Występowanie bólu po obturacji kanału korzeniowego w trakcie leczenia endodontycznego prowadzonego podczas jednej wizyty lub kilku wizyt
Clinical procedure
Three dentists from HKU and three dentists from PKU formed three pairs of dentists with similar clinical experience, to carry out the endodontic treatments. One dentist from each pair was trained to use the magnifying loupe (2.5×). All six dentists performed standardised endodontic treatments, which were done over either a single visit or multiple visits, and the obturations were performed with either CLC or TF. Receptionists randomly assigned patients to the dentists for treatment using the random-number generating function of a calculator. The dentists received a training workshop prior to this clinical trial to standardise their instrumentation and obturation technique, as described below. Local anaesthetic was given, and a rubber dam was used for isolation. The access cavity was prepared with a glide path before the use of rotary instruments. The root canals were prepared using a crown-down technique, which prepares the coronal part of the canal before the apical portion to achieve a straight-lined access for rotary nickel-titanium endodontic files (ProTaper Universal, Dentsply Maillefer, Ballaigues, Switzerland). Sodium hypochlorite solution at 5.25 % combined with a chelating agent of 17 % EDTA solution was used for irrigation. EDTA 15 % lubricant (RC-Prep, Premier, Philadelphia, USA) was used in the shaping procedures [13].
The working length was measured by an electronic apex locator (Root ZX, J Morita, Kyoto, Japan). The apical third of the canals was instrumented with F2 file with a diameter [...]
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