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Journal of Dentistry of Tehran University of Medical Sciences

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https://www.readbyqxmd.com/read/28243307/a-case-report-of-dilacerated-crown-of-a-permanent-mandibular-central-incisor
#1
Behnam Bolhari, Salma Pirmoazen, Ensieh Taftian, Somayeh Dehghan
Trauma to primary teeth can lead to devastating sequels in development of permanent successors. The disturbance may range from enamel hypoplasia and/or hypo-calcification to arrest of dental bud development. Crown dilaceration of permanent teeth is one of the consequences of trauma to deciduous teeth mainly due to intrusion or avulsion. This report presents a mandibular central incisor with dilacerated crown and yellowish discoloration with symptomatic apical abscess. History revealed avulsion of primary mandibular central incisors...
November 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28243306/canal-configuration-of-mesiobuccal-roots-in-permanent-maxillary-first-molars-in-iranian-population-a-systematic-review
#2
Mandana Naseri, Mohammad Javad Kharazifard, Sepanta Hosseinpour
OBJECTIVES: It is essential for clinicians to have adequate knowledge about root canal configurations; although its morphology varies largely in different ethnicities and even in different individuals with the same ethnic background. The current study aims to review the root canal configurations of mesiobuccal roots of maxillary first molars in an Iranian population based on different epidemiological studies. MATERIALS AND METHODS: A comprehensive search was conducted to retrieve articles related to root canal configuration and prevalence of each type of root canal based on Vertucci's classification for the mesiobuccal root of maxillary first molars...
November 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28243305/effect-of-different-surface-treatments-on-microtensile-bond-strength-of-composite-resin-to-normal-and-fluorotic-enamel-after-microabrasion
#3
Mahshid Mohammadi Bassir, Mohammad Bagher Rezvani, Elham Tabatabai Ghomsheh, Zahra Malek Hosseini
OBJECTIVES: This study aimed to determine the effect of surface treatments such as tooth reduction and extending the etching time on microtensile bond strength (μTBS) of composite resin to normal and fluorotic enamel after microabrasion. MATERIALS AND METHODS: Fifty non-carious anterior teeth were classified into two groups of normal and fluorotic (n=25) using Thylstrup and Fejerskov index (TFI=4-6). Teeth in each group were treated with five modalities as follows and restored with OptiBond FL and Z350 composite resin: 1-Etching (30 seconds), bonding, filling (B); 2-Tooth reduction (0...
November 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28243304/comparison-of-bond-strength-of-metal-and-ceramic-brackets-bonded-with-conventional-and-high-power-led-light-curing-units
#4
Javad Chalipa, Yasamin Farajzadeh Jalali, Fatemeh Gorjizadeh, Pedram Baghaeian, Mohammad Hashem Hoseini, Omid Mortezai
OBJECTIVES: The aim of this study was to evaluate the effect of conventional and high-power light emitting diode (LED) light curing units on shear bond strength (SBS) of metal and ceramic brackets to tooth surface. MATERIALS AND METHODS: Forty sound bovine maxillary central incisors were used for the study. The teeth were divided into four groups (n=10). Teeth surfaces were etched with 37% phosphoric acid for 20 seconds. After applying a uniform layer of adhesive primer on the etched enamel, composite was placed on the base of brackets...
November 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28243303/effects-of-immediate-and-delayed-loading-on-the-outcomes-of-all-on-4-treatment-a-prospective-study
#5
Hossein Najafi, Hakimeh Siadat, Solmaz Akbari, Amirreza Rokn
OBJECTIVES: The purpose of this study was to compare the outcomes of immediate and delayed rehabilitation of edentulous jaws by means of two straight and two tilted implants after one year of function. MATERIALS AND METHODS: Thirty consecutive patients (16 males, 14 females) were enrolled in this study. Two anterior straight and two posterior tilted implants were placed in each patient. According to the implant insertion torque and the need for bone grafting, implants were loaded immediately (at 72 hours) or delayed (after four months) using a fixed metal resin prosthesis...
November 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28243302/effect-of-mechanical-loads-and-surface-roughness-on-wear-of-silorane-and-methacrylate-based-posterior-composites
#6
Masomeh Hasani Tabatabaei, Sakineh Arami, Farnaz Farahat
OBJECTIVES: Dental composite wear in posterior restorations is a concern and is affected by different factors. This study was conducted to evaluate the effect of polishing and mechanical loads on wear of silorane-based and methyl methacrylate-based composites resins. MATERIALS AND METHODS: Of each dental composite (Filtek P90 and Filtek P60), 40 samples were fabricated in a polyethylene mold (4mm diameter, 10mm height). According to the finishing and/or polishing protocols (180-grit or 2500-grit silicon carbide papers), the samples of each composite were divided into two groups...
November 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28243301/fracture-strength-of-three-unit-implant-supported-fixed-partial-dentures-with-excessive-crown-height-fabricated-from-different-materials
#7
Vahideh Nazari, Safoura Ghodsi, Marzieh Alikhasi, Majid Sahebi, Ahmad Reza Shamshiri
OBJECTIVES: Fracture strength is an important factor influencing the clinical long-term success of implant-supported prostheses especially in high stress situations like excessive crown height space (CHS). The purpose of this study was to compare the fracture strength of implant-supported fixed partial dentures (FPDs) with excessive crown height, fabricated from three different materials. MATERIALS AND METHODS: Two implants with corresponding abutments were mounted in a metal model that simulated mandibular second premolar and second molar...
November 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28243300/comparison-of-apical-extrusion-of-debris-by-using-single-file-full-sequence-rotary-and-reciprocating-systems
#8
Maryam Ehsani, Robab Farhang, Azadeh Harandi, Saeid Tavanafar, Maryam Raoof, Saeedeh Galledar
OBJECTIVES: During root canal preparation, apical extrusion of debris can cause inflammation, flare-ups, and delayed healing. Therefore, instrumentation techniques that cause the least extrusion of debris are desirable. This study aimed to compare apical extrusion of debris by five single-file, full-sequence rotary and reciprocating systems. MATERIALS AND METHODS: One hundred twenty human mandibular premolars with similar root lengths, apical diameters, and canal curvatures were selected and randomly assigned to six groups (n=20): Reciproc R25 (25, 0...
November 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28243299/assessment-of-the-role-of-no-cgmp-pathway-in-orthodontic-tooth-movement-using-pde5-inhibitors-an-animal-study
#9
Amir Hossein Mirhashemi, Mohammad Sadegh Ahmad Akhoundi, Rezvaneh Ghazanfari, Shahroo Etemad-Moghadam, Mojgan Alaeddini, Azam Khorshidian, Ahmad Reza Dehpour, Nafiseh Momeni
OBJECTIVES: Nitric oxide (NO) is a signaling molecule that mediates mechanical bone loading. Cyclic guanosine 3', 5' monophosphate (cGMP) is a NO-induced effector molecule. The aim of this study was to assess the effect of NO-cGMP pathway on orthodontic tooth movement (OTM) in rats by use of two phosphodiesterase 5 (PDE5) inhibitors namely sildenafil and tadalafil as chemical tools. MATERIALS AND METHODS: Forty-five male Wistar rats were divided into three equal groups (n=15) based on the substance they received...
November 2016: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/28243298/prediction-of-mesiodistal-width-of-unerupted-lateral-incisors-canines-and-premolars-in-orthodontic-patients-in-early-mixed-dentition-period
#10
Mohammad Hossein Toodehzaeim, Alireza Haerian, Ali Alesaeidi
OBJECTIVES: Proper diagnosis and prevention of malocclusion are superior to treatment. Discrepancy between arch length and tooth size in mixed dentition period is a condition requiring timely diagnosis. Estimating the mesiodistal width of unerupted teeth according to the size of erupted ones can lead to earlier diagnosis of malocclusion. On the other hand, the best timing for serial extractions is before the eruption of lateral incisors. The aim of this study was to present prediction formulas for mesiodistal width of unerupted lateral incisors, canines and premolars in an Iranian population based on the width of erupted permanent mandibular central incisors and maxillary first molars...
November 2016: Journal of Dentistry of Tehran University of Medical Sciences
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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