الفهرس | Only 14 pages are availabe for public view |
Abstract Our study was conducted to evaluate the sealing ability and retrievability of GuttaCore obturating material and comparing it with warm vertical compaction technique. Sealing ability was evaluated using dye penetration method (clearing method). Retrievability, with different solvents, was evaluated by measuring the percentage of remaining obturation material and the time required for retreatment process. The total number of samples (n=80) were classified into two main groups (I and II) (n=40) according to the obturation technique used. Each main group was subdivided into two subgroups according to evaluation method: Subgroup 1 (n=10) where sealing ability was evaluated and subgroup 2 (n=30) where retrievability of the filling material was evaluated. Subgroup 2 was further subdivided into three subdivisions (N, C & E) according to the solvent used during retreatment (no solvent, chloroform & eucalyptol). Samples were decoronated, prepared using Protaper universal files until F4 followed by apical refinement by K-file #45. Group I was obturated using GuttaCore obturators and group II was obturated using warm vertical compaction technique. Subgroup 1 was evaluated for sealing ability using dye penetration method. Samples were immersed in India ink for 7 days and then subjected to clearing process to measure the linear apical dye penetration. Obturation material of samples of subgroup 2 was removed using Protaper universal retreatment system followed by further canal instrumentation using F3 and F4 and final apical refinement using H-file #45. The removal was done either with no solvent, with chloroform, or with eucalyptol. Percentage of remaining obturation material was measured by vertical sectioning of the roots followed by image capturing by stereomicroscope and image analysis using imageJ software. The time required for retreatment was measured from the first retreatment file used until no obturation material can be distinguished on the last file. GuttaCore showed lesser mean of linear apical dye penetration than warm vertical compaction technique but with no statistically significant difference. GuttaCore left more remaining material apically (than coronal and middle thirds) in non solvent, chloroform, and eucalyptol groups. Non solvent group showed significantly the most percentage of remaining GuttaCore material in both middle and apical portions of the canal. Warm vertical compaction group left more remaining material apically (than coronal and middle thirds) in non solvent, chloroform, and eucalyptol groups. Non solvent group showed significantly the most percentage of remaining gutta-percha in both middle and apical portions of the canal. Eucalyptol group showed significantly the most remaining obturation material coronally. With no solvent, GuttaCore left significantly more remaining material than warm vertical compaction technique at the coronal portion of the canal. No statistically significant difference was found between the two groups at middle and apical portions. With chloroform, GuttaCore left significantly more remaining material than warm vertical compaction technique at coronal and apical portions. No statistically significant difference was found between the two groups at the middle portion. With eucalyptol, GuttaCore left significantly more remaining material than warm vertical compaction technique at the coronal portion. No statistically significant difference was found between the two groups at middle and apical portions. With no solvent, GuttaCore recorded significantly more time for retreatment than warm vertical compaction technique. With chloroform, the difference was not significant while with eucalyptol GuttaCore recorded significantly lesser time than warm vertical compaction technique. |