Chinese Journal of Tissue Engineering Research ›› 2020, Vol. 24 ›› Issue (4): 544-548.doi: 10.3969/j.issn.2095-4344.2208

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Application of intraoral scanning and 3D printing in the manufacture of removable partial dentures

Su Tingshu1, Tang Ying2, Sun Jian1   

  1. 1Shanghai Ninth People’s Hospital, Shanghai JiaoTong University School of Medicine, Shanghai 200011, China; 2Shanghai Municipal Hospital of Stomatology, Shanghai 200031, China
  • Received:2019-03-14 Revised:2019-03-22 Accepted:2019-05-23 Online:2020-02-08 Published:2019-12-31
  • Contact: Sun Jian, MD, Chief physician, Shanghai Ninth People’s Hospital, Shanghai JiaoTong University School of Medicine, Shanghai 200011, China
  • About author:Su Tingshu, Master, Attending physician, Shanghai Ninth People’s Hospital, Shanghai JiaoTong University School of Medicine, Shanghai 200011, China
  • Supported by:
    "Cross" Project Cooperation Fund of Shanghai Ninth People’s Hospital, Shanghai JiaoTong University School of Medicine, No. JYJC201812; the Natural Science Foundation of Xinjiang Uygur Autonomous Region, No. 2016D01C096

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Abstract:

BACKGROUND: There is no mature computer-aided design and manufacturing system for the preparation of removable partial denture in China so far. There is no report involving large sample size. Most of the existing studies only investigated the wear effect of a few cases, and there is a need to accumulate and enrich clinical data.

OBJECTIVE: To explore the application value of intraoral scanning and 3D printing in the manufacture of removable partial dentures for patients.

METHODS: Sixty-three patients with Kennedy class I dentition defect who received treatment in the Shanghai Ninth People’s Hospital, Shanghai JiaoTong University School of Medicine, China were included in this study. These patients consisted of 29 males and 34 females and were aged 44-63 years. In the study group, 23 patients were treated with denture scaffolds by intraoral scanning and three-dimensional printing, while in the control group, 40 patients were treated with denture scaffolds by traditional impression. The wear effect was compared between two groups after repair. The masticatory efficiency was compared between two groups before and 6, 12 and 24 months after repair. At the last follow-up, patients' satisfaction and complications were compared between the study and control groups. This study was approved by Shanghai Ninth People’s Hospital, Shanghai JiaoTong University School of Medicine (approval No. TJBDYY-2014-13-R1) in March, 2014.

RESULTS AND CONCLUSION: The fitness (96% vs. 70%), retention (83% vs. 58%) and stability index (83% vs. 53%) of the study group were significantly higher than those of the control group (all P < 0.05). There was no significant difference in masticatory efficiency between before and 6 months after repair (P > 0.05). At 12 and 24 months after repair, the masticatory efficiency in the study group was significantly higher than that in the control group (P < 0.05). Patients' comfort satisfaction in the study group was significantly higher than that in the control group (82% vs. 50%, P < 0.05). There were no significant differences in aesthetic appearance (70% vs. 53%) and pronunciation function satisfaction (65% vs. 40%) between study and control groups. During the follow-up, there were no statistically significant differences in the incidences of periodontal disease (0 vs. 5%), denture stomatitis (4% vs. 5%) and secondary caries (9% vs. 18%) between groups (P > 0.05). These results suggest that intraoral scanning and 3D printing could obtain a more accurate stent model in the manufacture of partial dentures compared with traditional impression, thereby has a higher application value.

Key words: intraoral scanning, 3D printing, removable partial denture, complication, masticatory efficiency, satisfaction, pronunciation, stability 

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