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单词 Buccal object rule
释义

Buccal object rule

英语百科

Buccal object rule

The initial radiograph (left) indicated that a metal foreign object was embedded somewhere in or near the teeth, but upon clinical examination, it could not be found anywhere in the gum tissue. Upon taking another radiograph (right) exposed at a very severe distal angulation, however, the metal fragment appeared to move a great deal to superimpose on the facial aspect of the premolar, indicating that the fragment was way more buccal than initially suspected. With the use of this second film, it was determined that the metal fragment was indeed embedded in the cheek.
Diagrammatic representation of the buccal object rule being employed. In the first radiograph (left), the objects appear on the film in almost the same relationship that they share in reality. But by shifting the x-ray collimator (radiation source) to one side and tilting it towards the objects (right), the objects appear on the film in a distorted relationship. The object closer to the x-ray collimator (generally the buccal object) will appear to reposition itself on the film at a greater distance than the object farther from the collimator (generally the lingual object) and it will appear to shift on the film in the direction of the beam.

The buccal object rule is a method used to determine the relative position of two objects in the oral cavity using projectional dental radiography.
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更新时间：2025/6/17 14:13:22