Ultrasonography of Periapical Lesion

Sakuma Kumiko, Ikarugi Yuko, Tanaka Ray, Hayashi Takafumi

doi:10.11242/dentalradiology.47.53

Purpose: To clarify the clinical significance of sonography in the evaluation of periapical lesions in comparison with CT.<BR>Materials and methods: A control case without periapical lesions was examined by sonography and CT to investigate the normal sonographic anatomy around the tooth roots. A total of 8 periapical lesions in 7 patients were also examined by sonography and CT. The patients consisted of 3 males and 4 females ranging in age from 16 to 70 years with a mean age of 46.1 years. We compared sonographic findings of periapical lesions and CT features of cortical bone.<BR>Results: In the control, sonography demonstrated the cortical bone surface with a distinct surface echo but failed to depict the tooth roots. In the patients, periapical lesions were clearly observed on sonography in all of 4 lesions in which marked rupture of the labial / buccal cortical bone was demonstrated on CT. The periapical lesions were interpreted as hypoechoic and tooth root apices were observed within the lesion. Meanwhile, sonography failed to detect periapical lesions in two patients without rupture or thinning of the labial / buccal cortical bone on CT.<BR>Conclusions: Once the labial / buccal cortical bone of the lesion has disrupted, sonography can provide useful information about the extent of the periapical lesions and the location of the tooth root apices. However, no information about the periapical lesions can be expected from sonography if the labial / buccal cortical bone of the lesion remains normal.

Ultrasonography of Periapical Lesion

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