Shiraz University of Medical Sciences
Journal of Dentistry
2345-6485
2345-6418
17
2
2016
06
01
miRNAs Signature in Head and Neck Squamous Cell Carcinoma Metastasis: A Literature Review
71
83
EN
Soussan
Irani
0000-0003-3679-0449
Dental Research Center, Dept. of Oral and Maxillofacial Pathology, School of Dentistry, Hamadan University of Medical Sciences, Hamadan, Iran. and Lecturer at Griffith University, Gold Coast, Australia.
sousanirani@gmail.com
Statement of the Problem: Head and neck cancers include epithelial tumors arising in the oral cavity, pharynx, larynx, paranasal sinuses, and nasal cavity. Metastasis is a hallmark of cancer. MicroRNAs (miRNAs) are endogenous small non-coding RNAs involved in cell proliferation, development, differentiation and metastasis. It is believed that miRNA alterations correlate with initiation and progression of cancer cell proliferation or inhibition of tumorigenesis. Moreover, miRNAs have different roles in development, progression, and metastasis of head and neck squamous cell carcinoma (HNSCC). Altered expression of miRNAs could be novel molecular biomarkers for the definite diagnosis of cancer, metastatic site, cancer stage, and its progression.Purpose: The purpose of this review was to provide a comprehensive literature review of the role of miRNAs in head and neck cancer metastasis.Search strategy: A relevant English literature search in PubMed, ScienceDirect, and Google Scholar was performed. The keywords ‘miRNA’, ‘head and neck’, and ‘cancer’ were searched in title and abstract of publications; limited from 1990 to 2015. The inclusion criterion was the role of miRNAs in cancer metastasis. The exclusion criterion was the other functions of miRNAs in cancers. Out of 15221 articles, the full texts of 442 articles were retrieved and only 133 articles met the inclusion criteria.Conclusion: Despite the advances in cancer treatment, the mortality rate of HNSCC is still high. The potential application of miRNAs for cancer therapy has been demonstrated in many studies; miRNAs function as either tumor suppressor or oncogene. The recognition of metastamir and their targets may lead to better understanding of HNSCC oncogenesis, and consequently, development of new therapeutic strategies which is a necessity in cancer treatment. Development of therapeutic agents based on miRNAs is a promising target. Keywords ● Head and Neck Cancer ● Metastasis ● miRNA
https://dentjods.sums.ac.ir/article_41690.html
https://dentjods.sums.ac.ir/article_41690_2d7041a927bb5fa5b3013aa8f0c9455f.pdf
Shiraz University of Medical Sciences
Journal of Dentistry
2345-6485
2345-6418
17
2
2016
06
01
In Vitro Comparison of Cone Beam Computed Tomography with Digital Periapical Radiography for Detection of Vertical Root Fracture in Posterior Teeth
84
90
EN
Mehrdad
Abdinian
0000-0002-6893-8121
Dental Implants Research Center, Dept. of Oral and Maxillofacial Radiology, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
abdinian@dnt.mui.ac.ir
Hamid
Razavian
Torabinejad Dental Research Center, Dept. of Endodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Nastaran
Jenabi
Postgraduate Student, Dept. of Orthodontics, Dental School, Isfahan (Khorasgan) Branch, Islamic Azad University, Isfahan, Iran.
nastaran.1990@gmail.com
Statement of the Problem: The diagnosis of vertical root fracture (VRF) is a challenging task.Purpose: This in vitro study compared cone beam computed tomography (CBCT) imaging with digital periapical radiography (DPR) made by three different horizontal angels (20°mesial, 0° and 20° distal) for accurate diagnosis of VRF.Materials and Method: Among 120 posterior teeth included in this study, 60 were vertically fractured. Fractured and non-fractured teeth were randomly distributed into three groups defined as group 1 with no filling in the root canal, group 2 with gutta-percha in the canal, and group 3 with the intracanal post. All samples were placed in a dry mandible and imaged with CBCT and DPR techniques. Two blind observers investigated the images.Results: CBCT had higher sensitivity but lower specificity compared with DPR, except for the intracanal post group in which the sensitivity of DPR was higher; though the chi-square test showed the differences to be statistically insignificant. The sensitivity, specificity, and accuracy of CBCT and DPR were reduced in the cases that gutta-percha or post were present in the canal. Inter-observer agreement was higher for CBCT. A set of three DPRs with different horizontal angels were significantly more sensitive for VRF recognition than a single orthogonal DPR.Conclusion: Based on our results, there was no significant difference between CBCT and a set of three DPRs with different angulations for VRF detection in posterior teeth. Therefore, it is suggested to consider DPRs with three different horizontal angels (20°mesial, 0° and 20° distal) for radiographic evaluation before CBCT examination.Keywords ● Cone-Beam Computerized Tomography ● Dental Digital Radiography ● Tooth Fracture ● Diagnosis
https://dentjods.sums.ac.ir/article_41689.html
https://dentjods.sums.ac.ir/article_41689_4bf6fd95de8a8e697e1edefecceae95c.pdf
Shiraz University of Medical Sciences
Journal of Dentistry
2345-6485
2345-6418
17
2
2016
06
01
The Comparison of Sorption and Solubility Behavior of Four Different Resin Luting Cements in Different Storage Media
91
97
EN
Rashin
Giti
0000-0003-1091-9574
Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
rashingiti@yahoo.com
Mahroo
Vojdani
Biomaterials Research Centre, Dept. of Prosthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
vojdanim@sums.ac.ir
Jaafar
Abduo
Dept. of Restorative Dentistry, Melbourne Dental School, Melbourne University, Victoria, Australia.
Rafat
Bagheri
Dept. of Dental Materials and Biomaterials Research Centre, School of Dentistry, Shiraz University of Medical Scienc-es, Shiraz, Iran.
bagherir@yahoo.edu.au
Statement of the Problem: Structural integrity and dimensional stability are the key factors that determine the clinical success and durability of luting cements in the oral cavity. Sorption and solubility of self-adhesive resin luting cements in food-simulating solutions has not been studied sufficiently.Purpose: This study aimed to compare the sorption and solubility of 2 conventional and 2 self-adhesive resin-based luting cements immersed in four different storage media.Materials and Method: A total of 32 disc-shaped specimens were prepared from each of four resin luting cements; seT (SDI), Panavia F (Kuraray), Clearfil SA Cement (Kuraray), and Choice 2 (Bisco). Eight specimens of each material were immersed in all tested solutions including n-heptane 97%, distilled water, apple juice, or Listerine mouth wash. Sorption and solubility were measured by weighing the specimens before and after immersion and desiccation. Data were analyzed by SPSS version 18, using two-way ANOVA and Tukey’s HSD test with p≤ 0.05 set as the level of significance.Results: There was a statistically significant interaction between the materials and solutions. The effect of media on the sorption and solubility was material-dependent. While seT showed the highest values of the sorption in almost all solutions, Choice 2 showed the least values of sorption and solubility. Immersion in apple juice caused more sorption than other solutions (p≤ 0.05).Conclusion: The sorption and solubility behavior of the studied cements were significantly affected by their composition and the storage media. The more hydrophobic materials with higher filler content like Choice 2 resin cement showed the least sorption and solubility. Due to their lower sorption and solubility, these types of resin-based luting cements are recommended to be used clinically. Keywords ● Storage Media ● Sorption and Solubility ● Resin Luting Cements
https://dentjods.sums.ac.ir/article_41692.html
https://dentjods.sums.ac.ir/article_41692_dd1f498005b0ab67e605bb0c7f4cce89.pdf
Shiraz University of Medical Sciences
Journal of Dentistry
2345-6485
2345-6418
17
2
2016
06
01
A Comparative Study of Cathepsin D Expression in Peripheral and Central Giant Cell Granuloma of the Jaws by Immunohistochemistry Technique
98
104
EN
Massoumeh
Zargaran
0000-0002-8843-2590
Dental Research Center, Dept. of Oral and Maxillofacial Pathology, Dental School, Hamadan University of Medical Sciences, Hamadan, Iran.
massoumehzargaran@gmail.com
Abbas
Moghimbeigi
0000-0002-3803-3663
Modeling of Noncommunicable Disease Research Center, Dept. of Biostatistics and Epidemiology, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran.
moghimb@yahoo.com
Noushin
Afsharmoghadam
Dept. of Pathology, AL Zahra Medical Center, Isfahan University of Medical Sciences, Isfahan, Iran.
afsharmoghadam-n@yahoo.com
Mohsen
Nasr Isfahani
Pathology Technologist, Dept. of Pathology, AL Zahra Medical Center, Isfahan University of Medical Sciences, Isfahan, Iran.
nasreisfahanim@yahoo.com
Atefeh
Hashemi
Dept. of Oral and Maxillofacial Pathology, Dental School, Arak University of Medical Sciences, Arak, Iran.
dr.hashemi91@yahoo.com
Statement of the Problem: Peripheral and central giant cell granuloma are two common benign lesions of the oral cavity. In spite of histopathological similarities, they have different clinical behaviors. Cathepsin D is a lysosomal enzyme which has different functions on the basis of protein and applied peptide cleavage.Purpose: This research aimed to evaluate and compare the expression level of Cathepsin D in these two lesions to find the reasons for the differences in clinical and biologic characteristics.Materials and Method: The expression of Cathepsin D was investigated by using the immunohistochemistry method in 20 samples of peripheral giant cell granuloma and 20 samples of central giant cell granuloma. The percentage of stained giant cells (labeling index), the intensity of staining of giant cells, and staining-intensity-distribution in both groups were calculated and compared.Results: The labeling indices of Cathepsin D in peripheral giant cell granuloma and central giant cell granuloma were 95.9±4.03 and 95.6±2.34, respectively. There was no significant difference in the percentages of stained giant cells between the two groups (p= 0.586). The intensity of staining of giant cells in central giant cell granuloma was stronger than that of peripheral giant cell granuloma (p> 0.001). Staining- intensity- distribution of giant cells in central giant cell granuloma was significantly greater than that of the peripheral type of lesion (p= 0.001).Conclusion: The higher expression level of Cathepsin D in central giant cell granuloma compared to peripheral type of lesion can explain more aggressive behavior of central giant cell granuloma. Keywords ● Giant Cell Granuloma ● Cathepsin D ● Immunohistochemistry ● Jaw
https://dentjods.sums.ac.ir/article_41694.html
https://dentjods.sums.ac.ir/article_41694_ef4549c5915d01acaa62edc032b99ce2.pdf
Shiraz University of Medical Sciences
Journal of Dentistry
2345-6485
2345-6418
17
2
2016
06
01
Flexural Strength Comparison of Silorane- and Methacrylate-Based Composites with Pre-impregnated Glass Fiber
105
111
EN
Maryam
Doozandeh
Dept. of Operative Dentistry, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
mdoozandeh@sums.ac.ir
Ali Asghar
Alavi
Dept. of Operative Dentistry and Biomaterials Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
alavia@sums.ac.ir
Zahra
Karimizadeh
Undergraduate Dental Student, Biomaterials Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
zahra_kmz69@yahoo.com
Statement of the Problem: Sufficient adhesion between silorane/methacrylate-based composites and methacrylate impregnated glass fiber increases the benefits of fibers and enhances the mechanical and clinical performance of both composites.Purpose: The aim of this study was to evaluate the compatibility of silorane and methacrylate-based composites with pre-impregnated glass fiber by using flexural strength (FS) test.Materials and Method: A total of 60 bar specimens were prepared in a split mold (25×2×2 mm) in 6 groups (n=10). In groups 1 and 4 (control), silorane-based (Filtek P90) and nanohybrid (Filtek Z350) composites were placed into the mold and photopolymerized with a high-intensity curing unit. In groups 2 and 5, pre-impregnated glass fiber was first placed into the mold and after two minutes of curing, the mold was filled with respective composites. Prior to filling the mold in groups 3 and 6, an intermediate adhesive layer was applied to the glass fiber. The specimens were stored in distilled water for 24 hours and then their flexural strength was measured by 3 point bending test, using universal testing machine at the crosshead speed of 1 mm/min. Two-way ANOVA and post-hoc test were used for analyzing the data (p< 0.05).Results: A significant difference was observed between the groups (p< 0.05). The highest FS was registered for combination of Z350 composite, impregnated glass fiber, and application of intermediate adhesive layer .The lowest FS was obtained in Filtek P90 alone. Cohesive failure in composite was the predominant failure in all groups, except group 5 in which adhesive failure between the composite and fiber was exclusively observed.Conclusion: Significant improvement in FS was achieved for both composites with glass fiber. Additional application of intermediate adhesive layer before composite build up seems to increase FS. Nanohybrid composite showed higher FS than silorane-based composite. Keywords ● Flexural Strength ● Pre-impregnated Glass Fiber ● Nanohybrid Composite ● Silorane-based Composite
https://dentjods.sums.ac.ir/article_41695.html
https://dentjods.sums.ac.ir/article_41695_fe5cc63c2e47ca8744498e21713e661a.pdf
Shiraz University of Medical Sciences
Journal of Dentistry
2345-6485
2345-6418
17
2
2016
06
01
An Analysis of Visibility and Anatomic Variations of Mandibular Canal in Digital Panoramic Radiographs of Dentulous and Edentulous Patients in Northern Iran Populations
112
120
EN
Somayeh
Nemati
0000-0002-0442-4359
Dept. of Dentomaxillofacial Radiology, Dental Faculty, Guilan University of Medical Sciences, Rasht, Iran.
nematis60@gmail.com
Anahita
Ashouri Moghaddam
Dept. of Periodontology, Dental Faculty, Guilan University of Medical Sciences, Rasht, Iran.
anahita.a.moghaddam@gmail.com
Zahra
Dalili Kajan
0000-0003-0726-380X
Dept. of Dentomaxillofacial Radiology, Dental Faculty, Guilan University of Medical Sciences, Rasht, Iran.
zahradalili@yahoo.com
Seyedeh Tahereh
Mohtavipour
Dept. of Dentomaxillofacial Radiology, Dental Faculty, Guilan University of Medical Sciences, Rasht, Iran.
Hasan
Amouzad
Dentist, Rasht, Iran.
Statement of the Problem: Insufficient information about the anatomical positions and structure of mandibular canal provokes unwanted damage to this important structure of mandible.Purpose: The aim of this study was to determine the visibility and anatomical variations of mandibular canal in digital panoramic radiographs of dentulous and edentulous patients in a sample of Iranian population.Materials and Method: In this retrospective-analytical research, 249 digital panoramic radiographs in dentulous group and 126 in edentulous group were studied by an expert oral and maxillofacial radiologist. In both groups, the visibility of canal borders in anterior, middle, and posterior areas were examined. In dentulous group, the distance between the canal and apex of the first and second molars were measured. Canal-to-alveolar crest distance and lower mandibular border was measured in three different points for both groups. Finally, the upper-lower positions of canals were determined.Results: In both groups, most visibility occurred in 1/3 of posterior and the least visibility was detected in 1/3 of anterior, with the intermediate being the most visible part (Type 2). There was no significant difference between the left and right sides in all cases. In dentulous group, no correlation was found between the visibility, age, and gender (p> 0.05); however, canal position was related to gender (p= 0.03 and p= 0.04 in right and left sides, respectively). High position was more frequent in females and intermediate position was more common in males. In edentulous group, no correlation was found between age, gender, and canal position (p> 0.05).Conclusion: The most visibility of mandibular canal was in its third posterior and the least was in its third anterior part. Although the middle position of canal was more frequently visible than the high position in this study, it does not refute the possibility of damaging the mandibular canal in critical surgeries. Keywords ● Panoramic Radiography ● Digital Radiography ● Edentulous ● Jaw ● Mandible
https://dentjods.sums.ac.ir/article_41696.html
https://dentjods.sums.ac.ir/article_41696_91199944e8e42a60cf6de1b4d030cc43.pdf
Shiraz University of Medical Sciences
Journal of Dentistry
2345-6485
2345-6418
17
2
2016
06
01
Effect of Nanoclay on Thermal Conductivity and Flexural Strength of Polymethyl Methacrylate Acrylic Resin
121
127
EN
Tahereh
Ghaffari
0000-0003-1775-432x
Periodontal Research Center, Dept. of Prosthodontics, Tabriz University of Medical Sciences, Tabriz, Iran.
tahereh_ghaffari@yahoo.com
Ali
Barzegar
Dept. of Prosthodontics, Faculty of Dentistry, Qom University of Medical Sciences, Qom, Iran.
alibarzegar38@gmail.com
Fahimeh
Hamedi Rad
Periodontal Research Center, Dept. of Prosthodontics, Tabriz University of Medical Sciences, Tabriz, Iran.
f.hamedirad@yahoo.com
Elnaz
Moslehifard
Periodontal Research Center, Dept. of Prosthodontics, Tabriz University of Medical Sciences, Tabriz, Iran.
e.moslehi@yahoo.com
Statement of the Problem: The mechanical and thermal properties of polymethyl methacrylate (PMMA) acrylic resin should be improved to counterweigh its structural deficiencies.Purpose: The aim of this study was to compare the flexural strength and thermal conductivity of conventional acrylic resin and acrylic resin loaded with nanoclay.Materials and Method: The methacrylate monomer containing the 0.5, 1 and 2 wt% of nanoclay was placed in an ultrasonic probe and mixed with the PMMA powder. Scanning electron microscopy was used to verify homogeneous distribution of particles. Twenty-four 20×20×200-mm cubic samples were prepared for flexural strength test; 18 samples containing nanoclay and 6 samples for the control group. Another 24 cylindrical samples of 38×25 mm were prepared for thermal conductivity test. One-way ANOVA was used for statistical analysis, followed by multiple-comparison test (Scheffé’s test). Statistical significance was set at p< 0.05.Results: Increasing the concentration of nanoclay incorporated into the acrylic resin samples increased thermal conductivity but decreased flexural strength (p< 0.05).Conclusion: Based on the results of this study, adding nanoclay particles to PMMA improved its thermal conductivity, while it had a negative effect on the flexural strength. Keywords ● Polymethyl Methacrylate ● Nanoparticles ● Thermal Conductivity ● Flexural Strength
https://dentjods.sums.ac.ir/article_41697.html
https://dentjods.sums.ac.ir/article_41697_17f03171026b9f1d9b5555d00cb72ac2.pdf
Shiraz University of Medical Sciences
Journal of Dentistry
2345-6485
2345-6418
17
2
2016
06
01
The Effect of Various Mixing Techniques on the Push-Out Bond Strength of Calcium Enriched Mixture
128
133
EN
Nooshin
Sadat Shojaee
0000-0003-4407-3650
Dept. of Endodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
shojaeen@sums.ac.ir
Alireza
Adl
Dept. of Endodontics and Biomaterials Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Fereshte
Sobhnamayan
Dept. of Endodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
sobhf@sums.ac.ir
Fatima
Vasei
Undergraduate Student, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
fvj_anjell@yahoo.com
Statement of the Problem: Correct proportioning and mixing are essential to ensure cements attain their optimum physical properties.Purpose: The aim of this experimental study was to evaluate the influence of various mixing techniques including manual, mechanical mixing, and ultrasonic vibration on push-out bond strength of calcium enriched mixture (CEM).Materials and Method: Ninety 2-mm-thick dentin disks were prepared from single-rooted human teeth and filled with CEM mixed with manual, trituration, or ultrasonic methods. Push-out bond strength values of the specimens were measured by a universal testing machine after 3 and 21 days. The samples were then examined under a stereomicroscope at 40× magnification to determine the nature of bond failure. Data were analyzed by Kruskal-Wallis and Mann-Whitney test. (p< 0.05)Results: The highest (7.59 MPa) and lowest (4.01 MPa) bond strength values were recorded in conventional method (after 21 days) and trituration method (after 3 days), respectively. There was no statistically significant difference between the three techniques in 3 and 21 days.Conclusion: According to the results, various mixing techniques had no effect on the push-out bond strength of CEM cement. Keywords ● Calcium Enriched Mixture ● Push-out Bond Strength ● Mixing Method ● Ultrasonic
https://dentjods.sums.ac.ir/article_41698.html
https://dentjods.sums.ac.ir/article_41698_9550f21f9ed2eac45652f0c5f6862fd8.pdf
Shiraz University of Medical Sciences
Journal of Dentistry
2345-6485
2345-6418
17
2
2016
06
01
Is Mandibular Fossa Morphology and Articular Eminence Inclination Associated with Temporomandibular Dysfunction?
134
141
EN
Maryam
Paknahad
0000-0002-9022-6518
Prevention of Oral and Dental Disease Research Center, Dept. of Oral and Maxillofacial Radiology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
paknahadmaryam@yahoo.com
Shoaleh
Shahidi
Dept. of Oral and Maxillofacial Radiology and Biomaterials Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
shoalehshahidi@yahoo.com
Marzieh
Akhlaghian
Undergraduate Student, Dept. of Oral Radiology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
akhlaghianm@yahoo.com
Masoud
Abolvardi
Undergraduate Student, Dept. of Oral Radiology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
abolvardi@sums.ac.ir
Statement of the Problem: Finding a significant relationship between temporomandibular joint (TMJ) morphology and the incidence of temporomandibular dysfunction (TMD) may help early prediction and prevention of these problems.Purpose: The purpose of the present study was to determine the morphology of mandibular fossa and the articular eminence inclination in patients with TMD and in control group using cone beam computed tomography (CBCT).Materials and Method: The CBCT data of bilateral TMJs of 40 patients with TMD and 23 symptom-free cases were evaluated. The articular eminence inclination, as well as the glenoid fossa depth and width of the mandibular fossa were measured. The paired t-test was used to compare these values between two groups.Results: The articular eminence inclination and glenoid fossa width and depth were significantly higher in patients with TMD than in the control group (p < 0.05).Conclusion: The articular eminence inclination was steeper in patients with TMD than in the control group. Glenoid fossa width and depth were higher in patients with TMD than that in the control group. This information may shed light on the relationship between TMJ morphology and the incidence of TMD. Keywords ● Cone Beam Computed ● Tomography ● Temporomandibular Joint ● Temporomandibular Joint Disorder ● Eminence
https://dentjods.sums.ac.ir/article_41699.html
https://dentjods.sums.ac.ir/article_41699_7c140a20ca298de4dfcbc708b2e79a84.pdf
Shiraz University of Medical Sciences
Journal of Dentistry
2345-6485
2345-6418
17
2
2016
06
01
Evaluation of Shear Bond Strength of Methacrylate- and Silorane-based Composite Resin Bonded to Resin-Modified Glass-ionomer Containing Micro- and Nano-hydroxyapatite
142
148
EN
Farahnaz
Sharafeddin
0000-0003-2547-079X
Dept. of Operative Dentistry, Biomaterials Research Center, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
sharafeddinf@yahoo.com
Marzie
Moradian
0000-0002-0635-0023
Postgraduate Student, Dept. of Operative Dentistry, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
marziemoradian@yahoo.com
Mehran
Motamedi
Dept. of Operative Dentistry, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran.
Statement of the Problem: The adhesion of resin-modified glass-ionomer (RMGI) to composite resin has a very important role in the durability of sandwich restorations. Hydroxyapatite is an excellent candidate as a filler material for improving the mechanical properties of glass ionomer cement.Purpose: The aim of this study was to assess the effect of adding micro- and nano-hydroxyapatite (HA) powder to RMGI on the shear bond strength (SBS) of nanofilled and silorane-based composite resins bonded to RMGI containing micro- and nano-HA.Materials and Method: Sixty cylindrical acrylic blocks containing a hole of 5.5×2.5 mm (diameter × height) were prepared and randomly divided into 6 groups as Group 1 with RMGI (Fuji II LC) plus Adper Single Bond/Z350 composite resin (5.5×3.5 mm diameter × height); Group 2 with RMGI containing 25 wt% of micro-HA plus Adper Single Bond/Z350 composite resin; Group3 with RMGI containing 25 wt% of nano-HA plus Adper Single Bond/Z350 composite resin; Group 4 with RMGI plus P90 System Adhesive/P90 Filtek composite resin (5.5×3.5 mm diameter × height); Group 5 with RMGI containing 25 wt% of micro-HA plus P90 System Adhesive/P90Filtek composite resin; and Group 6 with RMGI containing 25 wt% of nano-HA plus P90 System Adhesive/P90 Filtek composite resin. The specimens were stored in water (37° C, 1 week) and subjected to 1000 thermal cycles (5°C/55°C). SBS test was performed by using a universal testing machine at a crosshead speed of 1 mm/min. Data were analyzed by two-way ANOVA and Tukey test (p< 0.05).Results: There were significant differences between groups 1 and 4 (RMGI groups, p= 0.025), and groups 3 and 6 (RMGI+ nano-HA groups, p= 0.012). However, among Z350 and P90 specimens, no statistically significant difference was detected in the SBS values (p= 0.19, p= 0.083, respectively).Conclusion: RMGI containing HA can improve the bond strength to methacrylate-based in comparison to silorane-based composite resins. Meanwhile, RMGI without HA has the best bond strength to silorane-based composite resins. Keywords ● Bond Strength ● Composite Resin ● Glass-ionomer Cement ● Hydroxyapatite
https://dentjods.sums.ac.ir/article_41700.html
https://dentjods.sums.ac.ir/article_41700_c7ca4d73271e3e3e75728598437dc13b.pdf
Shiraz University of Medical Sciences
Journal of Dentistry
2345-6485
2345-6418
17
2
2016
06
01
The Efficacy of Green Tea Chewing Gum on Gingival Inflammation
149
154
EN
Parichehr
Behfarnia
0000-0001-7275-6040
Dental Implant Research Center and Dept. of Periodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
behfarnia@dnt.mui.ac.ir
Abolfazl
Aslani
0000-0002-3290-6806
Dept. of Pharmaceutics, School of Pharmacy and Novel Drug Delivery Systems Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
aslani@pharm.mui.ac.ir
Foroogh
Jamshidian
Professional Doctorate, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
jamshidian86@gmail.com
Soheil
Noohi
Postgraduate Student, Dept. of Periodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
soheilnoohi58@gmail.com
Statement of the Problem: According to previous studies, the components of green tea extracts can inhibit the growth of a wide range of gram-pos-itive and -negative bacterial species and might be useful in controlling oral infections.Purpose: The aim of this study was to determine the effect of green tea chewing gum on the rate of plaque and gingival inflammation in subjects with gingivitis.Materials and Method: In this double-blind randomize controlled clinical trial, 45 patients with generalized marginal gingivitis were selected and divided into two groups of green tea (23) and placebo (22) chewing gum. The patients chewed two gums for 15 minutes daily for three weeks. Sulcus bleeding index (SBI) and approximal plaque index (API) were studied at the baseline, 7 and 21 days later. Saliva sampling was conducted before and after 21 days for evaluation of IL-1β. The results were analyzed and compared by using repeated measures ANOVA, paired t test, and independent two-sample t test (α=0.05).Result: The results showed that chewing gum significantly affected the SBI and API (p< 0.001). Paired t test showed that the two groups were significantly different regarding the mean changes of SBI and API at different periods of 1-7, 1-21, and 7-21 (p< 0.001). Concerning IL-1β, the repeated measures ANOVA revealed that the effect of chewing gum was significant (p<0.001). Moreover, paired t-test represented no significant difference between the mean changes of IL-1β within 1-21 day (p= 0.086).Conclusion: The green tea chewing gum improved the SBI and API and effectively reduced the level of IL-1β.Keywords ● Green Tea ● Gingivitis ● Plaque Index
https://dentjods.sums.ac.ir/article_41701.html
https://dentjods.sums.ac.ir/article_41701_04d166dc77b9cd564ffd8d0eb1920573.pdf
Shiraz University of Medical Sciences
Journal of Dentistry
2345-6485
2345-6418
17
2
2016
06
01
Extramedullary Plasmacytoma of the Oral Cavity in a Young Man: a Case Report
155
158
EN
Narges
Gholizadeh
Dept. of Oral Medicine, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran.
n.gholizadeh88@gmail.com
Masoumeh
Mehdipour
Dept. of Oral Medicine, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
mehdipourf@gmail.com
Bita
Rohani
Dept. of Oral Medicine, School of Dentistry, AJA University of Medical Sciences, Tehran, Iran.
rohani_bita@ajaums.ac.ir
Vahid
Esmaeili
Dept. of Oral and Maxillofacial Pathology, School of Dentistry, AJA University of Medical Sciences, Tehran, Iran.
Extramedullary plasmacytomas are rare solitary soft tissue tumors that arise from proliferations of malignant transformed monoclonal plasma cells and can be diagnosed through biopsy and histopathologic examination. These lesions are closely associated with multiple myelomas, which should be ruled out in all these cases by necessary laboratory and radiographic examinations. A 25-year-old man was referred to our clinic with a rapidly-growing painless lesion measuring about 2.5×3×3 cm in the palatal side of the left maxillary second and third molar teeth. A diagnosis of solitary plasmacytoma was made on the basis of clinical, radiographic, and histopathological findings. Early diagnosis of extramedullary plasmacytomas is of great importance. Radiotherapy is the common modality of treatment with or without adjuvant chemotherapy. Progression to multiple myeloma is possible; thus, close follow-up of the patient is essential after completion of the therapeutic procedure. Keywords ● Extramedullary Plasmacytoma ● Multiple Myeloma ● Oral Cavity
https://dentjods.sums.ac.ir/article_41691.html
https://dentjods.sums.ac.ir/article_41691_c8c6f7c2318d77c9becf646747dad7d4.pdf
Shiraz University of Medical Sciences
Journal of Dentistry
2345-6485
2345-6418
17
2
2016
06
01
Clinical, Radiographic, and Histologic Evaluation of Regional Odontodysplasia: a Case Report with 5-year Follow-up
159
163
EN
Fatemeh
Jahanimoghadam
0000-0003-0990-5386
Oral & Dental Research Center, Dept. of Pediatric Dentistry, School of Dentistry, Kerman University of Medical Sciences, Kerman, Iran.
fatemehjahani4@gmail.com
Lida
Pishbin
Oral & Dental Research Center, Dept. of Pediatric Dentistry, School of Dentistry, Kerman University of Medical Sciences, Kerman, Iran.
lida637@gmail.com
Maryam
Rad
Oral & Dental Research Center, Dept. of Oral Medicine , School of Dentistry, Kerman University of Medical Sciences, Kerman, Iran.
rad_1152@yahoo.com
Regional odontodysplasia is a developmental anomaly that affects the primary and permanent dentitions. This disorder is generally localized in only one arch and its etiology is still unknown. Clinically, the affected teeth have an abnormal morphology and are typically discolored. Radiographically, these teeth show a ghost-like appearance. This paper reported the results of radiographic, histologic and laboratory findings about the case of a 5-year-old girl presenting this rare anomaly. Her familial history was negative for any genetic anomaly, regional odontodysplasia or other dental anomalies. The patient’s general health was good and no congenital or acquired disease was reported. She was kept under follow-up care until she reached the age of 10 years. Panoramic radiograph showed the involvement of permanent teeth on the right maxillary quadrant. The affected edentulous quadrant was rehabilitated with temporary acrylic maxillary partial denture. The presentation of this case would hopefully have valuable information for pediatric dentists to review the clinical and radiographic features of regional odontodysplasia, yet expediting the diagnosis and treatment of patients with this condition. Keywords ● Regional Odontodysplasia ● Ghost Teeth ● Dental Dysplasia
https://dentjods.sums.ac.ir/article_41693.html
https://dentjods.sums.ac.ir/article_41693_5726a78e2a9d87440eede7be66f5d4dd.pdf