Jain Teerthesh, Porwal Amit, Babu Sumanth, Khan Zahid A, Kaur Chandeep, Jain Ranu B
Department of Substitutive Dental Sciences, Imam Abdul Rahman Bin Faisal University, Dammam, Kingdom of Saudi Arabia, Phone: +9696945492, e-mail:
Department of Substitutive Dental Sciences, Jazan University Jazan, Kingdom of Saudi Arabia.
J Contemp Dent Pract. 2018 Mar 1;19(3):318-323.
Ceramics are widely applied in dentistry owing to their excellent mechanical and physical attributes. The most popular ceramics are Lava™, KaVo Everest, and Cercon. However, it is unclear whether or not a different surface treatment along with low-temperature aging and mechanical loading (ML) affects the physical properties of computer-aided design (CAD)/computer-aided manufacturing (CAM)-machined yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) ceramic.
The objective of this research was to assess the impact of various surface treatments as air-particle abrasion, ML, low-temperature degradation (LTD), and their cumulative effects on biaxial flexural properties of Y-TZP.
Totally, 50 specimens were fabricated by CAD-CAM machining from Cercon® and divided into five groups following different surface treatments as control (C), air-particle abrasion (Si), ML, LTD, and cumulative treatment (CT) group. Results were investigated by two-way analysis of variance (ANOVA) and Tukey honest significant difference (HSD) test.
The highest biaxial flexural strength was observed in the Si group (950.2 ± 126.7 MPa), followed by the LTD group (861.3 ± 166.8 MPa), CT group (851.2 ± 126.5 MPa), and the least with ML (820 ± 110 MPa). A significant difference was observed in the two-way ANOVA test. X-ray diffraction (XRD) analysis showed that the control group consists of 100% tetragonal zirconia and the maximum amount of monoclinic phase was obtained after LTD.
No negative effect on biaxial flexural strength was observed; indeed, it increases the biaxial strength. Hence, these surface treatments can be done in routine clinical practice to improve the performance of ceramic restoration.
由于具有优异的机械和物理特性，陶瓷在牙科领域得到广泛应用。最常用的陶瓷有Lava™、KaVo Everest和Cercon。然而，不同的表面处理以及低温时效和机械加载（ML）是否会影响计算机辅助设计（CAD）/计算机辅助制造（CAM）加工的氧化钇稳定四方多晶氧化锆（Y-TZP）陶瓷的物理性能尚不清楚。
本研究的目的是评估各种表面处理（如空气颗粒研磨、ML、低温降解（LTD））及其累积效应对Y-TZP双轴弯曲性能的影响。
总共通过CAD-CAM加工从Cercon®制作了50个试样，并根据不同的表面处理分为五组，即对照组（C）、空气颗粒研磨组（Si）、ML组、LTD组和累积处理组（CT）。通过双向方差分析（ANOVA）和Tukey诚实显著差异（HSD）检验对结果进行研究。
Si组的双轴弯曲强度最高（950.2±126.7MPa），其次是LTD组（861.3±166.8MPa）、CT组（851.2±126.5MPa），最低的是ML组（820±110MPa）。双向ANOVA检验显示存在显著差异。X射线衍射（XRD）分析表明，对照组由100%的四方氧化锆组成，LTD处理后获得的单斜相含量最高。
未观察到对双轴弯曲强度有负面影响；实际上，它提高了双轴强度。因此，这些表面处理可在常规临床实践中进行，以改善陶瓷修复体的性能。
