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The Effect of Maxillary First Molar Root Length on the Success Rate of Buccal Infiltration Anesthesia

Published:August 10, 2016DOI:https://doi.org/10.1016/j.joen.2016.07.005

      Abstract

      Introduction

      Several variables may influence anesthesia success in maxillary molars. This investigation was conducted to evaluate the effect of root length on the success rate of infiltration injections of 2% lidocaine with 1:80,000 epinephrine.

      Methods

      One hundred maxillary first molars with irreversible pulpitis were treated. After the administration of a buccal infiltration injection of 2% lidocaine with 1:80,000 epinephrine, the patients' pain during dentin cutting, pulp exposure, and root canal instrumentation were evaluated using the Heft-Parker visual analog scale. No or mild pain was considered as success. Data were analyzed by the point-biserial correlation test and receiver operating characteristic curve analysis.

      Results

      Overall, 61% of the teeth had successful anesthesia after the administration of a single buccal infiltration injection of anesthetic solution. The point-biserial correlation test showed that the teeth that had palatal and distobuccal roots with longer root lengths showed significantly higher anesthesia failure (P < .05). However, receiver operating characteristic curve analysis did not show a clinically useful cutoff point of root length corresponding with anesthesia failure.

      Conclusions

      Maxillary first molars having irreversible pulpitis with longer roots may have more anesthesia failures after a single buccal infiltration injection with 2% lidocaine and 1:80000 epinephrine.

      Key Words

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