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Articles by M.R. Sabooni
Total Records ( 4 ) for M.R. Sabooni
  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.
  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. Sabooni and J. Ghanbarzadeh
  The aim of this in vitro study was to evaluate the effect of three liquid types including tap water, distilled water and slurry water on surface hardness of type IV gypsum (GC Fuji Rock, Japan). For each studied groups, 10 dies were produced according to the manufacturer’s instructions whereby gypsum powder were mixed with three different liquids. Twenty four hours after producing the dies, hardness measurement test was carried out by way of microvickers and using the set (MATSUZAVA, MHT2, Japan) and penetration time of 5 sec and power of 25 g. The test was carried out on three points of each die’s surface and averages of hardness of dies were measured. The obtained data were evaluated by using of one-way ANOVA test as well as Tukey test using SPSS program. Results showed that the average of surface hardness between the three studied groups, have significant statistical differences with each other (p<0.001). In the range of this study, it was shown that distilled water and slurry water produced the most and the least surface hardness when they mixed with gypsum type IV respectively.
  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.
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