Effect of different rotary instrumentation techniques and thermoplastic filling on apical sealing

Abstract

he aim of this study was to evaluate apical sealing after root canal treatment using two different rotary instrumentation techniques and two thermoplastic root canal filling techniques. The study was performed in 115 human extracted mandibular premolars. After coronary access the apical foramen was opened with a # 15 K file 1 mm beyond the apex. Cleaning and shaping was subsequently carried out at the working length, 1 mm from the apex, with ProFile .04/.06 system (Dentsply/Maillefer), Quantec (Analytic Endodontics/Kerr) or by the step-back technique with 1% sodium hypochlorite solution as irrigating solution. The root canals were filled with Thermafil (Dentsply/ Maillefer) or Microseal (Analytic Endodontics/Kerr) or by lateral condensation technique using AH Plus sealer (epoxy type). The teeth were immersed in 2% methylene blue under vacuum. Then, they were longitudinally sectioned. The results showed that the association of Profile and Thermafil Plus provide the best results (p<0.05). In conclusion, the association of different rotary instrumentation techniques and different filling systems influenced the apical sealing.

Effect of thermoplastic filling techniques on the push-out strength of root sealing materials

“…The quality of root canal fillings is generally evaluated using two-dimensional radiographs, 19 leakage models, 1,5 and cross-sectional methods. 3,12 These techniques enable visualization of the distribution of root filling materials, such as gutta-percha and sealer, inside the canal.…”

“…1,2,3,4 According to De-Deus et al 5 and Gulsahi et al, 6 the material should completely fill the root canal, and the ideal outcome is a high volume of core material, generally gutta-percha, and a small quantity of sealer, to prevent growth of residual bacteria and inhibit introduction of new bacteria.…”

“…However, the efficiency of the technique mainly depends on the type of sealer used. 1 Therefore, thermoplastic canal filling methods are indicated to allow condensation of warm gutta-percha in all the root canal irregularities. 9 Moreover, these techniques allow correction of failures during the filling process without requiring complete removal of material.…”

“…9 Moreover, these techniques allow correction of failures during the filling process without requiring complete removal of material. 1,3,12 The MicroSeal (AnalyticEndodontics/Kerr, Orange, USA) is a thermomechanical filling technique that comprises placement of a laterally compacted master gutta-percha cone and additional gutta-percha to backfill the canal. Modifications of this technique have been proposed to enable filling of root canals with complex anatomy.…”

Filling of simulated lateral canals with gutta percha or resilon when using thermomechanical compaction

“…[10] Thermomechanical compaction is a technique introduced by Mc Spadden and modified by Tagger et al . [11] In this technique, thermomechanical compactors are used to promote heat and plasticize the gutta-percha, while exerting apical and lateral pressure.…”