Three-dimensional finite element analysis of cuspal-coverage thickness influence on the stress distribution of all-ceramic onlay-restored premolars

doi:10.7518/hxkq.2019.06.012

Abstract

Abstract:

Objective To investigate the influence of cuspal-coverage thickness on the stress distribution of all-ceramic onlay-restored premolars by using 3D finite element (FE) analysis and to provide references for the design of all-ceramic onlays for clinical application.Methods 3D FE models of all-ceramic onlays with three cuspal-coverage thicknesses (2, 3, and 4 mm) of endodontically treated maxillary premolar were constructed based on micro-CT images. Stress distributions in the onlay, adhesive resin cement layer, and dentin of models were analyzed under vertical load (600 N) and oblique load (200 N).Results When the cuspal-coverage thickness increased, the peak maximum principal stress value decreased inside the onlay but increased in the margin of the adhesive resin cement layer. In addition, stress concentration areas increased in the coronal residual dentin on the palatal side under oblique load.Conclusion An increase in the cuspal-coverage thickness of all-ceramic onlays may reduce the risk of rupture of the restoration but may deteriorate the restoration and cause palatal dentin fracture.

Key words: finite element analysis, all-ceramic onlay, cuspal-coverage, root canal therapy

CLC Number:

R783

She Yahu,Zhang Yiyi,Liu Yuxuan,Fang Changyun. Three-dimensional finite element analysis of cuspal-coverage thickness influence on the stress distribution of all-ceramic onlay-restored premolars[J]. West China Journal of Stomatology, 2019, 37(6): 636-641.

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组织与材料	弹性模量/MPa	泊松比
釉质^[8]	84 100.0	0.30
牙本质^[9]	18 600.0	0.31
牙槽骨^[9]	13 700.0	0.30
牙髓^[10]	6.8	0.45
牙周膜^[9]	68.9	0.45
树脂粘接剂^[9]	2 800.0	0.33
玻璃离子^[9]	22 000.0	0.35
牙胶^[9]	140.0	0.45
瓷（Vita Mark Ⅱ）^[11]	69 000.0	0.25

组别	高嵌体	粘接剂	粘接剂	冠部牙	根部牙
组别	内部	轴壁	边缘	本质	本质
完整牙齿	-	-	-	11.06	20.12
2 mm模型	42.88	10.65	3.79	11.60	19.95
3 mm模型	22.92	10.14	4.86	10.55	19.82
4 mm模型	20.68	9.97	5.76	9.32	18.63

组别	高嵌体	粘接剂	粘接剂	冠部牙	根部牙
组别	内部	洞底	边缘	本质	本质
完整牙齿	-	-	-	11.19	65.79
2 mm模型	19.54	12.93	4.19	15.04	73.95
3 mm模型	18.16	11.86	7.48	13.11	73.39
4 mm模型	16.49	11.85	13.30	11.81	72.64