Svanborg Per
Department of Prosthodontics/Dental Materials Science, Institute of Odontology, The Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden.
Biomater Investig Dent. 2020 Jan 7;7(1):9-15. doi: 10.1080/26415275.2019.1708202. eCollection 2020.
The aim of this study was to review the fit and assess the accuracy of tooth-supported single and multi-unit zirconia fixed dental prostheses. The fit of zirconia restorations has been reported in several studies, but the accuracy of the manufacturing process is seldom discussed or used when drawing conclusions on the fit. A literature search of articles published in PubMed between 2 March 2013 and 1 February 2018 was performed using clearly defined inclusion and exclusion criteria. 841 articles were found and 767 were excluded after screening the title and abstract. After full-text analysis another 60 articles were excluded which left 14 articles to be included for data extraction. Fit was the mean of distances reported in the studies and accuracy was the fit minus the pre-set spacer For marginal gap of single crowns and multi-unit FDPs combined, the fit was 83 μm and the accuracy was 59 μm. The internal gap fit was 111 μm and the accuracy 61 μm. For the total gap, the fit was 101 μm, and the accuracy of the zirconia restorations was 53 μm. Within the limitations of the present systematic review the fit of zirconia single crowns and multi-unit FDPs may be regarded as clinically acceptable, and the accuracy of the manufacturing of zirconia is ∼60 μm for marginal, internal, and total gap. Also, digital impressions seem to be associated with a smaller gap value.
本研究的目的是评估牙支持式单单位和多单位氧化锆固定义齿的适合性并评价其准确性。已有多项研究报道了氧化锆修复体的适合性，但在得出关于适合性的结论时，很少讨论或使用制造工艺的准确性。使用明确界定的纳入和排除标准，对2013年3月2日至2018年2月1日期间发表在PubMed上的文章进行了文献检索。共找到841篇文章，在筛选标题和摘要后排除了767篇。经过全文分析，又排除了60篇文章，剩下14篇文章纳入数据提取。适合性为研究中报道的距离的平均值，准确性为适合性减去预设的间隙。对于单冠和多单位固定义齿的边缘间隙总和，适合性为83μm，准确性为59μm。内部间隙适合性为111μm，准确性为61μm。对于总间隙，适合性为101μm，氧化锆修复体的准确性为53μm。在本系统评价的局限性范围内，氧化锆单冠和多单位固定义齿的适合性可被视为临床可接受，氧化锆制造的边缘、内部和总间隙的准确性约为60μm。此外，数字印模似乎与较小的间隙值相关。
