Advances in Assistive Technology: A Systematic Review of 3D-Printed Hand Prostheses ^†

Introduction: The application of 3D printing in the development of hand prostheses offers customized, low-cost solutions with high functional potential for the field of assistive technology. This study aimed to identify the types of 3D-printed prostheses described in the analyzed studies and to evaluate the impact of their use on the quality of life of users, focusing on their applicability in daily tasks. Methodology: A systematic literature review was conducted in the PubMed and PubMed Central (PMC) databases, covering 20 articles published between 2020 and 2025. Data were extracted and organized into electronic spreadsheets, allowing for the categorization and analysis of prosthetic models and their functional performance. Results: The analysis of prosthesis types indicated a growing trend in the development of myoelectric and bionic models, with a notable incorporation of sensors and intelligent systems since 2023. In contrast, the evaluation of use showed that the Pinch grip was the most effective across different difficulty levels. The studies also indicated that the customization provided by 3D printing increases user acceptance and comfort, positively impacting rehabilitation. Conclusions: 3D-printed hand prostheses represent a convergence of accessibility, innovation, and functionality. The results reinforce that, in addition to being economically viable, these devices promote significant gains in autonomy and quality of life, making it essential to strengthen scientific collaboration and research to expand their benefits in clinical practice.