Effect of physiological relieving of precision attachment retaining mandibular distal extension removable partial denture on the abutment mobility and marginal bone resorption

Twelve male patients with completely dentulous maxillary arches against mandibular bilateral distal extension ridges were selected for this study. The mandibular bicuspids were splinted and used as abutments for intra-control precision attachment retaining mandibular bilateral distal extension removable partial dentures. Patients were classified into two equal groups. The male portion in one group was physiologically relieved to allow some rotational freedom of the free end bases during function. The effect of this relief on abutment mobility and marginal bone resorption was investigated. The results of this study revealed that physicologic relieving of intra-control precision attachment significantly minimized the abutment marginal bone resorption after two years of study

Effect of palatal portion replacement on the vertical pin opening and linear dimensions of maxillary denture relined with heat cured acrylic resin

Twenty four duplicate maxillary dentures were relined with heat cured acrylic resin to study the effect of palatal portion replacement on the linear dimensional changes and vertical pin opening. Dentures relined without palatal portion replacement were compared to those with either the central part or most of the palatal portion; including the posterior palatal border; removed. The results of this study concluded that, palatal portion replacement must be accomplished during relining; preferably; the posterior palatal border must be included in this replacement. The increased vertical dimension after maxillary denture relining is probably attributed to curing shrinkage of the denture base

Effect of record base stabilization on mandibular centric position

Ten completely edentulous patients were selected to investigate the effect of record base stabilization on mandibular centric position. Zinc oxide euginol impression paste, light body rubber base impression material, tissue conditioner, and denture adhesive were used as stabilization materials for the record bases. The mandibular centric position was graphically traced using intra-oral tracer. The results of this study revealed that, record base stabilization is essential for accurate recording of mandibular centric position whatever the stabilization material used. It also revealed that, denture adhesive is a simply highly effective record base stabilization material