Department of Orthodontics and Dentofacial Orthopedics, Heidelberg University Hospital, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany.
Department of Oral and Maxillofacial Surgery, Heidelberg University Hospital, Im Neuenheimer Feld 400, 69120, Heidelberg, Germany.
Clin Oral Investig. 2022 Dec;26(12):7149-7155. doi: 10.1007/s00784-022-04676-7. Epub 2022 Aug 18.
To investigate whether artificial CAD/CAM processed (computer-aided design/manufacturing) teeth could be a feasible option for the production of dental in vitro models for biomechanical testing.
Disks (n = 10 per group) made from two different CAD/CAM-materials, one fiber-reinforced composite (FRC; Trinia, Bicon) and one polymethylmethacrylate-based resin (PMMA; Telio CAD, Ivoclar Vivadent), as well as bovine teeth (n = 10), were tested for their shear bond strength (SBS) and scored according to the adhesive remnant index (ARI). In addition, CAD/CAM-manufactured lower incisor teeth were tested for their ultimate load (F).
With regard to SBS, both PMMA (17.4 ± 2.2 MPa) and FRC (18.0 ± 2.4 MPa) disks showed no significant difference (p = 0.968) compared to bovine disks (18.0 ± 5.4 MPa). However, the samples differed with regard to their failure mode (PMMA: ARI 4, delamination failure; FRC: ARI 0 and bovine: ARI 1.6, both adhesive failure). With regard to F, FRC-based teeth could withstand significantly higher loads (708 ± 126 N) than PMMA-based teeth (345 ± 109 N) (p < 0.01).
Unlike PMMA-based teeth, teeth made from FRC showed sufficiently high fracture resistance and comparable SBS. Thus, FRC teeth could be a promising alternative for the production of dental in vitro models for orthodontic testing.
CAD/CAM-processed teeth made from FRC enable the use of standardized geometry and constant material properties. Using FRC teeth in dental in vitro studies has therefore the potential to identify differences between various treatment options with rather small sample sizes, while remaining close to the clinical situation.
研究人工 CAD/CAM 加工（计算机辅助设计/制造）的牙齿是否可为生物力学测试的牙体模型制作提供一种可行的选择。
将两种不同 CAD/CAM 材料（纤维增强复合材料 [FRC]；Trinia，Bicon 和聚甲基丙烯酸甲酯基树脂 [PMMA]；Telio CAD，Ivoclar Vivadent）制成的各 10 个圆盘（每组 10 个）和牛牙（n = 10）进行剪切结合强度（SBS）测试，并根据黏附残余指数（ARI）进行评分。此外，还对 CAD/CAM 加工的下颌切牙进行了极限载荷（F）测试。
就 SBS 而言，PMMA（17.4 ± 2.2 MPa）和 FRC（18.0 ± 2.4 MPa）圆盘与牛牙（18.0 ± 5.4 MPa）相比，均无显著差异（p = 0.968）。然而，这些样本的破坏模式不同（PMMA：ARI 4，分层破坏；FRC：ARI 0 和牛牙：ARI 1.6，均为黏附破坏）。至于 F，基于 FRC 的牙齿能够承受的负荷明显更高（708 ± 126 N），而基于 PMMA 的牙齿则只能承受 345 ± 109 N（p < 0.01）。
与基于 PMMA 的牙齿不同，基于 FRC 的牙齿具有足够高的抗断裂能力和相当的 SBS。因此，FRC 牙齿可为正畸测试的牙体模型制作提供一种有前景的替代方法。
基于 FRC 的 CAD/CAM 加工的牙齿可实现标准化的几何形状和恒定的材料性能。因此，在牙体体外研究中使用 FRC 牙齿，具有在接近临床实际情况的同时，用相对较小的样本量来识别各种治疗方案之间差异的潜力。
