Gul Buse Cebi, Demirci Fatih, Baki Nagehan, Bahce Erkan, Özcan Mutlu
Department of Prosthodontics, Faculty of Dentistry of Inonu University, Malatya, 44280, Turkey.
Department of Mechanical Engineer, Faculty of Engineering, of Inonu University, Malatya, Turkey.
BMC Oral Health. 2025 Jan 24;25(1):131. doi: 10.1186/s12903-024-05384-2.
The aim of this study was to compare the wear and fracture resistance of single crowns produced from newly developed 3D printer resins used to produce permanent crowns and currently used composite CAD/CAM discs, after being thermomechanically aged in a chewing simulator.
A total of 112 stainless steel die models simulating mandibular left first molars were produced, 8 for each group. Single crowns were produced from 3 different discs (Grandio Voco [GR], breCAM HIPC [HC], and Shofu HC [SF]) by CAD/CAM milling method and manufactured from from 4 different permanent composite resins (Nexdent C&B MFH [ND], Permanent Bridge Saremco [PB], VarseoSmile Crownplus [VSC], and Şenertek P-Crown [PC]) using the 3D printing method. Stereomicroscopy, scanning electron microscope (SEM) and Finite Element Method (FEM) analysis was performed. Data were analyzed using ANOVA, paired-t tests and Tukey's HSD test (alpha = 0.05).
As a result of thermomechanical aging, significant difference was found between the groups in wear and fracture resistance (P < .05). The highest wear resistance was found in the VSC group, and the lowest wear resistance in the PC group. As a result of the compression test, the highest fracture resistance was noted in the GR group and the lowest in the PC group. FEM analysis performed to validate fracture experiments showed an 87% similarity to the in-vitro data.
The crowns in all groups produced by CAD/CAM milling and 3D printing provided acceptable in vitro wear and fracture resistance for clinical application. The wear and fracture resistance of resin-based materials should be supported by clinical studies.
本研究旨在比较用于制作永久冠的新开发3D打印树脂制成的单冠与目前使用的复合CAD/CAM牙盘在咀嚼模拟器中进行热机械老化后的耐磨性和抗折性。
共制作了112个模拟下颌左侧第一磨牙的不锈钢模具模型，每组8个。通过CAD/CAM铣削方法用3种不同的牙盘（Grandio Voco [GR]、breCAM HIPC [HC]和Shofu HC [SF]）制作单冠，并使用3D打印方法由4种不同的永久性复合树脂（Nexdent C&B MFH [ND]、Permanent Bridge Saremco [PB]、VarseoSmile Crownplus [VSC]和Şenertek P-Crown [PC]）制作。进行了立体显微镜检查、扫描电子显微镜（SEM）和有限元方法（FEM）分析。使用方差分析、配对t检验和Tukey's HSD检验（α = 0.05）对数据进行分析。
热机械老化的结果显示，各组在耐磨性和抗折性方面存在显著差异（P < 0.05）。VSC组的耐磨性最高，PC组的耐磨性最低。压缩试验的结果表明，GR组的抗折性最高，PC组的最低。为验证断裂实验而进行的FEM分析显示与体外数据的相似度为87%。
通过CAD/CAM铣削和3D打印制作的所有组的牙冠在体外均具有可接受的耐磨性和抗折性，可用于临床应用。基于树脂材料的耐磨性和抗折性应通过临床研究来支持。
