Dichtigkeitsuntersuchung von Wurzelfüllungen anhand einer quantitativen Glucose-Penetrations-Methode

Clinical backround: Leakage of a root canal filling is an important factor for the success of a root canal treatment. Aim: Evaluation of leakage of different root canal fillings and – techniques with the glucose penetration model. Material & Method: 110 human incisors were preparated using rotary tech-nique up to ISO 40 and divided in 5 experimental groups. Each group contained 20 teeth and 2 controlgroups contained 5 teeth. Pos. controlgr.: No root canal filling; Neg. controlgr.: Root canal filling and completely coated teeth with sticky wax; Gr. Guttaflow: Guttaflow using single-cone-technique; Gr. Gutta lat.: Guttapercha and AH plus using lateral compaction; Gr. RealSeal lat.: RealSeal-System using lateral compaction; Gr. Gutta vert.: Guttapercha and AH plus using vertical compaction; Gr. RealSeal vert.: RealSeal-System using vertical compaction. Glucose concentration in the penetration model was measured at the 1st, 2nd, 4th, 7th, 10th, 15th, 20th and 30th day by means of a glucose-oxidase-method. Statistics: Examination on normal distribution, box plots, test on significance. Results: Because more than 50% of the results of the measuring days 1, 2 and 4 were located below the proof border, they were not considered. All test groups showed significant differences comparing the glucose-concentrations depending on the measuring days in each case between 7th and 15th measuring day, between the 10th and 20th measuring day as well as between the 15th and 30th measuring day. Compared to the golden standard (guttapercha using lateral compaction) following results were ascertained: a) Root canal fillings with guttaflow using the single-cone-technique showed no significant differences in the glucose concentration on all measuring days. b) Significantly higher glucose concentrations were registered in root canal fillings with RealSeal using lateral as well as vertical compaction on all measuring days whereas the test group RealSeal applied in lateral compaction reached the highest overall glucose concentrations. c) On the measuring days 7, 15, and 20 no significant differences were detected in root canal fillings with Guttapercha using vertical compaction and on the measuring days 10 and 30 significantly higher glucose concentrations were established. Conclusion: Root canal fillings with RealSeal were significantly inferior to the golden standard concerning the leakage. Root canal fillings with Guttaflow or with Guttapercha using vertical compaction showed a good sealing behaviour like the golden standard. No root canal filling could guarantee a long-term her-metic sealing.