Rautenbach Z, Haiek M, Ruales-Carrera E, Özcan M
University of Zurich, Center for Dental Medicine, Clinic of Masticatory Disorders and Dental Biomaterials, Zurich, Switzerland.
Hebrew University-Hadassah, Faculty of Dental Medicine, Department of Prosthodontics, Jerusalem, Israel.
J Mech Behav Biomed Mater. 2025 Sep;169:107064. doi: 10.1016/j.jmbbm.2025.107064. Epub 2025 May 21.
The objective of this systematic review and meta-analysis was to analyze the impact of grinding using burs with different grain size under dry and wet conditions for conventional and translucent zirconia on the degree of phase transformation.
Two independent reviewers conducted an electronic search on BBO, Embase, LILACS, MEDLINE, Scopus, Web of Science and WPRIM to identify publications in English language, from January 1995 to April 2023, conforming to PRISMA guidelines for systematic reviews for in vitro studies and reported on the outcome measure of phase transformation of zirconia as a function of grinding protocols. The data were analyzed for tetragonal to monoclinic phase transformation as a primary outcome.
A total of 3157 titles were identified during the search process. Of these, 59 full-text articles were assessed, resulting in the inclusion of 34 studies for the systematic review and 12 studies for the meta-analysis. According to the study groups included, the following types of burs and conditions could be analyzed: coarse burs - wet; coarse burs - dry; medium burs - dry; fine and extra-fine burs - wet and dry conditions. With coarse burs, under dry conditions, mean phase transformation ranged from 0 to 6.3 %. Pooled mean percentage of monoclinic phase transformation was 4.308 % (95 % CI: 3.697-4.919), with a prediction interval ranging from 2.064 % to 6.552 %. In contrast, wet conditions resulted in a significantly higher pooled mean percentage of monoclinic phase transformation at 7.812 % (95 % CI: 5.878-9.745) with the prediction interval ranging from 0.181 % to 15.442 %. With medium burs, under dry conditions, phase transformation varied between 4.976 and 7.023 % with a prediction interval of 4.518 %-6.973 %. The phase transformation under dry and wet conditions for fine to extra-fine grinding ranged from 7.47 to 9.7 %. These results were statistically significant for individual sub-study groups compared to control groups (p < 0.001).
The results of this meta-analysis underscored the importance of operational conditions and material processing techniques in influencing phase transformation yet demonstrating values well below the ISO 13356:2008 recommendation for monoclinic phase transformation which is to be maximum 25 % to ensure biomedical reliability.
CRD42023424918.
本系统评价和荟萃分析的目的是分析在干法和湿法条件下，使用不同粒度的车针研磨传统氧化锆和半透明氧化锆对相变程度的影响。
两名独立评审员在BBO、Embase、LILACS、MEDLINE、Scopus、Web of Science和WPRIM上进行电子检索，以识别1995年1月至2023年4月期间符合PRISMA体外研究系统评价指南且报告了氧化锆相变结果测量值与研磨方案函数关系的英文出版物。以四方相向单斜相的转变作为主要结果进行数据分析。
检索过程中共识别出3157个标题。其中，评估了59篇全文文章，最终纳入34项研究进行系统评价，12项研究进行荟萃分析。根据纳入的研究组，可以分析以下类型的车针和条件：粗车针 - 湿法；粗车针 - 干法；中车针 - 干法；细车针和超细车针 - 湿法和干法条件。对于粗车针，在干法条件下，平均相变范围为0%至6.3%。单斜相转变的合并平均百分比为4.308%（95%CI：3.697 - 4.919），预测区间为2.064%至6.552%。相比之下，湿法条件下单斜相转变的合并平均百分比显著更高，为7.812%（95%CI：5.878 - 9.745），预测区间为0.181%至15.442%。对于中车针，在干法条件下，相变在4.976%至7.023%之间变化，预测区间为4.518% - 6.973%。细磨至超细磨在干法和湿法条件下的相变范围为7.47%至9.7%。与对照组相比，这些结果在各个亚研究组中具有统计学意义（p < 0.）。
本荟萃分析的结果强调了操作条件和材料加工技术在影响相变方面的重要性，同时表明其值远低于ISO 13356:2008关于单斜相转变的建议值，即最大为25%，以确保生物医学可靠性。
CRD42023424918。
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