平行和分角线投照数字根尖片测量种植体的准确性研究

目的通过比较平行和分角线投照数字根尖片(digital periapical radiographs,DPR)测量种植体长度和直径的准确性,为DPR评价种植体周围骨组织水平提供参考。方法160名患者210颗种植体,按随机数字表法分为平行投照组(80例患者,98颗种植体)和分角线投照组(80例患者,112颗种植体),术后即刻拍摄DPR。利用软件SOPRO Imaging 2.20盲法测量DPR上种植体的直径和长度,然后与种植体实际值比较,利用SPSS软件进行两元方差分析和LSD多重比较,评价两种投照DPR测量的准确性。结果平行投照DPR测量直径和长度与种植体实际值的差值分别为(0.14±0.10)mm、(0.20±0.15)mm,水平和垂直放大倍率分别为1.58%、2.13%;分角线投照DPR测量直径和长度与种植体实际值的差值分别为(0.37±0.22)mm、(1.04±0.47)mm,水平和垂直放大倍率分别为3.90%、10.65%。平行投照DPR测量种植体长度和直径的准确性均优于分角线投照DPR(P<0.05)。结论平行投照DPR能更准确地测量种植体的直径和长度,提示利用平行投照DPR能更准确地评价种植体周围的骨组织水平。

Accuracy of digital periapical radiographs obtained by the paralleling and bisecting-angle technique for implant measurement

Objective To evaluate the accuracy of linear measurements of dental implants obtained from digital periapical radiographs(DPR)by the paralleling and bisecting-angle technique,and provide references for DPR in peri-implant bone tissue assessment.Methods One hundred and sixty patients with 210 implants were divided into two groups randomly:paralleling technique group(80 patients with 98 implants)and bisecting-angle technique group(80 patients with 112 implants).DPRs were taken after implant placement immediately and the diameter and length of implants on DPRs were measured using SOPRO Imaging 2.20 software by blind method.Then the measurements were compared with the actual size of the implants.SPSS software was used to conduct binary analysis of variance and LSD multiple comparison to obtain the level of significance.And the accuracy of two measurement methods was evaluated.Results In the paralleling group,the mean differences between measurements and actual values were(0.14±0.10)mm in diameter and(0.20±0.15)mm in length,with the magnification of 1.58%in horizontal direction and 2.13%in vertical direction.In the bisecting-angle group,the mean differences were(0.37±0.22)mm in diameter and(1.04±0.47)mm in length,while the horizontal and vertical magnification were 3.90%and 10.65%respectively.Paralleling DPR showed a better accuracy than bisecting-angle DPR in measuring the diameter and length of implants(P<0.05).Conclusion Paralleling DPR can obtain a more precise measurement of the diameter and length of the implants,which may be considered as a clinically reliable radiographic examination for implant treatment.