Journal of Prevention and Treatment for Stomatological Diseases ›› 2021, Vol. 29 ›› Issue (11): 740-745.doi: 10.12016/j.issn.2096-1456.2021.11.003

• Basic Study • Previous Articles     Next Articles

Effects of the different materials and thicknesses on endocrown stress distribution

LIN Jie1(),LIN Zhenxiang2,ZHENG Zhiqiang1()   

  1. 1. Department of VIP Dental Service, School and Hospital of Stomatology, Fujian Medical University, Fuzhou 350002, China
    2. Department of Stomatology, Hospital of Fujian Provincial Authorities, Fuzhou 350003, China
  • Received:2021-03-26 Revised:2021-04-23 Online:2021-11-20 Published:2021-07-20
  • Contact: Zhiqiang ZHENG E-mail:linjie.dds@gmail.com;395711575@qq.com
  • Supported by:
    National Natural Science Foundation of China(81300907);Fujian Health and Family Planning Young and Middle-aged Talents Project(2016-ZQN-60)

Abstract:

Objective To analyze the effects of different restorations and the thickness of the occlusal space on the stress distribution of endodontically treated molars with endocrowns. Methods The finite element model of the restoration of the first mandibular molar was created, and four different endocrown materials were used including two resin based ceramics (Lava Ultimate, Vita Enamic), one lithium disilicate ceramic (IPS e.max CAD) and one zirconia ceramics (Cercon), and four kinds of surface space thickness were designed: 1 mm, 2 mm, 3 mm and 4 mm. A total of 600 N was loaded to simulate the maximum bite force in the vertical and inclined directions, and the finite element software ANSYS 10.0 was used to analyze the stress distribution.Results The vertical loading analysis showed that the crown stress of the 1 mm-Cercon group was the highest at 211.30 MPa, and that of the 4 mm-Lava Ultimate group was the lowest at 11.56 MPa; the highest dentin stress was 38.84 MPa in the 3 mm-Lava Ultimate group, and the lowest was 11.68 MPa in 1 mm-Cercon group. The stress in the periodontal ligament and alveolar bone had little change. The inclined loading analysis showed that the crown stress of the 1 mm-Cercon group was the highest at 78.73 MPa and that of the 1 mm-Lava Ultimate group was the lowest at 35.51 MPa; the highest dentin stress was 41.63 MPa in the 1 mm-Cercon cervical group, and the lowest was 10.81 MPa in the 4 mm-Cercon coronal group. The stress concentration of cement and cervical dentin under inclined loading was higher than that under vertical loading. Conclusion The results of finite element analysis show that the elastic modulus of the endocrown increases, the stress of the crown restoration shows an upward trend, and the stress in the tooth shows a downward trend. With increasing crown thickness, the stress of the crown prosthesis decreased.

Key words: endocrown, thickness, zirconia, resin based ceramics, lithium disilicate ceramics, zirconia ceramics, finite element method, stress distribution

CLC Number: 

  • R78

Figure 1

Finite element model and the loading diagram From left to right, endocrown models with different thicknesses from 1 mm to 4 mm were designed, and the vertical and oblique loading directions are illustrated"

Table 1

Material and tissue properties"

Young’s modulus (GPa) Poisson ratio
Lava Ultimate 12.70 0.45
Vita Enamic 37.80 0.24
IPS e.max CAD 95.00 0.25
Cercon 205.20 0.24
Resinous cement 7.50 0.30
Enamel 84.10 0.33
Dentin 18.60 0.32
Periodontal ligament 0.15×10-3 0.45
Cortical bone 10.40 0.34
Food bolus 3.41×10-3 0.10

Table 2

Maximum principal stress value loaded in the vertical direction MPa"

Endocrown Cement Enamel Dentin Periodontal ligament Bone
1 mm-Lava Ultimate 12.61 12.69 42.19 24.22 3.25 8.98
1 mm-Vita Enamic 35.82 9.98 32.29 15.23 3.24 8.03
1 mm-IPS e.max CAD 116.63 14.41 27.35 12.47 3.22 7.60
1 mm-Cercon 211.30 18.73 23.34 11.68 3.22 7.39
2 mm-Lava Ultimate 12.83 17.71 60.57 38.25 3.25 9.03
2 mm-Vita Enamic 23.52 10.77 42.28 24.96 3.24 8.06
2 mm-IPS e.max CAD 54.56 13.98 33.73 19.30 3.24 7.63
2 mm-Cercon 90.53 17.97 28.53 16.06 3.23 7.43
3 mm-Lava Ultimate 11.94 17.91 62.28 38.84 3.25 8.95
3 mm-Vita Enamic 20.98 10.56 42.64 24.89 3.24 7.99
3 mm-IPS e.max CAD 39.14 13.71 34.69 19.93 3.24 7.59
3 mm-Cercon 57.35 17.45 30.37 17.43 3.23 7.40
4 mm-Lava Ultimate 11.56 16.98 54.26 27.46 3.25 8.92
4 mm-Vita Enamic 18.62 8.39 36.81 15.21 3.24 7.98
4 mm-IPS e.max CAD 35.06 12.37 30.22 12.69 3.22 7.61
4 mm-Cercon 46.13 15.79 26.80 12.25 3.22 7.45

Table 3

Maximum principal stress value loaded in the inclined direction MPa"

Endocrown Cement Enamel (Buccal) Enamel (Lingual) Dentin (Coronal) Dentin (Cervical) Periodontal ligament Bone
1 mm-Lava Ultimate 35.51 12.22 16.62 25.88 15.96 35.20 8.55 21.06
1 mm-Vita Enamic 44.98 16.00 8.30 25.02 12.59 39.19 8.54 20.71
1 mm-IPS e.max CAD 60.83 19.07 7.47 25.89 14.32 40.86 8.54 20.67
1 mm-Cercon 78.73 21.03 7.23 26.24 15.79 41.63 8.52 20.48
2 mm-Lava Ultimate 35.94 13.92 26.71 20.59 16.46 35.25 8.57 20.68
2 mm-Vita Enamic 37.75 15.69 13.75 17.96 12.07 39.25 8.55 20.44
2 mm-IPS e.max CAD 45.67 18.18 9.12 17.38 13.33 40.77 8.54 20.35
2 mm-Cercon 62.21 19.46 6.43 17.15 14.14 41.41 8.51 20.14
3 mm-Lava Ultimate 37.52 14.22 28.93 28.72 16.46 35.53 8.57 21.03
3 mm-Vita Enamic 39.08 14.87 16.92 23.76 11.65 39.37 8.56 21.01
3 mm-IPS e.max CAD 47.56 16.38 12.80 21.53 11.36 40.68 8.55 20.67
3 mm-Cercon 64.45 16.69 10.26 20.28 11.28 41.17 8.52 20.55
4 mm-Lava Ultimate 37.37 14.20 27.14 18.90 16.99 35.78 8.59 20.86
4 mm-Vita Enamic 40.57 13.00 16.06 11.78 11.17 39.34 8.54 20.73
4 mm-IPS e.max CAD 43.76 13.16 11.98 10.17 10.94 40.40 8.54 20.53
4 mm-Cercon 58.12 12.53 9.44 9.54 10.81 40.75 8.51 20.45

Figure 2

Distribution of the maximum principal stress of each group loaded in the vertical direction Different colors represent different stress ranges. From 1 mm to 4 mm, with increasing crown thickness, the peak stress of the crowns decreased. From top to bottom, with the increase in the elastic modulus of the endocrown, the stress of crown restoration showed an upward trend while the stress of the tooth showed a downward trend. The arrow indicates that the stress of the lava ultimate group was concentrated in the tooth tissue"

Figure 3

Distribution of the maximum principal stress of each group loaded in the inclined direction Different colors represent the different stress ranges. The stress concentration of cement and cervical dentin under inclined loading was higher than that under vertical loading. From the top to the bottom, with the increase in the elastic modulus of the pulp retention crown, the stress of crown restoration showed an upward trend while the stress of the tooth showed a downward trend. Red and black arrows indicate the stress concentration areas of the crown and neck dentin, respectively"

[1] Saber SM, Hayaty DM, Nawar NN, et al. The effect of access cavity designs and sizes of root canal preparations on the biomechanical behavior of an endodontically treated mandibular first molar: a finite element analysis[J]. J Endod, 2020(20):S0099-2399(20)30451. doi: 10.1016/j.joen.2020.06.040.
[2] Baniasadi M, Darijani H, Parirokh M, et al. Evaluating the effect of oblique ridge conservation on stress distribution in an endodontically treated maxillary first molar: a finite element study[J]. J Endod, 2021, 47(3):500-508. doi: 10.1016/j.joen.2020.12.010.
doi: 10.1016/j.joen.2020.12.010
[3] Falahchai M, Babaee Hemmati Y, Neshandar Asli H, et al. Marginal gap of monolithic zirconia endocrowns fabricated by using digital scanning and conventional impressions[J]. J Prosthet Dent, 2021, 125(2):325.e1-325e5. doi: 10.1016/j.prosdent.2020.05.042.
doi: 10.1016/j.prosdent.2020.05.042
[4] Dartora NR, Maurício Moris IC, Poole SF, et al. Mechanical behavior of endocrowns fabricated with different CAD-CAM ceramic systems[J]. J Prosthet Dent, 2021, 125(1):117-125. doi: 10.1016/j.prosdent.2019.11.008.
doi: 10.1016/j.prosdent.2019.11.008
[5] 林珍香, 潘在兴, 叶起清, 等. 二硅酸锂陶瓷和氧化锆髓腔固位冠的牙合面厚度设计对抗折性能的影响[J]. 华西口腔医学杂志, 2020, 38(6):647-651. doi: 10.7518/hxkq.2020.06.007.
Lin ZX, Pan ZX, Ye QQ, et al. Effect of occlusal thickness design on the fracture resistance of endocrowns restored with lithium disilicate ceramic and zirconia[J]. West Chin J Stomatol, 2020, 38(6):647-651. doi: 10.7518/hxkq.2020.06.007.
[6] 皮昕. 口腔解剖生理学[M]. 5版. 北京: 人民卫生出版社, 2003: 38-40.
Pi X. Oral anatomy and physiology[M]. 5th ed. Beijing: People’s Medical Publishing House, 2003: 38-40.
[7] Dal Piva AMO, Tribst JPM, Borges ALS, et al. CAD-FEA modeling and analysis of different full crown monolithic restorations[J]. Dent Mater, 2018, 34(9):1342-1350. doi: 10.1016/j.dental.2018.06.024.
doi: 10.1016/j.dental.2018.06.024
[8] Tribst JPM, Dal Piva AMO, Madruga CFL, et al. Endocrown restorations: Influence of dental remnant and restorative material on stress distribution[J]. Dent Mater, 2018, 34(10):1466-1473. doi: 10.1016/j.dental.2018.06.012.
doi: 10.1016/j.dental.2018.06.012
[9] Lin J, Matinlinna JP, Shinya A, et al. Effect of fiber post length and abutment height on fracture resistance of endodontically treated premolars prepared for zirconia crowns[J]. Odontology, 2018, 106(2):215-222. doi: 10.1007/s10266-017-0320-7.
doi: 10.1007/s10266-017-0320-7
[10] Belli R, Wendler M, de Ligny D, et al. Chairside CAD/CAM materials. Part 1: measurement of elastic constants and microstructural characterization[J]. Dent Mater, 2017, 33(1):84-98. doi: 10.1016/j.dental.2016.10.009.
doi: 10.1016/j.dental.2016.10.009
[11] Lin J, Lin Z, Zheng Z. Effect of different restorative crown design and materials on stress distribution in endodontically treated molars: a finite element analysis study[J]. BMC Oral Health, 2020, 20(1):226. doi: 10.1186/s12903-020-01214-3.
doi: 10.1186/s12903-020-01214-3
[12] Al-Dabbagh RA. Survival and success of endocrowns: a systematic review and meta-analysis[J]. J Prosthet Dent, 2021, 125(3):415.e1-415.e9. doi: 10.1016/j.prosdent.2020.01.011.
doi: 10.1016/j.prosdent.2020.01.011
[13] Taha D, Spintzyk S, Schille C, et al. Fracture resistance and failure modes of polymer infiltrated ceramic endocrown restorations with variations in margin design and occlusal thickness[J]. J Prosthodont Res, 2018, 62(3):293-297. doi: 10.1016/j.jpor.2017.11.003.
doi: 10.1016/j.jpor.2017.11.003
[14] 李杰森, 林珍香, 吴东, 等. 不同全瓷修复材料和厚度在种植牙冠修复的有限元分析[J]. 口腔疾病防治, 2021, 29(3):166-170. doi: 10.12016/j.issn.2096-1456.2021.03.004.
Li JS, Lin ZX, Wu D, et al. Finite element analysis of the stress distribution of dental implant crowns with different all-ceramic materials and thicknesses[J]. J Prev Treat Stomatol Dis, 2021, 29(3):166-170. doi: 10.12016/j.issn.2096-1456.2021.03.004.
[15] Hasanzade M, Moharrami M, Alikhasi M. Evaluation of marginal and internal adaptation of endocrowns fabricated from three different CAD/CAM materials[J]. Eur J Prosthodont Restor Dent, 2019, 27(4):164-171. doi: 10.1922/EJPRD_01931Hasanzade08.
doi: 10.1922/EJPRD_01931Hasanzade08 pmid: 31638349
[1] CHEN Hongxing,LIU Siyao,HUANG Yuting,PAN Shuang. Stress distribution of composite resin filling in Class I cavity of molars with different cavosurface angle [J]. Journal of Prevention and Treatment for Stomatological Diseases, 2021, 29(9): 596-603.
[2] WANG Chengyu,FAN Yawei,WANG Jue. Comparison of platelet rich fibrin and acellular dermal matrix in repairing rabbits′ oral mucosal defects [J]. Journal of Prevention and Treatment for Stomatological Diseases, 2021, 29(7): 442-448.
[3] ZHANG Ying,HU Dandan,HUANG Haoning,LUO Xiaoping. Effect of different treatments of highly translucent zirconia on the bonding strength between zirconia and veneering porcelain [J]. Journal of Prevention and Treatment for Stomatological Diseases, 2021, 29(7): 456-461.
[4] LI Meng,CHEN Xiaotao,TUEDI Ayguli. Research progress on micro-osteoperforation-assisted orthodontic treatment [J]. Journal of Prevention and Treatment for Stomatological Diseases, 2021, 29(7): 496-499.
[5] LI Jiesen,LIN Zhenxiang,WU Dong,ZHENG Zhiqiang,LIN Jie. Finite element analysis of the stress distribution of dental implant crowns with different all-ceramic materials and thicknesses [J]. Journal of Prevention and Treatment for Stomatological Diseases, 2021, 29(3): 166-170.
[6] WANG Yanlin,SUN Xiaojun. A study of the maxillary sinus lateral wall thickness using cone-beam CT [J]. Journal of Prevention and Treatment for Stomatological Diseases, 2021, 29(11): 761-765.
[7] Chen WANG. Influence of two kinds of zirconia primers on the bonding effect of zirconia ceramics [J]. Journal of Prevention and Treatment for Stomatological Diseases, 2020, 28(2): 79-83.
[8] ZHANG Yunhan,DENG Xiaoyu,WANG Yan,ZOU Jing,ZHANG Qiong. Progress in restorative treatments of primary incisor defects [J]. Journal of Prevention and Treatment for Stomatological Diseases, 2020, 28(2): 131-136.
[9] GUAN Darong, ZOU Kangyuan, CHEN Jueqing, DENG Xiangdong, FU Zhennan. Effect of thermal etching on the shear strength of zirconia substrate and decorative porcelain [J]. Journal of Prevention and Treatment for Stomatological Diseases, 2019, 27(8): 496-499.
[10] XU Ruonan,Gulinuer AWUTI. Influential factors and methods of evaluating the gingival biotype [J]. Journal of Prevention and Treatment for Stomatological Diseases, 2019, 27(5): 327-330.
[11] ZENG Yongfa,FU Yulin,DAI Qun,SHI Lianshui. Preparation and antibacterial properties of La-doped TiO2 films on 3Y-TZP ceramic surface [J]. Journal of Prevention and Treatment for Stomatological Diseases, 2019, 27(3): 153-158.
[12] SHEN Jiaoxiang,SU Jingjing,HUANG Wenxia. CBCT study of the alveolar bone remodeling after retraction of the maxillary incisors assisting with micro-implant anchorage in maxillary protrusion adults [J]. Journal of Prevention and Treatment for Stomatological Diseases, 2019, 27(12): 769-774.
[13] Jingjing FENG, Hao YU, Hui CHENG. Effects of coloring methods on the properties of dental zirconia [J]. Journal of Prevention and Treatment for Stomatological Diseases, 2018, 26(5): 334-337.
[14] Shuyi TAN,Yifan CHEN. The functional and aesthetic reconstruction of tetracycline stained teeth with a virtual articulator in a CAD/CAM system [J]. Journal of Prevention and Treatment for Stomatological Diseases, 2018, 26(11): 727-734.
[15] Yanan WEI,Zhiyun CAO. Research progress of three-dimensional finite element analysis in unilateral maxillary defect restorations [J]. Journal of Prevention and Treatment for Stomatological Diseases, 2018, 26(10): 677-680.
Viewed
Full text


Abstract

Cited

  Shared   
  Discussed   
[1] . [J]. journal1, 2016, 24(1): 58 -60 .
[2] Juan LI,Ting HUANG,Wen XUE,Hai-yan LI. Clinical efficacy of basic periodontal therapy combined with local medication for erosive oral lichen planus[J]. Journal of Prevention and Treatment for Stomatological Diseases, 2016, 24(3): 162 -165 .
[3] Ming CHEN,Xi CHEN,Zhen-ting ZHANG. The precision comparison of the denture occlusal plane preparation by the occlusal plane plate between experienced and newly-graduated dentists[J]. Journal of Prevention and Treatment for Stomatological Diseases, 2016, 24(3): 173 -176 .
[4] Zhong-juan TAN,Yue-ping ZHAO,Yuan-yuan LUO. The research progress of dental pulp regeneration[J]. Journal of Prevention and Treatment for Stomatological Diseases, 2016, 24(6): 374 -377 .
[5] Lan LIAO, Lijun ZENG. Updated research on digitalization in aesthetic restoration[J]. Journal of Prevention and Treatment for Stomatological Diseases, 2018, 26(7): 409 -414 .
[6] Yan-mei DONG. Causes and management of post-treatment apical periodontitis[J]. Journal of Prevention and Treatment for Stomatological Diseases, 2016, 24(10): 561 -566 .
[7] LI Chun,LI Yan-hong,LIU Juan. Application of probiotics for dental caries prevention in children[J]. Journal of Prevention and Treatment for Stomatological Diseases, 2016, 24(9): 558 -560 .
[8] Mingyu SUN, Hanjiang WU. Research progresses in occult lymph node metastasis of oral squamous cancer[J]. Journal of Prevention and Treatment for Stomatological Diseases, 2018, 26(1): 61 -65 .
[9] Qian-qian HAN,Zhao LIU,Li JIANG,Hui-yi TANG,Xiao-na LI. Effects of LMK-235 on osteoblast/odontoblast differentiation in hPDLCs[J]. Journal of Prevention and Treatment for Stomatological Diseases, 2016, 24(7): 390 -394 .
[10] Nu MI,Ying GUO,Xiao-yu YANG. Clinical evaluation of anterior teeth aesthetic restoration with thin porcelain laminate veneer[J]. Journal of Prevention and Treatment for Stomatological Diseases, 2016, 24(10): 589 -593 .
This work is licensed under a Creative Commons Attribution 3.0 License.