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Journal of Dentistry of Tehran University of Medical Sciences

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https://www.readbyqxmd.com/read/29971131/comparison-of-short-and-standard-implants-in-the-posterior-mandible-a-3d-analysis-using-finite-element-method
#1
Allahyar Geramy, Amirreza Rokn, Abbasali Keshtkar, Abbas Monzavi, Hamid Mahmood Hashemi, Tahereh Bitaraf
Objectives: This study aimed to analyze functional stresses around short and long implant-supported prostheses with different crown heights. Materials and Methods: Four three-dimensional (3D) models were designed with SolidWorks 2015. In models 1 (control) and 2, three dental implants (second premolar 4.1×8 mm, molars: 4.8×8 mm) were placed. In models 3 and 4, three dental implants (second premolar 4.1×4 mm, molars: 4.8×4) were placed. Residual bone height was 10 mm in groups 1 and 2 (grafted bone) models and 6 mm in groups 3 and 4...
March 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971130/evaluation-of-the-prevalence-of-mucous-retention-pseudocyst-and-its-correlation-with-the-associated-risk-factors-using-panoramic-radiography-and-cone-beam-computed-tomography
#2
Mahdi Niknami, Mahdi Mirmohammadi, Azade Pezeshki
Objectives: Mucous retention pseudocyst (MRP) of the maxillary sinus is an incidental finding on radiographs. The radiographs taken for dental purposes provide an opportunity for dentists to recognize asymptomatic maxillary sinus anomalies. The purpose of this study was to determine the prevalence of MRP on panoramic and cone-beam computed tomography (CBCT) views and to evaluate the associated risk factors. Materials and Methods: In this study, 710 panoramic radiographs and 90 CBCT scans were examined with regard to the presence of MRP in the maxillary sinus during 2014-15...
March 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971129/evaluation-of-microhardness-of-mineral-trioxide-aggregate-after-immediate-placement-of-different-coronal-restorations-an-in-vitro-study
#3
Maryam Kazemipoor, Niloofar Azizi, Farnaz Farahat
Objectives: The purpose of this research was to evaluate the effect of immediate placement of different restorative materials in comparison with a temporary restoration on the surface microhardness of mineral trioxide aggregate (MTA). Materials and Methods: Access cavities were prepared in 40 extracted human molars, and a 3-mm layer of MTA was placed in the pulp chamber. The samples were divided into eight groups (n=5). Ten minutes after the MTA placement, two groups were restored with Zonalin temporary restoration, while the other six groups were restored with glass-ionomer cement (GIC), resin-modified glass-ionomer (RMGI), or resin-based composite...
March 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971128/comparative-evaluation-of-retentive-properties-of-two-compatible-ball-attachments-in-mandibular-implant-retained-overdentures-an-in-vitro-study
#4
Maryam Memarian, Simindokht Zarrati, Sedigheh Karimi, Mehran Bahrami
Objectives: The retentive properties of implant-retained overdentures (IRO) may be influenced by the type of attachments. The aim of this research was to compare the retention of two dental implant systems with compatible ball attachments, namely Straumann® system (SS) and Rhein83 SRL system (RS) after fatigue testing. Materials and Methods: Two laboratory models consisting of two parallel Straumann® fixtures at a distance of 22 mm were prepared. Five pairs of each systems' ball attachments were examined (n=5)...
March 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971127/effect-of-selected-luting-agents-on-the-retention-of-cad-cam-zirconia-crowns-under-cyclic-environmental-pressure
#5
Leyla Sadighpour, Farideh Geramipanah, Akbar Fazel, Mahdi Allahdadi, Mohammad Javad Kharazifard
Objectives: The aim of this study was to evaluate the retention strength of zirconia crowns luted with two types of resin cement under environmental pressure changes. Materials and Methods: Thirty zirconia crowns were fabricated by using computer-aided design/computer-aided manufacturing (CAD/CAM) system and were cemented by Panavia F2.0 (PAN), hand-mixed RelyX Unicem (UNH), or auto-mix RelyX Unicem Aplicap (UNA) cements on the corresponding extracted human molars...
March 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971126/efficacy-of-octacalcium-phosphate-and-octacalcium-phosphate-gelatin-composite-on-the-repair-of-critical-sized-calvarial-defects-in-rats
#6
Fereydoon Sargolzaei Aval, Mohammad Reza Arab, Narjes Sargolzaei, Fateme Noushadi, Abdolsamad Eteghadi, Asadollah Keykhaei, Foroug Sargolzaei Aval, Azim Hedayat Pour
Objectives: The healing of bone defects in the craniofacial region is an important clinical issue. We aimed to compare the effects of octacalcium phosphate (OCP) and the combination of OCP/gelatin (OCP/Gel) on calvarial bone regeneration in rats. Materials and Methods: In this study, 72 male Sprague Dawley rats were randomly assigned to the OCP (n=24), OCP/Gel (n=24), and control groups (n=24). Lesions with a diameter of 9 mm were created in the parietal bone and were filled with 9-mg OCP and OCP/Gel disks...
March 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971125/intranasal-premedication-effect-of-dexmedetomidine-versus-midazolam-on-the-behavior-of-2-6-year-old-uncooperative-children-in-dental-clinic
#7
Alireza Mahdavi, Masoud Fallahinejad Ghajari, Ghassem Ansari, Leila Shafiei
Objectives: The aim of this study was to compare the intranasal premedication effect of newly introduced dexmedetomidine (DEX) versus midazolam on the behavior of uncooperative children in the dental clinic. Materials and Methods: This crossover double-blind clinical trial was conducted on 20 uncooperative children aged 2-6 years who required at least two similar dental treatment visits. The subjects were randomly given 1 μg/kg of DEX and 0.5 mg/kg of midazolam via the intranasal route...
March 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971124/comparative-evaluation-of-the-effect-of-different-post-and-core-materials-on-stress-distribution-in-radicular-dentin-by-three-dimensional-finite-element-analysis
#8
Saied Nokar, Mehran Bahrami, Azam Sadat Mostafavi
Objectives: The aim of this study was to investigate the stress distribution of different post and core materials in radicular dentin by three-dimensional finite element analysis (3D FEA). Materials and Methods: Twelve 3D models of a maxillary central incisor were simulated in the ANSYS 5.4 software program. The models were divided into three groups; the first group included: 1-Gold post and core and 2-Nickel-chromium (Ni-Cr) post and core restored with metal-ceramic restorations (MCRs)...
March 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971123/a-new-method-of-treatment-of-temporomandibular-joint-ankylosis-with-osteodistraction-using-the-sh-device-a-case-report
#9
Gholamreza Shirani, Mahnaz Arshad, Xaniar Mahmoudi
This case report presents a 16-year-old boy with bilateral temporomandibular joint (TMJ) bony ankylosis due to trauma. The patient had undergone several unsuccessful therapeutic surgeries and was experiencing reduced mouth opening, difficulty in eating and speaking, poor oral hygiene, snoring, and depression. Bilateral gap arthroplasty and distraction osteogenesis (DO) were performed. After the surgery, we were able to move the osteodistractors forward and prevent the upward and backward movement of the proximal mandibular segment with the use of our custom-made Sh-device, which allowed bone growth and soft-tissue matching...
January 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971122/shear-bond-strength-of-rebonded-ceramic-brackets-using-four-different-methods-of-adhesive-removal
#10
Amir Hossein Mirhashemi, Mohammad Hashem Hosseini, Nasim Chiniforoush, Armin Soudi, Meisam Moradi
Objectives: Rebonding of isolated brackets is an economic option that can be conducted using available in-office or commercial recycling methods. Nowadays, lasers are known as an efficient modality for composite removal, but there is not much information available about using lasers for removal of adhesive remnants from the ceramic bracket base. Materials and Methods: Fifty human premolar teeth were divided into five groups. Samples in all groups were bonded to ceramic brackets...
January 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971121/bite-force-of-3-6-year-old-children-after-unilateral-extraction-of-primary-teeth
#11
Alireza Heydari, Yahya Baradaran Nakhjavani, Elnaz Askari Anaraki, Siavash Arvan, Maryam Shafizadeh
Objectives: This study aimed to assess the bite force of 3-6-year-old children in primary dentition period after unilateral extraction of a primary first molar (D) and its correlation with the height, weight, gender, type of occlusion, and temporomandibular disorders (TMDs). Materials and Methods: Twenty children between the ages of 3 and 6 years with a unilaterally extracted D comprised our case group, and 29 age-matched children with no extracted teeth comprised the control group...
January 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971120/modified-pedicle-grafting-a-novel-noninvasive-technique-for-soft-tissue-augmentation-around-maxillary-dental-implants
#12
Seyed Hossein Mohseni Salehi, Afshin Khorsand, Sahar Chokami Rafiei, Faris Yousif Mirkhan
Objectives: This study sought to assess the efficacy of modified pedicle grafting as a noninvasive technique for soft tissue augmentation around maxillary dental implants. Materials and Methods: This descriptive study was conducted on eight patients who met the inclusion criteria. Prior to the second-stage surgery for exposing the implants, the buccal keratinized mucosa width, vestibular depth, and mucosal thickness around the implants were measured. The same parameters were measured six months after the second-stage surgery and were compared with the baseline values...
January 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971119/effect-of-nd-yag-and-diode-lasers-on-apical-seal-of-root-canals-filled-with-ah-plus-and-mineral-trioxide-aggregate-based-sealers
#13
Elham Khoshbin, Zakiyeh Donyavi, Erfan Abbasi Atibeh, Shahin Kasraei, Rasoul Yousefimashouf, Ghodratollah Roshanaei, Faranak Amani
Objectives: Laser irradiation, as an adjunct to root canal preparation, may increase the success rate of endodontic treatments. This study aimed to assess the effect of neodymium-doped yttrium aluminum garnet (Nd:YAG) and diode lasers on the apical seal of the root canals filled with AH Plus® and mineral trioxide aggregate (MTA)-based sealers. Materials and Methods: This in-vitro experimental study was conducted on 96 single-rooted, single-canal extracted human teeth with closed apices...
January 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971118/radiographic-comparison-of-bovine-bone-substitute-alone-versus-bovine-bone-substitute-and-simvastatin-for-human-maxillary-sinus-augmentation
#14
Siamak Yaghobee, Amir Ali Reza Rasouli Ghahroudi, Afshin Khorsand, Sanaz Mahmoudi, Sahar Chokami Rafiei
Objectives: The aim of this study was to compare the efficacy of bovine bone substitute (Compact Bone B. ®) alone versus bovine bone substitute and simvastatin for human maxillary sinus augmentation. Materials and Methods: This study was conducted on 16 sinuses in eight patients. Radiographic assessments were done preoperatively (T0), immediately (T1) and at nine months after sinus grafting (T2). Alveolar bone height and density were assessed on cone beam computed tomography (CBCT) scans using Planmeca Romexis™ Imaging Software 2...
January 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971117/evaluation-of-the-effect-of-buccolingual-and-apicocoronal-positions-of-dental-implants-on-stress-and-strain-in-alveolar-bone-by-finite-element-analysis
#15
Farhood Massoumi, Mina Taheri, Abolghasem Mohammadi, Omid Amelirad
Objectives: The position of dental implants in the alveolar bone can affect the surrounding bone from biomechanical and biological aspects. The purpose of this study was to evaluate the effect of implant position on stress and strain distribution in the surrounding bone by using finite element analysis (FEA). Materials and Methods: Thirteen computerized models of a 3.8-mm-diameter XiVE implant with the abutment and crown of a mandibular second premolar in a mandibular bone segment were designed...
January 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971116/minimum-intracanal-dressing-time-of-triple-antibiotic-paste-to-eliminate-enterococcus-faecalis-atcc-29212-and-determination-of-minimum-inhibitory-concentration-and-minimum-bactericidal-concentration-an-ex-vivo-study
#16
Sholeh Ghabraei, Mohammad Marvi, Behnam Bolhari, Parisa Bagheri
Objectives: Enterococcus faecalis (E. faecalis) is the most commonly isolated microorganism from teeth with postoperative infection. Triple antibiotic paste (TAP) has the ability to eradicate microorganisms from the root canal system when used as an intracanal medicament. The aim of this study was to determine the minimum duration of application of TAP required for elimination of E. faecalis from the root canal system and its minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) in an ex-vivo model...
January 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29942331/effect-of-treatment-of-obstructive-sleep-apnea-by-uvulopalatoplasty-on-seizure-outcomes-a-case-report
#17
Gholamreza Shirani, Mahnaz Arshad, Xaniar Mahmoudi, Sergic Azarians
It is estimated that one-third of the people with refractory epilepsy suffer from obstructive sleep apnea (OSA). In a patient presenting with OSA symptoms and epilepsy, removing a portion of the soft palate (uvulopalatoplasty) can be considered the treatment of choice for eliminating the OSA and decreasing the seizures. Here, we report the results of our surgical approach by which the patient's problems completely resolved, and we observed no symptoms of OSA or epilepsy after the surgery. After 10 years of follow-up, the patient is seizure-free and does not need any antiepileptic drugs...
November 2017: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29942330/application-of-multilevel-models-in-dentistry
#18
REVIEW
Mohammad Javad Kharazifard, Kurosh Holakouie-Naieni, Mohammad Ali Mansournia
Multilevel analysis which was primarily introduced to deal with hierarchical data was later applied extensively for research in other fields of science and not only for nested data, but also for repeated measurements or clustered trials. This method of statistical analysis was applied in dental studies in the 1991 for the first time but despite its value for data analysis in dental studies, its application for dental studies remains limited until now. This manuscript reviews the applications of this method in dental studies...
November 2017: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29942329/effect-of-flapless-immediate-implantation-and-filling-the-buccal-gap-with-xenograft-material-on-the-buccal-bone-level-a-randomized-clinical-trial
#19
Mojgan Paknejad, Solmaz Akbari, Hoori Aslroosta, Mehrdad Panjnoush, Samira Hajheidary
Objectives: Following tooth extraction, soft and hard tissue alterations occur; Different factors can affect this process. The objective of this study was to determine the effect of gap filling on buccal alveolar crestal bone level after immediate implant placement after 4- to 6-month observation period. Materials and Methods: This randomized clinical trial was performed on 20 patients (mean age of 38.8 years) requiring tooth extraction in a total of 27 areas in the anterior maxilla...
November 2017: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29942328/adherence-of-streptococcus-mutans-to-microhybrid-and-nanohybrid-resin-composites-and-dental-amalgam-an-in-vitro-study
#20
Fariba Motevasselian, Ensieh Zibafar, Esmail Yassini, Mansoreh Mirzaei, Naser Pourmirhoseni
Objectives: Streptococcus mutans ( S. mutans ) is a cariogenic microorganism. The restorative materials which harbor a biofilm with high levels of S. mutans can accelerate the occurrence of dental caries. The purpose of this study was to evaluate the influence of different restorative materials on S. mutans colonization in a simple in-vitro biofilm formation model. Materials and Methods: Thirteen discs of each material (nanohybrid resin composite, microhybrid resin composite, and amalgam) were prepared, polished, and sterilized in a gamma radiation chamber...
November 2017: Journal of Dentistry of Tehran University of Medical Sciences
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