Yan Yuwei, Lin Xiao, Yue Xinxin, Geng Wei
Graduate student, Department of Dental Implant Center, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing, PR China.
Attending physician, Department of Dental Implant Center, Beijing Stomatological Hospital, School of Stomatology, Capital Medical University, Beijing, PR China.
J Prosthet Dent. 2023 Oct;130(4):564-572. doi: 10.1016/j.prosdent.2022.03.033. Epub 2022 Jun 3.
Conventional impression techniques for complete arch implant-supported prostheses are technique-sensitive. Stereophotogrammetry (SPG) and intraoral scanning (IOS) may offer an alternative to conventional impression making.
The purpose of this prospective study was to compare the accuracy of IOS and SPG for complete arch implant scans and to evaluate the passive fit of frameworks fabricated with SPG.
Laboratory scanning of gypsum casts, SPG, and IOS were performed for all participants. The data regarding the abutment platform were superimposed to calculate the 3D deviation of SPG and IOS compared with that of laboratory scanning as an evaluation of accuracy. The effect of implant position and number on accuracy was analyzed. The more accurate technique between SPG and IOS was used to fabricate the titanium frameworks, as was laboratory scanning. The passive fit of the frameworks was assessed by clinical examination, the Sheffield test, and panoramic radiography.
Seventeen participants (21 arches, 120 implants) were included. The accuracy of SPG ranged from 2.70 μm to 92.80 μm, with a median (Q1, Q3) of 17.00 (11.68, 22.50) μm, which was significantly more accurate than that of IOS, ranging from 21.30 μm to 815.60 μm, with a median (Q1, Q3) of 48.95 (34.78, 75.88) μm. No significant correlation was found between position or number of implants and 3D deviation in the SPG group. A weak positive correlation was found between implant number and 3D deviation in the IOS group. SPG and laboratory scanning were used to fabricate titanium frameworks. The passive fit between the frameworks and abutment platforms was confirmed.
SPG, which was not affected by position or number of implants, was more accurate than IOS and comparable with laboratory scanning. The frameworks fabricated based on SPG and laboratory scanning were comparable in their passive fit. The SPG technique may be an alternative to laboratory scanning for complete arch implant scans.
用于全牙弓种植体支持修复体的传统印模技术对技术要求较高。立体摄影测量法（SPG）和口内扫描（IOS）可能为传统印模制取提供一种替代方法。
本前瞻性研究的目的是比较IOS和SPG用于全牙弓种植体扫描的准确性，并评估用SPG制作的支架的被动适合性。
对所有参与者进行石膏模型的实验室扫描、SPG和IOS。将基台平台的数据进行叠加，以计算SPG和IOS与实验室扫描相比的三维偏差，作为准确性评估。分析种植体位置和数量对准确性的影响。使用SPG和IOS中更准确的技术以及实验室扫描来制作钛支架。通过临床检查、谢菲尔德试验和全景X线摄影评估支架的被动适合性。
纳入17名参与者（21个牙弓，120颗种植体）。SPG的准确性范围为2.70μm至92.80μm，中位数（Q1，Q3）为17.00（11.68，22.50）μm，明显比IOS更准确，IOS的范围为21.30μm至815.60μm，中位数（Q1，Q3）为48.95（34.78，75.88）μm。在SPG组中，未发现种植体位置或数量与三维偏差之间存在显著相关性。在IOS组中，发现种植体数量与三维偏差之间存在弱正相关。使用SPG和实验室扫描制作钛支架。证实了支架与基台平台之间的被动适合性。
不受种植体位置或数量影响的SPG比IOS更准确，且与实验室扫描相当。基于SPG和实验室扫描制作的支架在被动适合性方面相当。SPG技术可能是全牙弓种植体扫描中实验室扫描的一种替代方法。
