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Articles by N. Asadzadeh
Total Records ( 5 ) for N. Asadzadeh
  N. Asadzadeh , A.S. Madani , A. Mirmortazavi , M.R. Sabooni and V. Shibani
  The aim of this clinical study was to examine the mandibular flexure in two transverse and longitudinal dimensions of female dental students. Thirty-five fully-dentate female dental students were selected for the study. Intermolar, intercanine and canine to second molar distance in the most open position and occlusion were measured using the Mitutoyo digital calipers. Lower arch width and length change were calculated and proposed as the mandibular flexure. Data were analyzed using one-way ANOVA and paired t-test. The mean reduction of intermolar and intercanine distance at maximum open and closed mouth positions was 0.19 and 0.17 mm, respectively. The mean longitudinal dimensional change of right and left side of the mandible was 0.05 and 0.15 mm, respectively. No significant differences was seen (p = 0.76). It is concluded that mandibular arch width in the posterior and anterior regions decreases at the most open position compared to rest position. Also, Increasing in longitudinal dimension of the lower arch between canine and second molar in maximum open position was seen.
  N. Asadzadeh , J. Ghanbarzadeh and A.R. Mohajeri
  The aim of this in vitro study was to compare the fracture resistance and failure mode of endodontically treated teeth restored with three different post and core systems before and after load cycling. In this interventional study, forty-two maxillary incisors selected. After root treatment, they were randomly divided into six groups of 7. In group 1 and 2, casting post and core was used. In group 3 and 4, Dentatus-posts and composite cores were used and in group 5 and 6, FRC posts were used. Cyclic loading was performed in group 2, 4 and 6. There after compressive load was applied at a 45° angle to the long axis of the tooth at a crosshead speed of 1 mm min-1 until the fracture occurred. One-way ANOVA and Tukey-Karmer test were used to determine the difference of the failure loads between the groups. The load cycling had no statistically significant effect on fracture strength among groups. Teeth restored with cast posts-and-cores exhibited significantly higher resistance to fracture than para post group (p<0.05). In cast post and core group and para post group, fracture mainly occurred in the root and it was unrestorable but in FRC post and composite group, it mainly occurred in the composite cores. Fracture resistance of teeth restored with cast post and core, dentatus post and FRC pose were not affected by load cycling. The created fractures in casting post and core and dentatus post were undesirable and in root, which made the restoration of the teeth impossible.
  N. Asadzadeh , M. Seify and R. Heidarian
  The purpose of this study is to compare the fracture strength of anterior teeth through four different methods. In this experimental study 24 central maxillary teeth were used. The crown of them was cut. They were divided into four groups. After preparing a post space, in the first group the FRC post with composite core used and then celluloid crown was used. In the second group, as the first one with this difference the crown was metal. In the third group the dentatus pin with composite core used and the crown was formed by celluloid. In the fourth group the way was as the third one but a metal crown issued. The examples mounted in an acrylic blocks and were pressed in Instron machine, as well the press power was calculated. The results were analyzed with one-way variance and Duncan test. There was no significant relationship between the break points of the four groups (p = 0.44). The most amount of fracture load was for the first group and the lowest place was for the second group. Crown doesn't provide more strength for tooth in this condition.
  A. Javanmard , K. Khaledi , N. Asadzadeh and A.R. Solimanifarjam
  The objective of this study was to assess the association of polymorphism in leptin gene with breeding value of milk traits in Iranian Holstein cattle. Traits analyzed were breeding values of Milk and Fat production. A strategy employing polymerase chain reaction was used to amplify a 422 bp from blood, semen. Digestion of polymerase chain reaction products with Sau3AI revealed two alleles: Allele A was 390, 32 fragment and allele B was 303, 88 and 32 (only 303 fragment visible on the gel). Three patterns were observed frequencies were 0.900, 0.100 and 0.00 for AA, AB and BB, respectively (p≤0.21). The AB bulls were superior for milk fat production, in relation to homozygous AA. The Bovine leptin gene is strong candidates in the dairy cattle QTL search. This polymorphism could be further evaluated for marker assisted selection and the developed PCR methodology would expedite screening for large numbers of animal required for such studies.
  N. Asadzadeh , A. Javanmard and M.R. Nassiry
  Clean, high molecular weight DNA is pre-requisite for DNA markers. The amount and quality of DNA is a crucial point for all further analysis. A unique advantage of these PCR techniques is the rapid DNA analysis of many animal samples using small quantities of DNA. Thus, a simple and rapid DNA extraction method is needed for studies such as genetic analysis that require large populations. Several methods for minimizing the DNA extraction steps have been reported but they require a large amount of animal tissues. In addition, bleeding and management of sampling and storage of the blood sample in freezers is often difficult due to space constraints. To overcome these problems, some techniques developed a DNA extraction method using the milk or hair root or semen. Researchers compared 4 methods of rapid DNA extraction with isolations of mammalian whole blood samples. DNA extraction methods included boiling, salting out, phenol-chloroform and silica gel procedures. Spectrophotometry and gel monitoring evaluated the DNA yield and purity for the 4 methods. The silica gel and phenol-chloroform methods yielded significantly purity and higher concentration of extracted DNA compared with other DNA extraction methods.
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