CBCT和MSCT三维重建颧上颌骨复合体的精度对比OA

Objective To compare the accuracy differences of three-dimensional reconstruction of zygomatic-maxillary complex using cone beam computed tomography(CBCT)and multi-slice spiral computed tomography(MSCT)in the parameters related to zygomatic implantation.Methods Five adult skull specimens(10 zygomatic-maxillary complexes in total)were selected.According to the clinical application characteristics of zygomatic implantation,the parameter location for each skull specimen was conducted,and then CBCT and MSCT were used for scanning and three-dimensional reconstruction.Four parameters were measured on both skull specimens and reconstructed models:the thickness of the maxillary zygomatic process at the intersection of the zygomatic implant path and zygomaticomaxil-lary suture(LB-B1),the thickness of the zygomatic bone at the intersection of the zygomatic implant path and the midpoint of the zygomatic bone surface(LC-C1),the width of the alveolar ridge between the second premolar and the first molar(LAR),and the buccolingual width of the first molar(LM).The specimen group was measured by electronic vernier caliper,and the CBCT group and MSCT group were measured based on CBCT and MSCT.The absolute and relative errors of these four parameters were calculated,and the accuracy of the CBCT and MSCT three-dimensional reconstruction models were analyzed.Results All parameters demonstrated excellent measurement reliability and repeatability,with intra-class correlation coefficient(ICC)≥0.90.The measurement results of each parameter in the CBCT group and the MSCT group showed statistically significant differences compared with those in the specimen group(P<0.05).The measurement result of LM in the CBCT group was smaller than that in the MSCT group,and the difference was statistically significant(P<0.05).However,the measurement results of LB-B1,LC-C1 and LAR in the CBCT group showed no statistically significant difference compared with those in the MSCT group(P>0.05).The mean absolute error and relative error of the LM measurement results to the specimen group in the CBCT group were both smaller than those in the MSCT group,and the differences were statistically significant(P<0.05).There was no statistically significant difference in the mean absolute error or relative error of the LB-B1,LC-C1 and LAR measurement results to the specimen group between the CBCT group and the MSCT group(P>0.05).Conclusion CBCT and MSCT demonstrat comparable accuracy in three-dimensional reconstruction of the zygomatic-maxillary complex.However,CBCT exhibits superior accuracy for fine structures such as dental tissues,which is recommended as the primary choice for imaging data acquisition in zygomatic implantation.