CBCT를 이용한 성장 완료 전후 상악 제1대구치 치근단과 주변 치밀골의 위치관계 비교

Abstract

This study was performed to evaluate the relationship of the adjacent cortical bone and the palatal, mesiobuccal, distobuccal root apex of maxillary 1st molar and that the tooth movement is highly required in clinically. Group A was consisted of 17 samples mean age of 11 years 10 months and Group B was 16 samples mean age of 18 years 8 months and CBCT images were obtained for the samples. The images were reconstructed and analysed by AccurexTM software and the following results were obtained; 1. The CBCT images showing the relationship of the root apex of the maxillary 1st molar and the adjacent cortical bone were reconstructed and the multiplicity was shown at the both Group A and B. 2. The distances to the lower wall of maxillary sinus from the palatal, mesiobuccal, distobuccal root apex of maxillary 1st molar were 3.93 ± 1.72 mm, 2.72 ± 0.98 mm, 2.49 ±0.76 mm respectively in Group A and 2.23 ± 0.41 mm, 2.50 ± 1.25 mm, 2.17 ± 0.83 mm respectively in Group B. The difference in the measurement of palatal root apex between two Groups was shown the statistical significance. 3. The frequency of more than one root apex of maxillary 1st molar contacting or projecting to maxillary sinus was higher in Group B than Group A. From the above results, multiplicity can be seen in the relationship between the root apex of maxillary molar and adjacent cortical bone and that they are located very closely and even contact or projected in the maxillary sinus with relatively high frequency. So, the efficient tooth movement and orthodontic treatment can be possible with the application of orthodontic force under the consideration of anatomical structure around the root apex and adjacent cortical bone and proximity of them.