RESUMO
Cell-titanium interactions are crucial to the clinical success of bone and dental implants. Mechanical or chemical surface treatment can help the cell attachment to implant surface. The purpose of this study was to investigate the effect of two distinct surface treatments [sandblasted and acid-etched] on fibroblasts cell attachment and viability. In this experimental study the fibroblasts behavior was analyzed on three different titanium surfaces: sand blasted [SB], Acid-Etched [AE] and pure commercial titanium [PCT], in three groups, [N=10]. Scanning electron microscopy [SEM] showed distinct micro topographies. Cell morphology and initial attachment were evaluated by SEM. Cell viability was measured by means of a 3- [4, 5-dimethylthiazol-2-yl] -2, 5-diphenyltetrazolium bromide [MTT] assay. The number of viable cell counts were compared using one way ANOVA and post hoc Tukey Test. SEM observation revealed drastic differences in surface micro topography, with a higher cell density on [SB] than [AE] and [PCT]. Cell attachments were much better in the sand-blasted group than others. Cell viability recorded by the sand-blasted group [1.28 +/- 0.58] was significantly better than acid-etched [0.95 +/- 0.23] and pure commercial titanium [1.16 +/- 0.17]. [P<.05] Implant surface treatments influence the attachment and viability of fibroblasts [L-929], and sand-blasted treatment seems to be the most favorable surface to compare with acid-etched and pure commercial titanium surface
RESUMO
Data on home accidents for a 3-year period [2000-2002] were collected from health houses, health centres and hospitals involved in a home accident prevention programme in Shiraz, Islamic Republic of Iran. A total of 15 402 accidents were registered, with a mortality rate of 1.3%. Accidents were more common in women than in men [52.1% versus 47.9%] and urban than rural areas [66.3% versus 33.7%]. Burns [66.5%], followed by injuries due to sharp objects [11.3%] were the most common causes. Accidents were more prevalent in children aged under 5 years, followed by 5-9 and 15-19 years of age