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Translucent zirconia in the ceramic scenario for monolithic restorations: A Flexural Strength and Translucency comparison test

机译:用于整体修复的陶瓷场景中的半透明氧化锆:弯曲强度和半透明度对比测试

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摘要

Objective: To compare three different compositions of Yttria-Tetragonal Zirconia Polycrystal (Y-TZP) ceramic and a lithium disilicate ceramic in terms of flexural strength and translucency. Methods: Three zirconia materials of different composition and translucency, Aadva ST [ST], Aadva EI [EI] and Aadva NT [NT](GC Tech, Leuven, Belgium) were cut with a slow speed diamond saw into beams and tabs in order to obtain, after sintering, dimensions of 1.2 × 4.0 × 15.0 mm and 15.0 × 15.0 × 1.0 mm respectively. Blocks of IPS e.max CAD LT were cut and crystallized in the same shapes and dimensions and used as a reference group [LD]. Beams (n = 15) were tested in a universal testing machine for three-point bending strength. Critical fracture load was recorded in N, flexural strength (σ in MPa), Weibull modulus (m) and Weibull characteristic strength (σ0 in MPa) were then calculated. Tabs (n = 10) were measured with a spectrophotometer equipped with an integrating sphere. Contrast Ratios were calculated as CR = Yb/Yw. SEM of thermally etched samples coupled with lineal line analysis (n = 6) was used to measure the tested zirconia grain size. Data were statistically analyzed. Results: Differences in translucency, flexural strength and grain size were found to be statistically significant. CR increased and flexural strength decreased in the following order ST(σ 1215 ± 190 MPa, CR 0.74 ± 0.01) > EI(σ 983 ± 182 MPa, CR 0.69 ± 0.01) > NT(σ 539 ± 66 MPa, CR 0.65 ± 0.01) > LD (σ 377 ± 39 Mpa, CR 0.56 ± 0.02). The average grain size was different for the three zirconia samples with NT(558 ± 38 nm) > ST(445 ± 34 nm) > EI(284 ± 11 nm). Conclusions: The zirconia composition heavily influenced both the flexural strength and the translucency. Different percentages of Yittria and Alumina result in new materials with intermediate properties in between the conventional zirconia and lithium disilicate. Clinical indications for Zirconia Aadva NT should be limited up to three-unit span bridges.
机译:目的:比较Yttria-四方氧化锆多晶(Y-TZP)陶瓷和二硅酸锂陶瓷的三种不同成分的弯曲强度和半透明性。方法:用慢速金刚石锯将三种不同组成和半透明的氧化锆材料Aadva ST [ST],Aadva EI [EI]和Aadva NT [NT](GC Tech,Leuven,Belgium)切割成条状和片状。烧结后得到的尺寸分别为1.2×4.0×15.0 mm和15.0×15.0×1.0 mm。将IPS e.max CAD LT块切割并结晶成相同的形状和尺寸,并用作参考组[LD]。在万能试验机中对梁(n = 15)进行了三点弯曲强度测试。将临界断裂载荷记录为N,然后计算抗弯强度(以MPa为单位的σ),威布尔模量(m)和威布尔特征强度(以MPa为单位的σ0)。用配备有积分球的分光光度计测量接片(n = 10)。对比度的计算公式为CR = Yb / Yw。热蚀刻样品的SEM与线形分析(n = 6)一起用于测量测试的氧化锆晶粒尺寸。对数据进行统计分析。结果:发现透明度,抗弯强度和晶粒尺寸的差异具有统计学意义。 CR按以下顺序增加而弯曲强度降低ST(σ1215±190 MPa,CR 0.74±0.01)> EI(σ983±182 MPa,CR 0.69±0.01)> NT(σ539±66 MPa,CR 0.65±0.01 )> LD(σ377±39 Mpa,CR 0.56±0.02)。这三个氧化锆样品的平均晶粒尺寸不同,NT(558±38 nm)> ST(445±34 nm)> EI(284±11 nm)。结论:氧化锆成分严重影响了弯曲强度和半透明性。不同百分比的氧化钇和氧化铝导致新材料具有介于常规氧化锆和二硅酸锂之间的中间性能。氧化锆Aadva NT的临床适应症应限制在三单元跨桥上。

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