Abstract
Local anesthesia is an integral part of dentistry, which is mandatory before operative dental procedures. But it may itself cause pain at the time of needle prick and delivery of anesthetic solution. Computer controlled Local anesthesia delivery (CCLAD) systems like Dentapen®, Wand® STA, SleeperOne® are multi-speed, electronic injection device that adapts to a technique for controlled anesthetic injections for painless anesthesia. The device offers better comfort to patients by minimizing pain and elimination of fear of injection. The system helps the dentists to avoid muscle strain caused by repeated manual injections. It has some certain advantages like automatic priming at onset of device and auto-aspiration to locate the accurate injection site; thus obliterates the chances of hematoma formation and trismus. The CCLAD systems continuously monitor the pressure applied at the injection site to avoid over pressure which is inherent to manual injection which causes pain. They adapt the injection flow accordingly up to the optimum measurement of anesthetic dose which is processed by advanced control algorithms in order to deliver a smooth injection flow. CCLADs are especially suited for pediatric dentistry. The different modes and speeds allow the injection almost unnoticeable and nonthreatening which eliminates the apprehension of the patient, those are usually phobic to conventional injection prick.