Int J Prosthodont. 2019 Sep/Oct;32(5):439-443. doi: 10.11607/ijp.6262.
To evaluate the physical and mechanical properties of zirconia ceramic manufactured with stereolithography and to quantitatively analyze the internal and marginal adaptation of the zirconia ceramic dental crowns.
A resin-based zirconia suspension with a solid content of 45 vol% was prepared. Zirconia dental crowns (n = 5) for the maxillary right first molar were designed and manufactured. Physical and mechanical properties-including density, sintering shrinkage, flexural strength, Weibull parameters, phase composition, and microstructure-of the stereolithography-manufactured zirconia crowns were evaluated. A three-dimensional subtractive analysis technique was used to evaluate the internal and marginal adaptation.
The stereolithography-manufactured zirconia (n = 22) achieved a flexural strength of 812 ± 128 MPa and a Weibull modulus of 7.44. Quantitative analysis of the fabricated zirconia crowns showed a cement space of 63.40 ± 6.54 μm in the occlusal area, 135.08 ± 10.55 μm in the axial area, and 169.58 ± 18.13 μm in the marginal area.
Within the limits of this study, the strength of the stereolithography-manufactured zirconia was adequate for fabricating dental crowns. However, internal and marginal adaptation are not yet ideal for clinical application.
评估立体光固化成型法（SLA）制造的氧化锆陶瓷的物理和机械性能，并定量分析氧化锆陶瓷牙冠的内部和边缘适合性。
制备固含量为 45 体积%的树脂基氧化锆悬浮液。设计并制作上颌右侧第一磨牙的氧化锆牙冠（n = 5）。评估 SLA 制造的氧化锆冠的物理和机械性能，包括密度、烧结收缩率、弯曲强度、威布尔参数、相组成和微观结构。采用三维减法分析技术评估内部和边缘适合性。
SLA 制造的氧化锆（n = 22）实现了 812 ± 128 MPa 的弯曲强度和 7.44 的威布尔模数。对制作的氧化锆冠进行定量分析显示，在咬合区的粘结剂空间为 63.40 ± 6.54 μm，在轴向区为 135.08 ± 10.55 μm，在边缘区为 169.58 ± 18.13 μm。
在本研究范围内，SLA 制造的氧化锆的强度足以用于制作牙冠。然而，内部和边缘适合性尚不理想，无法直接应用于临床。
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