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Journal of Dentistry of Tehran University of Medical Sciences

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https://www.readbyqxmd.com/read/28127332/effect-of-addition-of-curcumin-nanoparticles-on-antimicrobial-property-and-shear-bond-strength-of-orthodontic-composite-to-bovine-enamel
#1
Ahmad Sodagar, Abbas Bahador, Maryam Pourhajibagher, Badreddin Ahmadi, Pedram Baghaeian
OBJECTIVES: This study sought to assess the effect of curcumin nanoparticles (curcNPs) on antimicrobial property and shear bond strength (SBS) of orthodontic composite to bovine enamel. MATERIALS AND METHODS: In this in vitro, experimental study, 1%, 5% and 10% curcNPs were added to Transbond XT composite. Stainless steel brackets were bonded to 48 sound bovine incisors in four groups (n=12) using composite containing 0% (control), 1%, 5% and 10% curcNPs. The bracket-tooth SBS was measured by a universal testing machine...
September 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127331/effect-of-modified-widman-flap-surgery-on-maximum-molar-bite-force-a-clinical-trial
#2
Jaber Yaghini, Vahid Sakhaei Manesh, Noushin Janbakhsh
OBJECTIVES: The purpose of the present study was to evaluate the effect of modified Widman flap (MWF) surgery (as a periodontal treatment procedure) on maximum bite force (MBF; as an indicator of patient function). MATERIALS AND METHODS: In this clinical trial, 24 patients were examined for their MBF before and at one, four and eight weeks after their MWF surgery. These recordings along with the patients' demographics were analyzed using repeated measures ANOVA at a significance level of 0...
September 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127330/diagnostic-efficacy-of-digital-waters-and-caldwell-s-radiographic-views-for-evaluation-of-sinonasal-area
#3
Hamed Ebrahimnejad, Seyed Hosein Hoseini Zarch, Adineh Javadian Langaroodi
OBJECTIVES: New digital two-dimensional imaging systems are considered as an easily accessible modality for sinonasal evaluation. The aim of this study was to assess the diagnostic efficacy of digital Waters' and Caldwell's radiographic views for evaluation of sinonasal area. MATERIALS AND METHODS: A total of 273 patients fulfilling the inclusion criteria were enrolled in this descriptive-analytical study. Complete opacification or mucosal thickening of frontal, ethmoidal and maxillary sinuses and nasal septum deviation were assessed on digital Waters and Caldwell images...
September 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127329/effect-of-etching-time-and-preparation-on-push-out-bond-strength-of-composite-to-intracanal-dentin-of-primary-anterior-teeth
#4
Shahram Mosharrafian, Hossein Afshar, Maryam Farbod, Zahra Baniameri
OBJECTIVES: This in-vitro study aimed to compare the push-out bond strength of composite to prepared and unprepared intracanal dentin using a 5th generation bonding agent in primary anterior teeth after etching for seven and 15 seconds. MATERIALS AND METHODS: Sixty primary anterior teeth were randomly divided into four groups. In groups one and two, intracanal dentin remained intact while in groups three and four it was prepared using a #5 round bur and low-speed handpiece...
September 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127328/effect-of-three-different-core-materials-on-masking-ability-of-a-zirconia-ceramic
#5
Farhad Tabatabaian, Faeze Masoomi, Mahshid Namdari, Minoo Mahshid
OBJECTIVES: Masking ability of a restorative material plays a role in hiding colored substructures; however, the masking ability of zirconia ceramic (ZRC) has not yet been clearly understood in zirconia-based restorations. This study evaluated the effect of three different core materials on masking ability of a ZRC. MATERIALS AND METHODS: Ten zirconia disc samples, 0.5mm in thickness and 10mm in diameter, were fabricated. A white (W) substrate (control) and three substrates of nickel-chromium alloy (NCA), non-precious gold alloy (NPGA), and ZRC were prepared...
September 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127327/accuracy-of-linear-measurements-using-cone-beam-computed-tomography-in-comparison-with-clinical-measurements
#6
Amir Reza Rokn, Kazem Hashemi, Solmaz Akbari, Mohammad Javad Kharazifard, Hamidreza Barikani, Mehrdad Panjnoosh
OBJECTIVES: This study sought to evaluate the accuracy and errors of linear measurements of mesiodistal dimensions of Kennedy Class III edentulous space using cone beam computed tomography (CBCT) in comparison with clinical measurements. MATERIALS AND METHODS: Nineteen Kennedy Class III dental arches were evaluated. An impression was made of each dental arch and poured with dental stone. The distance was measured on dental cast using a digital Vernier caliper with an accuracy of 0...
September 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127326/assessment-of-surface-markers-derived-from-human-periodontal-ligament-stem-cells-an-in-vitro-study
#7
Zainab Kadkhoda, Sahar Chokami Rafiei, Bahare Azizi, Ahad Khoshzaban
OBJECTIVES: Periodontal tissue regeneration for treatment of periodontal disease has not yet been mastered in tissue engineering. Stem cells, scaffold, and growth factors are the three main basic components of tissue engineering. Periodontal ligament (PDL) contains stem cells; however, the number, potency and features of these cells have not yet been understood. This study aimed to isolate and characterize the properties of PDL stem cells. MATERIALS AND METHODS: In this experimental study, samples were isolated from the PDL of extracted teeth of five patients and then stained immunohistochemically for detection of cell surface markers...
September 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127325/effect-of-re-etching-of-oxalate-occluded-dentin-on-microleakage-of-composite-resin-restorations
#8
Aida Saffarpour, Maryam Ghavam, Anna Saffarpour, Kimiya Sadighi, Mohammad Javad Kharazifard
OBJECTIVES: This study aimed to assess the effect of re-etching of desensitized dentin for five and 10 seconds on marginal microleakage of composite restorations. MATERIALS AND METHODS: Class V cavities (4×2×2mm) were prepared on the buccal surfaces of 64 third molars and randomly divided into four groups of 16. In the control group, Single Bond (SB) adhesive was applied after etching. In BB+SB group, after application of BisBlock (BB) desensitizer agent (which needs etching), SB adhesive was used...
September 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127324/effect-of-postoperative-amoxicillin-on-early-bacterial-colonization-of-peri-implant-sulcus-a-randomized-controlled-clinical-trial
#9
Neda Moslemi, Aysan Shahnaz, Abbas Bahador, Sepehr Torabi, Sanaa Jabbari, Zahra Alizadeh Oskouei
OBJECTIVES: With side effects of antibiotics taken into consideration, the necessity of antibiotic therapy after simple implant placement procedures is still a subject of debate and the existing literature on this topic is widely controversial. The aim of this study was to assess the effect of postoperative amoxicillin therapy on early colonization of peri-implant sulcus after implant placement. MATERIALS AND METHODS: In this randomized controlled clinical trial, 20 patients requiring simple implant placement were randomly allocated to test or control groups and received postoperative amoxicillin or placebo, respectively...
September 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127323/correlation-between-bone-and-soft-tissue-thickness-in-maxillary-anterior-teeth
#10
Nasrin Esfahanizadeh, Niloufar Daneshparvar, Farinaz Askarpour, Nasrin Akhoundi, Mehrdad Panjnoush
OBJECTIVES: The purpose of this study was to determine buccal bone and soft tissue thicknesses and their correlation in the maxillary anterior region using cone beam computed tomography (CBCT). MATERIALS AND METHODS: In this cross sectional study, 330 sound maxillary incisors in 60 patients with a mean age of 37.5 years were assessed by CBCT scans. For better visualization of soft tissue, patients were asked to use plastic retractors in order to retract their lips and cheeks away from the gingival tissue before taking the scans...
September 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127322/a-multidisciplinary-approach-to-a-seven-year-old-patient-with-incontinentia-pigmenti-a-case-report-and-five-year-follow-up
#11
Rezvan Rafatjou, Fariborz Vafaee, Hanif Allahbakhshi, Porousha Mahjoub
Incontinentia pigmenti is a rare inherited disorder involving abnormalities of the skin, hair, eyes, musculoskeletal system, central nervous system, and the teeth. Dental abnormalities are the most common manifestations of this disorder. The purpose of this case report was to present the clinical and radiological findings of a seven-year-old girl as well as the results of her five-year follow up. The patient showed faded linear pigmented macular lesions on the trunk and on upper and lower limbs. Dental examination was notable for conical and peg-shaped anterior teeth as well as delayed eruption of primary and permanent teeth...
August 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127321/evaluation-of-morphology-and-anatomical-measurement-of-nasopalatine-canal-using-cone-beam-computed-tomography
#12
Mehrdad Panjnoush, Hamideh Norouzi, Yasaman Kheirandish, Ahmad Reza Shamshiri, Niloufar Mofidi
OBJECTIVES: Precise radiographic assessment of the nasopalatine canal is required to prevent implant failure. The purpose of the current study was to determine the three dimensional (3D) morphology, as well as the dimensions of the nasopalatine canal using cone beam computed tomography (CBCT). MATERIALS AND METHODS: In this descriptive cross-sectional study, maxillary CBCT images from 300 patients (150 men, 150 women) were retrospectively evaluated. Sagittal and coronal views were reviewed to determine the nasopalatine canal morphology and dimensions...
August 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127320/effect-of-voxel-size-and-object-location-in-the-field-of-view-on-detection-of-bone-defects-in-cone-beam-computed-tomography
#13
Hoorieh Bashizadeh Fakhar, Mysa Mallahi, Mehrdad Panjnoush, Pooneh Mohseni Kashani
OBJECTIVES: This study aimed to assess the effect of voxel size and object location in the field of view (FOV) on diagnostic accuracy of cone beam computed tomography (CBCT) for detection of simulated bone defects. MATERIALS AND METHODS: In this in vitro study, bone defects were drilled in four sections of a dry human mandible. Bone blocks were fixed on a platform parallel to the horizontal plane and CBCT images were acquired using 0.2mm and 0.3mm resolutions and five locations of FOV (anterior, posterior, left, right and center)...
August 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127319/comparison-of-periodontal-ligament-stem-cells-isolated-from-the-periodontium-of-healthy-teeth-and-periodontitis-affected-teeth
#14
Sara Soheilifar, Iraj Amiri, Mohsen Bidgoli, Morad Hedayatipanah
OBJECTIVES: Stem cell (SC) therapy is a promising technique for tissue regeneration. This study aimed to compare the viability and proliferation ability of periodontal ligament stem cells (PDLSCs) isolated from the periodontium of healthy and periodontitis-affected teeth to obtain an autologous, easily accessible source of SCs for tissue regeneration in periodontitis patients. MATERIALS AND METHODS: The PDLSCs were isolated from the roots of clinically healthy premolars extracted for orthodontic purposes and periodontally involved teeth with hopeless prognosis (with and without phase I periodontal treatment)...
August 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127318/effect-of-energy-drinks-on-discoloration-of-silorane-and-dimethacrylate-based-composite-resins
#15
Ghazaleh Ahmadizenouz, Behnaz Esmaeili, Zohreh Ahangari, Soraya Khafri, Aghil Rahmani
OBJECTIVES: This study aimed to assess the effects of two energy drinks on color change (ΔE) of two methacrylate-based and a silorane-based composite resin after one week and one month. MATERIALS AND METHODS: Thirty cubic samples were fabricated from Filtek P90, Filtek Z250 and Filtek Z350XT composite resins. All the specimens were stored in distilled water at 37°C for 24 hours. Baseline color values (L*a*b*) of each specimen were measured using a spectrophotometer according to the CIEL*a*b* color system...
August 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127317/a-comparison-of-radiographic-film-densitometry-using-a-new-computerized-tool-with-a-digital-densitometer
#16
Hoorieh Bashizadeh Fakhar, Elham Sadat Emadian Razavi, Sepideh Soheilifar, Mohammad Javad Kharazifard
OBJECTIVES: The purpose of this study was to develop and test a new tool for radiographic densitometry by combining periapical films and aluminum step wedge. MATERIALS AND METHODS: We reviewed 50 Kodak E-speed intraoral films. An aluminum step wedge consisting of 16 steps was constructed. Each step was 1mm×3m×10mm. The step wedge was exposed to varying exposure times, ranging from 0.05 second to 0.5 second, increasing in 0.05 second increments. Films were digitalized after processing and the MATLAB software algorithm was ran subsequently...
August 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127316/in-vitro-evaluation-of-the-effect-of-herbal-antioxidants-on-shear-bond-strength-of-composite-resin-to-bleached-enamel
#17
Zahra Khamverdi, Parvin Khadem, Aliraza Soltanian, Maryam Azizi
OBJECTIVES: A reduction in bond strength of composite to bleached enamel has been reported immediately after bleaching treatment. Application of some antioxidant agents may decrease the adverse effects of whitening agents on bond strength and enhance composite bond to enamel. This study aimed to assess the effect of green tea, sodium ascorbate, sage and grape seed extract on bond strength of composite to bleached enamel. MATERIALS AND METHODS: In this in-vitro study, 90 human enamel surfaces were randomly divided into six groups as follows (n=15): G1, no bleaching; G2, bleaching with 40% hydrogen peroxide (HP); G3, HP+1000 μmol epigallocatechin gallate (EGCG) for 10 minutes; G4, HP+10% sodium ascorbate for 10 minutes; G5, HP+10% sage for 10 minutes and G6, HP+5% grape seed extract for 10 minutes...
August 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127315/relationship-between-different-types-and-forms-of-anti-asthmatic-medications-and-dental-caries-in-three-to-12-year-olds
#18
Alireza Heidari, Bahman Seraj, Mahdi Shahrabi, Hamideh Maghsoodi, Mohammad Javad Kharazifard, Tara Zarabian
OBJECTIVES: Asthma is a common chronic disease. Asthma and anti-asthmatic medications have been suggested as risk factors for increased susceptibility to caries. This study was conducted to evaluate the effects of different types and forms of antihistaminic medications and the duration of drug consumption on the severity of dental caries in asthmatic children. MATERIALS AND METHODS: This cross-sectional study was conducted in Asthma and Allergy Department of Children's Medical Center in Tehran, Iran...
August 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127314/effect-of-chlorhexidine-application-protocol-on-durability-of-marginal-seal-of-class-v-restorations
#19
Anna Saffarpour, Aida Saffarpour, Mohammad Javad Kharazifard, Atoussa Entezami Rad
OBJECTIVES: This study aimed to evaluate the effect of chlorhexidine (CHX) application protocol on durability of marginal seal of class V composite restorations. MATERIALS AND METHODS: Class V cavities (4×2×1.5mm) were prepared in the buccal surfaces of 160 human third molars. The teeth were randomly divided into five groups (n=32) of (G1) CHX+rinse+etching, (G2) CHX+etching, (G3) etching+CHX+rinse, (G4) etching+ CHX, and (G5) etching alone as the control group...
August 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28127313/effect-of-lactic-acid-on-microleakage-of-class-v-low-shrinkage-composite-restorations
#20
Sedigheh Sadat Hashemikamangar, Seyed Jalal Pourhashemi, Zohre Nekooimehr, Mehrzad Gholampur Dehaki, Mohamad Javad Kharazifard
OBJECTIVES: To assess the effect of lactic acid (LA) on microleakage of silorane-based composite restorations and methacrylate-based composites with self-etch and etch-and-rinse bonding systems. MATERIALS AND METHODS: Class V cavities were prepared in 120 extracted human teeth, divided into four groups and restored as follows: 1. Silorane-based composite+P90 adhesive system (P90); 2. Filtek Z250+SE Bond (Z250SE); 3. Filtek Z350+SE Bond (Z350SE) and 4. Filtek Z250+Single Bond (Z250SB)...
August 2016: Journal of Dentistry of Tehran University of Medical Sciences
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