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Journal of Dentistry of Tehran University of Medical Sciences

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https://www.readbyqxmd.com/read/30090120/multidisciplinary-management-of-complicated-crown-root-fracture-a-case-report
#1
Zahra Enshaei, Maede Ghasemi
The management of traumatic dental injuries as well as crown-root fractures is always challenging in everyday general dental practice. A number of treatment modalities are available for crown-root fractures, depending on the position, extent and severity of the fracture. The aim of this case report was to describe a clinical case of rehabilitation of a complicated crown-root fracture of the maxillary left central incisor, successfully treated by a multidisciplinary approach including orthodontic extrusion. The final result was esthetically pleasant and periodontally sound in the follow ups...
May 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30090119/restoring-a-partial-maxillectomy-patient-by-an-implant-supported-obturator-on-two-implants-a-case-report
#2
Elaheh Beyabanaki, Marzieh Alikhasi
This article describes the prosthetic treatment of a patient suffering from a hemimaxillary defect after surgical resection of an adenoid cystic carcinoma (ACC) in the palate. The patient had also received therapeutic irradiation. One year after radiotherapy, three implants were placed in the remaining maxillary bone without any bone augmentation. One of the implants failed during the osseointegration period. The implant replacing the failed one also failed during prosthetic procedures. The patient was unwilling to undergo another surgical episode, and the final prosthesis was completed on the two remaining implants...
May 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30090118/thermal-changes-of-root-surface-of-anterior-primary-teeth-in-pulpectomy-with-er-yag-laser
#3
Zahra Bahrololoomi, Reza Birang, Nasim Chiniforush, Hazhir Yousefshahi, Elnaz Foroughi
Objectives: Successful root treatment depends on elimination of microorganisms from the root canal. Considering incomplete removal of bacteria from the canal by usual methods, lasers have been suggested as a new modality. Despite their anti-bacterial properties, lasers can cause thermal changes. This study assessed the thermal changes of root surface in pulpectomy of primary teeth following the use of Er:YAG laser. Materials and Methods: Sixty primary anterior teeth were collected and prepared by K-file up to number 50...
May 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30090117/inhibitory-effects-of-antimicrobial-photodynamic-therapy-with-curcumin-on-biofilm-associated-gene-expression-profile-of-aggregatibacter-actinomycetemcomitans
#4
Maryam Pourhajibagher, Nasim Chiniforush, Abbas Monzavi, Hamidreza Barikani, Mohammad Moein Monzavi, Shaghayegh Sobhani, Sima Shahabi, Abbas Bahador
Objectives: Periodontitis is an inflammation of periodontal tissues that is caused by the biofilm of periodontal pathogens. Aggregatibacter actinomycetemcomitans ( A. actinomycetemcomitans ) is an opportunistic periodontopathogen that can be the cause of periodontal diseases via fimbriae as a virulence factor. In this study, we aimed to determine the expression level of A. actinomycetemcomitans rcpA gene as a virulence factor associated with biofilm formation after antimicrobial photodynamic therapy (aPDT) as a relatively new therapeutic modality...
May 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30090116/two-dimensional-analysis-of-the-size-of-nasopharynx-and-adenoids-in-non-syndromic-unilateral-cleft-lip-and-palate-patients-using-lateral-cephalograms
#5
Sarvin Sarmadi, Javad Chalipa, Behrad Tanbakuchi, Maryam Javaheri Mahd, Maryam Nasiri, Mohammad Reza Mehtari
Objectives: Cleft lip and palate (CLP) is the most common congenital anomaly of the head and neck region. The upper airway in CLP patients is affected by retarded maxillary growth. Small size of the nasopharynx can also lead to mouth breathing. This study aimed to compare the size of nasopharynx and adenoids in non-syndromic unilateral CLP (NSUCLP) patients and healthy controls two-dimensionally on lateral cephalograms. Materials and Methods: This retrospective study was performed on 30 children with NSUCLP (mean age of 11...
May 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30090115/comparison-of-antimicrobial-effects-of-triple-antibiotic-paste-and-calcium-hydroxide-mixed-with-2-chlorhexidine-as-intracanal-medicaments-against-enterococcus-faecalis-biofilm
#6
Sholeh Ghabraei, Behnam Bolhari, Mohammad Marvi Sabbagh, Mahsa Sobhi Afshar
Objectives: The purpose of this in-vitro study was to determine and compare the shortest period needed for a triple antibiotic paste (TAP) and calcium hydroxide (Ca(OH)2 ) plus 2% chlorhexidine (CHX) to eradicate the biofilm of Enterococcus faecalis (EF) from the root canal system. Materials and Methods: Sixty-five extracted single-rooted human teeth with straight root canals were selected. The crowns were cut from the cementoenamel junction (CEJ), and canal preparations were done by step-back technique...
May 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30090114/effect-of-resin-cement-color-on-the-final-color-of-lithium-disilicate-all-ceramic-restorations
#7
Fariborz Vafaee, Bijan Heidari, Masoumeh Khoshhal, Amirarsalan Hooshyarfard, Mahmoud Izadi, Armaghan Shahbazi, Abbas Moghimbeigi
Objectives: Obtaining an adequate ceramic thickness to mask the substructure color is not always feasible, and appropriate use of a cement may be the only solution. This study aimed to evaluate the effect of the color of Variolink II resin cement on the final color of lithium disilicate glass ceramic restorations. Materials and Methods: In this in-vitro study, 90 discs of IPS e.max Press ceramic were evaluated. The ceramic discs were cemented to composite and amalgam blocks...
May 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30090113/effect-of-cosmetic-ceramics-on-fracture-toughness-of-all-ceramic-restorations
#8
Sibel Cetik, Marion Vincent, Ramin Atash
Objectives: The use of zirconia as a framework for prosthetic restorations is increasing due to its favorable mechanical properties. Zirconia also has remarkable aesthetic properties when used as a framework and covered with a layer of cosmetic ceramic. The aim of this study was to compare the fracture toughness of three types of aesthetic ceramics, namely VITA VM®9, ceraMotion® Zr, and IPS e.max® Ceram. Materials and Methods: Three groups of aesthetic ceramics (n=10) were subjected to three-point bending tests...
May 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29971131/comparison-of-short-and-standard-implants-in-the-posterior-mandible-a-3d-analysis-using-finite-element-method
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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