• Title/Summary/Keyword: 치과방사선사진

Search Result 644, Processing Time 0.028 seconds

STUDY OF INVERTLY IMPACTED SUPERNUMERARY TEETH IN THE MIDPALATAL REGION USING COMPUTERIZED TOMOGRAPHY (전산화 단층 방사선사진을 이용한 상악 정중부 역위 매복 과잉치에 관한 연구)

  • Choi, Byung-Jai;Lee, Yong-Seok;Kim, Seong-Oh;Lee, Jae-Ho
    • Journal of the korean academy of Pediatric Dentistry
    • /
    • v.30 no.3
    • /
    • pp.363-372
    • /
    • 2003

  • Supernumerary teeth are found frequently in the dental office causing many dental complications. They are one of the many dental abnormalities that may occur during tooth development. Inversely impacted supernumerary teeth in the midpalatal area are especially important clinically because they occur with high frequency and many complications. Though many previous clinical and radiographical studies exist, the sample numbers were small and the evaluation of shape, location, and effects to its surrounding tissue may not be accurate due to the solitary use of intraoral radiographs or panoramic radiographs. Among the patients who visited department of pediatric dentistry, yonsei dental hospital, from July, 1998 to June, 2002, those with inversely impacted supernumerary teeth took computerized tomography for a more accurate diagnosis. Their dental chart, panoramic radiograph and computerized tomography were evaluated for this study. The number, form, convexity, location, distance, and complications of inversely impacted supernumerary teeth in the midpalatal area were recorded. This study show that when the supernumerary teeth is tuberculated with a curved root and is in close proximity to the adjacent teeth, it causes complications such as eruption disturbance, rotation, displacement of adjacent teeth, and diastema. Such factors must be considered in making decisions for diagnosis and treatment.

  • PDF

The comparison of landmark identification errors and reproducibility between conventional lateral cephalometric radiography and digital lateral cephalometric radiography (일반두부방사선계측사진과 디지털방사선계측사진의 계측점 식별의 오차 및 재현성에 관한 비교 연구)

  • Lee, Yang-Ku;Yang, Won-Sik;Chang, Young-Il
    • The korean journal of orthodontics
    • /
    • v.32 no.2 s.91
    • /
    • pp.79-89
    • /
    • 2002

  • The purpose of this study is to evaluate the reproducibility and errors in landmark identification of conventional lateral cephalometric radiography and digital lateral cephalometric radiography. Fifteen conventional lateral cephalometric radiographs and fifteen digital lateral cephalometric radiographs were selected in adults with no considerations on sex and craniofacial forms. Each landmark was identified and expressed as the coordinate (x, y). The landmarks were classified into 3 groups. The landmarks of the first identification was T1, identification after one week was T2, and identification after one month was T3. The mean and standard deviation of identification errors between replicates were calculated according to the x and y coordinates. The errors between first identification and second identification were expressed as T2-T1(x), T2-T1(y) and those between first identification and third identification were expressed as T3-T1(x), T2-T1(y). Each was divided into conventional lateral cephalometric radiography and digital lateral cephalometric radiography. The independent t- test was used for statistical analysis of identification errors for the evaluation of reproducibility. The results of this study were as follows ; 1. Generally, the mean and standard deviation of landmark identification errors in digital lateral cephalometric radiography was smaller than those of conventional lateral cephalometric radiography. 2. Only a few landmarks showed statistically significant difference in identification error between conventional lateral cephalometric radiography and digital lateral cephalometric radiography. 3. The enhancement of image quality didn't guarantee decrease in landmark identification error and didn't affect tendency of landmark identification error.

  • PDF KSCI