Fogorvosi szemle, 1996 (89. évfolyam, 1-12. szám)

1996-12-01 / 12. szám

Dr. Fazekas, Á., Dr. Ackermann, G.: File length adjustments using estimations from images produced by conventional radiography

In the present study the estimation-ability of dental students attending the fourth (N=45) and fifth classes (n=48) at the Faculty of Dentistry, Semmelweis University of Medicine, Budapest was examined. Radiographic images of extracted singlerooted teeth were used for this purpose. In the root canal of the teeth size # 15 К files were inserted 1, 2, 3 and 4 mm short of the apical constriction.

In the estimation of length adjustment necessary for the optimal position of the file (1 mm short of the apex) no consistent differences were found between the students in fourth and fifth classes. Length adjustment estimates were significantly less accurate when the file was placed 3 and 4 mm short of the apical constriction (p<0,001). Underestimation of the distance occurred more frequently.

Our results suggest that the completion of two more semesters of practice at shool influences the students ability for length estimation insignificantly. If the discrepancy between the tip of the instrument and the radiographic apex is greater than 2 mm adjustment of the file and exposition of confirmatory radiograph is recommended.

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