Comparison of local and imported osteosynthetic mandibular bone plates in terms of micro hardness in modified simulated body fluid at periodic intervals

To determine the micro hardness of novel Pakistani manufactured osteosynthetic titanium bone mini plates [MPP] and imported osteosynthetic titanium bone mini plates [MPG] in body like conditions. Descriptive study. This study was carried out at School of Chemical and Material Engineering, NUST from March to May 2013. Microvicker hardness tester was used for assessment of micro hardness of two types of plates. The hardness was checked before conditioning and after conditioning at [six different places] on interval of 1, 7, 14, 21, 28 and 40 days in modified simulated body fluid with ph 7.4 and temperature 37[degree]C. Result showed that hardness of MPG was higher than MPP and after conditioning in simulated body fluid at all time periods, hardness of both types of plates was increased. It can be concluded from this study that micro hardness of imported plates is more than local plates so recommendations should be sent to manufacturers of local industry of Pakistan to improve the hardness of local plates so that they can meet international standards

comparative analysis of bleached and sound enamel structure through scanning electron microscopy and atomic force microscopy

To analyze the effects of bleaching agent on enamel structure and to characterize the morphological and chemical changes in enamel due to bleaching. Experimental study. School of Chemical and Material Engineering [SCME], NUST Islamabad from Feb to May 2013. Ten recently extracted pre molars between the 12-22years age group were randomly assigned into two groups. Group one was a non-bleached control group with sound enamel. Group two was bleachedwith Everbrite In office tooth whitening system after specimen preparation, surface morphology was observed under SEM [scanned electron microscope] and AFM [Atomic force microscope]. Thedetrimental effects of hydrogen per-oxide on enamel were evident in bleached specimens under SEM, and AFM analysis. There were significant surface alterations found in the bleached specimens as compared to control group. However salivary buffering potentials could overcome the demineralizing effect of bleaching gel

Comparison of in-vitro conditioning of two types of mandibular bone plates in modified simulated body fluid characterization with scanning electron microscope and energy dispersive x-ray spectroscopy

Objectives: In this study the conditioning of two mandibular mini plates was done in modified simulated body fluid at 37°C

Study Design:An experimental study

Place and Duration of Study: This study was conducted at in the laboratory of National University of Science and Technology from March to Mach 2013

Materials and Methods: The two brands of mini bone plates were selected, one imported from Germany while other was manufactured in local industry. The modified simulated body fluid [m-SBF] was prepared by dissolving reagent in deionised water. The conditioning was done at 1, 7, 14, 21 and 28 days. The surface changes produced after conditioning were analyzed under scanning electron microscope [SEM]. The energy dispersive X-ray [EDX] analysis was also used to identify compositional variations of the MPP and MPGsurfaces

Results: The SEM revealed almost similar changes in body fluid environment in both plates however the surface of MPG was anodized while no anodization was done on MPPs while in EDX analysis the main elements found were Ti[Titanium] and O [Oxygen] in MPP and MPG. O was more initially then gradually decreases with passage oftime in case of MPG while in MPP the O was in low concentration in early conditioning time and then it decreased

Conclusions: The surface of MPG was anodized while no anodization was done onMPPs