Abstract
Background: Retakes of intra oral radiographs happen frequently in dental practice although radiographic courses train dental students in consecutive semesters.To reduce the patient exposure as much as possible it is mandatory to reduce the number of retakes both in radiology clinics and educational centers.
 Materials and Methods: 3188 periapical radiographs taken by bisect-angle technique was evaluated in this cross-sectional study to assess the frequent errors necessitating retakes. Views were taken by fourth year dental students using bisect angle method. Errors were tabled according to site and type.
 Results: The four major errors that were found in the study included incorrect film placement (35.4%), cone cutting (18.2%), incorrect horizontal angulation (16.6%), and incorrect vertical angulation (14.4%). The distribution of technical errors by anatomic location was identified. Maxillary molar area was the most occurring site for errors. 
 Conclusion: These results suggest that educational programs may be re-evaluated to make the best benefit of educational courses involving both dental and hygiene students.
Highlights
Radiographic imaging is a two-sided coin, which supplies the dentists with invaluable information about the anatomy and status of teeth and supporting bone
Two separate studies reported that film placement and cone cutting and improper vertical angulation were the most common errors, in maxillary and mandibular molar areas [4,5]
In this study errors were mostly prevailed in maxillary molar area by 39.4 % (Table2)
Summary
Radiographic imaging is a two-sided coin, which supplies the dentists with invaluable information about the anatomy and status of teeth and supporting bone. Dental students’ Intra Oral Radiographic Errors and targeting the central ray in horizontal and vertical angles [2]. The most common technical errors are: cone cutting, wrong vertical angulation, wrong horizontal angulation, and improper film placement. Some other errors may occur less frequently such as film bending, motion blur, and double exposure. Two separate studies reported that film placement and cone cutting and improper vertical angulation were the most common errors, in maxillary and mandibular molar areas [4,5]. The present cross-sectional descriptive study was conducted to evaluate intraoral radiographies in regards to the frequency of errors, the types of error necessitating retakes, and the relationship of error frequency to the teeth area examined in bisecting angle intraoral radiographies made by senior dental students.
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