What are the different techniques of intraoral radiography?
Two types of exposure techniques may be used for intraoral periapical radiography: the paralleling and the bisecting angle technique (Figures 1 and 2). With the paralleling technique, the tooth and the sensor are both kept on a parallel planes.
What is overlapping in radiography?
PROJECTION GEOMETRY. One of the most common errors when exposing bitewing images is failing to prevent horizontal overlapping. Horizontal overlap is a result of the X-ray beam not passing through the open interproximal area at right angles to a properly positioned detector.
What are two types of extraoral radiography?
There are several types of extraoral X-rays.
- Panoramic X-rays show the entire mouth area — all the teeth in both the upper and lower jaws — on a single X-ray.
- Tomograms show a particular layer or “slice” of the mouth and blur out other layers.
- Cephalometric projections show an entire side of the head.
What is paralleling technique in dental radiography?
The paralleling technique is the most commonly used technique for exposing periapical and bitewing radiographs because it creates the most accurate representation of a tooth image. It refers to the receptor being positioned parallel to the full length (long axis) of the tooth being radiographed.
Why is bisected angle technique used in dental radiography?
Introduction. This technique is used in areas where the parallel technique is impossible due to poor access, making the angle between tooth and film more than 15 degrees. Using this technique, a true image of the tooth length and width is obtained.
What is a cone cut?
(kōn’kŭt) Manifestation visible in a dental radiograph in which a portion of the image is missing due to the radiation beam’s having been blocked by improper aim of the cone or position-indicating device (q.v.).
What is extraoral radiograph?
Abstract. Extraoral radiography means that both the image detector and the X-ray machine are placed outside the patient’s mouth. The X-ray source and the image detector have to be aligned in order to generate the desired image quality.
What is PID in radiography?
The X-rays then travel through the PID (positioning indicator device) where the X-ray beam exposes the receptor. The X-ray head and the PID are lead lined to contain the X-rays and prevent unnecessary radiation exposure to the patient and the operator. The PID is also called a cone.
What does it mean if an angle is bisected?
An angle bisector is a line or ray that divides an angle into two congruent angles . In the figure, the ray →KM bisects the angle ∠JKL .
