The aim of the 'Bisecting Angle' is to first create a 90-degree angle between the two planes;
The dental x-ray plate
The teeth
From this 90-degree angle you then create the 'Bisecting Angle' at either a 45-degree, 55-degree or 30-degree angle, depending on species and views you are wanting to create.
In dogs the upper and lower quadrants can be achieved using a 45-degree angle, in cats the upper quadrants can be achieved using a 30-degree angle (to avoid the roots being obscured by the zygomatic arch) and in dogs and cats the upper and lower incisors/canines can be achieved using a 55-degree angle.
Your aim is to create a 'shadow' on the imaging plate of the crown and roots. Think of the sun in the sky and shadow formation. When the sun is at noon, you have a none existent shadow and when the sun is setting, you have an elongated shadow. To get a like for like shadow, you want the sun to be 45/55/30-degree's behind you so that your shadow is a true representation of your height.
The sun is the x-ray tube head, you are the teeth and the ground is the imaging plate. Once you've got your head around that, you'll be taking fantastic x-rays every time! And remember, practice makes perfect!
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