Abstract
A new method of maxillary block was devised improving ostwalt's method which has the highest rate of success in reaching to pterygopalatine fossa, while its rate in reaching to the canalis rotundus is low. Distance between the lowest point on the inferior margin of the orbit and the biting surface of the second false molar of the upper jaw was measured and this was suggested as the distance of needle insertion. The needle is inserted at the possible nearest point to the pterygopalatine fossa on the posterior margin of the tuber maxillae in the oral cavity. Then the point of the needle is inserted exactly into the pterygopalatine fossa using specially devised needle. Thus the maxillary nerve is reached and then the direction of the needle is changed after Matas-Braun's or Sicher's method which have the high rate in reaching canalis rotundus. Thereby, in foramen rotundum, the block of the maxillary branch of the trigeminal nerve is given whithout danger or difficulty.
