Journal of AdvancedMedical and Dental Sciences Research

Statement of Problem: The condylar position can vary depending on several factors. One factor could be the type of interocclusal record material used to transfer the maxillomandibular relations on to the articulator. The flow/viscosity of the record material can influence the recording of the retruded condylar position. Purpose: To determine the position and to quantify the change in the position of the condyles in 3 directions, as well as the changes in occlusal surface contacts from recorded condyle position to intercuspal position, when different interocclusal record materials are used. Material and method: The study comprised of 11 dentulous patients. Accurate stone casts were made from hydrocolloid impression material.  Face-bow transfer was done using SAM face-bow.  This maxillary cast was then mounted on the SAM-2 articulator. The Mandibular cast was oriented to the maxillary cast by hand held articulation. This was considered as the Control group. Three different inter-occlusal recording materials used for the study were-Alu wax, Zinc oxide eugenol and Poly ether. To maintain the same thickness between the records for each patient an acrylic jig was placed between the anterior teeth during the recording procedure. These records were placed between the Maxillary and Mandibular casts on the SAM 2 articulator and retruded condylar position readings were been recorded. Then the upper member of the SAM 2 articulator was removed and repositioned by Mandibular position indicator. The 3D readings were tabulated to measure the displacements at the condyles. Maxillary casts of all 3 groups were transferred to the Mandibular position indicator and co-ordinates in X, Y, and Z as well the Delta L and Delta H were recorded. The data obtained from the different inter occlusal records were compared with that of readings of Hand held articulation. The MPI data, that is Delta Y, Delta X and Delta Z were evaluated and analyzed. The relative change in the position in different axis were subjected to statistical analysis using one way analysis of variance and Tukey’s test. Result: The overall comparison of the changes in the positions of the condyles in different axes among the different groups used in the study was proved to be statistically insignificant. Similarly, comparison of the changes in the positions of the occlusal surfaces represented by incisal pin and guidance table among the different groups used in the study was also proved to be statistically insignificant. Conclusion: No significant change in the position of the condyles as well as incisal pin and guidance table relationship were found among the mounted models as well as in occlusal surface contacts from recorded condyle position to intercuspal position.
Key words: Retruded condylar position, interocclusal records, maximum intercuspal position.

Corresponding Author: Dr. Anulekha C.K, Reader, Department of Prosthodontics, Kamineni Institute of Dental Sciences, Narketpally, Hyderabad, Telangana, India

This article may be cited as: CK Anulekha, Shetty SR, M Taruna, Lekha, Nadigar R. Comparative evaluation of changes in positions of working models mounted on SAM-II articulators using three different interocclusal record materials –An in vivo study . J Adv Med Dent Scie Res 2016;4(6):302-309.