Influence of Premedication and Dental Anxiety on Anesthetic Efficacy in Patients Undergoing Root Canal for Symptomatic Irreversible Pulpitis in Upper and Lower Molars: A Comparative Study of Articaine and Bupivacaine

The use of local anesthetics in dentistry is crucial for pain control. Their efficacy may be related to multiple factors, including gender, the clinical status of the patient, anatomical factors, the type of anesthetic, premedication treatment, and the experience of the professional. <b>Aim:</b> The objective of this study was to analyze whether premedication or the degree of patient anxiety influences the anesthetic efficacy of 4% articaine with epinephrine 1:100,000 and 0.5% bupivacaine with epinephrine 1:100,000 in patients undergoing root canal treatment for symptomatic irreversible pulpitis in the upper and lower molars. The null hypothesis (H0) of this study was that articaine and bupivacaine would have a similar anesthetic efficacy when used during the treatment of symptomatic irreversible pulpitis of the posterior mandibular and maxillary teeth, independent of non-steroidal anti-inflammatory drugs (NSAIDs) premedication or the patient's anxiety levels. <b>Methods:</b> A total of 140 patients presenting with pulpitis in the upper and lower molars were randomly assigned to one of two anesthetics: articaine or bupivacaine. Before root canal treatment, patients completed the Modified Corah Dental Anxiety Scale (MDAS) and a Visual Analog Scale (VAS) for pain intensity. Inferior alveolar nerve block was performed for the lower molars and buccal infiltration for the upper molars, and the anesthetic efficacy was verified by the Endo Coldspray^® test. During the procedure, the patients' heart rate and oxygen saturation were monitored using a pulse oximeter. The patients reported their pain levels using a VAS twenty-four hours postoperatively. <b>Results:</b> High levels of dental anxiety were significantly associated with higher pain scores (<i>p</i> = 0.000) for both groups. The hemodynamic changes during treatment remained within normal limits. The need for anesthetic reinforcement was higher in the bupivacaine group (<i>p</i> = 0.004). The patients in both groups reported low-intensity postoperative pain, although the pain level was slightly lower in the bupivacaine group. <b>Conclusions:</b> The anesthetic efficacy of articaine and bupivacaine in patients with irreversible pulpitis did not appear to be influenced by the degree of anxiety or the intake of AINEs as premedication. The intrinsic anesthetic efficacy was higher for articaine, which required less reinforcement than bupivacaine. Comparing the results obtained when performing buccal infiltration and inferior alveolar nerve block further highlighted the differences between the two anesthetics; these differences were more pronounced in the bupivacaine group, leading to rejection of the null hypothesis proposed at the beginning of the study.