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Journal of Peking University (Health Sciences) ›› 2023, Vol. 55 ›› Issue (3): 548-552. doi: 10.19723/j.issn.1671-167X.2023.03.023

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Three-dimensional finite element analysis of cement flow in abutment margin-crown platform switching

Meng-en OU1,Yun DING1,Wei-feng TANG1,Yong-sheng ZHOU2,*()   

  1. 1. Third Clinical Division, Peking University School and Hospital of Stomatology & National Center for Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Research Center of Oral Biomaterials and Digital Medical Devices & Beijing Key Laboratory of Digital Stomatology, Beijing 100083, China
    2. Department of Prosthodontics, Peking University School and Hospital of Stomatology, Bejing 100081, China
  • Received:2021-04-23 Online:2023-06-18 Published:2023-06-12
  • Contact: Yong-sheng ZHOU E-mail:kqzhouysh@hsc.pku.edu.cn
  • Supported by:
    the Program for New Clinical Techniques and Therapies of Peking University School and Hospital of Stomatology(PKUSSNCT-19B10);the National Program for Multidisciplinary Cooperative Treatment on Major Diseases(PKUSSNMP-201901)

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Abstract:

Objective: To analyze the cement flow in the abutment margin-crown platform switching structure by using the three-dimensional finite element analysis, in order to prove that whether the abutment margin-crown platform switching structure can reduce the inflow depth of cement in the implantation adhesive retention. Methods: By using ANSYS 19.0 software, two models were created, including the one with regular margin and crown (Model one, the traditional group), and the other one with abutment margin-crown platform switching structure (Model two, the platform switching group). Both abutments of the two models were wrapped by gingiva, and the depth of the abutment margins was 1.5 mm submucosal. Two-way fluid structure coupling calculations were produced in two models by using ANSYS 19.0 software. In the two models, the same amount of cement were put between the inner side of the crowns and the abutments. The process of cementing the crown to the abutment was simulated when the crown was 0.6 mm above the abutment. The crown was falling at a constant speed in the whole process spending 0.1 s. Then we observed the cement flow outside the crowns at the time of 0.025 s, 0.05 s, 0.075 s, 0.1 s, and measured the depth of cement over the margins at the time of 0.1 s. Results: At the time of 0 s, 0.025 s, 0.05 s, the cements in the two models were all above the abutment margins. At the time of 0.075 s, in Model one, the gingiva was squeezed by the cement and became deformed, and then a gap was formed between the gingiva and the abutment into which the cement started to flow. In Model two, because of the narrow neck of the crown, the cement flowed out from the gingival as it was pressed by the upward counterforce from the gingival and the abutment margin. At the time of 0.1 s, in Model one, the cement continued to flow deep inside with the gravity force and pressure, and the depth of the cement over the margin was 1 mm. In Model two, the cement continued to flow out from the gingival at the time of 0.075 s, and the depth of the cement over the margin was 0 mm. Conclusion: When the abutment was wrapped by the gingiva, the inflow depth of cement in the implantation adhesive retention can be reduced in the abutment margin-crown platform switching structure.

Key words: Abutment margin-crown, Platform switching, Dental implantation, Dental prosthesis retention, Three-dimensional finite element analysis

CLC Number: 

  • R783.6

Figure 1

Structural image of reverse margin"

Figure 2

Structural images of abutment-crown-gingival models (the purple part: abutment; the green part: crown; the blue part: gingival) A, Model one (the traditional group); B, Model two (the platform switching group). The angle between the abutment shaft wall and perpendicular line is 3°."

Figure 3

Structural images of crown-abutment-gingival-cement models A, Model one (the traditional group); B, Model two (the platform switching group)."

Figure 4

The meshes of crown- abutment-gingival-cement models A, Model one (the traditional group); B, Model two (the platform switching group)."

Figure 5

The volume of fluid (VOF) images of cement flow in different seating time of crown"

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