Background and Aims: Disc displacement is the most common temporomandibular joint disorder and MAGNETIC resonance imaging (MRI) is the gold standard in its diagnosis. This disorder can lead to changes in signal intensity of MAGNETIC resonance (MR). The purpose of this study was evaluation of correlation between relative signal intensity of MR images of retrodiscal tissue, superior and inferior head of lateral ptrygoid muscle with type of anterior disk displacement and condylar head flattening in patients with temporomandibular disorder (TMD).Materials and Methods: In this retrospective study, 31 MR images of patients who had anterior disc displacement were evaluated. After relative signal intensity measurement for retrodiscal tissue, superior and inferior head of lateral ptrygoid muscle, the correlation between relative signal intensity and type of anterior disc displacement was evaluated with repeated measure ANOVA test. In each of these 3 areas, t-test was used to compare the groups with and without condylar head flattening.Results: The correlation between relative signal intensity of MR images and type of anterior disc displacement in retrodiscal tissue, superior and inferior head of lateral ptrygoid muscle was not significant. There was also no statistically significant correlation between relative signal intensity of MR images and flattening of condylar head in retrodiscal tissue, superior and inferior head of lateral ptrygoid muscle (P>0.05).Conclusion: According to findings of this study, relative signal intensity of MR images in retrodiscal tissue, superior and inferior head of ptrygoid muscle is not a good predictor for type of anterior disc displacement and flattening of condylar head. It seems that this cannot be used as a diagnostic marker for TMD progression.

BACKGROUND AND OBJECTIVE: The congenital anomaly of nose is the one of causes of cosmetic of face and repair of this defect is very difficult. In this article, it was reported a case of congenital hypo plastic nasal alar with failure in operation two times. CASE: A 19 year old female referred with hypo plastic nasal alar who had been already operated two times with a failure in repairing this defect. A COMPOSITE graft from ear with suitable size was inserted in the defect area of nose and it was improved. CONCLUSION: For repairing this anatomical defect and decreasing failure, this new surgical method is suggested.

In this study, alumina-iron COMPOSITEs have been prepared by slip casting in order to provide gradient iron in alumina.5 wt.% of iron was used under the MAGNETIC fields by the magnitude of 0.8 and 0.08T. Two dispersants were examined as the dispersing agent using 70, 75 and 80 wt.% of solid loading in slips. Samples were sintered in a microwave oven at the temperature of 1350˚C and 1450˚C for 30 minutes, at 1500oC for 1 minute, and in a conventional tube oven at the temperature of 1485˚C for 2 hours using argon gas. The apparent and optical microscope pictures of green and sintered samples revealed that using PCN and 70 wt.% of solid loading under the mild MAGNETIC field results in the best sample regard as density (3.7 g/cm3), strength (82.7 MPa) and iron gradient.

Hypothesis: In recent years, much attention has been paid to the use of BaFe12O19 barium ferrite MAGNETIC material in the manufacture of polymer COMPOSITE magnets. Hence, nitrile butadiene rubber-polyvinyl chloride (NBRPVC) polymer COMPOSITE magnets containing barium ferrite alloy powder BaFe12O19 with particles less than 5 microns were made with optimal properties Methods: The effect of different amounts of barium ferrite MAGNETIC powder in the polymer subs trate on the MAGNETIC, morphological and mechanical properties of barium ferrite polymer magnets was inves tigated using SEM images and VSM diagrams and tensile tes t. Results: NBR-PVC/ BaFe12O19 COMPOSITE magnets containing 70 %wt NBR and 30 %wt PVC with 100 units of base rubber (phr) including 2 units of sulfur as baking agent, 4 units of zinc oxide as activator, 3 units of s tearic acid as lubricant, 2 units of tetramethyl thioram disulfide (TMTD) and 2 units of mercapto-benzythiazyl disulfide (MBTS) as accelerator and barium ferrite powder BaFe12O19 were fabricated with a particle size of less than 5 microns and a combination of different percentages as a MAGNETIC agent. Among the samples made, N-P/F80 COMPOSITE magnets with a ratio of 20: 80 (powder: polymer) had the highes t saturation magnetism of Ms and the residual magnetization of Mr and the lowes t intrinsic coercivity of Hc. As expected, the bes t sample in terms of tensile s trength was N-P/F20 with a powder: polymer ratio of 80: 20, and finally, according to all the results related to the MAGNETIC, morphological and mechanical properties of the samples, the mos t suitable one in terms of good particle dispersion in the polymer subs trate and suitable tensile s trength and appropriate MAGNETIC properties of N-P/F50 with 50: 50 (powder: polymer) ratio was selected.