Finite Element Analysis of Different Designs for Maxillary First Premolars with Lingual Cusp Oblique Defect.

doi:10.13701/j.cnki.kqyxyj.2019.10.011

Abstract

Abstract: Objective: To analyze the stress distribution of the maxillary first premolar oblique defect with different methods by three-dimensional finite element analysis. Methods: Three dimensional finite element models of maxillary first premolar oblique defect were created by cone beam CT. The intact maxillary first premolar was served as the control group. Experimental groups were established according to different design. The stresses were investigated using finite element analysis software. Results: (1) The stresses of the residual dentine were increased by reduced depth of endocrowns restoration and increased elastic modulus of the material in certain range. (2) The stresses of the residual dentine in the fiber post and crown restoration of lingual canal group (C2) were smaller than that of the buccal canal group (C1) (P<0.05). The stresses of the residual dentine in the metal post and crown restoration of buccal canal group (D1) were smaller than that of the lingual canal group (D2) (P<0.05). (3) The stresses of the residual dentine of Lava Ultimate Endocrown restoration with the 4mm depth was lower than that of the lingual canal with the fiber post and crown restoration (P<0.05). Conclusion: When the maxillary first premolar is obliquely fractured, Lava Ultimate endocrown restoration with the 4mm depth may be the best restoration. If fiber post and crown restoration is choosed, lingual canal should be selected. When metal post and crown restoration is choosed, buccal canal should be selected.

Key words: maxillary first premolar, oblique defect, Endocrowns, post, finite element

KANG Ting, SHI Siqiong, ZHAO Wei, ZHENG Rui, LI Xixi, XIE Jing, GUO Ling. Finite Element Analysis of Different Designs for Maxillary First Premolars with Lingual Cusp Oblique Defect.[J]. Journal of Oral Science Research, 2019, 35(10): 953-956.

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