Department of Prosthodontics, Bolu Abant Izzet Baysal University, Faculty of Dentistry, Bolu, Turkey.
J Esthet Restor Dent. 2020 Sep;32(6):607-614. doi: 10.1111/jerd.12598. Epub 2020 May 23.
The objective of the present research was to evaluate the effect of sintering temperatures (1350°C, 1450°C, and 1600°C) of a novel multi-layered esthetic zirconia material (Katana 12Z/STML) on the grain sizes and on the translucency parameters (TP ) for 2 different shades (A2-A3) and 2 different thicknesses (1-1.5 mm).
A total of 120 non-sintered specimens were randomly divided into three subgroups according to sintering temperatures. The TP and grain sizes of the sintered specimens were calculated. Statistical analyses were performed using 3-way ANOVA, 1-way ANOVA, and Tukey's post hoc tests.
TP increased 1.2 to 1.5 times as the specimen thickness decreased from 1.5 to 1 mm (P ≤ .05). The lowest TP values were recorded for sintering at 1350°C for the investigated thicknesses and shades (P ≤ .05). The interaction of sintering temperature and shade was significant (P ≤ .05). Grain sizes were ordered according to sintering temperature as 1350°C < 1450°C < 1600°C (P ≤ .05).
TP values decreased with the increase in the thickness of the monolithic zirconia. The sintering temperatures and their interaction with shade significantly affected TP values. The grain size increased with increasing sintering temperature.
The translucency of a novel multi-layered monolithic zirconia increased with higher sintering temperatures and lower thickness. The grain size increased with the increase in the sintering temperature. The sintering temperature of 1600°C led to a significant change in translucency for shade A3.
本研究旨在评估新型多层美学氧化锆材料（Katana 12Z/STML）的烧结温度（1350°C、1450°C 和 1600°C）对晶粒尺寸和两种不同色调（A2-A3）和两种不同厚度（1-1.5mm）的透光率参数（TP）的影响。
共制备 120 个未烧结试件，随机分为三组，根据烧结温度进行分组。计算烧结试件的 TP 和晶粒尺寸。采用三因素方差分析、单因素方差分析和 Tukey 事后检验进行统计学分析。
当试件厚度从 1.5mm 降至 1mm 时，TP 增加了 1.2 到 1.5 倍（P≤0.05）。在所研究的厚度和色调下，1350°C 烧结的 TP 值最低（P≤0.05）。烧结温度和色调的相互作用具有统计学意义（P≤0.05）。晶粒尺寸按烧结温度顺序排列为 1350°C<1450°C<1600°C（P≤0.05）。
随着氧化锆整体厚度的增加，TP 值降低。烧结温度及其与色调的相互作用显著影响 TP 值。晶粒尺寸随烧结温度的升高而增加。
新型多层整体氧化锆的透光性随烧结温度升高和厚度降低而增加。晶粒尺寸随烧结温度的升高而增大。1600°C 的烧结温度导致 A3 色调的透光率发生显著变化。
