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State PSC PYQ - 3 Questions
The paralleling technique in intraoral periapical radiography is based on the principle of using parallel lines and right angles to produce an accurate image of the tooth structure.This method requires the image receptor (film or sensor) to be positioned parallel to the long axis of the tooth being radiographed.To prevent image distortion (magnification or foreshortening), the central ray of the X-ray beam is then directed perpendicularly to both the image receptor and the long axis of the tooth.
According to the inverse square law, intensity ? 1/(distance²). Doubling the distance decreases the intensity to 1/4 of the original value.
Aggressive periodontitis is characterized by rapid attachment loss and bone destruction, but the amount of microbial deposits (plaque and calculus) is typically inconsistent with the severity of the destruction, often appearing minimal. The other options (deep pockets in all areas, increased mobility without clinical signs, widespread gingival recession) are general signs of periodontal disease but not specific diagnostic features that differentiate aggressive from chronic forms.
MCQ