The influence of mandibular skeletal characteristics on inferior alveolar nerve block anesthesia
Tae Min You ; Kee-Deog Kim ; Wonse Park ; Eun-Jung Woo ; Jisun Huh
Journal of Dental Anesthesia and Pain Medicine, Vol.15(3) : 113~119, 2015
Journal of Dental Anesthesia and Pain Medicine
Background: The inferior alveolar nerve block (IANB) is the most common anesthetic techniques in dentistry; however, its success rate is low. The purpose of this study was to determine the correlation between IANB
failure and mandibular skeletal characteristics
Methods: In total, 693 cases of lower third molar extraction (n = 575 patients) were examined in this study.
The ratio of the condylar and coronoid distances from the mandibular foramen (condyle-coronoid ratio [CC
ratio]) was calculated, and the mandibular skeleton was then classified as normal, retrognathic, or prognathic.
The correlation between IANB failure and sex, treatment side, and the CC ratio was assessed.
Results: The IANB failure rates for normal, retrognathic, and prognathic mandibles were 7.3%, 14.5%, and
9.5%, respectively, and the failure rate was highest among those with a CC ratio < 0.8 (severe retrognathic
mandible). The failure rate was significantly higher in the retrognathic group than in normal group (P = 0.019),
and there was no statistically significant difference between the other two groups.
Conclusions: IANB failure could be attributable, in part, to the skeletal characteristics of the mandible. In
addition, the failure rate was found to be significantly higher in the retrognathic group.