Svanborg Per, Hjalmarsson Lars
Department of Prosthodontics/Dental Materials Science, Institute of Odontology, Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden.
Specialist Dental Clinic, Folktandvården Sörmland AB, Mälar Hospital, Eskilstuna, Sweden.
Biomater Investig Dent. 2020 Jan 20;7(1):31-40. doi: 10.1080/26415275.2020.1714445. eCollection 2020.
To compare the fit and assess the accuracy of tooth-supported single and multi-unit FDPs in cobalt chromium fabricated using different manufacturing techniques. A systematic search was performed in three databases; PubMed, Scopus, and Web of Science, using clearly specified search terms and inclusion criteria. The search yielded 1071 articles and included 18 articles in the analysis. Data regarding the fit analyses and the methods of manufacturing were extracted and the accuracy was defined as the fit result minus the pre-set cement spacer. Internal gap (IntG) was the mean of all the internal measuring points and total gap (TotG) was the mean of all measuring points (marginal, cervical, chamfer, axial, occlusal). The total gap results for fit and accuracy irrespective of manufacturing technique were 96 μm and 54 μm for single crowns, 107 μm and 54 μm for multi-unit FDPs, and 98 μm and 54 μm for both single crowns and multi-unit FDPs combined. For total gap of single crowns soft milling had the highest accuracy, for multi-unit FDPs additive manufactured restorations had the highest accuracy. With the results grouped by impression technique, the accuracy for total gap was highest for digital impressions and lower for conventional impressions. Due to the inherent limitations of this systematic review, it still remains unclear what effect the manufacturing technique has on the fit of FDPs. However, the descriptive results suggest that the marginal fit of cobalt chromium FDPs is not negatively affected by the manufacturing technique.
比较采用不同制造技术制作的钴铬合金牙支持式单单位和多单位固定局部义齿的适合性并评估其准确性。在三个数据库（PubMed、Scopus和Web of Science）中进行了系统检索，使用明确指定的检索词和纳入标准。检索得到1071篇文章，分析纳入了18篇文章。提取了关于适合性分析和制造方法的数据，准确性定义为适合性结果减去预设的粘结剂间隙。内部间隙（IntG）是所有内部测量点的平均值，总间隙（TotG）是所有测量点（边缘、颈部、肩台、轴向、咬合面）的平均值。无论制造技术如何，单冠的适合性和准确性的总间隙结果分别为96μm和54μm，多单位固定局部义齿为107μm和54μm，单冠和多单位固定局部义齿组合为98μm和54μm。对于单冠的总间隙，软铣削的准确性最高，对于多单位固定局部义齿，增材制造修复体的准确性最高。按印模技术分组结果显示，数字印模的总间隙准确性最高，传统印模的准确性较低。由于本系统评价存在固有局限性，制造技术对固定局部义齿适合性的影响仍不清楚。然而，描述性结果表明，制造技术对钴铬合金固定局部义齿的边缘适合性没有负面影响。
