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Journal of Dentistry of Tehran University of Medical Sciences

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https://www.readbyqxmd.com/read/30405735/full-arch-all-on-4-fixed-implant-supported-prostheses-with-8-5-years-of-follow-up-a-case-report
#1
Hakimeh Siadat, Amirreza Rokn, Elaheh Beyabanaki
Typically, full arch reconstruction of edentulous ridges requires five to 10 dental implants; however, some patients demanding fixed implant-supported prostheses are not able to medically or economically afford complex bone grafts and/or a greater number of implants. These situations could pivot the treatment plan toward the All-on-4 protocol. Nevertheless, due to less implant support in this treatment option, mechanical and biological complications might arise. This article describes the treatment of a fully edentulous patient with two types of fixed implant-supported prostheses on four dental implants along with the following complications...
July 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30405734/effects-of-pretreatment-exposure-to-dental-practice-using-a-smartphone-dental-simulation-game-on-children-s-pain-and-anxiety-a-preliminary-double-blind-randomized-clinical-trial
#2
Razieh Meshki, Leila Basir, Fateme Alidadi, Azam Behbudi, Vahid Rakhshan
Objectives: Studies on modeling a pre-exposure technique for the prevention of anxiety in children are rare, and there is no study on interactive modeling using computer games. We assessed the effect of playing a dental simulation game before operation on pain and anxiety in 4- to 7-year-old children during their first dental treatment session. Materials and Methods: In this double-blind randomized clinical trial, 50 children needing unilateral pulpotomy and placement of stainless-steel crowns (SSC) on mandibular primary first molars were enrolled and randomly divided into experimental (a simulation game) and control (no intervention) groups...
July 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30405733/evaluation-of-enamel-and-dentinal-microleakage-in-class-ii-silorane-based-and-methacrylate-based-resin-composite-restorations-using-specific-and-nonspecific-adhesives
#3
Sayed Mostafa Mousavinasab, Maede Ghasemi, Mitra Yadollahi
Objectives: The aim of this study was to evaluate enamel and dentinal microleakage in Class II cavities restored with silorane- and methacrylate-based resin composites using specific and nonspecific adhesives. Materials and Methods: Thirty-six caries-free human premolars were used. Two Class II cavities were prepared on each tooth. The gingival floor was set at 1 mm above (on the mesial surface) and at 1 mm below (on the distal surface) the cementoenamel junction (CEJ)...
July 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30405732/effect-of-er-cr-ysgg-laser-root-conditioning-on-the-success-of-root-coverage-with-subepithelial-connective-tissue-graft-a-randomized-clinical-trial-with-a-6-month-follow-up
#4
Banafsheh Poormoradi, Parviz Torkzaban, Leila Gholami, Amirarsalan Hooshyarfard, Maryam Farhadian
Objectives: Finding predictable approaches for root surface biomodification is an important challenge in the treatment of gingival recession. This study sought to assess the root coverage percentage by subepithelial connective tissue graft (SCTG) following root surface conditioning with erbium, chromium: yttrium scandium gallium garnet (Er,Cr:YSGG) laser. Materials and Methods: In this split-mouth, randomized clinical trial, 30 teeth with Miller's Class I and II gingival recession were treated with SCTG (the Langer and Langer technique) with (case group) or without (control group) root surface conditioning with Er,Cr:YSGG laser (wavelength=2780 nm, power=0...
July 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30405731/effect-of-different-irrigants-applied-after-post-space-preparation-on-push-out-bond-strength-of-a-self-etch-resin-cement
#5
Hamid Jalali, Farzaneh Farid, Sudabeh Kulivand, Saeed Nokar, Kosar Dadgar
Objectives: The aim was to investigate the effect of intracanal irrigants and agents on the bond strength of intraradicular fiber posts to dentin. Materials and Methods: Root canals of 72 decoronated single-rooted premolars were cleaned, shaped, and obturated with gutta-percha and AH26. The specimens were incubated at 37°C and 100% humidity for seven days. Next, the coronal 10 mm of the canals were prepared to receive size 2 D.T. Light fiber post, and the specimens were randomly allocated into six groups according to the irrigants used after post space preparation: normal saline (control group), 5...
July 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30405730/marginal-integrity-of-cervical-restorations-with-caries-affected-dentinal-walls-effect-of-contamination-with-hemostatic-agents
#6
Maryam Khoroush, Fatemeh Keshani, Mehdi Esmaeili, Moeen Hosseini Shirazi
Objectives: The aim of this study was to compare the microleakage in normal and caries-affected dentin (CAD) and to investigate the effect of three hemostatic agents on the microleakage of Class V composite resin restorations in CAD. Materials and Methods: Ninety-six Class V non-beveled cavities were prepared in 48 third molars at 1 mm below the cementoenamel junction (CEJ) in the cervical margin with the occlusogingival size of 2 mm, mesiodistal dimension of 3 mm, and a depth of 1...
July 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30405729/microleakage-of-an-enhanced-resin-modified-glass-ionomer-restorative-material-in-primary-molars
#7
Baharan Ranjbar Omidi, Fatemeh Ferdowsizadeh Naeini, Hajar Dehghan, Parvin Tamiz, Maryam Mohammadi Savadroodbari, Razieh Jabbarian
Objectives: Resin composites, glass ionomers (GIs), or a combination of these materials have gradually replaced silver amalgam in pediatric dentistry. The purpose of this study was to compare the microleakage of Class II (box only) cavity restorations with ACTIVA Bioactive Restorative Glass, resin-modified GI (RMGI), and composite in primary molars. Materials and Methods: A total of 65 primary molars with at least one intact proximal surface were selected in this in-vitro study...
July 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30405728/antibacterial-and-antibiofilm-efficacy-of-antimicrobial-photodynamic-therapy-against-intracanal-enterococcus-faecalis-an-in-vitro-comparative-study-with-traditional-endodontic-irrigation-solutions
#8
Maryam Pourhajibagher, Nasim Chiniforush, Sima Shahabi, Morteza Palizvani, Abbas Bahador
Objectives: Enterococcus faecalis (E. faecalis) , an infecting microorganism of the root canals, is difficult to eliminate during endodontic therapy. In this study, the effect of root canal disinfection with sodium hypochlorite (NaOCl) and chlorhexidine (CHX) was evaluated on planktonic and biofilm forms of E. faecalis in comparison with antimicrobial photodynamic therapy (aPDT) as an alternative strategy for root canal disinfection. Materials and Methods: In this study, E...
July 2018: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/30090120/multidisciplinary-management-of-complicated-crown-root-fracture-a-case-report
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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