Mohamed Amr, Takaichi Atsushi, Kajima Yuka, Takahashi Hidekazu, Wakabayashi Noriyuki
Advanced Prosthodontics, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-Ku, Tokyo 113-8549, Japan.
Course for Oral Health Engineering, Faculty of Dentistry, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-Ku, Tokyo 113-8549, Japan.
Polymers (Basel). 2023 Apr 29;15(9):2134. doi: 10.3390/polym15092134.
Additive manufacturing is an emerging technology that has been successfully used in dentistry for denture fabrication. However, the conventional issue of tooth debonding exists in additively manufactured dentures. In this study, we investigated the physical properties of conventional teeth attached to a heat-cured denture base material compared to additively manufactured tooth-coloured materials attached to denture base-coloured materials in a printed monolithic unit. We designed a model consisting of a tooth attached to a cylindrical base to fabricate the additively manufactured group and the conventional group. All groups were tested for fracture load before and after thermocycling, water sorption, solubility, and shape accuracy. The Mann-Whitney U test was used for statistical analysis. The fracture load of the additively manufactured group was significantly higher than that of the conventional group after thermocycling ( = 0.019). The water sorption of the conventional group was significantly lower than that of the additively manufactured group ( = 0.000), whereas there was no significant difference in the water solubility between them ( = 0.192). The shape accuracy of the additively manufactured group was significantly better than that of the conventional group ( < 0.05). In conclusion, additive monolithic manufacturing technology may provide an alternative way to enhance the fracture load between the teeth and denture bases.
增材制造是一项新兴技术，已成功应用于牙科领域制作假牙。然而，增材制造的假牙存在传统的牙齿脱粘问题。在本研究中，我们调查了附着于热固化义齿基托材料的传统牙齿的物理性能，并将其与在打印的整体单元中附着于义齿基托颜色材料的增材制造牙齿颜色材料进行了比较。我们设计了一个模型，该模型由附着在圆柱形基座上的牙齿组成，用于制造增材制造组和传统组。对所有组在热循环前后进行断裂载荷、吸水性、溶解性和形状精度测试。采用曼-惠特尼U检验进行统计分析。热循环后，增材制造组的断裂载荷显著高于传统组（P = 0.019）。传统组的吸水性显著低于增材制造组（P = 0.000），而它们之间的水溶性无显著差异（P = 0.192）。增材制造组的形状精度显著优于传统组（P < 0.05）。总之，增材整体制造技术可能提供一种增强牙齿与义齿基托之间断裂载荷的替代方法。
