Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 15 4 2018 08 19 197 204 EN Maryam Pourhajibagher Researcher, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran Nasim Chiniforush Researcher, Laser Research Center of Dentistry, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran Sima Shahabi Professor, Laser Research Center of Dentistry, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Department of Dental Biomaterials, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Morteza Palizvani Dentist, Private Practice, Tehran, Iran Abbas Bahador Associate Professor, Department of Microbiology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran 2017 10 24 2018 03 15 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. faecalis (ATCC 29212) was used. The experimental procedures included aPDT with curcumin (CUR) and indocyanine green (ICG) as photosensitizers, irrigation with 5.25% NaOCl, 0.2% and 2.0% CHX solutions as traditional endodontic irrigating solutions, and the control group. The antibacterial and anti-biofilm potentials were assessed by counting the colony forming units and also using the crystal violet assay, respectively. Results: According to the results, E. faecalis biofilm was disrupted by 65.3%, 81.0% and 92.6% using 0.2% CHX, 2.0% CHX, and 5.25% NaOCl, respectively (P<0.05). In addition, CUR- and ICG-mediated aPDT displayed a significant reduction in E. faecalis count (90.2% and 82.5%, respectively) and its biofilm (83.6% and 75.2%, respectively) in comparison to the control group (P<0.05). Conclusions: APDT has a high potential for elimination of E. faecalis and is almost equivalent to NaOCl and CHX. It can be used as an adjucnt to conventional endodontic irrigating solutions. https://fid.tums.ac.ir/index.php/fid/article/view/2200 https://fid.tums.ac.ir/index.php/fid/article/download/2200/1011

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 15 4 2018 08 19 259 265 EN Hakimeh Siadat Professor, Dental Research Center, Dentistry Research Institute, Department of Prosthodontics, Tehran University of Medical Sciences, School of Dentistry, Tehran, Iran Amir Reza Rokn Professor, Dental Implant Research Center, Dentistry Research Institute, Department of Periodontics, Tehran University of Medical Sciences, School of Dentistry, Tehran, Iran Elaheh Beyabanaki Assistant Professor, Department of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran 2018 01 31 2018 04 17 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 https://fid.tums.ac.ir/index.php/fid/article/view/2386 https://fid.tums.ac.ir/index.php/fid/article/download/2386/1016

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 15 4 2018 08 19 205 213 EN Baharan Ranjbar Omidi Assistant Professor, Department of Operative Dentistry, Dental Caries Prevention Research Center, Qazvin University of Medical Sciences, Qazvin, Iran Fatemeh Ferdowsizadeh Naeini Assistant Professor, Department of Pediatric Dentistry, Faculty of Dentistry, Kashan University of Medical Sciences, Kashan, Iran Hajar Dehghan Assistant Professor, Department of Pediatric Dentistry, Faculty of Dentistry, Qazvin University of Medical Sciences, Qazvin, Iran Parvin Tamiz Postgraduate Student, Department of Orthodontics, Faculty of Dentistry, Qazvin University of Medical Sciences, Qazvin, Iran Maryam Mohammadi Savadroodbari Assistant Professor, Department of Operative Dentistry, Faculty of Dentistry, Alborz University of Medical Sciences, Karaj, Iran Razieh Jabbarian Postgraduate Student, Department of Pediatric Dentistry, Faculty of Dentistry, Qazvin University of Medical Sciences, Qazvin, Iran 2017 12 18 2018 05 07 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. After debridement of each tooth, Class II (box only) cavities were prepared. Based on the type of the restorative material and the application of etching and bonding adhesives, the samples were categorized into five groups: (1) composite; (2) RMGI (Fuji II LC)+conditioner; (3) RMGI (Fuji II LC); (4) enhanced RMGI (ACTIVA Bioactive Restorative Glass)+etching/bonding; and (5) ACTIVA Bioactive Restorative Glass. The restored teeth were thermocycled for 2000 cycles. After embedding in an acrylic resin, the degree of dye penetration at axial and gingival walls was assessed using a stereomicroscope. The data were statistically analyzed by analysis of variance (ANOVA) and Tukey’s test. Results: Resin-based composite (RBC) Z250 showed the least microleakage, while RMGI showed maximum microleakage at axial walls. The mean degree of microleakage at gingival margins was the lowest in RBC Z250 and ACTIVA+etching/bonding groups and the highest in RMGI+conditioner and RMGI groups. Conclusions: The microleakage of ACTIVA Bioactive Restorative material in the absence or presence of etching and bonding could be comparable to the microleakage of composites https://fid.tums.ac.ir/index.php/fid/article/view/2294 https://fid.tums.ac.ir/index.php/fid/article/download/2294/1012

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 15 4 2018 08 19 214 221 EN Maryam Khoroushi Professor, Department of Restorative Dentistry, Dental Materials Research Center, Torabinejad Dental Research Center, Department of Operative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran Fatemeh Keshani Assistant Professor, Department of Restorative Dentistry, Dental Materials Research Center, Department of Restorative Dentistry, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. Moeen Hosseini Shirazi Assistant Professor, Department of Prosthodontics and Implantology, School of Dentistry, Babol University of Medical Sciences, Mazandaran, Iran Mehdi Esmaeili Dentist, Private Practice, Isfahan, Iran 2017 05 16 2018 05 02 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 1.5 mm. Next, the teeth were divided into 8 groups (n=12): G1-4 included normal dentin (N) substrate, while G5-8 were exposed to mineralization/demineralization cycles to produce CAD substrate. Groups 1 and 5 were the controls. ViscoStat was used in groups 2 and 6, ViscoStat Clear was used in groups 3 and 7, while trichloroacetic acid (TCA) was used in groups 4 and 8. The cavities were restored with composite resin. The samples were sectioned after thermocycling and immersion in 2% fuchsin for 24 hours. The degree of dye penetration was evaluated under a stereomicroscope at 40× magnification. Data were evaluated using Kruskal-Wallis and Mann-U-Whitney tests in SPSS 15 software (α=0.05). Results: Significant differences were recorded on the mean microleakage of different groups (P=0.047). There was a significant difference in the mean dentinal microleakage between N and CAD groups (P=0.014). The dentinal microleakage in group 3 was significantly higher than that in groups 4 to 8. Conclusions: According to the results, CAD showed less microleakage in comparison with intact dentin. ViscoStat Clear caused a greater microleakage than did ViscoStat or TCA. https://fid.tums.ac.ir/index.php/fid/article/view/1902 https://fid.tums.ac.ir/index.php/fid/article/download/1902/1013

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 15 4 2018 08 19 222 229 EN Hamid Jalali Assistant Professor, Department of Prosthodontics, Tehran University of Medical Sciences, Tehran, Iran Farzaneh Farid Assistant Professor, Department of Prosthodontics, Tehran University of Medical Sciences, Tehran, Iran Sudabeh Kulivand Postgraduate Student of Prosthodontics, Department of Prosthodontics, Tehran University of Medical Sciences, Tehran, Iran Saeed Nokar Associate Professor, Department of Prosthodontics, Tehran University of Medical Sciences, Tehran, Iran Kosar Dadgar Assistant Professor, Department of Prosthodontics, Mazandaran University of Medical Sciences, Mazandaran, Iran 2017 11 29 2018 06 16 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 37oC 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), 5.25% sodium hypochlorite (NaOCl)/15 seconds, 17% ethylenediaminetetraacetic acid (EDTA)/60 seconds, 2% chlorhexidine (CHX)/5 minutes, MTAD/5 minutes, and acid-etching/15 seconds. All canals were rinsed with normal saline and dried. Fiber posts were cemented using Panavia F2.0. After 24 hours, two mid-root slices of 1mm thickness were obtained from each specimen. Push-out bond strength test was performed in a universal testing machine at 0.5mm/minute. The maximum applied load was recorded, and the bond strength was calculated in megapascal (MPa). Data were analyzed by one-way analysis of variance (ANOVA) and Tukey's test.  Results: The mean shear bond strengths of etched (53.21±12.11 MPa), MTAD (52.47±14.75 MPa) and EDTA (49.08±10.19 MPa) groups were significantly higher than that of the control group (39.82±10.04 MPa). The difference was marginally significant for CHX group (49.8±13.57 MPa) and not significant for NaOCl group (47.15±17.64 MPa). Conclusions: Etching or irrigating the root canals with MTAD or EDTA after post space preparation increases the bond strength of Panavia F2.0 to dentin. https://fid.tums.ac.ir/index.php/fid/article/view/2257 https://fid.tums.ac.ir/index.php/fid/article/download/2257/1014

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 15 4 2018 08 19 230 239 EN Banafsheh Poormoradi Assistant Professor, Department of Periodontics, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran Parviz Torkzaban Associate Professor, Department of Periodontics, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran Leila Gholami Assistant Professor, Department of Periodontics, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran Amirarsalan Hooshyarfard Postgraduate Student, Department of Periodontics, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran Maryam Farhadian Assistant Professor, Department of Biostatistics, School of Public Health and Research Center for Health Sciences, Hamadan University of Medical Sciences, Hamadan, Iran 2018 05 26 2018 06 25 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=0.75 W, H mode, repetition rate=20 Hz). Recession depth (RD), recession width (RW), clinical attachment level (CAL), and probing depth (PD) were assessed at the baseline (one week before surgery) and at 2 and 6 months postoperatively. The amount of root coverage was quantified in the two groups. Data were analyzed using Friedman test and Wilcoxon signed-rank test. Results: No significant difference was noted between the case and control groups in any parameter (P>0.05). Significant improvement occurred in all the measured parameters in the two groups after surgery (P<0.05). The mean root coverage at the end of the study period was 87% and 80% in the case and control groups, respectively (P=0.244), and complete root coverage was achieved in 66% and 60% of the samples in the case and control groups, respectively. Conclusions: Root surface conditioning by Er,Cr:YSGG laser improved the mean root coverage and the percentage of complete root coverage. However, these changes were not statistically significant. https://fid.tums.ac.ir/index.php/fid/article/view/2578 https://fid.tums.ac.ir/index.php/fid/article/download/2578/1015

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 15 4 2018 08 https://fid.tums.ac.ir/index.php/fid/article/view/1009 https://fid.tums.ac.ir/index.php/fid/article/download/1009/928

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 13 6 2017 01 11 415 422 EN Hossein Najafi Prostodontist, Post Doc student, dental implant research center, dentistry research institute, Tehran University of medical science, Iran. Hakimeh Siadat Professor, Dental Implant Research Center, Dentistry Research Institute, Tehran University of Medical Sciences and Department of Prosthodontics, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran. Solmaz Akbari Assistant Professor, Dental Implant Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Department of Periodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Amir Reza Rokn Professor, Dental Implant Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Department of Periodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran 2015 12 14 2016 06 25 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. Results: One axial implant failed in the delayed group after one year of loading, resulting in cumulative implant survival rate of 99.3%. The mean marginal bone loss was 0.84mm. No significant difference was found between axial and tilted implants in the two groups (P>0.05) Conclusions: Based on the results, immediate or delayed fabrication of final prosthesis on two tilted and two axial implants did not result in significant differences in survival rates or marginal bone loss.   https://fid.tums.ac.ir/index.php/fid/article/view/955 https://fid.tums.ac.ir/index.php/fid/article/download/955/919

Tehran University of Medical Sciences Frontiers in Dentistry 2676-296X 13 6 2017 01 11 423 430 EN Javad Chalipa Assistant Professor, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Department of Orthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Yasamin Farajzadeh Jalali Assistant Professor, Department of Orthodontics, School of Dentistry, Ilam University of Medical Science, Ilam, Iran Fatemeh Gorjizadeh Assistant Professor, Department of Orthodontics, School of Dentistry, Yasuj University of Medical Science, Yasuj, Iran Pedram Baghaeian Private Practice Tehran University of Medical Sciences, Tehran, Iran Mohammad Hashem Hoseini Assistant Professor, Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran; Department of Orthodontics, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran Omid Mortezai Assistant Professor, Department of Orthodontics, Qazvin University of Medical Sciences, Qazvin, Iran 2015 12 27 2016 06 19 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. The samples were light cured according to the manufacturer’s instructions and thermocycled. The SBS was measured. The failure mode was scored using the adhesive remnant index (ARI). Results: The mean SBS of samples in groups A (high-power LED, metal bracket), B (high-power LED, ceramic bracket), C (conventional L