فهرست مطالب

Journal of Dental Research, Dental Clinics, Dental Prospects
Volume:8 Issue: 1, Winter 2014

  • تاریخ انتشار: 1392/11/12
  • تعداد عناوین: 10
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  • Farnaz Falaki, Amir Hossein Nejat, Zohreh Dalirsani Page 1
    Background And Aims
    The effect of low intensity laser radiation in the treatment of acute and chronic pain has been the subject of many studies and is now established. Trigeminal neuralgia is a pain passes through nerve’s branches and its trigger is located in skin or mucosa that could lead to pain with a trigger stimulus. The pain involved branches of trigeminal nerve that sometimes has patients to seek the treatment for several years. Nowadays different treatments are used for relief of pain that most of them cause tolerance and various side effects.
    Methods
    This paper reviews and summarizes scientific papers available in English literature published in Pubmed, Scopus, Science Direct, Inter science, and Iran Medex from 1986 until July 2011 about the effect of these types of lasers on trigeminal neuralgia which is one of the most painful afflictions known. In different studies, the effect of laser therapy has been compared with placebo irradiation or medicinal and surgical treatment modalities.
    Results
    Low level laser therapy (LLLT) is a treatment strategy which uses a single wavelength light source. Laser radiation and monochromatic light may alter cell and tissue function. However, in most of studies laser therapy was associated with significant reduction in the intensity and frequency of pain compared with other treatment strategies, a few studies revealed that between laser and placebo group there was not any significant difference according to the analgesic effect.
    Conclusion
    Low level laser therapy could be considered in treatment of trigeminal neuralgia without any side effects.
  • Hamed Mortazavi, Maryam Baharvand, Masoumeh Mehdipour Page 6
    Cancer of the oral cavity accounts for approximately 3% of all malignancies and found in 270.000 patients annually worldwide. Oral cancer is the 12th most common cancer in women and the 6th in men. Many oral squamous cell carcinomas develop from potentially malignant disorders (PMDs). Lack of awareness about signs and symptoms of oral PMDs among general population and even healthcare providers are believed to be responsible for the diagnostic delay in identification of these entities. The aim of this article was to update and improve the knowledge of healthcare providers about oral PMDs.
  • A large Multifocal Aggressive Osteoblastoma of Mandible: an Immunohistochemistry case study report
    Vinuth Dp, Poonam Agarwal, Dilip Gadewar, Gunjan Dube Page 9
    Aggressive osteoblastoma (AO) is a benign, osteoblastic tumour which is rare in head and neck region. Clinical and histological features are so admixed with other benign and low grade malignant tumours. The aim of this article is to report and discuss the differential diagnosis of aggressive osteoblastoma of mandible. A 25 -year-old male patient reported with pain and asymmetry on the left side of the face since 8 months. Radiographic evaluation showed a mixed lesion extending from approximately lower left premolar to third molar region. After incisional biopsy, resection with continuity defect was done. Microscopic findings showed woven bone and bony trabeculae with varied degree of mineralization along with sheets of osteoblast cells. Immunohistochemistry showed p53 and cytokeratin (CK) was negative, ki-67 index was 7%. Postoperative follow-up of 15 months showed no evidence of recurrence.
  • Zohreh Jaafari, Ashkavandi, Mohammad, Javad Ashraf, Aman, Allah Akbari Page 15
    Background And Aims
    Mast cells are one of the characteristic factors in angiogenesis, growth, and metastatic spread of tumors. The distribution and significance of mast cells in many tumors have been demonstrated. However, few studies evaluated mast cell infiltration in salivary gland tumors. In this study, we have examined mast cell count in benign and malignant salivary gland tumors.
    Materials And Methods
    A descriptive and cross-sectional study was enrolled on 30 cases of pleomorphic adenoma, 13 cases of adenoid cystic carcinoma, 7 cases of mucoepidermoid carcinoma (diagnosed on the basis of 2005 WHO classification), with adequate stroma in peritumoral and intratumoral areas, and 10 cases of normal salivary glands. The samples were stained with 5% diluted Giemsa solution and the average of stained cells was calculated in 10 random microscopic fields in peri- and intratumoral areas. These data has been analyzed by T-Test, Mann- Whitney and Krusskal- Wallis tests.
    Results
    The average of mast cell count increased in the tumors rather than normal salivary glands. There was no significant difference between benign and malignant tumors, also between different malignant tumors. Infiltration was significantly more in peritumoral stroma in both tumoral groups (PV=0.001). Minor salivary glands contained significantly greater number of mast cells.
    Conclusions
    Although mast cell count increased in benign and malignant salivary gland tumors, but there was not any significant difference between the tumoral groups. We suggested further studies to determine the type of these cells which might be helpful in assessment of biological nature of the tumor and its future treatment modality.
  • Mohammad Javad Moghaddas, Horieh Moosavi, Marjaneh Ghavamnasiri Page 21
    Background And Aims
    This in vitro study evaluated the elapsed time of composite restoration following root canal irrigation with Sodium hypochlorite (NaOCl) on sealing ability of total-etch and self-etch adhesive systems.
    Materials And Methods
    The roof of the pulp chambers and roots (1-2 mm below furcation) of forty human first molar teeth were cut and pulp tissues completely removed. Teeth were randomly divided into two main groups (n=20). Group E (experimental) was irrigated with 5% NaOCl and group C (Control) was left untreated. For the experimental group, after obtruding of root canals with gutta-percha and sealing the cavity with Cavit, the specimens were kept in artificial saliva for two weeks. Then each group was divided into two subgroups according to the total etch or self etch adhesives application; Scotchbond Multi-Purpose and Clearfil SE Bond. The specimens were restored by resin composite associated with each bonding agent; «Z250 and Clearfil Photo core, respectively». Fluid filtration method was used for evaluation of microleakage. Data was statistically analyzed using two-way ANOVA (α =. 05).
    Results
    Two types of dentin adhesive systems showed no statistically significant difference regarding microleakage (P=. 77). NaOCl treated groups demonstrated significantly higher microleakage values than that of the NaOCl untreated groups (P=. 001). The interaction between two factors was not significant (P=0. 78).
    Conclusion
    Waiting two weeks after cavity irrigation with Sodium Hypochlorite did not eliminate microleakage of resin composite restorations.
  • Mahdjoube Goldani Moghadam, Sogra Yassaei, Reza Fekrazad, Neda Shahraki Page 27
    Background And Aims
    The aim of this study was to compare shear bond strength (SBS) of metal and ceramic brackets bonded to enamel using acid versus Er: YAG laser etching.
    Materials And Methods
    Eighty premolars were divided into 4 groups: AM (acid etching/ metal brackets), AC (acid etching/ ceramic brackets), LM (laser etching/ metal brackets) and LC (laser etching/ ceramic brackets). Enamel conditioning was done using acid in AC and AM and Er: YAG laser in LC and LM.Brackets were debonded with a Dartec machine and the SBSs were determined. Adhesive remnant index was evaluated under a stereomicroscope. Two additional teeth were conditioned with acid and laser for scanning electron microscopy examination. Comparisons of SBS value were done by ANOVA test. Chi- square was used to determine differences in ARI scores.
    Results
    statistical analyses showed that SBSs of acid groups were significantly higher than that of laser groups, but differences between SBS values of AC/ AM and LC/LM were not significant. SEM examination revealed different etching pattern.
    Conclusion
    Low power Er: YAG laser etching offers clinically acceptable SBS which besides its other superiorities to acid etching can be an appropriate alternative for bonding of ceramic brackets.
  • Atena Shirzad, Mahdi Pouramir, Maryam Seyedmajidi, Niloofar Jenabian, Ali Bijani, Mina Motallebnejad Page 35
    Background And Aims
    Oral lichen planus is a common chronic inflammatory disease in oral mucosa with malignant potential, pathogenesis of which is not still well known. Free radicals and reactive oxygen species can play an important role in the pathogenesis of oral lichen planus. The aim of this study was investigation of salivary oxidative stress and antioxidant systems patients with oral lichen planus.
    Materials And Methods
    In this case-control study, 30 patients with oral lichen planus(case group) and 30 age- and gender-matched healthy subjects(control group) that referred to dental school of Babol University of Medical Sciences, were selected using simple sampling method. Unstimulated saliva of two groups was collected. Salivary total antioxidant capacity (TAC) and lipid peroxidation products were investigated and compared using ferric reducing antioxidant power (FRAP) and thiobarbituric acid reactive substance (TBARS) methods respectively. The data were analysed using T-student test.
    Results
    The mean and standard deviation of salivary TAC in patients with oral lichen planus (297.23±149.72μM) was significantly lower than the controls (791.43±183.95μM) (P)
  • Behnaz Esmaeili, Hengameh Safarcherati, Assila Vaezi Page 40
    Background And Aim
    Today light cured composites are widely used. Physical and mechanical properties of composites are related to degree of conversion. Light curing unit is an important factor for composite polymerization. Aim of this study is evaluation of composite hardness using halogen and LED light curing units.
    Materials And Methods
    In this invitro study, 30 samples of Filtek Z250 and C-Fill composite resin were provided. Samples were light cured with Ultralume 2, Valo and Astralis 7. Vickers hardness number (VHN) was measured in 0, 1, 2 mm depth. Statistical analysis used: Data analysed by SPSS software and compared with each other by T-test, one-way and two-way ANOVA and Post-hoc Tukey test.
    Results
    In Filtek Z250, at all surfaces, VHN of Ultralume 2 was higher than VHN of Valo and Astralis 7. In C-Fill composite, in depth of 0, 1 mm, light curing devices showed different results but in depth of 2 mm, performance of all devices was rather similar.
    Conclusions
    Before using new brands of composites, it is better to investigate their characteristics by light curing devices.
  • Houmayon Alaghemand, Faezeh Abolghasemzade, Farzaneh Pakdel, Reza Judi Chelan Page 45
    Background And Aims
    microleakage is still one of the major problems of composite based restorations. This study compared the microleakage and thickness of resin cement in ceramic inlays with various temperatures.
    Materials And Methods
    Class V cavities were prepared in the buccal and lingual side of thirty human molars with occlusal margin in enamel and gingival margin in dentin (3mm width, 5mm length and 2mm depth). laboratory-made inlays (LMI) used for buccal cavities, and CAD/CAM made inlays (CMI) used for lingual cavities. All cavities were divided into six groups (n=10): 1: LMI in -5.c 2: LMI in 50. c 3: LMI in room temperature (25.c) 4: CMI in -5.c 5: CMI in 50. c 6: CMI in room temperature (25.c) Inlays bonded to cavities in the pulp pressure and temperature simulator device. After thermocycling and dye penetration, teeth divided in two mesiodistally halves. Amount of dye penetration and film thickness was measured by stereomicroscope and analyzed with kruskal-wallis, wilcoxon and spearman correlation tests.(ɑ= 0.05)
    Results
    There was no statistically significant difference between leakages in the different inlay temperatures (P value˃0.05). The mean cement thickness in of laboratory made inlays(gingival margin (83.7±11),occlusal margin (84.7±19))was greater than the CAD/CAM inlays(gingival margin(69±16), occlusal margin (84.7±16)). No correlation was found between cement thickness and microleakage either in enamel or dentin for any of the ceramic systems.
    Conclusions
    The different temperature of inlays had no effect on microleakage. CAD/CAM inlays had lesser cement thickness than laboratory made inlays, but this was not related to their microleakage.
    Keywords: microleakage, film thickness, ceramic, CAD, CAM
  • Giselle Rodrigues De Santanna Page 56
    Conservation of deciduous teeth with pulp alterations caused by caries or trauma is a major therapeutic challenge in Pediatric Dentistry. It is essential that the sanitizers used in root canal procedures perform well in eliminating bacteria. Antimicrobial photodynamic therapy (PDT) is an emerging and promising adjuvant therapy for endodontic treatment in an attempt to eliminate the microorganisms persistent to chemo-mechanical preparation. This paper reports the case of a five-year-old male with type I diabetes mellitus, presenting the need for pulp therapy in maxillary primary left central incisor due to injury. The proposed treatment included the use of PDT for decontamination of the root canals with the application of 50 µg/ml methylene blue dye for 3-5 minutes and 40 J/cm2 as energy density, taking into account the need for tissue penetration and effectiveness of PDT inside the dentinal tubules.