Chinese Journal of Tissue Engineering Research ›› 2018, Vol. 22 ›› Issue (26): 4123-4127.doi: 10.3969/j.issn.2095-4344.0894

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Three-dimensional finite element analysis of splinted crown restoration of molars with different implant platform positions

Lin Yi, Tao Xian-fa, Wang Yi-bo, Ding Chao, Xing Jian-yu, Xu Ran, Shi Jiu-hui   

  1. Department of Implantology, Branch of Qunli District, the First Affiliated Hospital of Harbin Medical University, Harbin 150001, Heilongjiang Province, China
  • Received:2018-03-13 Online:2018-09-18 Published:2018-09-18
  • Contact: Shi Jiu-hui, Chief physician, Department of Implantology, Branch of Qunli District, the First Affiliated Hospital of Harbin Medical University, Harbin 150001, Heilongjiang Province, China
  • About author:Lin Yi, Master candidate, Department of Implantology, Branch of Qunli District, the First Affiliated Hospital of Harbin Medical University, Harbin 150001, Heilongjiang Province, China

Abstract:

BACKGROUND: Different adjacent alveolar crest heights result in different positions of implant platforms, but implant supported splinted crowns are generally implanted at the same level. To date, studies on different positions of two implants due to the severity of bone defects have not been well documented.

OBJECTIVE: To investigate the stress distribution at the implant-bone interface of two implants with different implant platform positions and to analyze which method of dental restoration has more biomechanical advantages compared with single crown restoration.
METHODS: We prepared four kinds of mandibular models with two same kinds of implants that had different positions of implant platforms. The height difference between implant platforms was 0, 1, 2, 3 mm. Finally eight models were obtained by combinatorial arrangement of splinted crown restoration or single crown restoration. The stress distribution at the implant-bone interface was analyzed by a three-dimensional finite element method.

RESULTS AND CONCLUSION: From the nephogram of Von Mises stress distribution, there was no significant difference in the stress distribution of the crown restoration with different implant platform positions. The maximum equivalent stress of each model was concentrated in the cortical bone region of the neck of the implant. With the increase of the height difference of the implant platforms, the maximum equivalent stress did not increase significantly. Under an axial load, the maximum equivalent stress was ranked as follows: A1 < B1, A2 < B2, A3 > B3, A4 < B4, while under a lateral load, the maximum equivalent stress was ranked as follows: A1 > B1, A2 > B2, A3 > B3, A4 > B4. By comparing the eight models, we found that under the axial load, the stress distribution of implant supported single crown restoration was better than that of implant supported splinted crown restoration, and the optimal height difference was 2 mm. However, under the lateral load, the stress distribution of implant supported splinted crown restoration was better than that of single crown restoration.

中国组织工程研究杂志出版内容重点:生物材料;骨生物材料; 口腔生物材料; 纳米材料; 缓释材料; 材料相容性;组织工程

Key words: Dental Implants, Dental Stress Analysis, Finite Element Analysis, Tissue Engineering

CLC Number: