THE DIAGNOSIS OF IMPACTED MAXILLARY MESIODENS USING 3-DIMENSIONAL COMPUTED TOMOGRAPHY : A CASE REPORT

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Journal of the Korean Academy of Pediatric Dentistry 1998;25(3):549-554.
Published online August 31, 1998.

THE DIAGNOSIS OF IMPACTED MAXILLARY MESIODENS USING 3-DIMENSIONAL COMPUTED TOMOGRAPHY : A CASE REPORT

3차원 전산화 단층촬영을 이용한 상악 정중 과잉치의 진단

홍영우, 김성오, 손흥규, 이종갑

연세대학교 치과대학 소아치과학 교실

Abstract

The prevalence of the supernumerary tooth is 1~4%. It usually occurs in the permanent dentition. It frequently occurs in the maxillary mid palatal area. The presence of the supernumerary tooth causes the following problems ; (1) interfering the eruption of successional tooth, (2) displacing the neighboring teeth, (3) resulting large diastema, (4) forming cystic change. So the supernumerary tooth should be removed as soon as possible. To extract the supernumerary tooth, the exact position must be noticed first. Radiographic techniques that were used in the past are tube shift technique, right angle technique, sterioradiography, using radiopaque contrast media and conventional tomography. But these methods include the subjective opinion of the operator. So, a technique eliminating the operator's opinion and showing the position 3-dimentionally can be used. 3-dimentional computed tomography equipped with dental softwares can show the position of the impacted supernumerally tooth in 3-dimentional position. It has an advantage to eliminate the subjective opinion of the operator. With a fast computer this techenique is done in a relatively short period of time. The rationale of this methods is relatively simple. After tacking X-ray and reconstructing the data 3-dimentionally, sequential removal of the soft tissue and hard tissue(bone) CT number leaves the teeth alone in 3-dimentional position. The image can be seen from anywhere, so the operator can see the image in front, rear, upper, and lower positions. In both cases 1 and 2, the position of the impacted supernumerary tooth is viewed by the 3-dimensional computed tomography. And it made the operator easy to figureout the exact position.

Key Words: impaction, mesiodens, computed tomography(CT), 3-dimesion