A comparison of paralleling and bisecting radiographic techniques as experienced by dental students
Evaluation of 8,726 periapical radiographs made by 158 dental students revealed 9 per cent less technical errors when the students applied the paralleling technique and used the XCP and the Precision x-ray instruments than when they applied the bisecting-angle technique and used the Snap-A-Ray film holder. In applying the bisecting-angle technique, the most frequent errors noted were improper film positioning, incorrect vertical angulation, cone-cutting, and incorrect horizontal angulation. In applying the paralleling technique, the most frequent errors were improper film positioning and faulty horizontal angulation. © 1972.
Mourshed, Farouk and McKinney, A. Lorenzo, "A comparison of paralleling and bisecting radiographic techniques as experienced by dental students" (1972). College of Dentistry Faculty Publications. 208.