Abstract
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.
Highlights
Investigating and analyzing space in a dental artery during a mixed dentition period is very important as it is used in orthodontic treatments planning
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
Considering the studied subject, i.e. the accuracy of the size stated by the dentist, agreement indicators were required. These indicators are measured in quantitative variables based on ICC and in qualitative variables based on sensitivity and specificity indicators, and the results are expressed in the ROC chart
Summary
Investigating and analyzing space in a dental artery during a mixed dentition period is very important as it is used in orthodontic treatments planning. In some studies such as Zaem [3], Khanemasjedi and Basir [4], Arash and Mirkazemi [5], Hambir and Sojan [6], Jiavali et al [7], it has been claimed that Tanaka-Johnston method is only conducted and introduced to North American patients, and racial factors can affect the information derived from the Tanaka-Johnston method and reduce its accuracy for communities with different ethnic origins Another method that has been used in dental clinics to estimate the space difference is the direct observation of OPG radiography and gypsum casts [11]. The conducted estimations by residents were slightly more accurate than that of the specialists
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