Abstract
The change of the angle and the distance of the x-ray projection were examined with the bite-wing technique that is often used in the pediatric clinic.
The results were as follows:
1. With the condition that the position of the object and the angle of the x-ray film were fixed, and the angle of the x-ray projection was changed, the correlation between the original x-ray film and the experimental x-ray film was over 95 % when the angle was in the range of -6° to +4° on the X-axis, and _-4°to +10° on the Y-axis, and _-10° to +14° on the X-axis and -30° to +30°on the Y-axis, for the dry human mandibula and the dry pig mandibula, respectively.
2. With the condition that the angle of the x-ray projection was fixed against the film and the angle of the object was changed, the correlation between the original film and the experimental film was over 95 % when the angle was in the range of 4°- to +6° on the X-axis and -3° to +30 on the Y-axis for the human mandibula, and -12° to +15° on the X-axis and -15° to +15° on the Y-axis for the pig one.
3. A correlation of over 95% between the original film and the experimental film was found when the distance between object and x-ray film was from 0 to 30 mm.
