Cements influence on the seating depth of glass fiber-reinforced posts

Resin cements are recommended for the adhesive cementation of glass fiber reinforced posts. However, different resin cements have different filler size and viscosity, which may influence the ability to properly seat the post. Little information is available regarding the effect of the resin cement used on the seating ability of glass fiber reinforced posts Objectives: The purpose of this study was to evaluate the influence of different post designs and resin luting cements on the seating depth of a glass fiber-reinforced post system. Methods: 40 acrylic blocks were prepared for 11 mm long post spaces using the compatible drills of a tapered (ParaPost Taper Lux, Coltène/Whaledent; n=20) and a parallel post system (ParaPost Fiber Lux, Coltène/Whaledent; n=20). In each group, ten posts were cemented using the luting cement ParaCore (Coltène/Whaledent) and another ten posts using Panavia F2.0 (Kuraray). For cementation, the samples were placed in a custom seating device under a load of 2.2 kg. After light curing, the samples were cut longitudinally. Cut surfaces were digitally photographed and the apical distance from the post to the acrylic floor was measured using image analysis software (Image tool 3.0, UTHSCSA). Statistical analysis was performed using Kruskal-Wallis and Mann-Whitney tests at a=.05. Results: Luting cements did not influence the seating depth of tapered posts but the seating depth for parallel posts cemented with Panavia F2.0 was significantly different (<.05) from all other groups.

	Parallel post	Tapered post
ParaCore	0.12±0.24 mm	0.079±0.16 mm
Panavia F2.0	0.78±0.73 mmA	0.098±0.21 mm

(Superscript letters indicate significance)

Conclusions: Tapered posts can be cemented using either ParaCore or Panavia F2.0. However, parallel posts should not be cemented with Panavia F2.0.