Abstract:

Objective To investigate the stress distribution of supporting tissues in mandible  implantretained overdentures with lingualized occlusion and anatomic occlusion under the loads of centric, lateral and protrusive occlusion. Methods Photoelastic models of epoxy were fabricated according to the Cawood Ⅴ edentulous model with two implants in the area between lateral incisor and canine with three dimension photoelastic experiment method. One kilogram force was vertically applied in the centric, lateral and protrusive occlusion. After stress frozen, the stress distribution of supporting tissues in mandible implant-retained overdentures with lingualized occlusion and anatomic occlusion was evaluated. Results When using implant-retained overdentures, the force between working and balancing side of lingualized occlusion was smaller than that of anatomic occlusion, and the implant stress of lingualized occlusion was less than that of anatomic occlusion in both lateral and protrusive load. Conclusion When using two-implant-retained overdentures, lingualized occlusion could protect the bone around the implant, and was more stable in lateral movement, which might be considered first for complete implant-retained overdenture.

Key words: lingualized occlusion, implant-retained overdenture, balanced occlusion, complete denture, photoelastic experiment