Abstract
Background and aims. Inferior alveolar nerve block injection is one of the common intra oral anesthetic techniques,
with a failure rate of 15-20%. The aim of this study was to evaluate the position of the lingula as an index for this injection.
Materials and methods. Thirty eight panoramic radiographs of 7–11 year old patients were analyzed and the distance
between the lingula index and occlusal plane was measured. Then, lower alveolar nerve block injection was performed on
88 children. Finally, a visual analogue scale was used to measure the rate of pain in the patients.
Results. This distance increased with age and in children younger than nine years is −0.45 mm on the right side and −0.95
mm on the left side. This distance in children older than 9 years is −0.23 mm on the right side and 0.47 mm on the left side.
The success rates of inferior alveolar nerve block injection based on lingual index were 49% on the right side and 53.8% on
the left side.
Conclusion. As the lingual index has various positions and its distance from the occlusal plane increases with age, it is
not an appropriate landmark for inferior alveolar nerve block injection.