Abstract
Objective: This study evaluated the effect of rootperforations on the bond strength of fiberglassposts cemented to the root canal with two adhesivesystems and resin cement. Material and Methods:Forty single-rooted human teeth received endodontictreatment and were prepared for the cementationof fiberglass posts (Exacto Mini, Angelus). Theteeth were divided into four experimental groups(n = 10) according to the root condition (with orwithout perforation) and the adhesive system used:G1: without perforation + Adper Single Bond 2(3M ESPE), G2: without perforation + Clearfil SEBond (Kuraray), G3: with perforation + AdperSingle Bond 2, G4: with perforation + Clearfil SEBond. The perforation was executed on the rootsurface with a diamond bur and sealed with whitemineral trioxide aggregate (MTA). The specimenswere sectioned and a push-out test was carriedout (1 mm/min speed and 50 kgf). The data werestatistically analyzed by ANOVA and Tukey Test(5%). Results: Adper Single Bond 2 promoted thegreatest values of bond strength to the roots withoutroot perforation. The presence of root perforation ledto the reduction in bond strength values regardlessof the bonding system used (p < 0.05). Conclusion:The root perforations caused a direct effect on thebond strength of the fiberglass posts cemented byreducing the bond strength values to the root dentinregardless of the adhesive system used.KeywordsAdhesion; Cementation; Dental adhesives; Dental cements; Fiberglass pins.
Highlights
Root perforations are operative accidents that may occur during either endodontic treatment and retreatment or intraradicular prosthetic preparation leading to the communication between root canal and periodontal ligament
When the dental structure loss is very significant after the root perforation sealing and endodontic treatment, the use of intraradicular posts is mandatory
The presence of root perforation resulted in the reduction of the bond strength vales regardless of the adhesive system used
Summary
Root perforations are operative accidents that may occur during either endodontic treatment and retreatment or intraradicular prosthetic preparation leading to the communication between root canal and periodontal ligament. The most conservative treatment for these cases has been the perforation sealing with proper materials. When the dental structure loss is very significant after the root perforation sealing and endodontic treatment, the use of intraradicular posts is mandatory. Prefabricated intraradicular fiberglass posts have a modulus of elasticity similar to that of dentin, allowing the absorption and a more uniform distribution of the tensions over the root remnant. Their use results in a more conservative adhesive restorative procedure, decreases the risk of root fracture and increases the retention of the filler material [3]. The adhesive cementation of fiberglass posts has been indicated
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