eng
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
2014-06-01
3
2
47
54
10.22038/jdmt.2014.2374
2374
A Review of Biopsy in Dentistry: Principles, Techniques, and Considerations
Massoumeh Zargaran
1
Department of Oral and Maxillofacial Pathology, Dental Research Center, Faculty of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran
Biopsy is a useful technique for definitive diagnosis of abnormal oral conditions and it must be performed carefully since any error may result in histopathologic misidentification of the lesion. Present study evaluated the most relevant literatures published between 1982 and 2012 in order to review existed guidelines of correct biopsy performance using scientific database sources such as PubMed, MEDLINE, IMEMR, and Chemical Abstract. The aim of this study was to increase knowledge of dental practitioners especially general dentists about factors which may influence optimization of oral biopsy.
https://jdmt.mums.ac.ir/article_2374_7e1d7b68450e6af288d07e1754f750c1.pdf
Biopsy
Dentistry
Histopathology
oral lesion
specimen
eng
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
2014-06-01
3
2
55
60
10.22038/jdmt.2014.2436
2436
Diode Laser and Calcium Hydroxide for Elimination of Enterococcus Faecalis in Root Canal
Neda Naghavi
1
Armita Rouhani
2
Sahar Irani
3
Nadia Naghavi
4
Elham Banihashemi
5
Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
2Department of Orthodontics, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
Department of Electrical Engineering, Ferdowsi University, Mashhad, Iran
General Dentist, Mashhad, Iran
Introduction: The ultimate goal of endodontic treatment is to eliminate the bacterial infection in the root canal system. While mechanical debridement combined with chemical irrigation removes the bulk of microorganisms, residual bacteria are readily detectable in approximately one-half of teeth just prior to obturation. Laser light can be used to destroy bacteria. This in vitro study was performed to evaluate the effect of diode laser and calcium hydroxide on mono-infected dental canals.Methods: Fifty five single-rooted human premolars were prepared and contaminated with Enterococcus faecalis. After three weeks of incubation, the samples were divided into three experimental groups (n = 15) and two control groups (n = 5). In the first and second groups, the teeth were rinsed for 5 min with either sterile saline or 5.25% NaOCl and irradiated with a 810-nm diode laser at 1.5 W output for 5 × 4s. In the third group, the teeth were rinsed with 5.25% NaOCl and then Ca(OH)2 paste was inserted in the canals for 1 week. Intracanal bacterial sampling was done and the samples were plated to determine the CFU count. Results: 5.25% NaOCl plus laser was as effective as calcium hydroxide and significantly more effective than sterile saline (P>0.05) in elimination of E. faecalis. Complete elimination of E. faecalis was seen only for the one week calcium hydroxide treatment. Conclusion: Combination therapy with NaOCl irrigation and diode laser irradiation can be recommended as an effective treatment option for elimination of E. faecalis from the root canal system.
https://jdmt.mums.ac.ir/article_2436_c88934f0004dc783ab8c515674d53f73.pdf
Antibacterial properties
Calcium hydroxide
Diode laser
Enterococcus faecalis
eng
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
2014-06-01
3
2
61
65
10.22038/jdmt.2014.2378
2378
Are Bonding Agents being Effective on the Shear Bond Strength of Orthodontic Brackets Bonded to the Composite?
Fahimeh Farzanegan
1
Behrad Tanbakuchi
2
1 Dental Research Center, Department of Orthodontics, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
Department of Orthodontics, Mashhad University of Medical Sciences, Mashhad, Iran
Introduction: One of the clinical problems in orthodontics is the bonding of brackets tocomposite restorations. The aim of this study was to evaluate the shear bondstrength of brackets bonded to composite restorations using Excite. Methods:Forty brackets were bonded to composite surfaces, which were embedded inacrylic resin. One of the following four protocols was employed for surfacepreparation of the composite: group 1) 37% phosphoric acid for 60 seconds, group2) roughening with a diamond bur plus 37% phosphoric acid for 60 seconds, group3) 37% phosphoric acid for 60 seconds and the applying Excite®, group4) roughening with diamond bur plus 37% phosphoric acid for 60 seconds andapplying Excite®. Maxillary central brackets were bonded onto thecomposite prepared samples with Transbond XT. Shear Bond Strength (SBS) wasmeasured by a universal testing machine. The ANOVA and Tukey test was utilizedfor data analysis. Results: There was a significant difference betweenthe four groups (P<.000). The lowest and highest SBS were attributed to theGroup 1 and Group 4 respectively. There was no significant difference betweenGroups 1 & 3, 2 & 3 and 2 & 4. However, differences between Group 1in comparison with Groups 2 and 4 and Group 3 with Group 4 were statisticallysignificant. Conclusion: According to the results of this study, theusage of Excite® alone beforebonding brackets tocomposite restorations does not cause an increase in bond strength. However,roughening the composite surface before applying Excite is very effective forimproving the bond strength of orthodontic brackets to composite restorations
https://jdmt.mums.ac.ir/article_2378_70eb20133c2666fa07a890050c4090a2.pdf
Bond Strength
composite restorations
orthodontic brackets
eng
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
2014-06-01
3
2
66
70
10.22038/jdmt.2014.2381
2381
Technical Quality of Root Fillings Performed by Dental Students in Babol Dental School
Maryam Ehsani
1
Farida Abesi
2
Tania Ghasemi
tani@yahoo.com
3
Dental Material Research Center, Department of Endodontics, Dental Faculty, Babol University of Medical Sciences, Babol, Iran
Dental Material Research Center, Department of Oral & Maxillofacial Radiology, Dental Faculty, Babol University of Medical Sciences, Babol, Iran
Student Research Committee of Babol University, Dental Faculty, Babol University of Medical Sciences, Babol, Iran
Introduction: There is substantial evidence that the technical quality of root canalfilling has a significant effect on the outcome of root canal treatment. Theaim of this study was to evaluate the technical quality of root canal fillingsperformed by dental students. Methods: The records of 325 teethradiographs, treated by dental students in 2008-2009 in Babol Dental School,were selected and evaluated. For each tooth, three periapical radiographs(before treatment, during operation and at the end of treatment) were examined.Filling length, density and taper, and presence or absence of void wasevaluated. Obturations that have proper length, density and taper, without anyvoid are classified as acceptable root canal fillings. The SPSS statisticalsoftware and Chi-Square test were used for analysis. Results: Of the 325radiographs, 72% had good length and 75% had acceptable taper. There were 14.2%low densities, whereas, only 3.32% of teeth have no void. At least 17.8% ofteeth had underfilling and 10.2% overfilling. Finally, only 17.5% of teethshowed acceptable filling length, taper and density without any void. There wasno significant difference between the 4th and 5th yearstudents and oral hygienist (who studied oral hygiene and now continuing it todentistry) in root canal filling quality (P> 0.05). Conclusion:Technical quality of root fillings performed by dental students was found to beless than 20%. .It should be revised in the endodontic curriculum requirementto improve their performance
https://jdmt.mums.ac.ir/article_2381_aad4763a7dd0ae2541ff2d481b222489.pdf
Dental students
periapical radiographs
Quality
Root canal treatment
eng
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
2014-06-01
3
2
71
76
10.22038/jdmt.2014.2382
2382
Comparison of Inferior Dental Nerve Block Injections in Child Patients Using 30-Gauge and 27-Gauge Short Needles
Davoud Ghasemi
d.ghasemi@khuisf.ac.ir
1
sara Rajaei
sara.rajai61@yahoo.com
2
Ershad Aghasizadeh
fdfg@yahoo.com
3
Department of Pedodontics, Dental Faculty of Islamic Azad University of Khorasgan, Isfahan Branch, Iran
Department of Pedodontics, Dental Faculty of Islamic Azad University of Khorasgan, Isfahan Branch, Iran
Periodontologist, Mashhad, Iran
Introduction: The purpose of the present study was to record their pain sensation and to assess children`s reaction objectively and subjectively while receiving dental local anesthesia with 27- and 30-gauge needles. Methods: Forty children (24 boys and 16 girls) participated in this study. A random double-blinded crossover design was used so that each child served as his or her own control, receiving each treatment on the same sides of the same arch at different sessions. Each patient received an injection either with a 27- or 30-gauge needle during the second visit and during the third visit with the other needle. Objective and subjective evaluations were performed. Results: Children`s reactions to mandibular nerve block with 27- or 30-gauge needle regarding SEM scale and Face scale demonstrated significant difference, whereas children receiving the injection with a 27-gauge needle presented more sensation of pain objectively and subjectively. Conclusion: Significant difference was demonstrated concerning pain when 27-gauge or 30-gauge needle was used, and no difference was found in success of local anesthesia. As to these two variables, measured and reported in this study, it can be concluded that 30-gauge needle exhibit clinical advantage in inferior dental injection in children.
https://jdmt.mums.ac.ir/article_2382_788e254a2d3312e56455b4b821aa4f9a.pdf
Face scale
inferior dental nerve block
30-gauge needle
27-guage needle
SEM scale
eng
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
2014-06-01
3
2
77
81
10.22038/jdmt.2014.2385
2385
The effects of Exposure Times and Light Curing Sources on Surface Micro-Hardness of a Resin Modified Glass Ionomer
Iman Parisay
1
Zahra Bahrololomi
2
Maryam Ghafournia
ghafournia_m@yahoo.com
3
Ali-Asghar Solaimani
4
Alireza Boruziniat
5
Department of Pediatric Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
Department of Pediatric Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran
Department of Pediatric Dentistry, Esfahan University of Medical Sciences, Esfahan, Iran
Department of Pediatric Dentistry, International Branch of Tehran University of Medical Sciences, Tehran, Iran
Restorative Dentistry, Dental Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
Introduction: The aim of this study was to evaluate the influenceof different light curing systems and curing times on the micro-hardness of aresin modified glass ionomer. Methods: Forty two samples of ResinModified Glass Ionomer (RMGI) were prepared using stainless steel cylindrical mold(8 × 2 mm) and randomly divided into six groups of seven. Three groups werecured with a Quartz Tungsten Halogen (QTH) light cure unit and the other threegroups were polymerized with LED unit for 20, 30 and 40 seconds. All sampleswere stored in distilled water for 24 hours. The micro-hardness was measured onthe top and bottom surfaces of the samples by Vickers hardness tester. Datawere analyzed by two–way ANOVA and Tukey’s post-hoc tests. Results: Two-wayANOVA showed that QTH light-cure unit had higher percentage in depth of curethan LED light-curing unit in both surfaces; whereas, the application time hasno significant effect on it. There was no interaction between two variables. Inboth light-curing groups, the values of top and bottom surfaces micro-hardnesswere increased as the application time increased, but there was not anystatistically significant difference among these groups except for 40-second groupof LED light-curing unit which was significantly higher than 20-second and30-second groups (P<0.05). The micro-hardness value of QTH light-curing unitwas higher than LED light-curing unit. Conclusion: The application ofQTH light-curing unit for at least 20 seconds produces sufficient micro-hardness and depth of cureof RMGI
https://jdmt.mums.ac.ir/article_2385_571b1813b091ae32b94fc7c859f054cd.pdf
Glass Ionomer
light curing unit
micro-hardness
eng
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
2014-06-01
3
2
82
86
10.22038/jdmt.2014.2388
2388
Orthodontic Management of a Severely Rotated Maxillary Central Incisor in the Mixed Dentition: A Case Report
Arezoo Jahanbin
1
Behrad Tanbakuchi
2
1 Dental Research Center, Department of Orthodontics, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
Department of Orthodontics, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
The aim of this case report was to introduce an appliance for correcting severe rotation of anterior teeth in the mixed dentition period. A 9-year-old Iranian boy with a mixed dentition Class I malocclusion complained of a severely rotated of upper right central incisor. There was a mesiodens between the central incisors. The supernumerary tooth was first extracted and then a Whip appliance which is composed of a removable plate, a cantilever spring and a central bracket on the rotated tooth was utilized. After 8 months, the upper right central incisor was orthodontically brought into proper alignment. Circumferential supracrestal fibrotomy was performed on the overcorrected tooth. One week after surgery, the device was removed and the retention was started. The whip appliance is a removable appliance that can effectively correct severe rotation of anterior teeth especially during the mixed dentition period.
https://jdmt.mums.ac.ir/article_2388_233de853debef1a27dae4efe2bb318b2.pdf
Orthodontics
rotation
whip appliance
eng
Mashhad University of Medical Sciences
Journal of Dental Materials and Techniques
2322-4150
2252-0317
2014-06-01
3
2
87
90
10.22038/jdmt.2014.2389
2389
Treatment Plan and Clinical Management of a Geminated Maxillary Lateral Incisor: A Case Report
Siavash Moushekhian
moushekhians@mums.ac.ir
1
Masoud Shiehzadeh
shiezadehm@mums.ac.ir
2
Amir Shammas
amirshammas@yahoo.com
3
Department of Endodontics, Dental Research Center, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
Department of Prosthodontics, Dental Research Center, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
Department of Periodontics, Faculty of Dentistry, Bojnord University of Medical Sciences, Bojnurd, Iran
The anatomic anomalies detection is important for an attentive clinician. Asuccessful treatment of an endodontically involved tooth should make itfunctional and aesthetically acceptable for the patient. The following articlepresented a case of gemination and the endodontic, prosthetic and periodontaltreatments which were done to keep a complicated tooth in aesthetic zone
https://jdmt.mums.ac.ir/article_2389_a126d9eb39da4a73756813dc05feeb45.pdf
Clinical management
germination
maxillary lateral incisor