Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
9
1
2020
03
01
Effects of root canal irrigants and medicaments on dentin and vice versa: a review of Literature
1
9
EN
Zahed
Mohammadi
Iranian Center for Endodontic Research (ICER), Research Institute of Dental Sciences, Shahid Beheshti University of Medical Sciences, Tehran, Iran and Iranian National Elites Foundation, Tehran, Iran
Jun-Ichiro
Kinoshita
Department of Conservative Dentistry, Showa University Dental Hospital, Tokyo, Japan
Atsufumi
Manabe
Department of Conservative Dentistry, Showa University Dental Hospital, Tokyo, Japan
Mikihiro
Kobayashi
Department of Conservative Dentistry, Showa University Dental Hospital, Tokyo, Japan
Sousan
Shalavi
Private Dental Practice, Hamedan, Iran
Flavio
Palazzi
Department of Neuroscience, Reproductive and Odontostomatological Sciences, Federico II University of Naples, Naples, Italy
flaviopalazzi388888@yahoo.com
Shapour
Yaripour
Department of Oral and Maxillofacial Surgery, Hamedan University of Medical Sciences, Hamedan, Iran
Hamid
Jafarzadeh
0000-0001-5318-7129
Mashhad Faculty of Dentistry
hamid_j365@yahoo.com
10.22038/jdmt.2020.42736.1309
Microorganisms are very important in the initiation of pulpo-periapical pathosis. Due to the complexity of the root canal system, the mechanical instrumentation of the root canal system should be supplemented with proper canal irrigants and medicaments. It has been revealed that due to the interactions of canal irrigants and medicaments with dentin and contents of the canal system, the antimicrobial effect of canal irrigants and medicaments in canal (<em>ex vivo</em>) are different from that <em>in vitro</em>. Furthermore, root canal irrigants may decrease the fracture resistance of dentin. The purpose of this paper was to review the data on the interactions between root canal irrigants/medicaments and dentin/root canal contents.
Calcium hydroxide,Chlorhexidine,Dentin,EDTA,iodine compounds,MTA,MTAD,NaOCl
https://jdmt.mums.ac.ir/article_14597.html
https://jdmt.mums.ac.ir/article_14597_d4d4506dafde79e388f863c9f8fe37a8.pdf
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
9
1
2020
03
01
Artifacts of Titanium, Zirconium, and Binary Titanium-Zirconium Abutments in Compute Tomography, Cone Beam Computed Tomography, and Magnetic Resonance Imaging
10
14
EN
Hoorieh
Bashizadeh Fakhar
Department of Dentomaxillofacial Radiology, School of Dentistry, Tehran University of Medical Sciences
h_bashizadeh@yahoo.com
Hashem
Sharifian
Tehran university of medical sciences
hashem_sh@yahoo.com
Mahdi
Niknami
0000-0001-8097-1138
Department of Maxillofacial Radiolgy, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
niknami81@yahoo.com
Mahboobeh
Iranmanesh
Rafsanjan dental school
mahboobeir@gmail.com
10.22038/jdmt.2020.44020.1317
Aim: The aim of this in vitro study was to evaluate imaging artifacts induced by Titanium, Zirconium, Titanium-Zirconium abutments in CT, MRI and CBCT imaging modalities.<br /><br />Methods: A 4×8mm titanium fixture was inserted in a dry human mandible. Titanium, Zirconium and Titanium–Zirconium abutments measuring 10.5 mm in height are located on the fixture, one by one. Each abutment was scanned 4 times by each imaging modality. Gray value of the images was evaluated in four determined regions adjacent to distal, mesial, buccal and lingual aspects of the implant as the region of interest (ROI) by two observers using image J software. Gray value differences (∆GV) between the control (fixture without abutment) and case images (fixture and each type of abutments) were calculated. Data evaluation was done by analysis of variance and Post Hoc tests.<br /><br />Results: In CBCT, ∆GV was significantly higher in zirconium-titanium images comparing with titanium abutments. (P Value < 0.05)<br />In distal, mesial and buccal aspects of ROI in CT, ∆GV was higher in zirconium images comparing with titanium abutments.<br />In MRI, ∆GV for zirconium were lower than titanium-zirconium and titanium samples, respectively. Also, no significant differences in ∆GV were seen between T1 and T2 protocols, for all samples. <br /><br />Conclusion: In MRI, image artifacts are the least around Zirconium abutments, while in CT and CBCT, titanium abutments produced the least amount of artifacts.
Artifact,Implant,Titanium,Titanium-zirconium,Zirconium,CT,CBCT,MRI
https://jdmt.mums.ac.ir/article_14635.html
https://jdmt.mums.ac.ir/article_14635_0f20711cf039f7214b395e623700891b.pdf
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
9
1
2020
03
01
Effect of Zinc Oxide-Eugenol Temporary Restorations on Bond Strength of Composite Resin
15
20
EN
Parnian
Zareie
UWA Dental School, The University of Western Australia, Perth, Australia
parnianzareie@gmail.com
Jocelyn
Ho
UWA Dental School, The University of Western Australia, Perth, Australia
jlynho@gmail.com
Ching Wen
Tan
UWA Dental School, The University of Western Australia, Perth, Australia
chingwen.9@gmail.com
Paul
Abbott
0000-0001-5727-4211
UWA Dental School, The University of Western Australia, Perth, Australia
paul.v.abbott@uwa.edu.au
10.22038/jdmt.2020.44085.1318
<strong>Introduction</strong>: Effect of zinc oxide-eugenol (ZO-E) on bond strength of composite is equivocal. The aim of the present study was to determine if ZO-E affects shear bond strength. <strong>Methods</strong>: For the purposes of the study, extracted human molar teeth were ground so thatcomposite rods could be bonded to dentine. In group 1, dentine was not exposed to ZO-E. In group 2, ZO-E was applied to dentine for 10 days prior to acid etching and bonding the composite. A universal testing machine was used to determine the composite’s shear bond strength. Data were analyzed using t-test<strong>. Results</strong>: Mean score of shear bond strengths were 137.15 (± 46.82) and 140.08 (± 40.39) N for groups 1 and 2, respectively, with no statistically significant difference. Majority of samples in Group 1 (74% vs. 65%) had “clean breaks” where the composite fractured without any dentine attached, while the rest of the samples had some dentine attached.<br /> <strong>Conclusions</strong>: ZO-E can be used for temporary fillings without affecting bond strength of subsequent composite restorations<strong>.</strong>
Composite Resin,Shear bond strength,zinc oxide-eugenol
https://jdmt.mums.ac.ir/article_14615.html
https://jdmt.mums.ac.ir/article_14615_dda0eac2c08f6caa9b914252cd04b68d.pdf
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
9
1
2020
03
01
Mothers’ Knowledge and Practice towards the Effects of Iron Supplementation on Tooth Staining and Dental Caries in Yazd, Iran
21
26
EN
iman
parisay
0000000173919542
Department of Pediatric dentistry, Faculty of Dentistry, Mashhad University of Medical Sciences, Iran
parisayi@mums.ac.ir
Sara
Arastoo
private practice pedodontist
arastoos@gmial.com
Aliasghar
Soleymani
Department of pediatric dentistry,Faculty of dentistry,Shahid Beheshti University of medical Sciences
drsoleymaniali@yahoo.com
Alaleh
Toloee
Post graduate Student of Paediatric Dentistry, Faculty of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
alaletoloei@gmail.com
Mahsa
Ahmadi Shadmehri
0000-0002-9009-1107
5 Post graduate Student of Periodontics, Faculty of Dentistry, Islamic Azad University of Isfahan(Khorasgan), Isfahan, Iran
mhs.ahmadishadmehri@gmail.com
10.22038/jdmt.2020.44088.1319
<strong>Aims:</strong> Iron supplementation in children under 5 years of age is recommended on the basis of anaemia prevention. This study aims to assess the mother’s knowledge and practice towards the effects of iron supplementation on dental caries and staining in children aged 6 months to 2 years in Yazd, Iran. <strong>Methods:</strong> A randomized cross-sectional study was conducted on 403 mothers of children (aged 6 months to 2 years) who referred to healthcare centers in Yazd during 2011. The mothers' knowledge and practice levels were assessed using a questionnaire, and the results were categorized into sufficient or insufficient. The Chi-square test was used to analyze the data. <strong>Results:</strong> According to the results, 241 (59.8%), and 273 (67.7%) mothers obtained sufficient levels of knowledge, and practice, respectively. Moreover, mothers’ educational levels had a statistically significant relationship with their knowledge regarding iron supplementation (P<0.001). Additionally, the mother’s practice toward iron supplementation correlated significantly with mothers’ educational level (P<0.001) and occupational status (P=0.018), as well as the birth order of the child (P<0.001). <strong>Conclusion:</strong> More than half of the mothers had sufficient knowledge and practice towards the effects of iron supplementation on dental caries and staining
Dental Caries,Dental staining,Iron deficiency,Knowledge,Practice
https://jdmt.mums.ac.ir/article_14631.html
https://jdmt.mums.ac.ir/article_14631_cd3a486aa41204f53fe632dd10ebe8a7.pdf
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
9
1
2020
03
01
In vitro Cytotoxicity of Silver Nanoparticles Incorporated in a Soft Silicone Liner
27
35
EN
Sareh
Habibzadeh
0000-0002-5098-3880
Assistant Professor, Department of Prosthodontics, School of Dentistry, International Campus Tehran University of Medical Sciences, Tehran, Iran.
sareh.habibzadeh@gmail.com
Seyyed Mostafa
Fatemi
Department of Dental Material, School of Dentistry, Shahid Beheshti University of Medical Sciences, Medical Laser Research Center, Academic Center for Education, Culture & Research (ACECR), Tehran, Iran.
fatemi@sbmu.ac.ir
10.22038/jdmt.2020.44359.1321
<strong>Introduction:</strong> Silver nanoparticles (SNPs) have recently been suggested to increase the antimicrobial properties of soft liner materials. However, their safety remains a matter of debate. This study aimed to evaluate the cytotoxicity of Mucopren<sup>®</sup> soft silicone liner material (Mucopren; Kettenbach, Germany) incorporated in SNPs. <strong>Methods:</strong> The SNPs with over 98% purity were added to Mucopren in 0.5, 1, 2, and 3 weight percentage (wt%) concentrations and manually homogenized. The mixture of the pieces of Mucopren plus SNPs and SNPs alone were placed in 96-well plates containing Dulbecco's Modified Eagle Medium culture, FBS, and antibiotics with L929 fibroblasts. Cell viability and biocompatibility were determined after 1, 2, and 3 days of incubation using the methylthiazol tetrazolium assay. Optical density was read by an ELISA reader at 570 nm and compared to those of positive and negative controls. <strong>Results:</strong> Among Mucopren mixed with different SNPs concentration, the cell toxicity had no significant difference in the same days, and cell toxicity decreased over time (P=0.016). The SNPs alone were less cytotoxic than Mucopren incorporated SNP samples (P>0.05). <strong>Conclusion:</strong> Within the limitations of this study, the addition of 0.5, 1, 2, and 3wt% concentrations of SNPs to Mucopren did not cause a significant change in its cell toxicity in an in vitro condition
Cytotoxicity,Nanoparticle,Silver,Soft Liner
https://jdmt.mums.ac.ir/article_14612.html
https://jdmt.mums.ac.ir/article_14612_2276f7ab34f7f2967e570cb7eaeab37d.pdf
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
9
1
2020
03
01
Dimensional accuracy of three impression materials by one-step and two-step impression techniques: An in vitro study
36
42
EN
Zahra
Afshari
0000-0001-5008-5696
Department of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
afsharyzhra1@gmail.com
Rahab
Ghoveizi
Department of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
rahab80@yahoo.com
Layla
Moein
Department of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
moeinlayla@gmail.com
Mahdi
Shamali
0000-0001-7628-0887
Department of Clinical Research, University of Southern Denmark, Odense, Denmark
mshamali@health.sdu.dk
Sara
Tavakolizadeh
0000-0002-8685-5565
Department of Prosthodontics, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
saratavakolizadeh@yahoo.com
10.22038/jdmt.2020.43747.1314
<strong>Introduction:</strong> An accurate impression is essential to create a well-fitted dental prosthesis. This study aimed to compare the dimensional accuracy of three elastomeric materials using one-step and two-step impression techniques. <strong>Methods:</strong> In this study, 20 impressions were fabricated for each Vinyl siloxane ether (Identium), condensation silicone (Speedex), and additional silicone (Panasil) impression materials by the one-step and two-step impression techniques using perforated metal trays. The one-step impression technique was simultaneously performed with heavy body/light-body materials. In the two-step impression technique, acrylic copings with 2-mm thickness were placed on the abutments to obtain similar spacing for the light-body material. The dimensional accuracy of different impression materials and techniques were measured using distance differences of the stone dies from the master cast; subsequently, the results were compared with the reference model. Data were analyzed using a one-way analysis of variance and Dunnett’s tests (α=0.05). <strong>Results:</strong> All impression materials demonstrated an acceptable clinical accuracy. Identium (Vinyl siloxane ether) displayed the most accuracy in both the one-step and two-step impression techniques (P>0.05). The best accuracy for Panasil (additional silicone) was found to be the two-step impression technique (P>0.05), and the best accuracy for Speedex (condensation silicone) was reported as the one-step impression technique (P>0.05). Furthermore, the one-step impression technique was highly accurate in diameter dimension, as compared to the two-step impression technique. <strong>Conclusion:</strong> As evidenced by the results, the accuracy of impression is affected by the impression materials. Moreover, Identium (Vinyl siloxane ether) demonstrated the most accuracy in both one-step and two-step impression techniques.
Dental Impression Materials,Dental Impression Technique,Silicone,Dimensional Accuracy
https://jdmt.mums.ac.ir/article_14712.html
https://jdmt.mums.ac.ir/article_14712_d020a2b2626bd1fde2078638ec919770.pdf
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
9
1
2020
03
01
Effects of N-Vinylcaprolactam Containing Polyacids and Zirconia on Mechanical Properties of Commercial Glass Ionomer Cements
43
50
EN
shabnam
aslani
shabnam.aslani49@yahoo.com
iran university of science and technology
aslanii.shabnam@gmail.com
hamidreza
rezaie
shabnam.aslani49@yahoo.com
iran university of science and technology
hrezaie@iust.ac.ir
alireza
khavandi
iran university of science and technology
khavandi@iust.ac.ir
10.22038/jdmt.2020.43842.1316
This study aimed to investigate the impact of N-vinylcaprolactam (NVC) and Nano-sized yttria-stabilized zirconia (YSZ), separately and simultaneously, on the mechanical properties of the commercial glass ionomer cements (GICs). <strong>Methods:</strong> The NVC is able to ameliorate the mechanical and surface properties of glass ionomers; however, its effect hasn’t been investigated in conjunction with zirconia yet. In order to perform the current research, the liquid of glass ionomer was synthesized by adding the NVC to its copolymer and then was characterized by proton nuclear magnetic resonance and Fourier transforms infrared. In addition, Nano-sized YSZ was added to the powder of glass ionomer and then was characterized by scanning electron microscopy. Afterward, the specimens for both flexural strength (FS) and microhardness were prepared by mixing the powder and liquid of the modified glass ionomer. Eventually, the aforementioned properties were evaluated after 24 h and 1 week of immersion in distilled water in an incubator. Furthermore, the one-way analysis of variance was used to study the statistical significance of FS. <strong>Results:</strong> The obtained results demonstrated that microhardness andFS properties of the glass ionomer were clearly improved as zirconia and NVC were added to the powder and liquid of the glass ionomer, respectively (P<0.05). Moreover, the best result was achieved for the group in which the modification of powder and liquid of glass ionomer occurred concurrently. <strong>Conclusion:</strong> Based on the findings of the present study, it was deduced that the modified GIC is a promising dental material with improved mechanical properties.
microhardness,Glass Ionomer,Flexural strength,N-vinylcaprolactam (NVC),Zirconia
https://jdmt.mums.ac.ir/article_14757.html
https://jdmt.mums.ac.ir/article_14757_c9f95e8d789f346945a8e586a7f1c57f.pdf
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
9
1
2020
03
01
Exploration of the Customized Fixtures for the Evaluation of Three-point Bending Strength of Dental Resin Composites
51
55
EN
Tooba
Farhan
Dr Ishrat-ul-Ebad Khan Institute of Oral Health Sciences, Dow University of Health Sciences, Karachi, Pakistan
toobafarhan20@hotmail.com
Naresh
Kumar
0000-0003-2030-6907
Dr Ishrat-ul-Ebad Khan Institute of Oral Health Sciences, Dow University of Health Sciences, Karachi, Pakistan.
kumar.naresh@duhs.edu.pk
Faiza
Amin
0000-0002-3924-9677
Dow Dental College Dow University of health Sciences Karachi, Pakistan
faiza.ameen@duhs.edu.pk
Syed Junaid
Mahmood
Plastic and Polymer Section, Applied Chemistry Research Centre, PCSIR Labs Complex, Karachi, Pakistan
junaid070880@gmail.com
10.22038/jdmt.2020.44057.1320
<strong>Introduction:</strong> This study aimed to devise customized fixtures for the evaluation of three-point bending strength (TPBS) of resin-based dental composites (RBCs). <strong>Materials and Methods:</strong> A cube-shaped jig made out of wood with dimensions of 105×105×101 mm was prepared in this study. A 20-mm-diameter hole was made in the center of the wooden jig. In addition, a stainless steel probe with 175mm length, 3mm thickness, and 2 mm width was fabricated and then fitted in the upper gripping crosshead of the universal testing machine. Subsequently, bar-shaped specimens of two commercial RBCs, namely Filtek Z350 XT Supreme Ultra Universal (Z350) and Premium Nano-Hybrid Composite (PN) were placed over the center of the jig hole and subjected to TPBS test in accordance with ISO 4049 standards protocol. <strong>Results</strong>: The mean TPBS values of Z350 and PN RBCs were 82 and 86 MPa, respectively. Moreover, the standard deviation values for both mean TPBS values were low indicating the homogeneity of the findings and associated reliability of the employed fixtures. <strong>Conclusion:</strong> The fixtures for the TPBS test of RBCs were successfully designed and developed which would likely facilitate the researchers with a mechanical characterization of dental materials. A machine used for the testing of large industrial materials other than small dimensional dental materials can now be used to test TPBS of RBCs according to ISO 4049 with the help of the invented economical fixtures. This will enhance the quality of teaching and learning of materials science in developing countries.
Customized fixtures,Fixtures,Resin-based composites,Three-point bending test,Universal testing machine,wooden jig
https://jdmt.mums.ac.ir/article_14641.html
https://jdmt.mums.ac.ir/article_14641_10ec387928100915fe226be0178635aa.pdf