Hajhamid Beshr, Alfrisany Najm, Somogyi-Ganss Eszter
Faculty of Dentistry, University of Toronto, 124 Edward St, Toronto, ON M5G1G6, Canada.
Faculty of Dentistry, University of Toronto, 124 Edward St, Toronto, ON M5G1G6, Canada; Dental Health Department, College of Applied Medical Sciences, King Saud University, Riyadh 12372, Saudi Arabia.
Dent Mater. 2022 Apr;38(4):569-586. doi: 10.1016/j.dental.2022.02.005. Epub 2022 Mar 5.
This study aimed to systematically review the literature related to the impact of low temperature degradation (LTD) on the crystalline structures and optical properties of different types of dental monolithic zirconia materials.
The systemic review was performed based on the PRISMA statement. In vitro studies investigating the effect of accelerated aging in autoclave (2 bar pressure 134°C - ISO standard 13356-2008) on the crystalline structure and/or optical properties of Yttria-partially stabilized zirconia (Y-PSZ) were included. Specific search terms were used for peer-reviewed articles published in PubMed, Ovid MEDLINE, and EMBASE databases.
From 286 eligible articles, 51 articles were selected for full-text analysis, 10 failed to meet the inclusion criteria, and 41 articles were included in this review. Autoclave aging (30 min - 300 h) results in an increase in monoclinic phase (m) content up to 80% for tetragonal zirconia and reaching saturation after 35 h of autoclave aging. All included articles reported less than 1% of monoclinic phase for cubic zirconia after autoclave aging. Translucency parameter was reported between 2.34 and 19.7 after autoclave aging (4-100 h). For same aging time, contrast ratio ranged between 0.48 and 0.95.
An increase in monoclinic phase was reported for tetragonal zirconia, while cubic zirconia demonstrates resistance to LTD. The optical properties for all zirconia materials investigated seem more compromised with increasing aging time.
本研究旨在系统回顾与低温降解（LTD）对不同类型牙科整体式氧化锆材料晶体结构和光学性能影响相关的文献。
基于PRISMA声明进行系统评价。纳入研究在高压釜（2巴压力134°C - ISO标准13356 - 2008）中加速老化对钇部分稳定氧化锆（Y - PSZ）晶体结构和/或光学性能影响的体外研究。使用特定检索词检索在PubMed、Ovid MEDLINE和EMBASE数据库中发表的同行评审文章。
从286篇符合条件的文章中，选择51篇进行全文分析，10篇未符合纳入标准，41篇纳入本综述。高压釜老化（30分钟 - 300小时）导致四方氧化锆的单斜相（m）含量增加高达80%，高压釜老化35小时后达到饱和。所有纳入文章报道立方氧化锆在高压釜老化后单斜相含量低于1%。高压釜老化（4 - 100小时）后报道的透明度参数在2.34至19.7之间。对于相同的老化时间，对比度在0.48至0.95之间。
报道四方氧化锆单斜相增加，而立方氧化锆对LTD具有抗性。所研究的所有氧化锆材料的光学性能似乎随着老化时间的增加而更受影响。
