EVALUATION OF BIAXIAL FLEXURAL STRENGTH AND TRANSLUCENCY OF MULTICHROMATIC TRANSLUCENT ZIRCONIA AND LITHIUM DISILICATE CERAMICS
EVALUATION OF BIAXIAL FLEXURAL STRENGTH AND TRANSLUCENCY OF MULTICHROMATIC TRANSLUCENT ZIRCONIA AND LITHIUM DISILICATE CERAMICS
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多色半透明氧化锆和二硅酸锂陶瓷的双轴弯曲强度和半透明性评价
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
F. H. Abbassy
中科院分区：
文献类型：
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作者：
Jihad G. Hamed;S. Bakry;S. Hussein;F. H. Abbassy
简介：全轮廓（单片）氧化锆陶瓷越来越受欢迎。高透光氧化锆材料和多层氧化锆块可能有助于克服传统氧化锆用于制造单片陶瓷的美学缺陷。评价CAD/CAM：多色超透光氧化锆的双轴弯曲强度和透光性，并将其与多色高透光性二硅酸锂玻璃陶瓷进行比较。材料与方法40个陶瓷试件分为两大组：I组：CAD/CAM多色超透明氧化锆（UTML KATANA Zirconia）; II组：可压制多色高透明二硅酸锂微晶玻璃（maxpressmulti）。每组又分为两个亚组; A亚组：制作圆盘样本（直径12 mm ×厚度1.5mm）（n=10）并进行热循环（500次循环，5°/55°C，15秒停留时间）。然后测量双向弯曲强度，单位为MPa。亚组B：制作12 mm长× 10 mm宽× 1.5 mm厚的矩形标本（n=10）。采用分光光度分析法，通过浊度参数（TP）评价和比较浊度的大小。资料以学生t检定及变异数分析与重复测量检定进行分析。结果使用Student t检验对双轴弯曲强度进行统计学分析，显示组I（607.24 ± 71.79）的双轴弯曲强度值高于组II（290.69 ± 41.19）（p <0.001*），具有统计学显著性。半透明性结果显示，两个亚组之间存在显著的统计学差异，其中IPS e.max Press Multi的半透明性优于UTML KATANA氧化锆。结论：与二硅酸锂相比，多层氧化锆显示出更高的机械性能，但光学性能较低。多层氧化锆显示出具有不同透光能力的四个层。因此，它可能是有用的，以提高美学外观的全轮廓氧化锆陶瓷由这种材料制成的应力承受区域。
INTRODUCTION: Full-contour (monolithic) zirconia restorations are gaining in popularity. High translucent zirconia materials and multilayered zirconia blocks might help to overcome the aesthetic drawbacks of traditional zirconia for fabrication of monolithic restorations OBJECTIVES: Were to evaluate the biaxial flexural strength and translucency of CAD/CAM: multichromatic ultra-translucent zirconia and comparing it with multichromatic high translucency Lithium Disilicate glass-ceramic. MATERIALS AND METHODS40 ceramic specimens were divided into two main groups; Group I: CAD/CAM multichromatic ultratranslucent Zirconia( UTML KATANA Zirconia) & Group II: Pressable multichromatic high translucent Lithium Disilicate glass-ceramic (e.max press multi). Each group was subdivided into two sub groups; sub group A: disc specimens (12mm diameter×1.5mm thickness) were fabricated (n=10) & thermocycled (500 cycles, 5°/55°C, 15 sec dwell time).Then, biaxial flexural strength was measured in MPa. Sub group B: rectangular specimens (12mm length × 10mm width × 1.5mm thickness) were fabricated (n=10). Spectrophotometric analysis was conducted to evaluate and compare the degree of translucency by translucency parameter (TP). Data were analyzed using student t-test & ANOVA with repeated measures test. RESULTS Statistical analysis of Biaxial flexural strength using student t-test revealed that group I (607.24 ± 71.79) showed higher statistically significant biaxial flexural strength values than group II (290.69 ± 41.19) ( p <0.001*). Results of translucency revealed that there were significant statistical differences between the two subgroups where IPS e.max Press Multi provided better translucency than UTML KATANA zirconia. CONCLUSIONS: Multi layered zirconia showed higher mechanical, but lower optical properties than lithium disilicate. The multi layered zirconia showed four layers with different light transmittance capabilities. It might therefore be useful for enhancing the aesthetic appearance of full-contour zirconia restorations made from this material in stress bearing areas.
DOI：
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发表时间：
1995
期刊：
The International journal of prosthodontics.
影响因子：
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作者：
Johnston,WM;Ma,T;Kienle,BH
通讯作者：
Kienle,BH