Department of Oral and Maxillofacial Surgery, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Huangshadadao Road 39, Guangzhou, 510182, China.
Department of Stomatology, The Eighth People Hospital of Guangzhou, Huayinglu Road 8, Guangzhou, 510060, China.
BMC Oral Health. 2020 Nov 4;20(1):306. doi: 10.1186/s12903-020-01297-y.
Implant location is performed after placement to verify that the safety of neighboring anatomic structure and the realizability of prosthetic plan. Routine postoperative location is based on radiological scanning and raises the concerns on radiation exposure and inconveniency in practice. In the present study a location method based on surface scanning was introduced and the accuracy of this method was assessed in vitro.
A total of 40 implants were placed in 10 resin mandible models. The models were scanned with intraoral scanner (IS group) and extraoral scanner (ES group). The implant position was located with fusing the images of surface scanning and cone beam computerized tomography (CBCT) after implant placement. Deviations were measured between positions located by surface scanner and postoperative CBCT with the parameters: central deviation at apex (cda), central deviation at hex (cdh), horizontal deviation at apex (hda), horizontal deviation at hex (hdh), vertical deviation at apex (vda), vertical deviation at hex (vdh) and angular deviation (ad).
In IS group, the mean value of cda, cdh, hda, hdh, vda, vdh and ad was 0.27 mm, 0.23 mm, 0.12 mm, 0.10 mm, 0.21 mm, 0.19 mm and 0.72°, respectively. In ES group, the mean value of cda, cdh, hda, hdh, vda, vdh and ad was 0.28 mm, 0.25 mm 0.14 mm, 0.11 mm, 0.22 mm, 0.20 mm and 0.68°, respectively. The implant deviations in IS and ES groups were of no significant difference for any of the measurements.
Dental implant can be located via surface scanner with acceptable accuracy for postoperative verification. Further clinical investigation is needed to assess the feasibility of the method.
植入物的位置是在植入后进行的，以验证邻近解剖结构的安全性和假体计划的可实现性。常规的术后定位基于放射学扫描，这引起了对辐射暴露和实践不便的关注。在本研究中，引入了一种基于表面扫描的定位方法，并在体外评估了该方法的准确性。
共将 40 个种植体放置在 10 个树脂下颌模型中。模型用口腔内扫描仪（IS 组）和口腔外扫描仪（ES 组）进行扫描。在植入后，通过融合表面扫描和锥形束计算机断层扫描（CBCT）的图像来定位植入物的位置。用以下参数测量表面扫描仪和术后 CBCT 定位的偏差：根尖中央偏差（cda）、六角中央偏差（cdh）、根尖水平偏差（hda）、六角水平偏差（hdh）、根尖垂直偏差（vda）、六角垂直偏差（vdh）和角度偏差（ad）。
在 IS 组中，cda、cdh、hda、hdh、vda、vdh 和 ad 的平均值分别为 0.27mm、0.23mm、0.12mm、0.10mm、0.21mm、0.19mm 和 0.72°。在 ES 组中，cda、cdh、hda、hdh、vda、vdh 和 ad 的平均值分别为 0.28mm、0.25mm、0.14mm、0.11mm、0.22mm、0.20mm 和 0.68°。IS 和 ES 组的种植体偏差在任何测量值上均无统计学差异。
通过表面扫描仪可以以可接受的精度定位牙科种植体，用于术后验证。需要进一步的临床研究来评估该方法的可行性。
