数字化无牙颌种植印模准确度体外比较研究

Comparative Analysis of Precision of Various Digital Impressions for Full-arch Implant-supported Prosthesis

目的:评估在上颌无牙颌种植修复中传统印模、口内扫描技术、多单位桥辅助口内扫描技术及口外扫描技术的准确度差异。方法:使用航空级铝合金制作上颌无牙颌标准模型(包含6枚种植体),采用传统印模法、口内扫描法、多单元桥辅助口内扫描法和口外扫描法分别制取印模,测量4种印模的三维误差,以评估其真实度和精确度。结果:口外扫描法的三维差异较传统印模法、口内扫描法及多单位桥辅助口内扫描法低,其他3组之间无统计学差异。结论:在本实验条件下,口外扫描法获取无牙颌种植印模的准确度更高。

Objective:To evaluate the accuracy of conventional impression,intraoral scanning,multi-unit bridge-assisted intraoral scanning,and stereophotography techniques for maxillary full-arch implant-supported prosthesis.Methods:An aircraft-grade aluminium alloy model of the maxillary edentulous jaw,encompassing six implants,was constructed.Impressions were acquired through conventional techniques,intraoral scanning,multi-unit bridge-assisted intraoral scanning,and stereophotography techniques.The three-dimensional deviation in each of these impressions was measured to evaluate the trueness and precision.Results:The three-dimensional deviation exhibited by stereophotography techniques was less than that of the conventional impression,intraoral scanning,and multi-unit bridge-assisted intraoral scanning.However,there was no statistically significant difference amongst the latter three groups.Conclusion:The stereophotography technique demonstrates superior trueness and precision,establishing itself as an optimal technique for full-arch implant-supported prosthesis.