Comparative study of two needle models in terms of deflection duringinferior alveolar nerve block

ABSTRACT

Objectives: The purpose of this study is to determine the possible differences in deflection between two needlesof same length and external gauge but with different internal gauges during truncal block of the inferior alveolarnerve. The initial working hypothesis was that greater deflection may be expected with larger internal gaugeneedles.Study design: Four clinicians subjected 346 patients to inferior alveolar nerve block and infiltrating anesthesia ofthe buccal nerve trajectory for the surgical or conventional extraction of the lower third molar. A nonautoaspiratingsyringe system with 2 types of needle was used a standard 27-gauge x 35-mm needle with an internal gaugeof 0.215 mm or an XL Monoprotect® 27-gauge x 35-mm needle with an internal gauge of 0.265 mm. The followinginformation was systematically recorded for each patient needle type, gender, anesthetic technique (director indirect truncal block) and the number of bone contacts during the procedure, the patient-extraction side, thepractitioner performing the technique, and blood aspiration (either positive or negative).Results: 346 needles were used in total. 190 were standard needles (27-gauge x 35-mm needle with an internalgauge of 0.215 mm) and 156 were XL Monoprotect®. Incidence of deflection was observed in 49.1% of cases (170needles) where 94 were standard needles and 76 XL Monoprotect®. Needle torsion ranged from 0º and 6º.Conclusions: No significant differences were recorded in terms of deflection and internal gauge, operator, patientextractionside, the anesthetic technique involved and the number of bone contacts during the procedure (AU)

RESUMEN

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