Stress analysis of the base of mandibular complete overdenture based on post-core abutment and its supporting tissues / 西安交通大学学报(医学版)

ABSTRACT

Objective To study the stress distribution on the base of mandibular complete overdenture based on post-core abutment and its su pporting tissues, and to offer experimental foundation and guidance for clinic. Methods 3-D FEM was used to study the stress distribution on the base of mandibular complete overdenture based on post-core abutment and its supporting tissues, calculate the stress values of denture base, mucosality and cortex of bone, then we compared these values with those of natural abutment . Results Base plate of mandibular complete overdenture had stress concentration phenomenon at abutment zone. The stress value of mucosa on bilateral molar teeth alveolar ridge crest was relatively larger. Cortex of bon e mainly bore compressive stress; cortex of bone around the abutment had obvious stress concentration. Conclusion Denture base may fracture at abutment zone; cort ex of bone around abutment relatively bears more stress, so bone absorption may easily arise. Post-core has little influence on stress distribution of denture base and of mucosa ,while it does have some influence on that of cortex of bone.