Ozturk Isıl, Caglar Ipek, Duymus Zeynep Yesil
Private Practice, Istanbul, Turkey.
Department of Prosthodontics, Faculty of Dentistry, Recep Tayyip Erdogan University, Islampasa, Kurtuluş St. No: 28, 53020, Rize, Turkey.
Clin Oral Investig. 2022 Jul;26(7):4761-4768. doi: 10.1007/s00784-022-04440-x. Epub 2022 Mar 16.
To evaluate the effect of adjustment and finishing procedures and thermal aging of monolithic zirconia on the surface roughness, phase transformation, and flexural strength.
One hundred disk-shaped monolithic zirconia specimens were randomly divided into 5 groups: control, received only glazing; group Gr, was grinded; group GrP, was grinded and polished; group GrG, was grinded and re-glazed; group GrPG, was re-glazed after grinding and polishing. Half of the each group were stored in distilled water for 24 h and the remaining were thermocycled for 5000 cycles. Topographic evaluations were done with profilometer and scanning electron microscope. Phase changes were assessed through X-ray diffractometer. The biaxial flexural strength test was calculated by universal test machine. Statistical analysis was performed by using two-way ANOVA and Tukey multiple comparison test (p < 0.05).
Group Gr showed statistically higher surface roughness and flexural strength values than the other groups (p < 0.001). However, no significant differences were observed between finishing groups (p >0.05). Phase transformation was occurred in all groups but the differences were not statically significant (p >0.05). Artificial aging had no effect on surface roughness, flexural strength, and phase transformation (p >0.05).
Surface roughness significantly increased after grinding, but finishing procedure approximated it to the control group. Glazing after grinding decreased the flexural strength, but polishing did not. Zirconia polishing system may be an alternative to re-glazing for monolithic zirconia.
Polishing is one of the most effective finishing procedures that can improve the physical properties of the material without damaging its mechanical properties.
评估整体式氧化锆的调改和修整程序以及热老化对其表面粗糙度、相变和抗弯强度的影响。
将100个盘状整体式氧化锆试件随机分为5组：对照组，仅进行上釉；Gr组，进行研磨；GrP组，进行研磨和抛光；GrG组，进行研磨和再次上釉；GrPG组，在研磨和抛光后再次上釉。每组的一半试件在蒸馏水中储存24小时，其余试件进行5000次热循环。使用轮廓仪和扫描电子显微镜进行形貌评估。通过X射线衍射仪评估相变。使用万能试验机计算双轴抗弯强度测试结果。采用双向方差分析和Tukey多重比较检验进行统计分析（p < 0.05）。
Gr组的表面粗糙度和抗弯强度值在统计学上高于其他组（p < 0.001）。然而，修整组之间未观察到显著差异（p > 0.05）。所有组均发生了相变，但差异无统计学意义（p > 0.05）。人工老化对表面粗糙度、抗弯强度和相变无影响（p > 0.05）。
研磨后表面粗糙度显著增加，但修整程序使其接近对照组。研磨后上釉会降低抗弯强度，但抛光不会。氧化锆抛光系统可能是整体式氧化锆再次上釉的一种替代方法。
抛光是最有效的修整程序之一，可在不损害材料机械性能的情况下改善其物理性能。
