• 구강회복응용과학지
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• 제27권3호
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• pp.267-275
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• 2011

구치부 부분 결손 환자에서 즉시하중군과 지연하중군의 임상적 성공률을 측정하기 위한 전향적 연구가 계획되었다. 즉시하중군에서는 17명의 환자에 42개의 GSIII 임플란트(Osstem, Korea)를 식립하고 48시간 안에 하중을 가하였다. 대조군인 지연하중군에서는 15명의 환자에 27개의 GSIII 임플란트를 식립하고 평균 $2.6{\pm}1.7$개월 후에 하중을 가하였다. 하중 전 1차안정성을 ISQ로 측정하였고 임상증상, 동요도, 연조직 반응을 식립 직후, 3개월 후, 6개월 후, 12개월 후에 평가하였다. 변연골 흡수량은 치근단 방사선 영상으로 측정하였고 Mann-Whitney test (${\alpha}$=0.05)와 repeated measured ANOVA (${\alpha}$=0.05)로 두 군의 차이를 검정하였다. 식립 직후 실험군과 대조군의 ISQ는 각각 $80.3{\pm}7.1$과 $69{\pm}17$이었다. 실험군은 95.23%의 성공률을, 대조군은 100% 성공률을 나타냈다. 3개월과 6개월 후 실험군의 변연골 흡수량은 대조군에 비해 유의성 있게 컸다(p<0.05). 하지만 12개월 후 두 군의 차이는 관찰되지 않았다 (p>0.05). 변연골 흡수량은 성별과 식립위치에 따른 차이가 없었다 (p>0.05). 실험의 한계 내에서, 1차안정성이 획득된다면 구치부 식립 GSIII 임플란트의 즉시하중은 예지성 있는 치료법이라고 여겨진다.

• 치과방사선
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• 제28권1호
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• pp.111-126
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• 1998

In this study, radiographic evaluation was made using panoramic radiography and cross-sectional tomography of SCANORA/sup (R)/ in male and female adults in their 20's on the relationship between the maxillary sinus floor and the apex of the maxillary molar, to test the accuracy and effectiveness of the cross-sectional tomography, and to use this information in the assessment of preop. and postop. root canal treatment, apical surgery, extraction and implantology. Forty-one adults with an average age of 24.4 years were studied using panoramic radiography and cross-sectional tomography. In panoramic view and cross-sectional view, the position of the apices of maxillary molars were classified as separated, contacted, or protruded type; the general shape of the maxillary sinus floor was evaluated horizontally and vertically from cross-sectional tomography. The accuracy of each radiography was tested using maxilla from 5 fresh cadavers from the Anatomy Lab at Yonsei University Dental College, and panoramic view and cross-sectional tomography were taken in the same condition as with the patients. The results were as follows: 1. Panoramic view and cross-sectional view were taken in the maxilla specimen, and the actual distance between the maxillary sinus floor and the tooth apices were measured in the specimen; the median values of the distance from the tooth apices to the maxillary sinus floor in the panoramic view, cross-sectional view and in the actual maxilla specimen were 2.83 mm, 4.51mm, and 4.l5mm, respectively. In the cross-sectional view, the measured distance was close to the actual distance but in the panoramic view, the measured distance was far from the actual distance. 2. When the results of the panoramic view and cross-sectional view were compared, 40.5％ of the results agreed with each other in the two radiographic methods and buccal roots of the 2nd molar were the closest to the maxillary sinus floor in the cross-sectional tomography. 3. In cross-sectional view, when the vertical relationship of the maxillary sinus floor and maxillary roots was assessed, in 1st molars, type II (the sinus floor that extends down to the buccolingual furcation area) was predominant, while in 2nd molars, type I (the sinus floor located above the level connecting the buccal and lingual apices) was predominant. In the horizontal relationship, in 1st molars, type II (the lowest floor of the maxillary sinus located in between the buccal and lingual roots) was predominant; in 2nd molars, type I (the lowest floor of the maxillary sinus located on the buccal side of the buccal roots) and type II appeared in similar frequency. In conclusion, the SCANORA/sup (R)/ cross-sectional tomography was more effective than the frequently used panoramic view, in that the relationship of the maxillary molars and maxillary sinus floor can be evaluated more accurately and the buccolingual cross-sectional view can also be observed. And maxillary sinus floor that was close to maxillary 2nd molar had tendency to be located on buccal side than that close to 1st molar. Therefore, cross-sectional tomography is an effective and accurate method to evaluate the position of the teeth in relation to the sinus floor preoperative and can be easily used to diagnose localized periapical lesions. Also, the image quality obtained was quite satisfactory.