Post-Operative Pain and Associated Factors in Patients Undergoing Single Visit Root Canal Treatment on Teeth with Vital Pulp

Background Pain after root canal therapy is unwanted yet common experience for the patient and unpleasant for the dentist so it is always desirable to predict such pain. Objective To evaluate the frequency, intensity and associated factors of post-operative pain after single visit endodontic therapy on teeth with vital pulps. Method A total of 418 single visit root canal treatments were performed on patients of age 18 years and above by two endodontists. Canals were shaped with rotary ProTaper files. After the canal preparation, the canals were obturated, using lateral compaction technique, with ProTaper universal gutta-percha and AH-Plus sealer. Independent factors were recorded during the treatment and characteristics of postoperative pain were later surveyed through questionnaires. The severity of pain was recorded on a visual analogue scale (VAS) of 0-5. The data were analyzed using logistic regression models. Result The prevalence of post-operative pain within first six hours after treatment was high (79.2%) which decreased to 22% at the end of 72 hours however majority (70%) of the patients had mild to moderate pain (VAS 1-2). The factors that significantly influenced post-obturation pain experience were: gender (OR=0.55, 95%CI=0.32- 0.93; p=0.03), tooth type (OR-0.67; 95% CI=10.56-0.81, p=0.00), history of preoperative pain (OR=1.26; 95% CI= 1.04-1.51; p=0.02) and number of canals (OR=2.03; 95% CI=1.40-2.95; p=0.00). Conclusion The prevalence of some level of post -operative pain after single visit root canal therapy was high and was significantly influenced by female gender, increased number of canals, posterior tooth type and positive history of pre-operative pain.

Mechanism Investigation of Rifampicin-Induced Liver Injury Using Comparative Toxicoproteomics in Mice

Tuberculosis is one of the top causes of death among curable infectious diseases; it is an airborne infectious disease that killed 1.1 million people worldwide in 2010. Anti-tuberculosis drug-induced liver injury is the primary cause of drug-induced liver injury (DILI). Rifampicin is one of the most common anti-tuberculosis therapies and has well-known hepatotoxicity. To understand the mechanism of rifampicin-induced liver injury, we performed a global proteomic analysis of liver proteins by LC-MS/MS in a mouse model after the oral administration of 177 and 442.5 mg/kg rifampicin (LD10 and LD25) for 14 days. Based on the biochemical parameters in the plasma after rifampicin treatment, the hepatotoxic effect of rifampicin in the mouse liver was defined as a mixed liver injury. In the present study, we identified 1101 proteins and quantified 1038 proteins. A total of 29 and 40 proteins were up-regulated and 27 and 118 proteins were down-regulated in response to 177 and 442.5 mg/kg rifampicin, respectively. Furthermore, we performed Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analyses to characterize the mechanism of rifampicin-induced hepatotoxicity. In the molecular function category, glutathione transferase activity was up-regulated and proteins related to arachidonic acid metabolism were down-regulated. In the KEGG pathway enrichment-based clustering analysis, the peroxisome proliferator-activated receptor-γ (PPARγ) signaling pathway, cytochrome P450, glutathione metabolism, chemical carcinogenesis, and related proteins increased dose-dependently in rifampicin-treated livers. Taken together, this study showed in-depth molecular mechanism of rifampicin-induced liver injury by comparative toxicoproteomics approach.