Sae-Eun Oh , Ji-Man Park , Jee-Hwan Kim , June-Sung Shim , Young-Bum Park
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引用次数: 0
摘要
目的我们评估了通过增材制造(AM)技术生产的氧化锆修复体的机械性能以及氧化锆牙冠的精度:方法:采用减法(CNC 组)和增材制造(AM 组)技术制造氧化锆盘、棒和冠。使用 X 射线衍射仪分析试样的相。弯曲强度通过双轴弯曲试验进行测量。使用扫描电子显微镜检查了形态。通过线性混合模型和皮尔逊相关分析,分析了各组中 m 相组分和双轴抗弯强度与高压釜时间的相关性。使用复制技术对每组牙冠试样的边缘和内部间隙进行评估。测量颊舌侧和牙间侧横截面,并进行重复测量单因素方差分析:线性混合模型分析表明,随着高压灭菌时间的延长,两组牙体的抗折强度都有所下降,而 m 相分数则有所上升。皮尔逊相关分析表明,两组的 m 相分数与抗折强度之间没有相关性。对器械切片(颊侧、舌侧、中侧和远侧)进行了重复测量单因素方差分析,结果显示 AM 生产的氧化锆冠的边缘间隙和内部间隙的精确度低于 CNC 生产的氧化锆冠:这些研究结果表明,添加剂生产的氧化锆修复体的机械性能与传统生产的陶瓷相当,可能适合临床应用。
Mechanical properties and crown accuracy of additively manufactured zirconia restorations
Objectives
We evaluated the mechanical properties of zirconia restorations produced via additive manufacturing (AM) and the crown accuracy of zirconia crowns.
Methods
Zirconia disks, bars, and crowns were manufactured via subtractive (CNC group) and additive manufacturing (AM group) techniques. Disk-shaped specimens in each group were autoclaved at 134 °C and 216 kPa for 5, 10, and 24 h. The phases of the specimens were analyzed using an X-ray diffractometer. The flexural strengths were measured via biaxial flexural tests. The morphologies were examined using a scanning electron microscope. The correlation between the m-phase fraction and biaxial flexural strength by autoclave time in each group was analyzed via linear mixed model and Pearson’s correlation analysis. For each group, crown specimens were used to assess the marginal and internal gaps using the replica technique. Buccolingual and mesiodistal cross-sections were measured, and a repeated measures one-way ANOVA was performed.
Results
Linear mixed model analysis indicated that for both groups, with an increase in the autoclave time, the flexural strength decreased, whereas the m-phase fraction increased. Pearson’s correlation analysis revealed no correlation between the m-phase fraction and flexural strength for either group. A repeated measures one-way ANOVA was conducted on instrumented sections (buccal, lingual, mesial, and distal), revealing that the marginal and internal gaps of AM-produced zirconia crowns were less accurate than those of CNC-produced zirconia crowns.
Significance
These findings suggest that additively produced zirconia restorations have mechanical properties comparable to those of conventionally produced ceramics and may be suitable for clinical applications.
期刊介绍:
Dental Materials publishes original research, review articles, and short communications.
Academy of Dental Materials members click here to register for free access to Dental Materials online.
The principal aim of Dental Materials is to promote rapid communication of scientific information between academia, industry, and the dental practitioner. Original Manuscripts on clinical and laboratory research of basic and applied character which focus on the properties or performance of dental materials or the reaction of host tissues to materials are given priority publication. Other acceptable topics include application technology in clinical dentistry and dental laboratory technology.
Comprehensive reviews and editorial commentaries on pertinent subjects will be considered.