Comparative analysis of the retention of maxillary denture base with and without border molding using zinc oxide eugenol impression paste

Abstract

Aims and objectives: The purpose of the study was to determine the effect of border molding on the retention of the maxillary denture base.

Materials and methods: Two special trays, one with full extensions to the periphery and one 2 mm short from the borders were made on the cast obtained from the preliminary impression. Border molding was done on the tray which was short from borders. On both trays, the final impression was made with zinc oxide eugenol impression paste. Heat cure denture bases were fabricated on the prepared casts and retention was measured using specially designed instrument.

Observations and results: Mean force with border molding (2765.0 g) was larger than mean force without border molding (1805.0 g) at P < 0.01 level. In terms of percentage, too, the mean improvement (59.4%) in force of dislodgement was statistically highly significant (i.e. P < 0.01).

Clinical significance: The results of the present study suggest that the dentures made with border molding will provide better retentive force than the dentures made without border molding.

Keywords: Border molding; peripheral seal; retention.

Figure 1

Preliminary maxillary impression

Figure 2

(a) Preliminary cast showing markings for the wax spacer and resin tray to be made for secondary impression with border molding. (b) Preliminary cast showing markings for wax spacer and resin tray to be made for secondary impression without border molding

Figure 3

(a) Resin tray 2 mm short from the sulcus. (b) Resin tray with full extensions to the sulcus

Figure 4

(a) Final impression of the patient with border molding. (b) Final impression of the patient without border molding

Figure 5

(a) Heat cure denture base made with border molding. A wire has been passed through the raised platforms for attachment to the retention testing device. (b) Heat cure denture base made without border molding. A wire has been passed through the raised platforms for attachment to the retention testing device

Figure 6

Patient with maxillary denture base in mouth for attachment to the retention testing device

Graph 1

Pattern of the force of dislodgement in respect of the two study groups

Graph 2

The relative performance of the two study groups