Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
10
1
2021
03
01
Critical Appraisal of Studies Conducted in the Department of Periodontics, Mashhad School of Dentistry, in the Last Twenty Years (1994-2014)
1
15
EN
Majid Reza
Mokhtari
Assistant Professor, Department of Periodontics, Mashhad School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
drmokhtariperio@yahoo.com
amir
moeintaghavi
Professor, Department of Periodontics, Mashhad School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
moeentaghavia@mums.ac.ir
Hamid Reza
Arab
Professor, Department of Periodontics, Mashhad School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
arabh@mums.ac.ir
sabete
bagheri sabzevar
0000000230399150
Department of Endodontics, School of Dentistry, Tabriz University of Medical Sciences, Tabriz, Iran
sabetebagheri@gmail.com
10.22038/jdmt.2021.17651
Critical appraisal of research studies is an essential process in quality assessments and development, in which various aspects of a subject are carefully analyzed. In recent decades, many articles have been published in medical journals especially in dental field, without being officially criticized. Citing results of these epidemiological studies requires proper validation. The validation is performed through ‘critical appraisal’ according to standard criteria and checklists. In this paper, 81 studies conducted between 1994 and 2014 in periodontics field in dentistry were divided into five categories: observational studies, diagnostic, clinical, animal, and meta-analysis, and reviewed by STROBE, STARD, CONSORT, ARRIVE, PRISMA Checklists. In most studies, participants' characteristics and inclusion and exclusion criteria were mentioned. In most studies, random sampling was not performed without bias. It is hoped that in future studies, researchers will use standard checklists from the initial stages of the study to obtain valid and scientific results.
Critical appraisal,Research Studies,Periodontal
https://jdmt.mums.ac.ir/article_17651.html
https://jdmt.mums.ac.ir/article_17651_b42888a2ad0393c403e558411d0ad56c.pdf
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
10
1
2021
03
01
Radiographic Evaluation of Iatrogenic Errors of Root Canal Treatments Performed in an Undergraduate Dental Clinic
16
21
EN
Ensieh
Grayli
0000-0001-8574-6255
Assistant Professor of Endodontics, Department of Edndodontics, Gorgan School of Dentistry, Golestan University of Medical Sciences, Gorgan, Golestan, Iran
gerayli.e@goums.ac.ir
Alireza
Peyvandi
Dental Student, Gorgan School of Dentistry, Golestan University of Medical Sciences, Gorgan, Golestan, Iran
peyvandi.74@gmail.com
Maysa
Mallahi
Assistant Professor of Oral and Maxillofaxial Radiology, Department of Oral and Maxillofaxial Radiology, Gorgan School of Dentistry, Golestan University of Medical Sciences, Gorgan, Golestan, Iran
dr.mallahi.m@goums.ac.ir
Shabnam
Naeemi
Assistant Professor of Endodontics, Department of Edndodontics, Gorgan School of Dentistry, Golestan University of Medical Sciences, Gorgan, Golestan, Iran
naeemi.sh@goums.ac.ir
Elham
Afshari
0000-0002-3234-9720
Assistant Professor of Pediatric Dentistry, Department of Pediatric Dentistry, Gorgan School of Dentistry, Golestan University of Medical Sciences, Gorgan, Golestan, Iran
dr.afshari@goums.ac.ir
10.22038/jdmt.2021.17655
<strong>Introduction:</strong> Iatrogenic errors may occur during root canal treatments (RCTs) performed by undergraduate students. The current study explores the iatrogenic errors of RCTs made by undergraduate students at Gorgan School of Dentistry, Golestan, Iran.<strong> Methods: </strong>This cross-sectional study was conducted using 236 randomly selected treatment records of RCTs performed on first molars by undergraduate dental students. Periapical radiographs were independently explored for the following errors: overfilling, underfilling, legde formation, and apical transportation. Data analysis was performed using Statistical Package for Social Sciences (SPSS) version 17.0, and a Chi-square test at the 0.05 level of significance. <strong>Results:</strong> Periapical radiographs of 236 endodontically treated first molars were assessed. The results showed that 87.1% of root canals were adequately filled to the working length. Among the teeth treated by fifth- and sixth-year students, 62.5% and 66.4% of teeth were adequately filled to the working length, respectively, resulting in no statistically significant difference (P>0.05). In respect to the prevalence of ledge formation and apical transportation errors, there was no statistical difference either between the treatments performed by fifth- and sixth-year students (P>0.05) or the location of the treated tooth (mandible or maxilla) (P>0.05). <strong>Conclusion:</strong> Within the limitations of the present study, the results showed a rather low, but non-negligible prevalence of procedural errors in RCTs performed by fifth- and six-year undergraduate students at Gorgan School of Dentistry. Prevalence of errors made by fifth- and six-year students was similar.
Endodontics,Dental Student,Iatrogenic,Procedural Errors,Radiography
https://jdmt.mums.ac.ir/article_17655.html
https://jdmt.mums.ac.ir/article_17655_56325483f100fdc0888029ef5a648e78.pdf
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
10
1
2021
03
01
Microshear Bond Strength and Microleakage of a Restorative Composite Resin with Salivary Contamination at Different Time Intervals
22
27
EN
rasoul
sahebalam
Oral & Maxillofacial Diseases Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
sahebalamr@mums.ac.ir
Yeganeh
Arian
School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
ariany901@mums.ac.ir
alireza
boruziniat
0000-0001-7943-6306
Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
borouziniata@mums.ac.ir
Abdolrasoul
Rangrazi
0000-0002-6323-6112
Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
rangrazi.r@gmail.com
10.22038/jdmt.2021.17657
<strong>Introduction : </strong>Saliva contamination is an inevitable and common challenge in the field of restorative dentistry. Recognizing and considering the key time of isolation is an effective strategy to prevent the deleterious effects of salivary contamination. The purpose of this study was to evaluate the effect of salivary contamination in the course of light curing on microshear bond strength and microleakage of a restorative composite resin. <strong>Methods:</strong> 140 human third molars were divided into seven groups each containing 10 samples for measuring the microleakage and the microshear bond strength. The specimen of each group was contaminated with human saliva at a certain time, while group1 was contaminated in prior to light curing. The samples in groups 2 to 7 were contaminated with saliva at 2, 5, 10, 15, and 20 s after the start of light curing, respectively. The specimens of group7 were light cured and contaminated afterwards with human saliva. <strong>Results:</strong> According to the gathered results, the time of saliva contamination had significant negative effects on the microshear bond strength to the dentin and enamel in the course of light curing throughout the first 2s and 5s, respectively. It was indicated by the microleacage test that the saliva contamination in the first 2s, 5s, and 10s during light curing had a higher microleakage than the other times. <strong>Conclusion:</strong> In conclusion, during light curing of the composite resin, the first 10s was high sensitive to saliva contamination and therefore the isolation is very important in this time.
Saliva,Contamination,Composite Resin,Microshear,Microleakage
https://jdmt.mums.ac.ir/article_17657.html
https://jdmt.mums.ac.ir/article_17657_935130257e467be9643834601d30c71f.pdf
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
10
1
2021
03
01
Influence of Various Irrigation Protocols on Resistance to Vertical Root Fracture in Root Canal Treated Teeth
28
33
EN
Ezgi
Doganay Yildiz
0000-0003-4113-7794
Department of Endodontics, Faculty of Dentistry, Bursa Uludag University, Bursa, Turkey
dtezgidoganay@gmail.com
Mehmet
Eren
Fidan
Department of Endodontics, Faculty of Dentistry, Kırıkkale University, Kırıkkale, Turkey
merenfidan@gmail.com
Buket
Dincer
Department of Endodontics, Faculty of Dentistry, Kırıkkale University, Kırıkkale, Turkey
bktdincerr@gmail.com
10.22038/jdmt.2021.51819.1393
<strong>Introduction: </strong>This study compared influence of various irrigation protocols on vertical root fracture resistance of root canal treated teeth. <strong>Methods:</strong> Forty-eight extracted mandibular premolars were included in the study. The root canals of teeth were instrumented and specimens were allocated into 4 (n = 12) groups according to the irrigation solutions: Group 1: 5% EDTA, 2.5% NaOCl and DW; Group 2: 5% EDTA, 2.5% NaOCl, DW and 2% CHX; Group 3: 5% EDTA, 2.5% NaOCl and 5% Na<sub>2</sub>S<sub>2</sub>O<sub>3</sub>; Group 4: 5% EDTA, 2.5% NaOCl, 5% Na<sub>2</sub>S<sub>2</sub>O<sub>3</sub> and 2% CHX. Root canals were filled and a load in a vertical direction was applied a week later to specimens. The data were analysed using two-way ANOVA test (P < 0.05).<strong> Results:</strong> Interaction between using DW or Na<sub>2</sub>S<sub>2</sub>O<sub>3</sub> and using or not using CHX had a significant effect on fracture resistance to vertical forces (P < 0.001). Irrigation with Na<sub>2</sub>S<sub>2</sub>O<sub>3</sub> improves fracture resistance to vertical forces when compared to irrigation with DW (P < 0.001). Irrigation with CHX did not affect fracture resistance to vertical forces (P = 0.759). <strong>Conclusion:</strong> The irrigation solutions statistically affect resistance of root canal treated teeth to vertical fracture forces.
irrigation,final irrigation,sodium thiosulfate,fracture resistance
https://jdmt.mums.ac.ir/article_17591.html
https://jdmt.mums.ac.ir/article_17591_aa0d449e3bd83d28ff80edc96e7813a4.pdf
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
10
1
2021
03
01
Evaluation and Comparison of Newly Developed Phosphoric Acid Gel (Exir) with Two Different Common Gels in Iran
34
43
EN
Hamideh
Sadat
Mohammadipour
Assistant Professor, Dental Materials Research Center, Department of Cosmetic and Restorative Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
mohammadipourh@mums.ac.ir
majid
akbari
Professor, Department of Cosmetic and Restorative Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
akbarim@mums.ac.ir
Hossein
Bagheri
0000-0000-0000-0000
Assistant Professor, Dental Materials Research Center, Department of Cosmetic and Restorative Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
bagherih@mums.ac.ir
Mohammadtaghi
Malekmohammadi
Dentist, Mashhad, Iran
dr_mt_malek@yahoo.com
elnaz
karimian
0000-0002-7270-5478
Assistant Professor, Department of Cosmetic and Restorative Dentistry, Dental School, Shahid Sadoughi University of Medical Sciences, Yazd, Iran.
karimiane961@mums.ac.ir
Salehe
Sekandari
0000-0001-8190-915X
Assistant Professor, Dental Research Center, Department of Cosmetic and Restorative Dentistry, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
salehesekandari@yahoo.com
10.22038/jdmt.2021.51018.1388
<strong>Introduction</strong>: Different surface treatments were preposed to prepare the tooth structure for resin composite bonding. One of the most common preparation is using of phosphoric acid etching. This study conducted to determine the etching effectiveness of a new formulated acid etchant (Exir) and compared it with two commercial products. <strong>Methods:</strong> To determine the physical properties, the viscosity and shelf life were evaluated by a viscometer and a centrifuge over the time, respectively. SEM micrographs were uesd to show the geometry of bovine enamel and dentin surfaces which were treated by three etchants. The µSBS of composite to treated dental tissues was also investigated. Data were analyzed by ANOVA and Tukey test (α=0.05). <strong>Results:</strong> Exir etchant showed the lower viscosity compared with two other gels and two-phase separation did not significantly increase during suggested period. The SEM images of enamel samples treated with Exir etchant showed regular etching patterns and less remnant in comparison with other groups. The SEM mages of dentin samples treated with Exir etchant, unlike others, showed wide open dentin tubules with clear exposed collagen fibers. Enamel and dentin µSBS were 30.08±6.79 and 7.29±1.27 for Exir etchant, 23.31±6.64 and 8.49±3.61 for Morva Etch and 23.22±7.05 and 6.16±1.68 for Ultra-Etch, respectivley. The µSBS values for enamel was significantly higher in Exir treated group (P=0.017), while there was no significant difference in dentin µSBS values among three tested etchants (P=0.07). <strong>Conclusion:</strong> The results of this study showed Exir etchant can provide acceptable results used on dentin and enamel substrates.
Phosphoric acid,acid etching,Micro-shear bond strength,Etch pattern
https://jdmt.mums.ac.ir/article_17633.html
https://jdmt.mums.ac.ir/article_17633_0880e4b0cead7bd65ef234738f9f8624.pdf
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
10
1
2021
03
01
Retrospective Evaluation of Position of Mental Foramen and Its Relationship with Gonial Angle Using Cone Beam Computed Tomography
44
53
EN
Farzaneh
Ostovar Rad
0000-0002-2618-6056
Assistant professor, Dental sciences Research Center, Department of Dentomaxillofacial Radiology, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.
dr.f.ostovarrad@gmail.com
somaye
nemati
0000-0002-0442-4359
Assistant Professor, Dental Sciences Research Center, Department of oral and maxillofacial Radiology, Dental Faculty, Guilan University of Medical Sciences, Rasht, Iran.
nematis60@gmail.com
Zahra
Yousefi
0000-0001-7598-0478
Dental sciences Research Center, Department of Dentomaxillofacial Radiology, School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.
zahrayousefi71@yahoo.com
Nadia
Manavi
0000-0003-4133-9900
Dentist,Dental sciences Research Center,School of Dentistry, Guilan University of Medical Sciences, Rasht, Iran.
nadia.manavi@gmail.com
10.22038/jdmt.2021.49596.1378
<strong>Introduction</strong>: Mental foramen (MF) appearance is quite diverse. Failure to properly diagnose and protect the nerve may result in its damage during medical procedures such as surgery and placement of dental implants. This study evaluated the position of MF and its relationship with gonial angle using cone beam computed tomography (CBCT) images<strong>. Methods:</strong> 128 gonial angles from 64 CBCT images were measured and divided into low-angle (≤125°) and high-angle (>125°) categories. MF was divided into five types considering its position in cross-sectional profiles: type A (under apex of first premolar); B (under apex of second premolar); C (between first and second premolars); D (anterior to first premolar); and E(posterior to second premolar).The length of mental canal and its buccolingual and superior-inferior position was also evaluated. Independent T-test and Chi-square tests were used with statistical significance set at p Results: The highest frequency of MF position in the high and low-gonial angle categories was type C and the lowest in high-angle and low-angle were type E and D, respectively. The position of the foramen and measurements of the mental canal was not affected by age, gender, or gonial angle (P>0.05). <strong>Conclusion:</strong> Position of MF was not found to be related to patients’ age, sex, or gonial angles. Since a precise determination of the MF position is difficult due to its different anatomical variations and also because of potential damages during the treatment procedures in this area, radiographic analysis and determining its location among different populations is necessary.
mental foramen,gonial angle,Cone beam computed tomography
https://jdmt.mums.ac.ir/article_17626.html
https://jdmt.mums.ac.ir/article_17626_412f84e163a3af230a2b1367d0248cae.pdf
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
10
1
2021
03
01
The Impact of Mandibular Advancement Surgery on Upper Lip Length in Class II Patients
54
58
EN
seyed mohammad
mousavi
Assistant professor, Department of orthodontics, faculty of dentistry, Ahvaz Jundishapur university of medical sciences , Ahvaz , Iran
mosavim@yahoo.com
khadijeh
abdal
assistant professor , department oral and maxillofacial pathology . dental school ilam university of medical sciences .
dr.faribaabdal@yahoo.com
meysam
noori
Post graduate student, Department of orthodontics, faculty of dentistry, Ahvaz Jundishapur university of medical sciences , Ahvaz , Iran .
fariba4479@yahoo.com
Parisa
Kazemi
Assistant Professor, Department of Orthodontics, Faculty of Dentistry, Ilam University of Medical Sciences, Ilam, Iran
kazemip222@gmail.com
10.22038/jdmt.2021.17642
<strong>Introduction: </strong>One of the most common maxillofacial malformations is mandibular advancement, a class II malformation or malocclusion. One treatment is mandibular advancement surgery. This research aimed to investigate the effect of mandibular advancement surgery on upper lip length in class II patients. <strong>Methods:</strong> This retrospective study was conducted with 16 patients having class II malformations who underwent mandibular advancement surgery. Data analysis was conducted using SPSS 19. <strong>Results: </strong>Results showed that although height of philtrum increased after surgery, there was no significant difference in the height of the philtrum from before to after the mandibular advancement surgery (<em>p </em>> 0.05). Evaluation of the patients showed that although commissure height and vermilion height decreased after surgery, this difference was not statistically different(<em>p </em>> 0.05). However, there was a statistically significant difference between before and after commissure height (<em>p </em><0.05) at camouflage in patients. There was also a statistically significant difference in height of philtrum and vermilion between before and after camouflage in patients (<em>p </em><0.05). <strong>Conclusions:</strong> The results of this study suggest that mandibular advancement surgery plays a serious role in the clinical appearance of lip soft tissue, which can be used as a predictor of patient profile prior to surgery.
Lip vermilion,upper lip,Philtrum,Mandibular
https://jdmt.mums.ac.ir/article_17642.html
https://jdmt.mums.ac.ir/article_17642_0d4d50b16d2a663b75f65a9d6b41cb3a.pdf
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
10
1
2021
03
01
Evaluation of the Morphology of Mandibular Incisors using the Cone Beam Computed Tomography
59
61
EN
aida
eftekhari
Private Practice, Sabzevar, Iran
aidaeftekhari13@gmail.com
ali
Bagherpour
Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
bagherpour.ali@gmail.com
Hamid
Jafarzadeh
0000-0001-5318-7129
Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
hamid_j365@yahoo.com
10.22038/jdmt.2021.17664
<strong>Introduction: </strong>Cone beam computed tomography (CBCT) imaging was developed to provide an improved visual representation of hard dental tissues in three dimensions. This <em>in vitro</em> study aimed to evaluate the morphology of the roots and canals of the mandibular incisors using CBCT. <strong>Methods:</strong> In total, 100 extracted mandibular central incisors and 100 extracted mandibular lateral incisors were mounted on separate putty blocks, which were completely immobile during imaging. The teeth were imaged using the CBCT unit (kVp=70, mA=8, and exposure time of 12 s). Vertucci’s classification was utilized to record the number of roots and the canals in each root, as well as the type of the canals. <strong>Results:</strong> Almost all mandibular incisors were single-rooted. Among the mandibular central incisors, the most common canal morphology proved to be type 1 (51%), followed by type 3 (47%). Totally, 2% of the teeth represented type 2 within Vertucci’s classification. Furthermore, mandibular lateral incisors were more varied in terms of anatomical classification. The most common types were recorded as types 3 (55%) and 1 (41%). Moreover, types 6, 2, and 5 comprised 2% of the cases. <strong>Conclusion:</strong> A high percentage of mandibular incisors have two canals, and based on Vertucci’s classification, the most common anatomies of these teeth were types 1 and 3.
Mandibular incisor,Root canal morphology,Vertucci’s classification
https://jdmt.mums.ac.ir/article_17664.html
https://jdmt.mums.ac.ir/article_17664_bdb1077924889c7600448bc7a830b400.pdf