Restorative Dentistry & Endodontics

Bacterial leakage and micro-computed tomography evaluation in round-shaped canals obturated with bioceramic cone and sealer using matched single cone technique: Kallaya Yanpiset, Danuchit Banomyong, Kanet Chotvorrarak, Ratchapin Laovanitch Srisatjaluk; Restor Dent Endod 2018;43(3):e30. Published online July 5, 2018; DOI: https://doi.org/10.5395/rde.2018.43.e30

Abstract PDF PubReader ePub: Objectives
To evaluate sealing ability of root canals obturated with bioceramic-impregnated gutta percha cone (BCC) or gutta percha (GP), with bioceramic sealer (BCS) or AH Plus (AH; Dentsply-Maillefer), in roundly-prepared canals using matched single-cone technique, based on bacterial leakage test, and to analyze obturation quality using micro-computed tomography (CT) analysis.
Materials and Methods
Ninety-two distobuccal roots of maxillary molars were prepared using nickel-titanium files to apical size 40/0.06. The roots were divided into 4 groups (n = 20) that were obturated with a master cone and sealer: GP/AH, BCC/AH, GP/BCS, and BCC/BCS. Bacterial leakage model using Enterococcus faecalis was used to evaluate sealing ability for 60-day period. Obturated samples from each group (n = 4) were analyzed using micro-CT.
Results
All groups showed bacterial leakage at 20%–45% of samples with mean leakage times of 42–52 days. There were no significant differences in bacterial leakage among the groups. Micro-CT showed minimal gaps and voids in all groups at less than 1%.
Conclusions
In roundly-prepared canals, the single cone obturation with BCC/BCS was comparable to GP/AH for bacterial leakage at 60 days.

The effect of MTAD as a final root canal irrigants on the coronal bacterial leakage of obturated root canals: Tae Woo Kim, Seok Woo Chang, Dong Sung Park; J Korean Acad Conserv Dent 2008;33(4):397-404. Published online July 31, 2008; DOI: https://doi.org/10.5395/JKACD.2008.33.4.397

Abstract PDF PubReader ePub: The purpose of this study was to evaluate the effects of MTAD, EDTA and sodium hypochlorite(NaOCl) as final irrigants on coronal leakage resistance to Enterococcus faecalis. Forty extracted human maxillary molars were used in this experiment. The teeth were randomly divided into positive control group (Group 1; n = 5), negative control group (Group 2; n = 5) and three experimental groups (n = 30). In Group 3 (n = 10), the root canals were irrigated with sodium hypochlorite. In Group 4 (n = 10) and 5 (n = 10), the root canals were irrigated with sodium hypochlorite and rinsed with EDTA and MTAD, respectively. The teeth in each group were cleaned and shaped to #40 profile with .04 taper, and obturated with gutta-percha and AH-26 root canal sealer. The coronal portion of each tooth was placed in contact with inoculum of Enterococcus faecalis in Brain Heart Infusion (BHI) culture media. Each root tip was placed in a vial containing sterile culture media. The vials were placed in anaerobic chamber and observed everyday for turbidity for 180 days. Statistical analysis was performed using Fisher's Exact Test. After 180 days, Group 3, 4, and 5 showed 7, 4 and 5 leaking samples respectively. The differences in leakage resistance were not statistically significant among Group 3, 4 and 5.

Comparison of ultrasonic and sonic root end preparations using anaerobic bacterial leakage model: Nak-Yeon Cho, Dong-Sung Park, Hyeon-Mee Yoo, Tae-Seok Oh; J Korean Acad Conserv Dent 2002;27(5):530-534. Published online September 30, 2002; DOI: https://doi.org/10.5395/JKACD.2002.27.5.530

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