Abstract
he objective of this study was to investigate the effect of various luting cement systems on bond strength of fibre-reinforced posts to root canal dentine. 40 extracted single rooted sound premolar teeth were root filled, decoronated and randomly divided into four groups. Fibre posts, Aestheti- Plus™ (Bisco,Inc. Schaumburg, IL, USA) were cemented using four luting cements: Group A (control): Elite 100® Zinc phosphate (GC Corp, Japan), Group B: Calibra ™ Esthetic Resin Cement (Dentsply Caulk, USA), Group C: RelyX ARC Adhesive Resin (3M ESPE), Group D: RelyX Unicem Aplicap (3M ESPE). Each root was sliced into 2 discs representing the coronal and middle portions of the root canal giving rise to 20 specimens per group. Bond strength was determined using push-out tests and data was analyzed using SPSS version 14.0. The mean bond strength of Group A to Aestheti-Plus™ post was 7.71 MPa (±2.51) and Group B was 5.69 MPa (±3.23). Group C exhibited the lowest mean bond strength, 4.29 MPa (±3.53) while the highest bond strength was obtained from Group D, 7.98 MPa (±2.61). One way ANOVA showed significant interaction between all groups (p=.OOI). Post-hoc Bonferroni test reve;iled that bond strength of Group C was significantly lower compared to Group A (p=.008) and D (p=.004). In conclusion, the mean bond strength of Aestheti- Plus™ post to root canal dentine was highest when cemented with RelyX Unicem resin cement followed by Elite 100® zinc phosphate cement, Calibra and RelyX ARC resin cements. However, the bond strengths of Cali bra and RelyX Unicem resin cements were not significantly different from Elite 100® zinc phosphate cement.
Highlights
Endodontic posts have been shown to improve the retention of foundation core restorations for endodontically treated teeth which have significant loss of coronal tooth structure
The master cone was coated with cement and inserted to the working length, a finger spreader (Kerr) was inserted into the canal about 1 mm back from the working length, and lateral compaction was performed with non-standardized gutta-percha cones until the canal was obturated
RelyX ARC exhibited the lowest mean bond strength, 4.29 MPa (±3.53) and RelyX Unicem showed the highest bond strength compared to the other groups, 7.98 MPa (±2.61) as illustrated in Table 2 and Figure 7
Summary
Endodontic posts have been shown to improve the retention of foundation core restorations for endodontically treated teeth which have significant loss of coronal tooth structure. Corresponding author: Dr Noor Azlin Yahya endodontically-treated teeth reconstructed with posts are due to cementation failure of the posts; with root fractures being the most serious type of failure [24]. Corrosive reactions with prefabricated posts made from certain metal alloys can cause complications involving the surrounding tissues and oral environment, including metallic taste, oral burning, sensitization, oral pain and other reactions [6, 7]. Various tooth-coloured posts such as fibrereinforced posts are available and provide some advantages when restoring endodontically-treated teeth [8,9]
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