title: Influence of endodontic sealer composition and time of fiber post cementation on sealer adhesiveness to bovine root dentin.
abstract: This study aimed to assess the influence of the type of endodontic sealer (salicylate resin-based sealer vs. two endodontic sealers) and the time of fiber post cementation after root filling on the post adhesion to bovine root dentin. Sixty bovine roots were assigned to six groups (n=10), considering an experimental design with two factors (factorial 3x2): endodontic sealer factor in three levels [epoxy resin-based sealer (AH Plus), eugenol-based sealer (Endofill), and salicylate resin-based sealer plus mineral trioxide aggregate - MTA (MTA Fillapex)] and time for post cementation factor in two levels (immediate post cementation or 15 days after root canal filling). After post cementation, 2-mm-thick slices were produced and submitted to push-out test. The failure modes were analyzed under a 40× stereomicroscope and scored as: adhesive at cement/dentin interface; adhesive at cement/post interface; cement cohesive; post cohesive; dentin cohesive; or mixed. Data were analyzed using two-way ANOVA and Tukey's post-hoc tests (α=0.05). When the fiber posts were cemented immediately after the root canal filling, the bond strengths were similar, independent of the endodontic sealer type. However, after 15 days, the epoxy resin-based sealer presented higher bond strength than the other sealers (p<0.05). Comparison between each sealer in different experimental times did not reveal any differences. The main failure type was adhesive at dentin/cement interface (89.4%). The time elapsed between the root canal filling and post cementation has no influence on post/root dentin adhesion. On the contrary, the type of endodontic sealer can influence the adhesion between fiber posts and root dentin.
authors: Department of Conservative Dentistry, Endodontic Area, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil. rabreudarosa@yahoo.com.br
authors: Ricardo Abreu da
authors: RA
authors: Rosa
authors: Mirela Sangoi
authors: MS
authors: Barreto
authors: Rafael do Amaral
authors: Rdo A
authors: Moraes
authors: Juliana
authors: J
authors: Broch
authors: Carlos Alexandre Souza
authors: CA
authors: Bier
authors: Marcus Vinícius Reis
authors: MV
authors: Só
authors: Osvaldo Bazzan
authors: OB
authors: Kaizer
authors: Luiz Felipe
authors: LF
authors: Valandro
mesh_terms: D017607:Aluminum Compounds / Q000737:chemistry; D000818:Animals; D017610:Calcium Compounds / Q000737:chemistry; D002417:Cattle; D002484:Cementation / Q000379:methods*; D001840:Dental Bonding; D003786:Dental Pulp Cavity / Q000648:ultrastructure*; D003804:Dentin / Q000648:ultrastructure*; D004338:Drug Combinations; D004853:Epoxy Resins / Q000737:chemistry; D005899:Glass Ionomer Cements / Q000737:chemistry; D008422:Materials Testing; D010087:Oxides / Q000737:chemistry; D011176:Post and Core Technique / Q000295:instrumentation*; D011897:Random Allocation; D012387:Root Canal Filling Materials / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry; D013314:Stress, Mechanical; D013499:Surface Properties; D013997:Time Factors; D015035:Zinc Oxide-Eugenol Cement / Q000737:chemistry
chemical_list: D017607:Aluminum Compounds; D017610:Calcium Compounds; D004338:Drug Combinations; D004853:Epoxy Resins; D005899:Glass Ionomer Cements; D010087:Oxides; D012387:Root Canal Filling Materials; D017640:Silicates; D015035:Zinc Oxide-Eugenol Cement; C534916:epoxy resin-based root canal sealer; C086631:mineral trioxide aggregate; C074417:Endo-Fill