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The association of local anaesthetic (LA) with hyaluronidase (H) is widely used in ophthalmic anesthesia in order to improve its effectiveness of anesthesia. In dentistry, H 150 UTR/ mL injected concomitantly to LA solution did not enhance the success rate of anesthesia in inferior alveolar nerve (IAN) block and increased postoperative trismus. Recent studies have proved that when a concentration of 75UTR/ mL was injected 40 minutes after the beginning of the anesthesia in IAN block and lasts the local anesthesia. The purposes of this study were to evaluate the influence of H (75UTR/ mL) in onset time of action (OA), duration of LA action (DA), success rate, trismus and edema after surgical extractions of mandibular thrid molars. In each surgery was injected 1.8ml of 2% lidocaine with epinephrine added to hyaluronidase or placebo (vehicle) in a double blinded method, in 25 healthy patients for bilateral and symmetrical third inferior molar surgeries. The OA and DA were evaluated by electrical stimulus (pulpal anesthesia) in the inferior premolar and by mechanical stimulus (pick) for gingival anaesthesia. Trismus was determined by measuring maximum interincisal opening. Facial swelling was assessed by a tape measuring method (distance between points on the face) at second and seventh postoperative days. There were no significant difference between the H and placebo solutions in OA, DA, success rate, trismus and edema (p>0.01). Trismus and edema were significant diferent in the second day postoperative (p<0.01) for H and placebo. H added to LA did not influence sucess rate of LA, OA and DA, trismus and edema postoperative. The concomitant use of LA to H in the concentration of 75 UTR/ mL does not seem advantageous in IAN block.

Hialuronidase associada à lidocaína com epinefrina em bloqueio pterigomandibular: avaliação da latência, duração e índice de sucesso anestésico, edema facial e abertura bucal