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Journal of Peking University(Health Sciences) ›› 2019, Vol. 51 ›› Issue (2): 349-355. doi: 10.19723/j.issn.1671-167X.2019.02.028

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Establishment and preliminary clinical evaluation of edentulous custom trays designed and fabricated by chair-side CAD and 3D printing systems

Kuan-paul WANG1,Hong-qiang YE1,Hu CHEN2,Yong WANG2,Yu-chun SUN2,∆(),Yong-sheng ZHOU1,∆()   

  1. 1. Department of Prosthodontics, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology, Beijing 100081, China;
    2. Center of Digital Dentistry, Peking University School and Hospital of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology & Beijing Key Laboratory of Digital Stomatology,Research Center of Engineering and Technology for Digital Dentistry, Ministry of Health, Beijing 100081, China;
  • Received:2017-06-12 Online:2019-04-18 Published:2019-04-26
  • Contact: Yu-chun SUN,Yong-sheng ZHOU E-mail:polarshining@163.com;kqzhouysh@hsc.pku.edu.cn
  • Supported by:
    the Capital’s Funds for Health Improvement and Research(2016-1-4101);the Project for Culturing Leading Talents in Scientific and Technological Innovation of Beijing(Z171100001117169)

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Abstract:

Objective: To design and fabricate edentulous custom trays by chair-side computer-aided design and 3-dimensional printing (CAD/3DP) system of independent research and development and to evaluate their clinical effects based on prosthodontists’ satisfaction using the visual analogue scale (VAS).Methods: Fifteen edentulous patients were randomly recruited by three prosthodontists who passed the unified operating process training. The custom trays for each patient were fabricated using both chair-side CAD/3DP system of independent development and manually conventional method, and the final impressions were made by silicone impression materials (light body). The prosthodontist’s satisfaction was surveyed by the three prosthodontists via the questionnaire based on visual analogue scales.Results: In the degree of the prosthodontist’s satisfaction of final impressions, the average satisfactions of “try in” (the overall size, shape, convenience, etc.) on the 3DP custom tray made by independent development chair-side system and the manually conventional method were 9.18±0.19 and 8.23±0.22, respectively. The average satisfactions of the border line position (border extensions, frenal notch)were 8.91±0.40 and 7.96±0.23, respectively. The average satisfactions of the stability in border molding were 8.80±0.83 and 8.01±0.81, respectively. The average satisfactions of the quality of final impression (completeness, thickness of impression material, exposure of custom tray, shape of border) were 8.94±0.68 and 7.99±0.42, respectively. The average satisfactions of the difficulty of high quality impression (times of repetition, efficiency) were 9.20±0.37 and 7.88±0.22, respectively. The average satisfactions of the overall satisfaction were 9.11±0.49 and 7.95±0.15, respectively. There was signi-ficant difference in the satisfaction of “try in”, border line position, stability in border molding, quality of final impression, difficulty of high quality impression, and overall satisfaction between the 3DP custom tray made by chair-side system of independent development and the manually conventional method (P<0.05).Conclusion: In the degree of the prosthodontist’s satisfaction of final impression, the 3DP custom tray made by chair-side system of independent development is higher than that of the conventional custom tray, and it meets the clinical requirements and can be popularized in clinical application.

Key words: Denture, complete, Computer-aided design, Printing, three-dimensional, Custom trays

CLC Number: 

  • R783.6

Figure 1

The scanning data of mandibular primary impression A, chair-side CAD/3DP system of independent development for edentulous custom trays; B, mandibular primary impression; C, scanned data of mandibular primary impression."

Figure 2

Computer-aided design process of mandibular custom tray A, confirmation of border line; B, impression data was trimmed according to the border line and normal direction was flipped; C, filling undercut, which was marked with purple; D, selecting the buffering area (red region); E, setting the thickness of custom tray and impression space; F, adding a handle (bend handle); G, adding finger stops; H, adding tissue stops; I, drilling some vent holes on necessary regions."

Figure 3

Three-dimensional printed mandibular custom tray printed by independently developed FDM printer A, printing mandibular custom tray; B, tissue surface of three-dimensional printed mandibular custom tray."

Figure 4

Final impression was made by silicone rubber (light body)"

Table 1

Prosthodontists’ satisfaction for final impressions of two custom trays (x?±s)"

Items Independent development custom tray
chair-side CAD/3DP system		 Conventional method t P value
“Try in” (the overall size, shape, convenience, etc.) 9.18±0.19 8.23±0.22 16.660 &lt;0.01
Border line position (border extensions, frenal notch) 8.91±0.40 7.96±0.23 9.856 &lt;0.01
Stability in border molding 8.80±0.83 8.01±0.81 5.320 &lt;0.01
Quality of final impression (completeness, thickness of impression
material, exposure of custom tray, shape of border)		 8.94±0.68 7.99±0.42 6.721 &lt;0.01
Difficulty of high quality impression (times of repetition, efficiency) 9.20±0.37 7.88±0.22 12.988 &lt;0.01
Overall satisfaction 9.11±0.49 7.95±0.15 8.750 &lt;0.01
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