J Korean Acad Conserv Dent.  2010 Nov;35(6):479-485. 10.5395/JKACD.2010.35.6.479.

Comparison of push-out bond strength of post according to cement application methods

• Kim SR
• Yum J
• Park JK
• Hur B
• Kim HC

• KMID: 2176470
• DOI: http://doi.org/10.5395/JKACD.2010.35.6.479

Abstract

OBJECTIVES
The aim of this study was to compare the push-out bond strengths of resin cement/fiber post systems to post space dentin using different application methods of resin cement.
MATERIALS AND METHODS
Thirty extracted human premolars were selected and randomly divided into 3 groups according to the technique used to place the cement into root canal: using lentulo-spiral instrument (group Lentulo), applying the cement onto the post surface (group Direct), and injecting the material using a specific elongation tip (group Elongation tip). After shaping and filling of the root canal, post space was drilled using Rely-X post drill. Rely-X fiber post was seated using Rely-X Unicem and resin cement was light polymerized. The root specimens were embedded in an acrylic resin and the specimens were sectioned perpendicularly to the long axis using a low-speed saw. Three slices per each root containing cross-sections of coronal, middle and apical part of the bonded fiber posts were obtained by sectioning. The push-out bond strength was measured using Universal Testing Machine. Specimens after bond failure were examined using operating microscope to evaluate the failure modes.
RESULTS
Push-out bond strengths were statistically influenced by the root regions. Group using the elongation tip showed significantly higher bond strength than other ways. Most failures occurred at the cement/dentin interface or in a mixed mode.
CONCLUSIONS
The use of an elongation tip seems to reduce the number of imperfections within the self-adhesive cement interface compared to the techniques such as direct applying with the post and lentulo-spiral technique.

Keyword

Elongation tip; Post; Push-out bond strength; Resin cement

MeSH Terms

Axis, Cervical Vertebra
Bicuspid
Collodion
Dental Pulp Cavity
Dentin
Humans
Hypogonadism
Light
Mandrillus
Mitochondrial Diseases
Ophthalmoplegia
Polymers
Resin Cements
Collodion
Hypogonadism
Mitochondrial Diseases
Ophthalmoplegia
Polymers
Resin Cements

Figure

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  Figure 1 Rely-X post drill and Rely-X fiber post (left), Rely-X Unicem with an elongation tip is ready to inject into the canal (right).

• 

  Figure 2 Experimental design and preparation of specimens low-speed saw was used to prepare 3 sections through luted post specimen, each 2 mm thick (left). Push-out bond strength testing was performed using universal testing machine (right).

• 

  Figure 3 Bonding area of post/cement interface was measured using formula of conical frustum: top (R) and bottom radius (r) of post along with height of specimen (h): total bonding area = π(R + r)[(h2 + (R - r)2]0.5

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