Influence of adhesive cementation systems on the bond strength of relined fiber posts to root dentin.
BACKGROUND
Glass fiber post cementation procedures have undergone significant development. Relining the post with composite resin is a technique that aims to reduce resin cement thickness and consequently problems inherent to polymerization. Evidence is sparse regarding the efficacy of bonding procedures at increasing depths (from cervical to apical) using different adhesive cementation techniques.


OBJECTIVE
The purpose of this in vitro study was to evaluate the push-out bond strength (PBS) of composite resin relined glass fiber posts cemented to bovine root dentin using different adhesive cementation protocols.


METHODS
Eighteen bovine teeth (n=6) were embedded in polystyrene resin blocks, and the crowns were sectioned leaving a root portion of 20 mm in length. Root canals were prepared using rotary instruments provided by the post manufacturer (Whitepost DC #1), resulting in a uniform root canal preparation. The root canals were lubricated with a water-soluble glycerin gel. Silane (Prosil) was applied and the posts relined with a microhybrid composite resin (Filtek Z100) to conform to the root canal anatomy. Three adhesive cementation protocols were evaluated: a 3-step etch-and-rinse adhesive system (Adper Scotchbond Multi Purpose) in combination with a dual polymerizing resin cement (RelyX ARC); a universal adhesive system (Scotchbond Universal) associated with a dual polymerizing resin cement (RelyX Ultimate); and a self-adhesive dual polymerizing resin cement (RelyX Unicem 2). The roots were sectioned, resulting in four 2-mm segments at 4 different depths (cervical to apical) and evaluated by the PBS test, using a universal testing machine (Instron 4411) at 0.5 mm/min, until failure. Interfaces were evaluated by scanning electron microscopy, and failures were classified as cohesive failure in composite resin, cohesive failure in cement, cohesive failure in root dentin, adhesive failure, or mixed. Data were analyzed by 2-way split-plot ANOVA and the Tukey post hoc test (α=.05).


RESULTS
No statistical differences were found for PBS when different cementation systems were compared (P=.253). Increased depths resulted in reduced PBS values for all cementation protocols evaluated (P<.001).


CONCLUSIONS
Regardless the cementation system used, the lowest PBS values were at the apical region of resin relined glass fiber posts bonded to root dentin. Furthermore, the highest PBS is observed at the cervical portion of root dentin.
Doctoral student, Department of Restorative Dentistry, State University of Campinas, Piracicaba Dental School, Piracicaba, Brazil.
Raquel Viana
RV
Rodrigues
Research Professor, Department of Biomaterials, Universidad de Los Andes, Santiago, Chile; and Doctoral student, Department of Restorative Dentistry, State University of Campinas, Piracicaba Dental School, Piracicaba, Brazil. Electronic address: csampaio@miuandes.cl.
Camila Sobral
CS
Sampaio
Assistant Professor, Restorative Dentistry Department, University of Detroit Mercy, School of Dentistry, Detroit, Mich; and Doctoral student, Department of Restorative Dentistry, State University of Campinas, Piracicaba Dental School, Piracicaba, Brazil.
Rafael Rocha
RR
Pacheco
Associate Professor, Department of Pediatric Dentistry, State University of Campinas, Piracicaba Dental School, Piracicaba, Brazil.
Fernanda Miori
FM
Pascon
Full Professor, Department of Pediatric Dentistry, State University of Campinas, Piracicaba Dental School, Piracicaba, Brazil.
Regina Maria
RM
Puppin-Rontani
Associate Professor, Department of Restorative Dentistry, State University of Campinas, Piracicaba Dental School, Piracicaba, Brazil.
Marcelo
M
Giannini
D000818:Animals; D002417:Cattle; D017005:Dental Debonding; D003804:Dentin; D017220:Dentin-Bonding Agents; D005898:Glass; D066298:In Vitro Techniques; D008422:Materials Testing; D019279:Resin Cements; D014092:Tooth Root
D017220:Dentin-Bonding Agents; D019279:Resin Cements; C009753:fiberglass; C095998:Adhesive cement