摘要：
Objective:To compare the technician fabrication time and clinical working time of custom trays fabricated using two different methods,the three-dimensional printing custom trays and the conventional custom trays,and to prove the feasibility of the computer-aided design/computer-aided manufacturing (CAD/CAM) custom trays in clinical use from the perspective of clinical time cost.Methods:Twenty edentulous patients were recruited into this study,which was prospective,single blind,randomized self-control clinical trials.Two custom trays were fabricated for each participant.One of the custom trays was fabricated using functional suitable denture (FSD) system through CAD/CAM process,and the other was manually fabricated using conventional methods.Then the final impressions were taken using both the custom trays,followed by utilizing the final impression to fabricate complete dentures respectively.The technician production time of the custom trays and the clinical working time of taking the final impression was recorded.Results:The average time spent on fabricating the three-dimensional printing custom trays using FSD system and fabricating the conventional custom trays manually were (28.6 ± 2.9)min and (31.1 ± 5.7) min,respectively.The average time spent on making the final impression with the three-dimensional printing custom trays using FSD system and the conventional custom trays fabricated manually were (23.4 ± 11.5) min and (25.4 ± 13.0) min,respectively.There was significant difference in the technician fabrication time and the clinical working time between the three-dimensional printing custom trays using FSD system and the conventional custom trays fabricated manually (P ＜ 0.05).Conclusion:The average time spent on fabricating three-dimensional printing custom trays using FSD system and making the final impression with the trays are less than those of the conventional custom trays fabricated manually,which reveals that the FSD three-dimensional printing custom trays is less timeconsuming both in the clinical and laboratory process than the conventional custom trays.In addition,when we manufacture custom trays by three-dimensional printing method,there is no need to pour preliminary cast after taking the primary impression,therefore,it can save the impression material and model material.As to completing denture restoration,manufacturing custom trays using FSD system is worth being popularized.%目的:比较三维打印数字化无牙颌个别托盘与传统无牙颌个别托盘的技工制作用时及临床操作用时,从临床时间花费角度对数字化个别托盘进行适用性验证.方法:招募20名无牙颌患者进行前瞻性、单盲、自身随机对照临床试验,每人均采用北京大学口腔医院功能易适性数字化全口义齿(functional suitable denture,FSD)系统修复方式及传统全口义齿修复方式制作无牙颌个别托盘,将利用两种方式制作的个别托盘制取终印模后制作全口义齿,记录技工制作用时及临床操作用时.结果:三维打印数字化无牙颌个别托盘与传统无牙颌个别托盘的制作平均人工用时分别为(28.6±2.9) min、(31.1±5.7)min,两者差异有统计学意义(P＜0.05).分别用三维打印数字化无牙颌个别托盘与传统无牙颌个别托盘制取终印模的临床操作平均用时为(23.4 ±11.5) min、(25.4±13.0)min,两者差异有统计学意义(P＜0.05).结论:三维打印数字化无牙颌个别托盘的技工制作用时及临床操作用时均小于传统无牙颌个别托盘,采用三维打印数字化无牙颌个别托盘制作全口义齿能够节约技工的制作时间及临床操作用时,且由于其不需要灌注初印模,可节省印模材料及模型材料,在全口义齿修复治疗中,是值得临床推广的制作无牙颌个别托盘的方式.
