Endodontology
Online only article
Effects of different irrigation regimens on the sealing properties of repaired furcal perforations

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Objective

The pulp chamber is inevitably exposed to irrigants during endodontic therapy. This study aimed to investigate whether different irrigation regimens would alter the sealing ability of repaired furcal perforations.

Study design

Pulp chambers of 90 extracted human molars were accessed, after which standardized diamond bur-cut perforations were created in the center of the pulp chamber floor. The canal orifices and the apical end of roots were sealed with acid-etch composite resin. Eighty teeth were randomly divided into 2 groups (n = 40/group) according to the material used for repairing the perforation defects: (1) Mineral trioxide aggregate (MTA), (2) Super-EBA. The remaining teeth (n = 10) served as controls. The specimens were further subgrouped according to the irrigation regimens applied over the repair site (n = 10/group): (a) 5.25% NaOCl, (b) 5.25% NaOCl + EDTA, (c) 5.25% NaOCl + MTAD, and (d) No irrigation. Coronal leakage was measured by the fluid-filtration method at 1 day and 1 week.

Results

Fluid conductance was not affected by the type of repair material (P = .964) or time (P = .726), but was affected significantly by the irrigation regimens in the following ranking: (P < .001): NaOCl ≤ No Irrigation < NaOCl + MTAD ≤ NaOCl + EDTA.

Conclusion

The sealing ability of furcal perforations repaired with MTA or Super-EBA were differentially affected by exposure to the tested irrigation regimens.

Section snippets

Specimen preparation

Tri-rooted, freshly extracted human first molars (n = 90) were stored in an aqueous solution of 0.5% chloramine-T at 4°C before use (a maximum of 1 month). The absence of root caries and fractures were confirmed under magnification before storage.

Endodontic access cavities were prepared with high-speed diamond burs under coolant water spray. The contents of the pulp chamber and root canals were removed with a spoon excavator and barbed broaches, respectively. To facilitate manipulation, half

Results

The fluid conductance values are presented in Fig. 2 as mean ± standard deviation. The tested repair materials and time had no significant effect on overall leakage values (P = .964 and P = .726, respectively).

Fluid conductance was significantly affected by the tested irrigation regimens (P < .001). Accordingly, groups b and c (NaOCl + MTAD and NaOCl + EDTA) demonstrated similar fluid conductance values that were significantly higher than those of groups a (NaOCl only) and d (No treatment) (P <

Discussion

The fluid transport model permits a nondestructive, quantitative measurement of microleakage around coronal restorations and endodontic retrograde fillings over a longitudinal time period.19, 20 The sensitivity of the fluid transport model can be adjusted by altering the pressure. In the present study, microleakage assessment was conducted under a pressure of 20 cm H2O, which corresponds to the physiologic pressure that exists in the marrow spaces of alveolar bone.21, 22 Owing to the direct

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