Clinical evaluation of interocclusal recording materials in bilateral free end cases

Abstract

Five combinations of materials commonly used for intermaxillary records in cases of bilateral free end saddle were evaluated: acrylic resin base + wax; acrylic resin base + wax + ZOE paste; acrylic resin base + wax + Duralay resin; condensation silicone; and acrylic resin plate + irreversible hydrocolloid. The materials were evaluated by measuring the vertical distance between pairs of reference points located on the bases of the upper and lower articulated casts. The measurements obtained by manual articulation of the casts were used as the standards to which the measurements obtained with the recording materials were compared. ANOVA revealed significant differences among the materials and the Tukey's test showed that condensation silicone differed significantly (p<0.05) from the acrylic resin + wax combination, while no significant differences (p>0.05) were observed among the remaining materials. The condensation silicone presented the greatest differences from the measurements obtained by manual articulation of the casts whereas the acrylic resin base + wax combination presented the least differences. Based on the findings of this study, the following scale of fidelity can be settled from best to worst: acrylic resin base + wax; acrylic resin plate + alginate; acrylic resin base + wax + ZOE; acrylic resin base + wax + Duralay; and condensation silicone.

Evaluation of Dimensional Stability and Surface Hardness of Interocclusal Recording Materials at Various Time Intervals

“…The records utilized for the edentulous and dentulous patients should be dependable with great strength and ought to be ready to imitate the specific maxilla–mandibular position in an articulator. [ 1 ] Materials utilized for maxilla–mandibular registration techniques and incorporate waxes, Zinc oxide eugenol (ZOE) paste, modeling compound, acrylic resin, plaster, and elastomeric materials, for example, polyether, polyvinyl siloxane. [ 2 ] In any case, in this study interocclusal records were made with polyvinyl siloxane, bite registration wax, and ZOE and looked at for their dimensional stability and surface hardness.…”