关键词: AutoCAD软件, 曲面体层片, 口内根尖片, 牙槽骨水平

Abstract:

Abstract：Objective To assess the agreement between I-Os and OPGs for direct measurements of the area between the cemento-enamel junction （CEJ） and the alveolar bone level （BL） as well as the proportional values in relation to the area from the CEJ to the root apex （RA） using AutoCAD software program. Methods I-Os and OPGs were studied in 53 pairs of cases who had I-Os and OPGs at the same time. The images were measured using AutoCAD software program. The area （S1） from the cemento-enamel junction （CEJ） to the alveolar bone level （BL） and the area （S2） from the CEJ to the root apex （RA） were directly measured between intra-oral radiographs and the same patient's panoramic on the same tooth position. The alveolar bone level was evaluated using the ratio of the area （S1） and the area （S2） was analyzed.The area ratios（S1/S2） of I-Os and OPGs were analyzed. Results There was high correlative consistency on the area ratios of the alveolar bone loss between intra-oral radiographs and the same tooth position's panoramic radiographs. Pearson’s correlation coefficient was 0.982 （P < 0.001），paired T test results suggested that： the difference of the area ratios was not statistically significant between them（t = 1.292，P = 0.202 > 0.05）. Conclusion On I-O and OPG radiograph the area ratios of the alveolar bone loss are in great agreement. It is relatively convenient to measure the area ratios of the alveolar bone loss in the panoramic radiographs using AutoCAD. Hence for periodontal assessments，OPG radiographic readings may，at least in part，can substitute for full-mouth panoramic radiographic evaluation.

Key words: AutoCAD software, panoramic radiographs, intra-oral radiographs, alveolar bone levels