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.
Highlights
Oral rehabilitation involves a sequence of steps that must be followed in a highly judicious manner
Successful treatment is In spite of these advantages, the combination of acrylic highly dependent on precise mounting of the casts in the resin + wax + Duralay presented the second highest articulator
Intermaxillary recording plays an mean value of vertical separation between casts, even extremely important role in final results
Summary
Oral rehabilitation involves a sequence of steps that must be followed in a highly judicious manner. The success of any prosthetic rehabilitating treatment depends on several aspects related to the precise mounting of casts in the articulator. On the other hand, when large edentulous spaces are present, in posterior free end cases, cast mounting is considerably more complex [7]. The lack of teeth that articulate with their antagonists poses an additional difficulty to recording and increases the need for accurate transfer of the interocclusal relationship and vertical dimension [8]. These parameters are usually fulfilled by using registration bases fitted into wide edentulous spaces or free ends. The recording base should provide adequate fitting as well as rigidity and stability
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