The Effect of Light-curing Access and Different Resin Cements on Apical Bond Strength of Fiber Posts

Abstract

B Daleprane C Nemesio de Barros Pereira RL Oréfice AC Bueno RR Vaz AN Moreira CS Magalhã es Clinical RelevanceCementation of fiber glass posts with self-adhesive cement (RelyX U100) is more predictable than cementation with resin cement using a three-step etch-and-rinse adhesive system (RelyX ARC/SBMP) as its bond strength to apical dentin was not influenced by the level of light-curing access. SUMMARYPurpose: This study evaluated the effect of light-curing access on the bond strength of fiber glass posts to the apical area of bovine roots using self-adhesive cement or dual-cured cement with an etch-and-rinse adhesive system.Materials and Methods: The root canals of 60 bovine teeth were endodontically treated and filled. A 15-mm-length post space was prepared and roots were randomly divided into three groups, simulating the levels of light-curing access: coronal (C), with 15-mm post space; middle (M), in which the coronal thirds of roots were cut out, leaving a 10-mm post space; and apical (A), in which the coronal and middle thirds of roots were cut out, leaving a 5-mm post space. Fiber glass posts (Reforpost # 3, Angelus) were cemented with RelyX U100 (3M ESPE) or RelyX ARC/Scotchbond Multi Purpose Plus (SBMP) (3M ESPE) (n=10) and lightcured. After 24 hours, the apical thirds of roots were sectioned perpendicularly to the long axis and submitted to a push-out test (0.5 mm/

Comparison of Resin Cement Insertion Techniques for Luting Fiberglass Posts

“…The bond strength of cement/post/dentin interface can be influenced by resin cement flowability, cement distribution in coronal, middle, and apical thirds of the root, the anatomy of the canal, and the orientation of the dentinal tubules [5,13,[20][21][22][23]. In the present study, there was no significant difference in the bond strength between the Centrix syringe or Lentulo drill technique, corroborating the findings of previous studies [14,[17][18][19].…”

“…Thus, bovine teeth were used as alternative substrate for the tests and it has been reported in the literature [5,12,17,22,24].…”

“…They do not require etching of the post space dentine or the use of adhesive systems [2][3][4]. The bond strength of self-adhesive cements appears to be superior to that of conventional cements, and does not vary according to the depth of the canal [5].…”

Effect of Photoactivation Timing on the Mechanical Properties of Resin Cements and Bond Strength of Fiberglass Post to Root Dentin

“…12,42 This may have limited the polymerization of the resin cements in the middle and apical root thirds, 20,43,44 resulting in lower push-out bond strength, 7,12, E, and VHN values in these regions, 12 mainly for Rely X ARC and Panavia F when compared with the self-adhesive resin cement RelyX Unicem. 44 Push-out bond strength and mean VHN measured in the coronal and middle thirds were higher than those measured in the apical third. 40 Thus, the luting of fiber posts with increased lengths should be treated with caution, mainly when the fiber post is cemented with RelyX ARC.…”

“…40 Thus, the luting of fiber posts with increased lengths should be treated with caution, mainly when the fiber post is cemented with RelyX ARC. 44 The limitation of polymerization in the deeper region of a root canal is reflected in a fracture resistance and structure deformation similar to that of root-treated teeth restored with shorter (5.0 or 7.5 mm) or longer (10.0 mm) posts. 4,46 The delayed photoactivation timings increased VHN and E values for self-adhesive resin cement (RelyX Unicem) but not for conventional resin cements (Panavia F and RelyX ARC).…”