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KMID : 0980320150150030113
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Journal of Dental Anesthesia and Pain Medicine
2015 Volume.15 No. 3 p.113 ~ p.119
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The influence of mandibular skeletal characteristics on inferior alveolar nerve block anesthesia
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You Tae-Min
Kim Kee-Deog
Huh Ji-Sun
Woo Eun-Jung
Park Won-Se
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Abstract
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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.
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KEYWORD
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Condyle-coronoid ratio, Inferior alveolar nerve block, Skeletal characteristics
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