Objective: To compare the success of self-drilling and self-tapping methods in the retraction of maxillary anterior teeth. Material and Methods: The study was conducted in 57 subjects with Cl II malocclusion who needed to be treated with extraction of four maxillary teeth. The selftapping method was used on the left side and the self-drilling method was used on the right side. Then, the pain rate of each method was recorded by the numerical rating scale (NRS). Statistical analysis was done by t-test and Chi-square test. The significance level in this study was considered at p-value<0.05. Results: Considering the clinical mobility as the failure, the success of treatment was equal in both methods and was 93%. The inflammation around the mini-screws was 8.8%. A significant relationship was found between the variables inflammation and success (p<0.05). The mean pain was 2.47, but there was no significant difference between the two methods in terms of pain score (p>0.05). There was a significant difference between the groups (p=0.03). The pain was significantly higher in the female. Conclusion: There is no difference between self-drilling and self-tapping methods in terms of success. Comparison of the pain between two genders, according to the replantation method, showed a significant difference in pain sensation between two genders. The pain sensation mean in female group was greater than male group.
Background: Investigating and analyzing the dental artery space during a mixed dentition period is very important because it is used in orthodontic treatments planning. The main purpose of this study is to compare the standard Tanaka-Johntson method and simple visual observation in the space analysis in a mixed dentition period and realizing the accuracy of the simple visual observation. Methods Materials: The present study follows a double blind cross-sectional study. Three patients who were in the mixed compare period were selected and six samples were collected from the upper and lower Maxilla duplicate casts. Data were analyzed using ICC and correlation and paired t-test with SPSS 22 software. Results: The general analysis result of the estimated sizes by specialists and residents and the obtained sizes from the Tanaka-Johntson method shows only 28% of the agreement between these two methods. The announced agreement for the sizes was 31% by residents and 22 % by specialists. According to the obtained data, the average difference between specialists and residents was at least one hundredth of a millimeter and the maximum difference was ninety-seven hundredths of a millimeter. Conclusion: The results of the present study show that the estimation of space difference in a simple visual observation method has not an acceptable accuracy in comparison with the Tanaka-Johntson method. In addition, the conducted estimations by residents were also slightly more accurate than that of the specialists.
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