Int J Stomatol

Int J Stomatol ›› 2023, Vol. 50 ›› Issue (4): 423-432.doi: 10.7518/gjkq.2023063

• Original Articles • Previous Articles     Next Articles

Finite element analysis of IPS e.maxCAD and Lava Ultimate materials with different thickness in occlusal veneer

Huang Yihuan(),Li Weihang,Ma Dian,Chen Jin,Qian Jie(),Li Xudong.   

  1. Dept. of Prosthodontics, Hospital of Stomatology, Kunming Medical University, Kunming 650106, China
  • Received:2022-10-19 Revised:2023-03-08 Online:2023-07-01 Published:2023-06-21
  • Contact: Jie Qian E-mail:875673900@qq.com;Janeqian@hotmail.com
  • Supported by:
    Medical Reserve Personnel Training of Yunnan Provincial Health Committee(H-2019019);Graduate Innovation Fund of Kunming Medical University(2021S148)

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Abstract:

Objective This study aimed to compare the stress distribution in the left maxillary first molar restored with an occlusal veneer made of two kinds of materials with different thickness and provide a theoretical reference for the clinical application of occlusal veneer. Methods Micro CT data of the left maxillary first molar were extracted and four finite element models of the left maxillary first molar with an occlusal veneer of different thicknesses (0.6 and 1.0 mm) and different materials [IPS e.maxCAD (LD) and Lava Ultimate (LU)] were established, respectively, LD0.6, LD1.0, LU0.6, and LU1.0. Then, the axial load F1 and lateral load F2 of the maxillary first molar were simulated. The maximum principal stress (MaxPS) and minimum principal stress (MinPS) of occlusal veneer, tooth tissue and adhesive layer were recorded under two kinds of loads. The MaxPS and MinPS were quantitatively analyzed by percentage quantification and the failure probability of the models was calculated using Weibull analysis. Results 1) Only the enamel reached the tensile strength of the material. 2) In each group, the MaxPS and the absolute value of MinPS of occlusal veneer of LD-restored teeth were significantly higher than that of LU-restored teeth, with variations of 11.4%- 34.7% and from -18.2% to -9.5%, respectively. However, the MaxPS (from -187.1% to 2.4%) and the absolute value of MinPS (from -1.4% to 16.9%) of tooth tissue and adhesive layer of LD-restored teeth were lower than those of LU-restored teeth. When the restoration thickness increased from 0.6 mm to 1.0 mm, the MaxPS and the absolute value of MinPS of occlusal veneer of LD-restored teeth significantly decreased, with variations from 20.0% to 21.0% and from -5.7% to -3.9%, respectively, whereas that of LU-restored teeth did not change. 3) The failure probability of overall models of F1 and F2 was LU0.6>LU1.0>LD0.6> LD1.0 and LU0.6>LU1.0>LD1.0>LD0.6, respectively. Moreover, the failure probability of F1 was lower than that of F2. Conclusion 1) Compared with LU, occlusal veneer made by LD takes on more stress to protect the dental tissue and adhesive layer. 2) The thickness has a significant effect on the stress distribution of LD, but not on LU.

Key words: finite element analysis, occlusal veneer, material, thickness

CLC Number: 

  • R 783.3

TrendMD: 

Fig 1

Perspective after modeling"

Tab 1

Mechanical properties of materials"

材料弹性模量/MPa泊松比拉伸强度/MPa压缩强度/MPa特征强度/MPa威布尔模量
釉质84 100[11]0.31[11]10.3[12]384.0[12]42.41[10]5.53[10]
牙本质18 600[11]0.31[11]98.7[12]297.0[12]44.45[10]3.35[10]
牙髓2[13]0.45[13]----
牙周膜0.068 9[11]0.45[11]----
皮质骨13 700[11]0.30[11]----
松质骨1 370[11]0.30[11]----
树脂粘接剂8 300[10]0.35[10]45.1[12]178.0[12]453.80[10]4.02[10]
LU12 700[10]0.45[10]160.0*516.0[14]300.64[10]10.90[10]
LD102 700[10]0.22[10]124.0[12]360.0[12]609.80[10]13.40[10]

Tab 2

Elements and nodes of models"

测量项目节点数单元数
0.6 mm试件模型1 410 785941 936
1.0 mm试件模型1 543 1871 040 054

Fig 2

Loading area"

Fig 3

The peak value of MaxPS and percentage of each component"

Fig 4

The peak value of MinPS and percentage of each component"

Tab 3

Comparison of the peak value of MaxPS percentage in each group with different restoration materials"

测量项目*??贴面釉质牙本质粘接层
F1F2F1F2F1F2F1F2
LD0.6-LU0.627.8%34.7%-183.3%-186.9%-0.5%-5.4%-38.2%0.5%
LD1.0-LU1.013.9%11.4%-187.1%-49.3%-0.6%-0.2%-18.6%2.4%

Tab 4

Comparison of the peak value of MinPS per-centage in each group with different restoration materials"

测量项目*??贴面釉质牙本质粘接层
F1F2F1F2F1F2F1F2
LD0.6-LU0.6-18.2%-14.9%16.9%2.2%7.8%7.0%16.3%15.5%
LD1.0-LU1.0-12.5%-9.5%3.3%7.2%-0.4%-1.4%13.3%6.5%

Tab 5

Comparison of the peak value of MaxPS per-centage in each group with different restoration thickness"

测量项目*??贴面釉质牙本质粘接层
F1F2F1F2F1F2F1F2
LD0.6-LD1.021.0%20.0%173.2%-31.4%1.3%-3.0%12.5%0.8%
LU0.6-LU1.07.1%-3.3%169.4%106.2%1.2%2.2%32.1%2.7%

Tab 6

Comparison of the peak value of MinPS per-centage in each group with different restoration thickness"

测量项目*??贴面釉质牙本质粘接层
F1F2F1F2F1F2F1F2
LD0.6-LD1.0-5.7%-3.9%-19.1%-1.0%-1.9%1.4%-34.4%-12.7%
LU0.6-LU1.00.0%1.5%-32.7%4.0%-10.1%-7.0%-37.4%-21.7%

Fig 5

The distribution of MaxPS of occlusal veneer"

Fig 6

The failure probability of overall models"

Fig 7

The failure probability of components"

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