Int J Stomatol

Int J Stomatol ›› 2021, Vol. 48 ›› Issue (1): 41-49.doi: 10.7518/gjkq.2021011

• Original Articles • Previous Articles     Next Articles

Three-dimensional finite element study on the effect of pulp opening cavity on the resistance of cracked teeth after full crown restoration

Ji Mengzhen1,Qi Meiyao1,Du Kexin1,Quan Shuqi1,Zhang Yuqiang1,Zheng Qinghua2()   

  1. 1. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China School of Stomatology, Sichuan University, Chengdu 610041, China;
    2. State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Dept. of Cariology and Endodontics, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China;
  • Received:2020-02-23 Revised:2020-07-20 Online:2021-01-01 Published:2021-01-20
  • Contact: Qinghua Zheng E-mail:qhzheng1001@163.com
  • Supported by:
    This study was supported by Youth Program of National Natural Science Foundation of China(11402154)

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Abstract:

Objective To investigate the effect of traditional endodontic cavity and minimally invasive endodontics root canal therapy on the resistance of teeth restored with porcelain crowns. Methods Three dimensional virtual models of cracked teeth with three different depth of crack were made to simulate minimally invasive endodontics and traditional endodontic cavity, and complete root canal therapy and porcelain crown restoration. Under the condition of vertical loading and oblique loading, the distribution and numerical value of tooth stress were recorded. Results Under the two loading conditions, the stress of the teeth before the treatment was concentrated at the bottom of the crack, and the local stress concentration increased with the deepening of the depth of the crack. The local stress of the abutment was mainly distributed at the shoulder after the restoration of the porcelain full crown. The local stress concentration has been greatly alleviated. There was no significant difference in the effect of different endodontic cavity on the stress distribution and magnitude of cracked teeth. Conclusion The restora-tion of porcelain crowns after root canal therapy is an effective measure for the treatment of cracked teeth. Compared with the traditional endodontic cavity, the minimally invasive endodontics cannot improve the stress distribution of cracked teeth after full crown restoration.

Key words: cracked tooth, traditional endodontic cavity, minimally invasive endodontics, porcelain fused to metal crown, finite element analysis

CLC Number: 

  • R781.05

TrendMD: 

Tab 1

Mechanical properties of the investigated materials"

牙体部位 弹性模量/MPa 泊松比
釉质 46 980.00 0.30
牙本质 11 720.00 0.30
牙槽骨 1 370.00 0.30
牙周膜 70.00 0.45
牙胶尖 0.69 0.45
复合树脂 12 000.00 0.30
金钯合金 89 500.00 0.33
瓷层 68 900.00 0.28

Fig 1

Model of cracked tooth after root canal treatment and full-crown restoration"

Fig 3

Working flow of 3D infinite model analysis"

Fig 3

The distribution of stress on each part of Group A under vertical loading"

Fig 4

Working flow of 3D infinite model analysis"

Fig 5

Distribution of stress on enamel and other dental tissue of model A, B and C before treatment under vertical loading"

Fig 6

Distribution of stress on abutment of all tested groups after restoration under vertical loading"

Fig 7

The maximum value of stress on the abutment before and after restoration under vertical stress"

Tab 2

The distribution and numerical value of tooth stress in all tested groups under vertical stress"

隐裂深度/mm 是否修复及方法 牙体组织应力最大部位 应力最大值/MPa
3.4 修复前 集中于裂纹底部 54.60
传统开髓+烤瓷全冠 分布于近中肩台 31.45
微创开髓+烤瓷全冠 分布于近中肩台 30.42
5.1 修复前 集中于裂纹底部 68.37
传统开髓+烤瓷全冠 分布于近中肩台 33.12
微创开髓+烤瓷全冠 分布于近中肩台 30.75
7.2 修复前 集中于裂纹底部 253.45
传统开髓+烤瓷全冠 分布于近中肩台 32.40
微创开髓+烤瓷全冠 分布于近中肩台 32.10

Tab 3

The distribution and numerical value of tooth stress in all tested groups under oblique stress"

隐裂深度/mm 是否修复及方法 牙体组织应力最大部位 应力最大值/MPa
3.4 修复前 集中于裂纹底部 347.42
传统开髓+烤瓷全冠 分布于近中肩台 67.25
微创开髓+烤瓷全冠 分布于近中肩台 64.23
5.1 修复前 集中于裂纹底部 486.84
传统开髓+烤瓷全冠 分布于近中肩台 68.84
微创开髓+烤瓷全冠 分布于近中肩台 67.66
7.2 修复前 集中于裂纹底部 1 191.50
传统开髓+烤瓷全冠 集中于裂纹底部 117.30
微创开髓+烤瓷全冠 集中于裂纹底部 120.69

Fig 18

The distribution of stress on enamel and other dental tissue of model A, B and C before treatment under oblique loading"

Fig 9

Distribution of stress on abutment of all tested groups after restoration under oblique loading"

Fig 10

The maximum value of stress on the abutment before and after restoration under oblique stress"

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