•Purpose: To compare the flare up rate in one-visit versus two-visit endodontic treatment.
•N= 402 consecutive patients
- Only pulpally necrotic and first and second molars without detectable sinus tracts were considered.
- Endodontic treatment was performed with step-back filing to at least a #30 diameter. During instrumentation, RC Prep and 0.5% NaOCl were used.
- Metacresylacetate an intracanal medication with two-visit therapy.
- The patient served as his own control when the same individual qualified in both treatment groups.
- Antibiotic treatment was often ordered if exudate was present.
Most highlighted Results:
1.8% flare-ups occurred in the two-visit group versus 3% flare-ups for the one-visit group.
2.No significant differences regarding age, gender, maxillary or mandibular molar, and first or second molar. No significant differences arose regarding antibiotic use.
3.In a second comparison, one-visit patients who had previously received two-visit treatment for a different pulpally necrotic molar served as their own control. No significant differences were present in this subgroup of 17 patients.
A higher chance of flare up in 2 visit treatment than single visit.