Influence of various abutment number on stress distribution in the attachment denture supporting tissue

Objective To investigate the stress distribution in the attachment denture supporting tissue with various abutment number. Methods Reconstructed three-dimensional finite element models of the extra-coronal attachment denture with mandibular Kennedy I dentition defect was established andanalyzed the stress distribution of the denture supporting tissue with von Mises ability of sustain pressure when vertical forces were applied. Results The max Von Mises stress of the distant-abutments periodontal membrane were found at the distant-cervical and that of the alveolar bone under the denture were found at the mesial and distal alveolar crest. While the abutment number was increased from one to two and to three, the pressure of the distant-abutments periodontal membrane tends to be proportionately decreased; but the pressure of the alveolar bone decreased no-proportionately. Conclusion The pressure decreased in supporting tissue was not in proportion to the numbers increased in abutment for repairing mandibular distal-extension edentulous dentition with extra-coronal attachment.