Maxillofacial Radiology, Faculty of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran 2018 10 08 2019 07 31 Objectives: Cone-beam computed tomography (CBCT) is used in diagnostic situations, as well as tooth impaction and its complications. A possible sequela of tooth impaction is resorption of adjacent teeth, complicating the treatment plans. This study aimed to determine the diagnostic accuracy of high- and low-resolution CBCT scans in the detection of external root resorptions (ERRs), caused by an adjacent impacted tooth in the cementoenamel junction (CEJ), mid-root, and apical areas. Materials and Methods: Forty-five intact single-rooted teeth were divided into three groups of 15. Each group was dedicated to each zone of the root. Slight, moderate, and severe ERRs were formed, and CBCT scans were taken before and after the formation of ERRs. The diagnostic accuracy was assessed, and the Proportion test was used to compare the results. Results: The statistical analyses of high- and low-resolution images showed a significant difference (P<0.05), which implies the higher accuracy of high-resolution images. The highest diagnostic accuracy among different zones was related to the mid-root, and the lowest was related to the apical zone. In terms of the size of ERRs, the diagnostic accuracy was the lowest for slight ERRs. Conclusion: The most reliable and accurate diagnostic mode was found in high-resolution images, in the mid-root zone, and with severe ERRs. The lowest diagnostic accuracy was found in low-resolution images, in the apical zone, and with slight ERRs. https://fid.tums.ac.ir/index.php/fid/article/view/2870 https://fid.tums.ac.ir/index.php/fid/article/download/2870/1786

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 16 6 2020 06 24 436 449 EN Koduri Sridevi Department of Oral Medicine and Radiology, Lenora Institute of Dental Sciences, Rajahmundry, Andhra Pradesh, India Saka Malathi Department of Oral Medicine and Radiology, Army College of Dental Sciences, Secunderabad, Telangana, India Chalapathi KV Department of Oral Pathology and Microbiology, Care Dental College and Hospital, Guntur, Andhra Pradesh, India Chowdary Nagarjuna G Department of Pedodontics and Preventive Dentistry, MNR Dental College and Hospital, Sangareddy, Telangana, India M Gayathri Department of Oral Medicine and Radiology, Adhiparasakthi Dental College and Hospital, Melmaruvathur, Tamilnadu, India G Eswar Chand Medical Graduate, Mamata Medical College, Khammam, Telangana, India Abhishek Nayyar Department of Oral Medicine and Radiology, Saraswati Dhanwantari Dental College and Hospital and Post-graduate Research Institute, Parbhani, Maharashtra, India 2018 01 06 2018 07 20 Objectives: The present study aimed to evaluate CD4 cell counts, lipid profile, and oral manifestations in human immunodeficiency virus (HIV)-infected and acquired immune deficiency syndrome (AIDS) patients and their correlation with seronegative controls. Materials and Methods: In this cross-sectional, hospital-based study, there were three groups of subjects: group A consisting of 500 healthy patients (controls), group B composed of 500 HIV-infected patients, and group C comprised of 500 AIDS patients based on their CD4 cell counts. CD4 cell counts were assessed using the CyFlow counter. Lipid /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