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Adhesively Cemented Endodontic Posts: A SEM Investigation

G. RAPPELLI (Universita di Ancona, Italy), C. MASSACCESI (Universita di Ancona, Italy),
A. CERUTTI (Università di Brescia, Italy), and A. PUTIGNANO (Universita di Ancona, Italy)


Objectives:
The aim of the present investigation is to quantitatively evaluate the presence of hybrid layer on the surface of two types of posts adhesively cemented into the canal with two different materials.

Methods:
48 extracted premolar were used for this study. After the endodontic treatment, samples have been randomly devised in four groups.
Group 1: Bonding system: Quadrant UniBond -(Cavex), luting material: Quadrant UniChem -(Cavex), post Tech2000-(Carbotech).
Group 2: Bonding system: Quadrant UniBond -(Cavex), luting material: Quadrant UniChem -(Cavex), post Zircopost-(OHC).
Group 3: Bonding and luting system: Quadrant UniFix Cement -(Cavex), post Zircopost-(OHC).
Group 4: Bonding and luting system: Quadrant UniFix Cement -(Cavex), post Tech2000-(Carbotech).

For each sample 30 % HCl solution was used to solve the dentin. SEM investigations were realised at three levels of the post (coronal, middle, apical), and four values for each level were taken. Hybrid layer was classified in four patterns depending on the density and the length of the resin tags. Data were statistically analyzed by Kruskall-Wallis test.

Results:
For each group the coronal level showed the best results. Goup 4 (carbon post luted with adhesive cement) gave the best represented hybrid layer. The difference among the experimental groups are statistically significant.

Conclusions:
This in vitro study highlights that the use of a self-curing adhesive cement associated to a carbon-fiber post is an effective technique in resorting pulpless teeth.