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Azerbaycan Saytlari

 »  Home  »  Endodontic Articles 3  »  The long-term sealing ability of an epoxy resin root canal sealer used with five gutta percha obturation techniques
The long-term sealing ability of an epoxy resin root canal sealer used with five gutta percha obturation techniques
Discussion - References.

In order to evaluate the sealing ability of root fillings, several in vitro methods have been designed. It is important to appreciate that not only is the apical seal of the root canal of importance, but the coronal seal is of equal importance for the success of treatment (Saunders & Saunders 1994a). The most common method used to assess leakage remains the measurement of dye penetration (Wu & Wesselink 1993). The results of dye penetration studies, however, are confusing and often result in variable conclusions (Wu & Wesselink 1993, Dalat & Spångberg 1994). This lack of agreement has been discussed by Wu & Wesselink (1993), who questioned the validity of leakage studies and recommended that more research should be devoted to leakage study methodology. The nature and the amount of leakage observed with this technique cannot be extrapolated to an in vivo situation. On the other hand, laboratory testing remains the only valuable preclinical screening test that can predict or indicate clinical performance (De Moor & Martens 1999).
Longitudinal sectioning of roots and the linear measurement of dye penetration were used in the present study for the measurement of leakage. On the one hand, it is clear that this experimental model cannot mimic the in vivo situation. On the other hand, it enables the observation of dye penetration and whether or not that is associated with porosities in the gutta-percha, the presence of empty spaces, stripping of the gutta-percha from the solid core system or changes in the structure of thermoplasticized gutta-percha. Splitting the root longitudinally combined with dye penetration also enables the demonstration of the pattern of dye penetration.
One of the aims of the present investigation was to verify the findings of a previous study (De Moor & De Boever 2000). In the present study and in our previous fourmonth study (De Moor & De Boever 2000) obturation with Soft-Core obturators resulted in greater leakage scores with higher standard deviations when compared with the other filling techniques. This may indicate that Soft-Core obturators are ineffective in the apical obturation of well-instrumented straight root canals under ideal conditions. In addition, it was also seen that apical leakage increased with time up to 4 months in all five obturation techniques. These findings were in general agreement with those of others (Gurney et al . 1971), in which leakage increased during the five-month evaluation period. Other studies on long-term apical sealing ability as a function of time and of the filling techniques investigated in the present study do not appear to have been published.

Table 3. Group means, standard deviations, and minimum and maximum extent of apical dye penetration in mm.

apical dye penetration
Table 4. Group means, standard deviations, and minimum and maximum extent of coronal dye penetration in mm.

coronal dye penetration

The results regarding coronal leakage revealed no statistically significant differences between the three non-carrier systems and between the two carrier systems. This lack of a significant effect was not surprising, given that a similar procedure was used to seal the orifices of the specimens.
In our previous study (De Moor & De Boever 2000) it was found that the preheated gutta-percha of the Soft- Cores appeared to be porous when viewed under the microscope. Despite previously reported data in favour of the use of AH26 in combination with the gutta-percha coated system Thermafil (Dalat & Spångberg 1994), the presence of porosities in the gutta-percha of the Soft-Core obturators might explain the greater amounts of apical leakage found in the present and in our previous studies (De Moor & Martens 1999, De Moor & De Boever 2000). These porosities did not appear to be of importance when scoring the amount of coronal dye leakage.


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