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Abstract
Backgraound and Aim: One of the dentists’ concerns is the reliability of tooth shade selection. This research has been done regarding to the increase in patients’ expectation of beauty, the importance of conformity in restorative materials for success in beauty restorations and also due to lack of enough research in this field.
This study is designed to determine the reliability of tooth shade selection done by student of semester10,11 by using vita Classic system at Tehran Islamic Azad University of dentistry in 2015.
 
Materials and Methods: This cross sectional study has been done on 60 students of dentistry  who had no color-blindness. Ishihara color-blindness test was taken from all of the students  and then they were asked to choose the color of patients’ left maxillary central incisor by using four vita Classic shade guide kits with unknown codes. In order to unify the condition, the patient was asked to brush her teeth and remove her makeup. The light was assimilated by using “day light” device that was made in Taiwan and also tooth shade selection test was done in 30 centimeters distance from the patients and no time limitation. A grey screen was used to prevent eyestrain. After 10 days, the experiment was repeated with mentioned conditions.
Results: The reliability of shade selection in students (R) was 0.96 or 96% and the congruency (R²) was 81 percent. 65 % of excellent reliability and 24 % of good reliability and 8 moderate reliability and 3% of low reliability  existed among residents. Relevant factors like gender,  wearing glasses and academic semester .Specialty weren’t  statistically significant(p<0.2).
Conclusion: It saems there is high reliability of shade selection in students.It doesnot have any relations connections to other factors.
 
     
Type of Study: Original | Subject: dentistry
Received: 2019/12/2 | Accepted: 2020/02/16

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