Journal of Prevention and Treatment for Stomatological Diseases ›› 2018, Vol. 26 ›› Issue (7): 445-450.doi: 10.12016/j.issn.2096-1456.2018.07.007

• Basic Study • Previous Articles     Next Articles

Stress analysis of simulated maxillary first molar prepared with three rotary nickel-titanium instruments

Li YUAN1(), Xueling BAI2, Sa LI1, Yan JIN1, Hongxia YOU1, Shengxing HUANG1()   

  1. 1. Department of Stomatology, Shenzhen People's Hospital, Second Clinical Medical College of Jinan University, Shenzhen 518020, China
    2. Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
  • Received:2018-01-02 Revised:2018-02-14 Online:2018-07-20 Published:2018-08-30

Abstract:

Objective To compare the differences in the stress distribution in simulated first molars prepared with three rotary nickel-titanium instruments. Methods Four simulated first molars were prepared without instruments and with Reciproc, WaveOne and Protaper. Before and after preparation, each simulated molar was scanned by Micro-CT. The data were imported to Mimics 16.0 software to establish three-dimensional models. Finite element analysis was processed with Abaqus 6.14 software under conditions of longitudinal and lateral load. Results Under vertical load conditions, the maximum von Mises stress of the enamel increased by 1.36%, 21.48% and 20.99% in the Reciproc, WaveOne and Protaper groups, respectively, after preparation, while the maximum von Mises stress of the cementum increased by 55.98%, 41.18% and 33.04%, respectively, and the maximum von Mises stress of the alveolar bone increased by 45.55%, 40.37% and 24.09%, respectively. Under 45° lateral load conditions, the maximum von Mises stress of the enamel increased by 1.79%, -4.58% and 3.82% in the Reciproc, WaveOne and Protaper groups, respectively, after preparation, while the maximum von Mises stress of cementum increased by 16.33%, 7.58% and 4.32%, respectively, and the maximum von Mises stress of the alveolar bone increased by 46.82%, 36.40% and 8.29%, respectively. Under the same conditions, the von Mises stresses of the cementum and alveolar bones of the simulated molars were higher after preparation than before preparation, especially under lateral load conditions. The stress was focused on the border between the crown and the root. The von Mises stress of the cementum and alveolar bones increased much more in the Reciproc group than in the other two groups under both conditions. Conclusion The von Mises stress of simulated molars was greater after preparation than before preparation. The von Mises stress of the cementum and alveolar bones increased much more in the Reciproc group than in the other two groups.

Key words: Root canal preparation, Nickel-titanium instruments, Stress, Single files, Micro-computed tomography, Finite element analysis

CLC Number: 

  • R781.05

Figure 1

The process of Micro-CT scanning and geometric modeling"

Figure 2

Grid model before preparation"

Table 1

Mechanical characteristics of all materials"

材料名称 弹性模量E(Gpa) 泊松比δ
牙釉质 84.1 0.30
牙本质 18.6 0.31
牙骨质 13.8 0.30
牙槽骨 8.3 0.35

Figure 3

Load and border conditions"

Table 2

von Mises stress under vertical load von Mises,Mpa"

项目 根管预备
前最大应力
Reciproc WaveOne Protaper
根管预备后
最大应力
较预备前
增幅(%)
根管预备后
最大应力
较预备前
增幅(%)
根管预备后
最大应力
较预备
前增幅(%)
牙釉质 8.10 8.21 1.36 9.84 21.48 9.80 20.99
牙骨质 18.31 28.56 55.98 25.85 41.18 24.36 33.04
牙槽骨 59.85 87.11 45.55 84.01 40.37 74.27 24.09

Figure 4

Stress distribution in molar and alveolar bones under vertical load"

Table 3

von Mises stress under lateral load von Mises,Mpa"

项目 根管预备前
最大应力
Reciproc根管预备后最大应力 较预备前
增幅(%)
WaveOne根管预备
后最大应力
较预备前
增幅(%)
Protaper根管
预备后最大应力
较预备前
增幅(%)
牙釉质 21.18 21.56 1.79 20.21 -4.58 21.99 3.82
牙骨质 44.45 51.71 16.33 47.82 7.58 46.37 4.32
牙槽骨 130.67 191.85 46.82 178.23 36.40 141.50 8.29

Figure 5

Stress distribution in molar and alveolar bones under a 45° lateral load"

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