›› 2009, Vol. 29 ›› Issue (11): 1282-.

• Monographic report (Prosthodontics) • Previous Articles     Next Articles

Stress analysis of distal-extension prosthetics with mesial and distal occlusal rest

JIN Wen-zhong1, HUANG Qing-feng1, WEI Bin1, ZHANG Fu-qiang1, CUI Wen2, WANG Cheng-tao2   

  1. 1. Department of Prosthodontics, Shanghai Key Laboratory of Stomatology, College of Stomatology, The Ninth People's Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai 200011, China；2. Institute of Biomedical Manufacturing and Life Quality Engineering, School of Mechanical Enginieering, Shanghai Jiaotong University, Shanghai 200240, China
  • Online:2009-11-25 Published:2009-11-24
  • Supported by:

    The Eleventh Five Year Plan National Key Science and Technology Project, 2007BAI18B05; Shanghai Science and Technology Committee Foundation, 08DZ2271100; Shanghai Leading Academic Discipline Fund, T0202

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Abstract:

Objective To investigate the stress distribution in the abutment and supporting tissues of distal-extension removable partial dentures with mesial and distal occlusal rest under loading. Methods A modular denture model was used to build a model of mandibular dentition defect (765-567 loss) with HyperMesh 7.0 software. Prosthetics with mesial (M model) and distal occlusal rest (D model) were designed with UG 5.0 software, and the finite element models were completed with HyperMesh 7.0 software. The stress distribution was analyzed in the abutment and supporting tissues of distal-extension removable partial dentures with mesial and distal occlusal rest when bilateral vertical forces were applied. Results Compared with M model, D model provided much larger maximum stress in abutments and periodontal membrane. Stress of D model mainly concentrated on roots of  4-4 , while that of M model uniformly distributed on roots of  43-34. The maximum stress of M model was significantly larger than that of D model on the mucosa of edentulous region. The maximum stress on alveolar bone of two models-edentulous region was equal, while the stress of M model distributed more widely. Conclusion It is prior to select mesial occlusal rest in distal-extension removable partial dentures.

Key words: free-end edentulous, occlusal rest, finite element analysis