Güta-perka` nın yumuşatılmasında kloforma alternatif olabileceği düşünülen bazı solüsyonların etkinliklerinin in vitro koşullarda değerlendirilmesi

Abstract

64 SUMMARY The purpose of this study was to compare the efficiencies of various gutta percha solvents during endodontic retreatment. The solvents evaluated were chloroform, methyl chloroform, halothane and eucalyptol. In this study, 65 sound upper incisors and canines which were extracted for the periodontal reasons were used. The teeth were stored in 10% formalin solution until use. The root canals of the teeth were cleaned and shaped by step- back method and filled with lateral condensation technique, using AH26 as sealer. After the access cavities were filled temporarily, the teeth were stored in physiological saline solution at 37°C for 3 weeks. 60 teeth, from the total of 65 were divided into 4 subgroups each containing 15 teeth. The remaining 5 teeth were used as control. After the temporary filling materials were removed, the coronal 2 mm of canals were enlarged with Gates-Glidden burs and two drops of solvent was placed in the canals. When gutta-percha was softened, it was removed by the help of H-files. This procedure was repeatedly performed all through the entire working length. Reinstrumentation was carried on until there was no further evidence of gutta percha remained on the instrument. The crowns of the teeth were removed and the roots were splitted into two halves longitudinally in the vestibulopalatinal direction. The root halves were photographed and the images on the photos were copied onto tracing paper. The remaining gutta-percha and canal outlines were traced. The canal area and remaining gutta-percha area in the coronal, middle and apical thirds were measured using Image Analizer.65 The results were statistically analyzed by analysis of One-way variance, Kruskal-Wallis and Mann-Whitney U tests. No significant difference overall among the 4 experimental groups (4 solvents) were found in the area of remaining gutta percha (p>0.05). However, chloroform was found to be more efficient in the apical third when compared with eucalyptol. The results of this study suggest that eucalyptol, which was also found to be an efficient solvent in this study and does not have risks on human health as others do, seems to be the best choice to be used in retreatment procedures.

64 SUMMARY The purpose of this study was to compare the efficiencies of various gutta percha solvents during endodontic retreatment. The solvents evaluated were chloroform, methyl chloroform, halothane and eucalyptol. In this study, 65 sound upper incisors and canines which were extracted for the periodontal reasons were used. The teeth were stored in 10% formalin solution until use. The root canals of the teeth were cleaned and shaped by step- back method and filled with lateral condensation technique, using AH26 as sealer. After the access cavities were filled temporarily, the teeth were stored in physiological saline solution at 37°C for 3 weeks. 60 teeth, from the total of 65 were divided into 4 subgroups each containing 15 teeth. The remaining 5 teeth were used as control. After the temporary filling materials were removed, the coronal 2 mm of canals were enlarged with Gates-Glidden burs and two drops of solvent was placed in the canals. When gutta-percha was softened, it was removed by the help of H-files. This procedure was repeatedly performed all through the entire working length. Reinstrumentation was carried on until there was no further evidence of gutta percha remained on the instrument. The crowns of the teeth were removed and the roots were splitted into two halves longitudinally in the vestibulopalatinal direction. The root halves were photographed and the images on the photos were copied onto tracing paper. The remaining gutta-percha and canal outlines were traced. The canal area and remaining gutta-percha area in the coronal, middle and apical thirds were measured using Image Analizer.65 The results were statistically analyzed by analysis of One-way variance, Kruskal-Wallis and Mann-Whitney U tests. No significant difference overall among the 4 experimental groups (4 solvents) were found in the area of remaining gutta percha (p>0.05). However, chloroform was found to be more efficient in the apical third when compared with eucalyptol. The results of this study suggest that eucalyptol, which was also found to be an efficient solvent in this study and does not have risks on human health as others do, seems to be the best choice to be used in retreatment procedures.