Lead Author Affiliation

DDS

Lead Author Status

Faculty/Staff/Researcher

Presentation Category

Research

Introduction/Context/Diagnosis

The aim of this study is to evaluate the shear forces when pulling a cemented fiber post from a root canal of a human tooth using self-curing cement systems with either a chemically-curing (cc) or light-curing (lc) mode bonding system or no extra adhesive system at all.

Methods/Treatment Plan

A total of 60 maxillary and mandibulary canines were used in this study. The crowns were cut of perpendicularly to the long axis and at the most coronal portion of the proximal DEJ. The canines were individually embedded in acrylic resin exposing the coronal flat surface of the cut root using a mold. The dimension of the round specimens was 2.5cm in diameter and 2cm in height.

Each specimen underwent the same post space treatment using a miniature drill press with digital depth finder. The UniCore (Ultradent) post drills were pressed slowly into the canal space to create a 5mm space in length. For each specimen three bur sizes were used consecutively: white (Ø0.6mm), yellow (Ø 0.8) and red (Ø 1mm). The size 2/red fiber post (UniCore, Ultradent) was cemented with different cementation and bonding protocols.

Results/Outcome

Method I Clearfil Universal Bond (lc) with Clearfil DC Core Plus (cc) [Kuraray Noritake Dental] showed highest average shear forces as well as highest individual pull out forces. The mean value was statistically significant different (p<0.05) than group B,D,E,G and J.

Groups

Method A

Method B

Method C

Method D

Method E

Method F

Method G

Method H

Method I

Method J

Mean (stdev)

13 (±2.7)

3.6 (±2.6)

16.1 (±2.8)

10.8 (±2.4)

10.7 (±2.0)

10.6 (±10.4)

4.2 (±2.7)

16.8 (±3.0)

18.5 (±6.3)

8.0 (±7.2)

Significant difference

B,G,H

A,C,D,E,H,I

B,D,G,J

B,D,G,H,I

B,G,H,I

A,C,D,E,H,I

A,B,D,E,G,J

B,D,E,G,J

C,H,

It was followed by groups H,C and A. Methods I and A were cemented in conjunction with a light curing adhesive system. The results are shown in the graph and the significant differences are shown in the table.

Significance/Conclusions

High bond strength was achieved with light curing adhesives in the root canal as well as with chemically curing adhesives . The cement without bonding or priming procedure showed the lowest bond strength.

Format

Event

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FIBER POST PULL OUT TESTS USING DIFFERENT CEMENTATION AND BONDING METHODS

The aim of this study is to evaluate the shear forces when pulling a cemented fiber post from a root canal of a human tooth using self-curing cement systems with either a chemically-curing (cc) or light-curing (lc) mode bonding system or no extra adhesive system at all.