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Buccal object rule
The buccal object rule is a method used to determine the relative position of two objects in the oral cavity using projectional dental radiography.
==Clark's Rule==
In 1909, Clark described a radiographic procedure for localizing impacted teeth to determining their relative antero-posterior position.〔Clark CA. A method of ascertaining the relative position of unerupted teeth by means of film radiographs. ''Royal Society of Medicine Transactions'' 1909;3:87-90〕 If the two teeth (or, by extension, any two objects, such as a tooth and a foreign object) are located in front of one another relative to the x-ray beam, they will appear superimposed on one another on a dental radiograph, but it will be impossible to know which one is in front of the other. To determine which is in front and which is behind, Clark proposed his (SLOB rule ), as a complicated set of three radiographs, but which can be simplified as follows using just two:
:Expose another film while angle of the x-ray beam has been changed. If an object moves in the ''same'' direction as the source of the x-ray beam, it is ''lingual'' to the other object. If the object moves in the ''opposite'' direction of the source, it is ''buccal'' to the other object.
:Same Lingual; Opposite Buccal
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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