فهرست مطالب
Dental Clinical and Experimental Journal
Volume:1 Issue: 1, Nov 2015
- تاریخ انتشار: 1395/08/28
- تعداد عناوین: 5
-
Page 1BackgroundPulsed Er:YAG lasers is an effective instrument to drill hard dental tissues. This article evaluates the effect of Er:YAG (2.94 µm) laser on both dentin and enamel hard tissues.ObjectivesThe current study aimed to evaluate the exact depth of ablation and effective ablation area on dental hard tissues, in different conditions and various factors of Er:YAG laser.
Patients andMethodsIn this research, a total of 20 human molar teeth were irradiated by Er:YAG (2.94 µm) laser, after mounting process and sterilization.
Half of them were used as enamel samples and the rest, after removing the enamel tissue from their crowns, were used as dentin samples. The crowns of the samples were regarded as cube with all their lateral sides and were exposed by one special setting of the laser. Laser Irradiation was done in two different frequencies and all the procedure was accompanied by water cooling. The number of 100 pulses was selected as a fixed factor; therefore, 11 holes for all enamel and dentin samples were obtained. The hole images were taken by combining optical and computer methods, and then by processing them in MATLAB software, the depth of ablation and effective ablation area were calculated.ResultsAfter evaluating the exact amounts of ablation depth and effective ablation area and analyzing the data, it was found that increasing energy yields in increasing the depth of ablation, which was the case for both enamel and dentine tissues. It was also found that variations in effective ablation area were insignificant for both tissues. Ablation depth and effective ablation area were more tangible in dentin rather than enamel tissues. Finally, using this laser did not result in blunt and clear borders for the created holes.ConclusionsApplication of the Er:YAG laser for hard tissue removal and cavity preparation, compared to conventional methods, is considered as a more comfortable technique because there isnt any contact between laser beam and teeth. Secondly there is no vibration. However, this procedure is not recommended without water cooling.Keywords: Er:YAG Laser, Ablation Depth, Dentin, Enamel, Cavity Preparation -
Page 2BackgroundTumor-associated tissue eosinophilia (TATE) is reported in different cancers of human body but its exact role is not yet defined in head and neck squamous cell carcinoma (HNSCC).ObjectivesThe current study aimed to assess the relationship between TATE and histopathologic grading, age and gender of patients with HNSCC.Materials And MethodsIn this cross-sectional study, 90 paraffin-embedded blocks of HNSCC samples were sectioned and stained with Sirius red (a histochemical staining). Then the eosinophils were counted in 10 high power fields with magnification of 400x (eosinophil/10HPF). Data were analyzed using Mann-Whitney, Kruskal-Wallis and the Spearman correlation tests by SPSS software version 21.0.ResultsThe mean age of the samples was 60.23 years, 46.67% of the samples were male and 53.33% were female. Histopathologically, 51 cases were grade1 (56.67%), 25 cases were grade 2 (27.78%) and 14 cases were grade 3 (15.55%). The average eosinophil count in all cases was 143.56 ± 135.90 eosinophil/10HPF. There was no significant relationship between TATE and age, gender and histopathologic grading in HNSCC patients.ConclusionsAccording to the obtained results, apparently eosinophils had a poor role in HNSCC progression and there was no obvious relationship between the occurrence of this disease and clinicopathologic factors in patients with HNSCC.Keywords: Eosinophil, Head, Neck Neoplasm, Squamous Cell Carcinoma of Head, Neck
-
Page 3BackgroundBurning Mouth Syndrome (BMS) is a common condition that affects menopausal women and patients experience a severe burning sensation in their mouth. So far there have been no definitive treatment for this disease.ObjectivesThe present study was undertaken to evaluate the efficacy of zinc supplement in improving the symptoms of burning mouth syndrome.
Patients andMethodsSixty patients were enrolled in this study; they were randomly divided to two groups. Patients in the intervention group received replacement therapy twice daily, which continued for three months. In the control group, placebo capsules, which were completely similar to zinc sulfate capsules, were administered two times daily.ResultsBurning sensation severity in the two groups after the intervention was significantly different (P = 0.001).ConclusionsIt can be concluded that zinc supplement might decrease the intensity of burning mouth syndrome in patients with zinc deficiency.Keywords: Zinc, Burning Mouth Syndrome, Pain -
Page 4BackgroundSeveral studies showed that 4% articaine had greater tissue penetration than other anesthetics.ObjectivesThe current study aimed to compare the efficacy of buccal injection of local 4% articaine and 2% lidocaine on the numbness of palatal tissue.Materials And MethodsOne hundred-ninety-six patients were randomly divided into two groups of 100. A group received 4% articaine and the other group received just 2% lidocaine buccal injection. The examination of palatal tissue numbness was conducted by decole and luxation of palatal tissue. Pain assessment was conducted by verbal response scale (VRS).ResultsThe Chi-square test showed a significant relationship between the type of anesthesia and pain (PConclusionsAlthough 4% articaine can cause more anesthesia of palatal tissue compared to 2% lidocaine, its routine use is not recommended due to its incomplete success.Keywords: Infiltrated Buccal Injection, Palatal Tissue Anesthesia, Articaine