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International Poster Journal of Dentistry and Oral Medicine
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Int Poster J Dent Oral Med 12 (2010), No. 1     15. Mar. 2010

Int Poster J Dent Oral Med 2010, Vol 12 No 1, Poster 483

Bond Strength of Resin Cements on Different Root Dentin Localizations

Language: English
 

Authors:
Claudia Rettig, DDS, Anja Rother, DDS, Prof. Dr. Hans-Guenter Schaller, PD Dr.Christian Ralf Gernhardt,
Department of Operative Dentistry and Periodontology, Martin-Luther-University Halle-Wittenberg

Date/Event/Venue:
April 1st-4th, 2009
87th Annual Meeting & Exhibition of the IADR
Miami, Florida, USA
 

Introduction

Fiber posts, in combination with resin cements, have been widely used to restore endodontically treated teeth. Variations in the structure of the root canal dentin such as accessory root canals, areas of resorption, embedded and free pulp stones, and varying amounts of irregular secondary dentin may affect bond strength to root canal dentin (1). The evaluation of dentin morphology in root canals in terms of tubule orientation and density reveals a higher tubule density in the cervical compared with the central and apical parts of the root canal (2). The regional effect of dentin on the retention of resin cements is controversally discussed and remains uncertain (3, 4).
 

Objectives

The aim of this study was to compare microtensile bond strength of a self-etching resin cement (Bifix SE, Voco, Germany) with an established resin cement system (Bifix, Futurabond DC, Voco, Germany) on different root canal dentin localizations (coronal, cervical and apical) in vitro (Figure 1, 2).

Fig. 1: Special designed apparatus to test microtensile bond strength Fig. 2: Experimental device mounted in an universal testing machine (Zwick 005)
 
Fig. 3: Specimen preparation (apical, cervical, coronal)

Material and Methods

In this study 90 single rooted extracted teeth, stored in saline for a maximum of thirty days after extraction were used. All teeth were specially prepared allowing the evaluation of microtensile bond strength on root canal dentin (Figure 3). The specimens were randomly assigned to six experimental groups of fifteen samples each: Group 1: Bifix/ coronal dentin; group 2: Bifix/ cervical dentin; group 3: Bifix/ apical dentin; group 4: Bifix SE/ coronal dentin; group 5: Bifix SE/ cervical dentin; group 6: Bifix SE/ apical dentin (Figure 4, 5). Microtensile bond strength was measured 15 minutes after application using an universal testing machine (Z005, Zwick) (Figure 1, 2). All materials were applied as recommended by the manufacturer and light-cured for 60 seconds. Statistical analysis was performed using SPSS 15.0. The data of mTBS were analysed by one-way anova a. Post hoc pair-wise comparisons were performed using Tukey multiple comparisons. For each outcome, level of significance was set at 5%.

Fig. 4, 5: Resin Cements tested in this study (Futurabond DC, Bifix SE)
 
Fig. 6: Graphically expression of the results
 
 

Results

For the six test series microtensile bond strengths as shown in table 1 and graphically expressed in figure 6 were evaluated (mean value and standard deviation in Mpa):
Regarding both resin cements, Bifix SE showed singnificantly higher bond strengths on coronal and cervical dentin (p<0.05, Tukey's Test). Focusing on the different localizations, significant lower bond strengths values could only be detected on apical root canal dentin after the use of Bifix SE. In all other groups no significant influence of the localization could evaluated.

Group 1 2 3 4 5 6
Material Bifix / futurabond DC Bifix SE
Localization Coronal Cervical Apical Coronal Cervical Apical
bond Strength 34.7 30.1 30.9 42.8 37.0 30.4
± 3.0 2.7 3.2 3.6 2.8 2.9
Tab. 1: Mean value and standard deviation (in Mpa) within the different experimental groups
 

Conclusions

Within the limitations of an in vitro investigation it can be concluded that the new self-etching resin cement showed promising results compared to an established resin cement system regardless of the root dentin localization.
 

Literature

  1. Mjör IA, Smith MR, Ferrari M, Mannocci F (2001) The structure of dentine in the apical region of human teeth. International Endodontic Journal 34, 346-53.
  2. Ferrari M, Mannocci F, Vichi A, Cagidiaco MC, Mjo¨r IA (2000) Bonding to root canal: structural characteristics of the substrate. American Journal of Dentistry 13, 255-60.
  3. Goracci C, Tavares AU, Monticelli F et al. (2004) The adhesion between fiber posts and root canal walls: comparison between microtensile and push-out bond strengths measurements. European Journal of Oral Science 112, 353-61.
  4. Gaston BA, West LA, Liewehr FR, Fernandes C, Pashley DH (2001) Evaluation of regional bond strength of resin cement to endodontic surfaces. Journal of Endodontics 27, 321-4.
     

Abbreviations

MPa= Megapascals
 

This Poster was submitted by PD Dr. Christian R. Gernhardt.
 

Correspondence address:
PD Dr. Christian R. Gernhardt
Martin-Luther-University Halle-Wittenberg
University School of Dental Medicine, Department of Operative Dentistry and Periodontology
Grosse Steinstrase 19
06108 Halle/Saale
Germany