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Journal of Peking University (Health Sciences) ›› 2021, Vol. 53 ›› Issue (4): 764-769. doi: 10.19723/j.issn.1671-167X.2021.04.024

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Influence of base materials on stress distribution in endodontically treated maxillary premolars restored with endocrowns

JIANG You-sheng,FENG Lin(),GAO Xue-jun   

  1. Department of Cariology and Endodontology, Peking University School and Hospital of Stomatology & National Center of Stomatology & National Clinical Research Center for Oral Diseases & National Engineering Laboratory for Digital and Material Technology of Stomatology,Beijing 100081, China
  • Received:2021-06-15 Online:2021-08-18 Published:2021-08-25
  • Contact: Lin FENG E-mail:1165155446@qq.com
  • Supported by:
    Beijing Natural Science Foundation(7113176)

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Abstract:

Objective: To evaluate the influence of base materials on stress distribution in endodontically treated maxillary premolars restored with endocrowns using three-dimensional finite element analysis. Methods: A maxillary second premolar was scanned by Micro-CT and a three-dimensional finite element model of ceramic endocrown with 1 mm thickness of base was established. A model without base was also established as a negative control. Four kinds of conventional base materials with different elastic modulus were adopted: light cure glass ionomer(3M Vitrebond, 3 657 MPa), flowable composite resin(3M Filtek Z350XT Flowable Restorative, 7 300 MPa), high strength glass ionomer(GC Fuji Ⅸ, 13 130 MPa), and posterior composite resin(3M Filtek P60, 19 700 MPa). With a 200 N force loaded vertically and obliquely, the distribution and magnitude of stress in the tooth tissue and adhesive layer were investigated by three-dimensional finite element analysis. Results: The maximum von Mises stress values(vertical/oblique) in dentin and adhesive layer were measured as follows: (1) no base material: 19.39/70.49 MPa in dentin and 6.97/17.97 MPa in adhesive layer; (2) light cure glass ionomer: 19.00/69.75 MPa in dentin and 6.87/16.30 MPa in adhesive layer; (3) flowable composite resin: 18.78/69.33 MPa in dentin and 6.79/16.17 MPa in adhesive layer; (4) high strength glass ionomer: 18.71/69.20 MPa in dentin and 6.74/16.07 MPa in adhesive layer; (5) posterior composite resin: 18.61/69.03 MPa in dentin and 6.70/16.01 MPa in adhesive layer. Under the same loading condition, models with different elastic moduli of base materials had similar stress distribution patterns. The von Mises stress of tooth tissue was mainly concentrated in the tooth cervix. Under oblique load, the regions where von Mises stress concentrated in were similar to those under a vertical load, but the values increased. The stress concentration in the tooth cervix was alleviated in models with base materials compared with the model without base material. The maximum von Mises stress in the tooth tissue and adhesive layer decreased when the elastic modulus of base materials increased and got close to that of dentin. Conclusion: The posterior composite resin of which the elastic moduli is high and close to that of dentin is recommended as base material for premolar endocrowns to alleviate the concentration of stress in tooth cervix and adhesive layer.

Key words: Finite element analysis, Endocrown, Base materials, Maxillary premolar

CLC Number: 

  • R782.1

Figure 1

Sectional view of solid models A, 1 mm thickness of base material; B, no base material."

Figure 2

Solid model of maxillary premolar restored with endocrown"

Figure 3

Finite-element model of maxillary premolar restored with endocrowns"

Table 1

Properties of materials used in finite element analysis models"

Materials Elastic modulus/MPa Poisson ratio
Enamel 84 100 0.33
Dentin 18 600 0.31
Periodontal ligament 70 0.45
Cortical bone 13 700 0.30
Cancellous bone 1 370 0.30
Endocrown 10 000 0.20
Adhesive layer 5 000 0.29
Light cure glass ionomer 3 657 0.36
Flowable composite resin 7 300 0.39
High strength glass ionomer 13 130 0.30
Posterior composite resin 19 700 0.32

Table 2

Maximum von Mises stress values in enamel, dentin, adhesive layer, and restoration /MPa"

Items Enamel Dentin Adhesive layer Base material Restoration
Vertical Oblique Vertical Oblique Vertical Oblique Vertical Oblique Vertical Oblique
No base material 51.20 152.00 19.39 70.49 6.97 17.97 409.90 447.50
Light cure glass ionomer 50.45 151.20 19.00 69.75 6.87 16.30 4.89 14.09 448.80 429.20
Flowable composite resin 49.61 149.80 18.78 69.33 6.79 16.17 5.81 14.44 448.90 429.20
High strength glass ionomer 48.96 148.60 18.71 69.20 6.74 16.07 7.46 17.14 449.00 429.30
Posterior composite resin 48.55 147.80 18.61 69.03 6.70 16.01 8.56 20.73 449.10 429.30

Figure 4

von Mises stress distributions in maxillary premolar restored with endocrowns and different base materials under oblique load of 200 N A, enamel; B, dentin; C, restoration; D, adhesive layer; E, base material. Unit: MPa."

Figure 5

von Mises stress distributions in maxillary premolar restored with endocrowns and different base materials under vertical load of 200 N A, enamel; B, dentin; C, restoration; D, adhesive layer; E, base material. Unit: MPa."

Figure 6

Von Mises stress distributions in the lingual wall of pulp chamber under oblique load of 200 N Arrows shows the stress concentration inside the pulp chamber. Unit: MPa."

[1] Zelic K, Vukicevic A, Jovicic G, et al. Mechanical weakening of devitalized teeth: three-dimensional finite element analysis and prediction of tooth fracture [J]. Int Endod J, 2015, 48(9):850-863.
doi: 10.1111/iej.12381 pmid: 25243348
[2] 包旭东. 椅旁计算机辅助设计与辅助制作嵌体冠粘接修复大面积缺损根管治疗牙的利与弊 [J]. 中华口腔医学杂志, 2018, 53(4):221-225.
[3] Bindl A, Mörmann WH. Clinical evaluation of adhesively placed Cerec endo-crowns after 2 years-preliminary results [J]. J Adhes Dent, 1999, 1(3):255-265.
pmid: 11725673
[4] 李智, 高承志, 许永伟, 等. 铸造陶瓷高嵌体修复根管治疗后前磨牙的3年临床效果观察 [J]. 华西口腔医学杂志, 2015, 33(3):263-266.
[5] Belleflamme MM, Geerts SO, Louwette MM, et al. No post-nocore approach to restore severely damaged posterior teeth: An up to 10-year retrospective study of documented endocrown cases [J]. J Dent, 2017, 63:1-7.
doi: S0300-5712(17)30093-3 pmid: 28456557
[6] 冯娟, 郭慧慧, 申晋斌, 等. 磨牙髓室底垫底厚度对全瓷嵌体冠应力分布的影响 [J]. 牙体牙髓牙周病学杂志, 2017, 27(1):16-21.
[7] 王惠芸. 我国人牙的测量和统计 [J]. 中华口腔科杂志, 1959, 7(3):149-155.
[8] 张丹, 白保晶, 张振庭. 垫底厚度对全瓷嵌体修复应力分布影响的三维有限元分析 [J]. 北京口腔医学, 2015, 23(2):105-108.
[9] Ilie N, Hickel R. Investigations on a methacrylate-based flowable composite based on the TM technology [J]. Dent Mater, 2011, 27(4):348-355.
doi: 10.1016/j.dental.2010.11.014
[10] Yap AUJ, Wang X, Wu X, et al. Comparative hardness and modulus of tooth-colored restoratives: A depth-sensing microindentation study [J]. Biomaterials, 2004, 25(11):2179-2185.
doi: 10.1016/j.biomaterials.2003.09.003
[11] Papadogiannis DY, Lakes RS, Papadogiannis Y, et al. The effect of temperature on the viscoelastic properties of nano-hybrid composites [J]. Dent Mater, 2008, 24(2):257-266.
pmid: 17640723
[12] Zhu J, Rong Q, Wang X, et al. Influence of remaining tooth structure and restorative material type on stress distribution in endodontically treated maxillary premolars: A finite element analysis [J]. J Prosthet Dent, 2017, 117(5):646-655.
doi: 10.1016/j.prosdent.2016.08.023
[13] Coldea A, Fischer J, Swain MV, et al. Damage tolerance of indirect restorative materials (including PICN) after simulated bur adjustments [J]. Dent Mater, 2015, 31(6):684-694.
doi: 10.1016/j.dental.2015.03.007
[14] Chung SM, Yap AUJ, Koh WK, et al. Measurement of Poisson’s ratio of dental composite restorative materials [J]. Biomaterials, 2004, 25(13):2455-2460.
pmid: 14751729
[15] 冯瑞明, 薛明. 根管治疗后牙体粘接修复前的髓腔处理 [J]. 中国实用口腔科杂志, 2017, 10(4):193-197.
[16] Farah JW, Powers JM, Dennison JB, et al. Effects of cement bases on the stresses and deflections in composite restorations [J]. J Dent Res, 1976, 55(1):115-120.
pmid: 1060645
[17] Yamamoto T, Takeishi S, Momoi Y. Finite element stress analysis of indirect restorations prepared in cavity bases [J]. Dent Mater J, 2007, 26(2):274-279.
doi: 10.4012/dmj.26.274
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