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Journal of Peking University (Health Sciences) ›› 2021, Vol. 53 ›› Issue (1): 54-61. doi: 10.19723/j.issn.1671-167X.2021.01.009

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In vitro evaluation of the application of digital individual tooth tray in the impression making of mandibular full-arch crown abutments

XU Xiao-xiang1,CAO Ye1,Δ(),ZHAO Yi-jiao2,JIA Lu3,XIE Qiu-fei1   

  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 for 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, Beijing 100081, China
    3. Dental Laboratory Center, 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
  • Received:2020-09-26 Online:2021-02-18 Published:2021-02-07
  • Contact: Ye CAO E-mail:ye.cao@bjmu.edu.cn
  • Supported by:
    Program for New Clinical Techniques and Therapies of Peking University School and Hospital of Stomatology(PKUSSNCT-19B14);National Natural Science Foundation of China(81800998)

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Abstract:

Objective: To establish a method for the production of digital individual tooth tray based on three-dimensional (3D) scan, computer-aided design (CAD) and 3D printing, and to evaluate the effect of impression taking of full-arch crown abutments by digital individual tooth tray technique and conventional method through in vitro study.Methods: The full crown preparation was performed on all the fourteen resin teeth in a standard model of mandibular dentition. The surface data of prepared abutments was collected by 3D scanning. A new project was created in a dental CAD software including all the fourteen teeth in the mandibular dentition. The design modules of anatomy crown and coping were selected for each tooth. The dentition was divided for three sections: right posterior teeth, anterior teeth, and left posterior teeth areas. The connector design was added between the abutments within the same section. The scanned data of the abutments were imported. The occlusal plane and insertion path were determined. The position of margin line, as well as the shape of anatomy crown and connector as the main body of the individual tooth tray were designed for each abutment. The shape of coping was generated as the space for holding the impression material. The finalized data of the main body was imported into Geomagic software. The retentive attachment was added at the external surface and the tissue stop was formed at the internal surface. The completed individual tooth tray was manufactured by 3D printing with resin material. The data of full-arch crown abutments were modified and printed. The conventional dentition trays A and B, as well as digital individual tooth tray were designed and printed for four copies each. The polyether impressions of the full-arch abutments were made by conventional one-step method using dentition tray A, and by sectional-impression technique using digital individual tooth tray and dentition tray B for four times each. The time spent for each impression taking and the numbers of defects at the shoulder and axial/occlusal surface in each impression were recorded. The impression quality of each abutment was evaluated. The overall quality distribution and the pass rate of abutments between the two methods were analyzed.Results: The impressions made by conventional method had more defects at shoulder than those made by digital individual tooth tray technique. No difference of the number of defects at axial/occlusal surface between the two methods was observed. The digital individual tooth tray technique for the full-arch abutment impression exhibited higher pass rate of abutments and better quality of impression, compared with conventional methods.Conclusion: A new method for the production of digital individual tooth tray based on digital scanning, CAD and 3D printing was established. Compared with conventional method, using digital individual tooth tray technique for impression taking of full-arch abutments can achieve better effect.

Key words: Computer-aided design, Three-dimensional printing, Prosthodontics, Dental impression technique

CLC Number: 

  • R783.6

Figure 1

Preparation of the mandibular dentition model of full-arch crown abutments A, the model of full-arch crown abutments; B, the modified digital model of full-arch crown abutments."

Figure 2

Computer aided design process of digital individual tooth tray A, the design of margin line; B, the design of anatomy crown and the connector; C, the longitudinal section after the design of coping; D, the finalization and separation of external crown and coping; E, the labial view of the anterior individual tooth tray; F, the bottom view of the anterior individual tooth tray; G, the buccal view of the posterior individual tooth tray; H, the bottom view of the posterior individual tooth tray."

Figure 3

The 3D printed full-arch abutments, digital individual tooth tray and conventional full arch individual tray A, the 3D printed full-arch abutments; B, the 3D printed digital individual tooth tray; C, the try-in of digital individual tooth tray on the abutments; D, the try-in of conventional full-arch individual tray."

Figure 4

The polyether impression of full-arch crown abutments made by conventional method and digital individual tooth tray technique A, the impression of anterior abutments made by conventional method; B, the impression of anterior abutments made by digital individual tooth tray technique; C, the impression of right posterior abutments made by conventional method; D, the impression of right posterior abutments made by digital individual tooth tray technique; E, the impression of left posterior abutments made by conventional method; F, the impression of left posterior abutments made by digital individual tooth tray technique."

Table 1

The time, number of defects and pass rate of abutments for full-arch abutment impressions made by conventional method and digital individual tooth tray technique"

Group Time/s Number of defects at shoulder Number of defects at axial/occlusal surface Pass rate of abutments
Conventional method
1 360 6 6 78.6%
2 360 7 0 85.7%
3 360 2 9 85.7%
4 360 3 8 85.7%
x-±s 360±0 4.5±2.4 5.8±4.0 83.9%±3.6%
Digital individual tooth tray technique
1 635 0 9 100.0%
2 647 1 2 100.0%
3 641 0 5 100.0%
4 643 1 6 100.0%
x-±s 642±5 0.5±0.6 5.5±2.9 100.0%±0.0%

Table 2

The quality distribution of abutments in full-arch abutment impressions made by conventional method and digital individual tooth tray technique"

Group Quality of abutments (number of units)
Excellent Good Qualified Unqualified
Conventional method 24 16 7 9
Digital individual tooth tray technique 36 18 2 0
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