Sumita Yuka, Elbashti Mahmoud E, Tani Hiroko, Mano Yusuke, Hattori Mariko, Wakabayashi Noriyuki
Department of Partial and Complete Denture, The Nippon Dental University School of Life Dentistry at Tokyo, Tokyo, JPN.
Department of Advanced Prosthodontics, Institute of Science Tokyo, Tokyo, JPN.
Cureus. 2025 Jun 5;17(6):e85393. doi: 10.7759/cureus.85393. eCollection 2025 Jun.
The effective use of a patient's existing prosthesis can be an alternative to creating a new prosthesis and is faster, simpler, and less stressful for clinicians and patients. This report describes three minimally burdensome protocols for refabricating a maxillofacial prosthesis already in use. It also explains how to use the impression of the existing prosthesis to create a new one. Three protocols were introduced to refabricate a new prosthesis skipping the step of preliminary impression: (1) a putty impression protocol, where an impression of the intaglio surface of the existing prosthesis was made using heavy body polyvinyl siloxane impression material and prepared as a working cast; (2) an irreversible hydrocolloid impression protocol, where an impression of the surface of the existing prosthesis was made using hydrocolloid impression material and a duplicating flask; and (3) a digitized protocol, where an intraoral scanner was used to duplicate the existing maxillary prosthesis and print it using a 3D printer. All three protocols can help effectively skip the step of preliminary impression using a stock tray. The benefits include the avoidance of chair time in the preliminary impression step. Also, the custom tray or the copy denture made from the impression of the existing prosthesis is helpful because it reflects the morphology of a prosthesis that has been adjusted in multiple steps over a long period. These protocols can be used for both maxillofacial prostheses and complete dentures.
有效利用患者现有的假体可以替代制作新的假体，并且对临床医生和患者来说更快、更简单，压力也更小。本报告描述了三种用于重新制作已在使用的颌面假体的微创方案。它还解释了如何利用现有假体的印模来制作新的假体。引入了三种跳过初步印模步骤来重新制作新假体的方案：（1）一种油泥印模方案，即使用重体聚乙烯基硅氧烷印模材料对现有假体的凹面进行印模，并制作成工作模型；（2）一种不可逆水胶体印模方案，即使用水胶体印模材料和复制型盒对现有假体的表面进行印模；（3）一种数字化方案，即使用口腔内扫描仪复制现有的上颌假体，并使用3D打印机进行打印。所有这三种方案都可以有效地跳过使用成品托盘进行初步印模的步骤。好处包括避免了初步印模步骤中的就诊时间。此外，由现有假体的印模制成的定制托盘或复制义齿很有用，因为它反映了经过长期多步骤调整的假体的形态。这些方案可用于颌面假体和全口义齿。
