en ارتودنسی Orthodontics پژوهشي Research <p> <strong>Introduction</strong> The aims of this study were to determine the accuracy of volumetric measurements of teeth in vitro by cone-beam computed tomography (CBCT) and to analyze the factors affecting their volume measurements from the CBCT data. </p><p> <strong>Methods</strong> We used a sample of CBCT-scanned (voxel sizes: 0.125, 0.20, 0.25, 0.30, and 0.40 mm) and laser-scanned crowns (n = 40) and roots (n = 32). The Tukey test was used to assess the differences between the CBCT-scan and the laser-scan volumes. </p><p> <strong>Results</strong> There was a statistically significant difference between the laser-scan crown volume and each voxel size of CBCT-scan crown volume (P <0.05). CBCT-scan crown volumes at 0.30 and 0.40 mm were statistically significantly distinct from those at 0.125, 0.20, and 0.25 mm (P <0.05). There was a statistically significant difference between the laser-scan root volume and each voxel size of CBCT-scan root volume (P <0.05). The laser-scan root volume at 0.40 mm was statistically significantly distinct from the volumes at 0.125 and 0.20 mm (P <0.05). The in-vitro volume measurements from the CBCT scans were larger than those of the laser scans: from 21.73% to 43.92% in the crown halves, and from 18.27% to 41.58% in the root halves at the different voxel sizes. </p><p> <strong>Conclusions</strong> With increasing voxel sizes during scanning, the volume measurements of teeth tended to be larger. The surface surrounding artifacts might lead to larger volumes. </p><hr><p></p><p> <strong>Source: </strong>Journal of Orthodontics and Dentofacial Orthopedics </p><p><a href="http://www.ajodo.org/article/PIIS0889540612008116/fulltext" target="_blank"><font color="#0033ff"> Full Text</font></a></p> 0 0 http://idai.ir/browse.php?a_code=A-10-32-766&slc_lang=en&sid=1 Niansong Ye 10031947532846003255 10031947532846003255 No State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China Fan Jian 10031947532846003256 10031947532846003256 No State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China Junjie Xue 10031947532846003257 10031947532846003257 No State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China Sheng Wang 10031947532846003258 10031947532846003258 No State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China Lina Liao 10031947532846003259 10031947532846003259 No State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China Wenya Huang 10031947532846003260 10031947532846003260 No State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China Xing yang 10031947532846003261 10031947532846003261 No State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China yang Zhou 10031947532846003262 10031947532846003262 No State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China Wenli Lai 10031947532846003263 10031947532846003263 Yes State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China Jingtao Li 10031947532846003264 10031947532846003264 No State Key Laboratory of Oral Diseases, West China School of Stomatology, Sichuan University, Chengdu, China