J Adv Prosthodont.  2013 Aug;5(3):278-286. 10.4047/jap.2013.5.3.278.

Push-out bond strengths of fiber-reinforced composite posts with various resin cements according to the root level

• Chang HS
• Noh YS
• Lee Y
• Min KS
• Bae JM

• KMID: 2118167
• DOI: http://doi.org/10.4047/jap.2013.5.3.278

Abstract

PURPOSE
The aim of this study was to determine whether the push-out bond strengths between the radicular dentin and fiber reinforced-composite (FRC) posts with various resin cements decreased or not, according to the coronal, middle or apical level of the root.
MATERIALS AND METHODS
FRC posts were cemented with one of five resin cement groups (RelyX Unicem: Uni, Contax with activator & LuxaCore-Dual: LuA, Contax & LuxaCore-Dual: Lu, Panavia F 2.0: PA, Super-Bond C&B: SB) into extracted human mandibular premolars. The roots were sliced into discs at the coronal, middle and apical levels. Push-out bond strength tests were performed with a universal testing machine at a crosshead speed of 0.5 mm/min, and the failure aspect was analyzed.
RESULTS
There were no significant differences (P>.05) in the bond strengths of the different resin cements at the coronal level, but there were significant differences in the bond strengths at the middle and apical levels (P<.05). Only the Uni and LuA cements did not show any significant decrease in their bond strengths at all the root levels (P>.05); all other groups had a significant decrease in bond strength at the middle or apical level (P<.05). The failure aspect was dominantly cohesive at the coronal level of all resin cements (P<.05), whereas it was dominantly adhesive at the apical level.
CONCLUSION
All resin cement groups showed decreases in bond strengths at the middle or apical level except LuA and Uni.

Keyword

Fiber reinforced-composite post; Resin cements; Bond strength; Root level

MeSH Terms

Adhesives
Bicuspid
Boron Compounds
Collodion
Composite Resins
Dental Cements
Dentin
Humans
Methacrylates
Methylmethacrylates
Resin Cements
Adhesives
Boron Compounds
Collodion
Composite Resins
Dental Cements
Methacrylates
Methylmethacrylates
Resin Cements

Figure

• 

  Fig. 1 The cemented post in a tooth embedded in acrylic resin. The end of post was fixed into precisely fitted hole using an aluminum base (p: post, t: tooth, m: aluminum mold, b: aluminum base, h: fitting hole).

• 

  Fig. 2 The FRC post luted with resin cement inside the root canal was embedded in acrylic resin and sectioned at 1 mm thickness producing 3 specimens from the coronal (a), middle (b), and apical areas (c), respectively. At least 3 mm of gutta-percha was left to maintain the apical seal (t: tooth, r: acrylic resin).

• 

  Fig. 3 Assembly of the push-out bond strength test. (A) photograph of the assembly installed on a universal testing machine, (B) a magnified schematic diagram of the circled area of (A) (p: post, t: tooth, r: acrylic resin, h: hole for the post being pushed-out on loading).

• 

  Fig. 4 Representative SEM failure images shown at ×30 maginfication: (A) adhesive failure between dentin and cement at the apical level of PA, (B) adhesive failure between post and cement at the middle level of SB, (C) adhesive failure between post and cement and cohesive failure within cement at the middle level of Uni; the circled area is shown at ×300 in the upper left corner, (D) cohesive failure within post, cement and tooth at the coronal level of LuA (Δ: failure, p: post, c: cement, t: tooth).

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