Abstract
Purpose: This study was to investigate the effect of four mandibular major connectors: a lingual bar, a lingual plate, a lingual plate with continuous incisal rests, and it plussed labial hook so that it can be resist the torquing movement, on pressure distribution to the residual ridge under the denture base. This study also sought to determine which could be recommended for long-term clinical service.
Methods: A simulation model was designed to mandibular bilateral distal free-end. When vertical force (294 N) was applied to the experimental denture, the pressure distribution, denture displacement, and strain on the major connector were measured on the simulation model.
Results: 1. In the case of loading on the second molar region, the greatest pressure under both the denture base and the major connectors were observed when a lingual bar was used. 2. Regardless of the major connector designs, the least pressure under the major connector was measured at the loading on the first molar region. 3. The greater displacement occurred in all types of major connectors when the load was applied on the second molar region. 4. The greatest strain and displacement of the denture were observed when a lingual bar was used.
Conclusions: Lingual plate with continuous incisal rests which plussed labial hook indicates minimal displacement and can provide long-term clinical service.
