AI Article Synopsis
- The study used 3D finite element analysis to understand how stresses are distributed in loaded posterior fixed partial dentures (FDPs) and how factors like bone height, number of abutments, and pontic length affect their displacement.
- Stresses were mainly concentrated in the connectors and the cervical areas of the abutments that are closest to the empty space (edentulous span).
- Displacements of the FDPs increased with lower bone height and included a small anteroposterior shift towards the weaker abutment side, while the length of the bridge (span) had minimal effect on beam deflection.
Article Abstract
This three-dimensional finite element analysis first described stresses distribution in loaded posterior fixed partial dentures, then compared the influences of bone height, abutment roots number and pontic length on their displacements. Twelve mandibular (three to five unit) FDPs integrating periodontal ligaments were designed. Stresses were localized in connectors and cervical areas of abutments near the edentulous span. The main FDPs' displacements consisted of vertical translation increasing with low bone height. FDPs underwent simultaneously an anteroposterior displacement (about ten times smaller) towards the weakest abutment side. Splinted abutments affected this anteroposterior displacement. Span length was associated with small beam deflection.
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