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Azerbaycan Saytlari

 »  Home  »  Endodontic Articles 4  »  A laboratory study of coronal microleakage using four temporary restorative materials
A laboratory study of coronal microleakage using four temporary restorative materials
Discussion - References.

Fermin, Caviton and Cavit are premixed temporary filling materials. This reduces mixing inconsistencies commonly encountered with chairside manipulation of cements. In addition, they set on contact with moisture and possess hygroscopic properties. This enables these materials to provide a tight seal in endodontic access cavities, thereby preventing seepage of bacteria, oral fluids and other debris into the pulp chamber, which is essential for the success of root canal treatment.
A number of methods have been used to evaluate the microleakage of temporary endodontic filling materials (Noguera & McDonald 1990, Hosoya 1991, Lee et al. 1993, Kazemi et al. 1994, Mayer & Eickholz 1997, Pai et al. 1999). The present study utilized thermal and/or load cycling procedures to simulate intraoral conditions. The temperature range of 55 2 C and 5 2 C that was used in this study corresponds to the extremes of temperatures that could be experienced in the oral environment (Noguera & McDonald 1990). The load applied on the samples in this study was in accordance with the findings of Ishikawa et al. (1995), who noted that the load of 1.3 kg seemed to be equivalent to the force exerted when masticating soft food and that the average chewing in humans is approximately 2000 times day −1 . Therefore, the load cycle used in this study is roughly equivalent to the total number of times that an individual would chew in a 17-day period. This is within the normal appointment interval of 7–21 days (Messer & Wilson 1996).
The results of this study indicated that maintaining the samples at 37 C (control group) or subjecting them to load cycling procedures (group C) did not produce any significantly increased microleakage. This differs from the findings of Ishikawa et al. (1995) after subjecting chemically cured posterior composite restorations to load cycling. These resin materials may take up to 7 days to polymerize and achieve optimum mechanical strength. Therefore, subjecting them to load cycling during the early stage of polymerization could potentially cause microleakage.
In groups where thermal cycling was applied, both groups of Canseal were found to have been severely affected, resulting in gap formation between the filling material and the tooth structure with subsequent leakage of the dye into the entirety of the pulp chamber (Fig. 3c). A similar finding was observed when IRM was tested for its sealing ability (Mayer & Eickholz 1997). This finding could probably be attributed to the instability of zinc oxide when subjected to extremes of temperatures (Windholz et al. 1976, Mayer & Eickholz 1997), as well as inconsistencies in the mixing process and the resulting lack of homogeneity (Deveaux et al. 1999).
Fermin, Caviton and Cavit, being hygroscopic materials that tend to absorb fluids, exhibited penetration of the dye into the filling material. A similar finding was noted in previous studies (Noguera & McDonald 1990, Lee et al. 1993, Pai et al. 1999). This was not observed in the case of Canseal. However, the instability demonstrated by Canseal when subjected to thermal cycling raises questions as to its ability to provide a tight seal and this suggests that its use as a temporary endodontic filling material requires re-evaluation.
Dye microleakage and penetration in all Fermin samples did not extend beyond the dentino-enamel junction. Caviton was observed to exhibit better sealing ability as compared with Cavit ( P < 0.0005) in conformity with the findings of others (Lee et al. 1993). However, no statistically significant difference was noted between Fermin and Caviton, suggesting that the quality of seal provided by these two materials is similar.


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