Influence of Various Luting Materials on Retention of Fixed Partial Denture

Evaluation by Using Fixed Partial Denture Model Having Mandibular Third Molar as Abutment Tooth

Abstract

The laboratory fixed partial denture models, made from Ni-Cr alloy or Au-Ag-Pd alloy, were used to measure the retentive force of one retainer (full cast crown) luted on the abutment before and after thermal cycling and to evaluate the retentivity and durability of various luting materials.Three types of conventional luting materials and two adhesive resins, 4 META-MMA/TBB resin and phosphate ester composite resin, were used.
The retentive forces with adhesive resin, glass ionomer, polycarboxylate and zinc phosphatecements were 57.3-74.0, 26.3-30.6, 17.9-20.2 and 11.3-19.5 kgf respectively after 24-hour immersion in 37°C water (thermal cycle 0). There was no significant difference in the retentive force between Ni-Cr and Au-Ag-Pd alloy in all luting materials except phosphate ester composite resin. The retentive force with 4 METAMMA/TBB resin was significantly decreased by the thermal cycle test up to 50, 000 cycles, while those with other luting materials were hardly affected by thermal cycling.