A Clinical Study on Evaluation of Vertical Accuracy of Interocclusal Registration Materials in Centric Relation

Purpose: The purpose of this study is to evaluate the ability to accurately record, maintain and reproduce vertical interocclusal relationship of four bite registration materials i.e. (Aluwax, zinc oxide eugenol, polyvinylsiloxane, bisacrylic resin bite registration materials).

Statement of problem: It is necessary to evaluate recording materials for their accuracy to record, maintain and reproduce these maxillo-mandibular relationships as they are transferred from the mouth to the articulators.

Materials and method: Maxillary & mandibular cast were articulated in maximum intercuspation in split cast technique on the Whipmix articulator. This position was adopted as reference position for displacement measurement of the four materials. Two arbitrary points are selected on the right and left side of the cast to avoid operator tendency of repetition of the value. The measurements were calculated as the difference between the readings of the two points. The interocclusal records were placed and the measurements were taken. The difference in the two reading gave the vertical discrepancy with each material.

Results: ANOVA and Tukey test were used. The result was statistically significant. Wax plus zinc oxide eugenol and wax plus aluwax showed significant difference statistically & clinically in recording the relationship.

Conclusion: The bisacrylic resin and polyvinylsiloxane bite registration materials can record the interocclusal relationship accurately. Wax plus zinc oxide eugenol paste and wax plus aluwax produced significant discrepancies in recording the relationship.