[ invitro study into the effect of two denture cleaners on surface roughness of acrylic dentures]

Utilization of denture cleaning solutions and toothpastes are common methods of cleaning the denture surfaces, which can increase the surface roughness of acrylic dentures. The aim of this study was to evaluate the effect of two cleaning agents in the form of solution and paste on the surface roughness value of denture following tooth brush application. Thirty acrylic discs with 20 mm diameter and 2 mm thickness were made and uniformly polished. These disc were randomly divided into three groups, each comprising ten discs. The roughness value [Ra] was measured, using talysurf. 10. The discs in the first group were brushed using tooth paste and brush. The discs in the second group were first brushed using water and tooth brush, and then immersed in cleaning solution for 92 hours, tooth brushing abrasion test was performed with 200 gr weight applied. The surface roughness of each specimen after 10.000 strokes was determined. Data were analyzed with ANOVA and post hoc Tukey test [alpha = 0.05]. An increase in the surface roughness was observed for all groups. However, surface roughness in the first group, for which tooth paste had been used was significantly increased as compared to the other groups [p = 0.01]. But there was no significant difference between the other two groups [p > 0.05]. Denture cleaning materials in the form of solution produce less surface roughness as compared to the ones in the form of pastes

[Neonatal survival rate and its related causes in NICU of private and governmental hospitals in Sari by survival analysis technique during 2005-2007]

Many children younger than 1 year old [about 4/000/000] are dying annually around the world, that three quarters of this mortality is related to neonatal period [4 weeks after birth]. Several factors such as environmental conditions, social and genetic factors are causes of decreasing neonatal mortality. The aim of this study was to determine the neonatal survival rate and its related causes in NICU of private and governmental hospitals in Sari. This survival analysis was a descriptive study of 500 neonates who were admitted into NICU of private and governmental hospitals [Booali Sina, Nimeyeh Shaban, Amir-Mazandarani, and Shafa Hospitals] in Sari during 2005 to 2007. Data was gathered by using Self-making Informational Form [validity and availability was confirmed by content validity and alpha- kronbach]. Information were obtained by interview with mothers, study of patient's chart, observation of the neonates, or phone interviews, after being discharged from the hospital. Statistical analysis of data was done by using Kaplan-Mayer survival analysis technique, and survival tables. Furthermore, risk factors were determined by logistic regression. Three-hundred twenty six neonates [65.2%] were the first rank of birth. Sixty-three mothers [12.6%] experienced previous neonatal mortality. 217 of mothers [43.4%] were illiterate and 85 [17%] had diplomas or higher education. 119 neonates [23.85] died within 28 days of life. There was a relationship between higher education level of mothers, polyhydraminous [over production of amniotic fluid according to sonography report], and delivery method, neonatal weight at birth, congenital anomalies, and neonatal survival rate. Eighty-seven expired neonates [73.1%] had birth weight lower than 2500gr, and 21 [16.8%] had gestational age lower than 36 weeks. The survival rate was higher among neonates within 21 and 22 days of life. The mortality rate among neonates with 2 to 3 days of life was higher than the other age group. We have not achieved adequate success in comparison with other developed countries in the improvement of neonatal survival rate during low gestational age. On the other hand, the physical and cognitive abilities of neonates were not evaluated in this study. We recommend further studies with more samples for assessment regarding survival rate of the neonates without disability