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Articles by J. Ghanbarzadeh
Total Records ( 4 ) for J. Ghanbarzadeh
  J. Ghanbarzadeh and M.R. Sabooni
  The aim of this study was comparing retention of cast post luted with two kinds of glass ionomer cement in different time intervals. In this in vitro experimental study 60 newly extracted maxillary canine teeth were chosen, the canals were prepared by step-back method and were filled with gutta percha and ZOE sealer. A 12 mm post space was prepared and the posts were made by conventional method using Duralay resin and cast with Supercast alloy. The teeth were divided into 6 random groups, 3 groups were cemented using Ariamix cement and the othacer 3 groups using GC Fuji 1 glass ionomer cement. The tension test was performed on each group, 20 min, 1 and 24 h after cementation and Instron machine was used for applying tension. Results were analyzed by two-way ANOVA and Tukey tests. The results revealed the fact that the tensile strength had a significant statistical difference between the 20 min, 1 and 24 h time intervals (p<0.001). There was no significant difference between two cements between time intervals. The best time interval was 24 h. This study revealed the fact that there was no significant difference between the retention of GC Fuji 1 cement and the Ariamix cement.
  M.R. Nakhaei , J. Ghanbarzadeh and R. Goharian
  The purpose of this study was evaluation of the influence of recasting base metal alloys on internal and vertical marginal adaptation of the casting crowns. Sixty crowns with identical thickness have been made out of wax over 60 metallic models. Wax copings were randomly divided into 3 groups of 20. Group A contained 100% new alloys, group B included 50 new-alloys and 50% once recast alloys and group C comprised 100% once recast alloys. Each group of 20 objects was randomly separated into 2 groups of 10 specimens. One of the groups was casted with Supercast base metal alloys and the other was casted with Verabond base metal alloy. Having placed and cemented the caps, the vertical distance of restoration margins to die`s finishing line was measured and recorded in four points of buccal, lingual, mesial and distal using a stereo-microscope with detection of one micron. Then the dies were cut buccolingually and the internal distance between the margin and die was measured in buccal and lingual. The data were statically analyzed using one-way ANOVA and t-test with the confidence internal of 95%. Meaningful differences were not detected among the three groups in terms of average internal and vertical gaps in Supercast and Verabond alloys. There was no discrepancy in internal and vertical gap between Supercast and Verabond using various percentages of alloys. According to the result of this study on using the three various Supercast and Verabond alloys (100 new alloys, 50 new-alloys and 50% once recast alloys and 100% once recast alloys), regarding the internal and vertical gap indicators no difference was noticed.
  J. Ghanbarzadeh , M.R. Sabooni and N. Amiri Tehrani
  The aim of this study was to evaluate the effect of repeated firings on the color stability of Vita VMK95 and Ivoclar IPS classic metal ceramic porcelain systems using a colorimetric. In this experimental in vitro study, 24 disc-shaped specimens, 10 mm in diameter with a 0.3 mm base metal alloy (Supercast) thickness were prepared and two types of porcelains, a 0.2 mm opaque and a one millimeter dentine porcelain (Shade A3) thickness, were applied on them. Samples were fired one, three and six times. Color measurement was carried out after each firing using a colorimeter (Minolta, CR-10) and data were expressed in Commission Internationale I`Eclairage (CIE-LAB) system coordinates. In this study, the parametric paired t-test was used to analyze the data. After six times of firing the l*, a* and b* parameters were significantly different, before and after aging, for Vita VMK95 (respectively p = 0.043, p = 0.002, p<0.001); however for Ivoclar IPS classic, only a* parameter was significant difference before and after aging (p<0.001). After repeated firing, color stability of Ivoclar IPS classic was better than Vita VMK95 porcelain.
  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.
 
 
 
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