A Comparative Study of Coronal Microleakage of MTA and Gutta-percha in Short Roots Prepared for Post by Bacterial Penetration Technique

AA. Khademi, N. Shekarchizadeh Efahani

Abstract


Statement of Problems: Minimum length of the root end filling material and pulling out of gutta-percha during post space preparation is one of the complications of post insertion in the short root teeth.Purpose: The aim of this study was to investigate the coronal leakage of Enterococcus Faecalis in the short root teeth filled with Gutta-Percha and Mineral trioxide aggregate plug.Materials and Method: In this in vitro study, 40 single-root extracted teeth with a root length of 13 mm were selected. Due to the shortnes of the root, 3 mm was considered for canal filling material and 10 mm for the required post space. In order to prepare the canal, filing was done to size 50, using step back technique. No 2, 3 and 4 Gates Glidden was used for post space preparation.The teeth were divided into two experimental groups (Gutta-Percha, MTA) randomly. Fifteen teeth were filled with Gutta-Percha and AH26 sealer using lateral compaction, and then post space was prepared immediately so that only 3mm of Gutta-Percha remained in the apical part. The other 15 teeth were filled with 3mm MTA plug. Then, 10 teeth were used in the positive and negative control groups. In the positive control group, the teeth were filled with master cone without sealer and in the negative control group, the teeth were filled with Gutta-Percha and AH26 sealer using lateral compaction. The working length was 13mm and the coronal parts of the roots were sealed with stick wax. After the setting time of the filling material, Enterococcus Faecalis was injected into the canals and the teeth were kept in this environment for 120 days. Then, the time of turbidity of each specimen was recorded. Finally, the data were analyzed using Fisher Exact test.Results: In the Gutta-Percha group, all the specimens showed leakage during days 12-35. In the MTA group, leakage was observed in only four specimens during day 74-113. The positive control group showed leakage in all the specimens during 2 days. None of the specimens in the negative control group leaked. There was a statistically significant difference between Gitta-percha and MTA groups ( p < 0.001).Conclusion: Based on the results of this study, the sealing ability of MTA is better than Gutta-Percha as an ortograde root filling material prepared for post insertion in the teeth with minimum length of root.Key words: Coronal leakage, Post, Gutta-Percha, MTA

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pISSN: 2345-6485                        eISSN: 2345-6418